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ISL85403FRZ

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ISL85403FRZ

For Reference Only

Part Number ISL85403FRZ
Manufacturer Renesas Electronics America
Description IC REG MULT CONFG ADJ 2.5A 20QFN
Datasheet ISL85403FRZ Datasheet
Package 20-VFQFN Exposed Pad
In Stock 463 piece(s)
Unit Price $ 2.4734 *
Lead Time Can Ship Immediately
Estimated Delivery Time Oct 29 - Nov 3 (Choose Expedited Shipping)
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Part Number # ISL85403FRZ (PMIC - Voltage Regulators - DC DC Switching Regulators) is manufactured by Renesas Electronics America and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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ISL85403FRZ Specifications

ManufacturerRenesas Electronics America
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Regulators
Datasheet ISL85403FRZDatasheet
Package20-VFQFN Exposed Pad
Series-
FunctionStep-Up, Step-Down, Step-Up/Step-Down
Output ConfigurationPositive
TopologyBuck, Boost, Buck-Boost
Output TypeAdjustable
Number of Outputs1
Voltage - Input (Min)3V
Voltage - Input (Max)40V
Voltage - Output (Min/Fixed)0.5V
Voltage - Output (Max)36V
Current - Output2.5A
Frequency - Switching200kHz ~ 2.2MHz
Synchronous RectifierBoth
Operating Temperature-40°C ~ 105°C (TA)
Mounting TypeSurface Mount
Package / Case20-VFQFN Exposed Pad
Supplier Device Package20-QFN (4x4)

ISL85403FRZ Datasheet

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FN8631 Rev 1.00 March 13, 2015 ISL85403 2.5A Regulator with Integrated High-side MOSFET for Synchronous Buck or Boost Buck Converter DATASHEETThe ISL85403 is a 40V, 2.5A synchronous buck or boost buck controller with a high-side MOSFET and low-side driver integrated. In buck mode, the ISL85403 supports a wide input range of 3V to 40V. In boost-buck mode, the input range can be extended down to 2.5V and output regulation can be maintained when VIN drops below VOUT, enabling sensitive electronics to remain on in low input voltage conditions. The ISL85403 has a flexible selection of operation modes of forced PWM mode and PFM mode. In PFM mode, the quiescent input current is as low as 180µA (AUXVCC connected to VOUT). The load boundary between PFM and PWM can be programmed to cover wide applications. The low-side driver can be either used to drive an external low-side MOSFET for a synchronous buck or left unused for a standard non-synchronous buck. The low-side driver can also be used to drive a boost converter as a preregulator followed by a buck controlled by the same IC, which greatly expands the operating input voltage range down to 2.5V or lower (Refer to “Typical Application Schematic III - Boost Buck Converter” on page 6). The ISL85403 offers the most robust current protections. It uses peak current mode control with cycle-by-cycle current limiting. It is implemented with frequency foldback under current limit condition; also, the hiccup overcurrent mode is also implemented to guarantee reliable operations under harsh short conditions. The ISL85403 has comprehensive protections against various faults including overvoltage and over-temperature protections, etc. Related Literature • AN1960, “ISL85403DEMO1Z Demonstration Board User Guide” • UG010, “ISL85403EVAL2Z Evaluation Board User Guide” Features • Buck mode: input voltage range 3V to 40V (refer to “Input Voltage” on page 15 for more details) • Boost mode expands operating input voltage lower than 2.5V (refer to “Input Voltage” on page 15 for more details) • Selectable forced PWM mode or PFM mode • 300µA IC quiescent current (PFM, no load); 180µA input quiescent current (PFM, no load, VOUT tied to AUXVCC) • Less than 5µA (MAX) shutdown input current (IC disabled) • Operational topologies - Synchronous buck - Non-synchronous buck - Two-stage boost buck - Non-inverting single inductor buck boost • Programmable frequency from 200kHz to 2.2MHz and frequency synchronization capability • ±1% tight voltage regulation accuracy • Reliable overcurrent protection - Temperature compensated current sense - Cycle-by-cycle current limiting with frequency foldback - Hiccup mode for worst case short condition • 20 Ld 4x4 QFN package • Pb-free (RoHS compliant) Applications • General purpose • 24V bus power • Battery power • Point-of-load • Embedded processor and I/O supplies FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE, VOUT 5V, TA = +25°C VOUTISL85403VCC SGND MODE BOOT VIN PHASE PGND FS EXT_BOOST EN FB COMP VIN AUXVCC LGATE ILIMIT SS SYNC PGOOD ISL85403 50 55 60 65 70 75 80 85 90 95 100 0.1m 1m 10m 100m 1.0 2.5 E F F IC IE N C Y ( % ) LOAD CURRENT (A) 6V VIN 12V VIN 24V VIN 36V VINFN8631 Rev 1.00 Page 1 of 24 March 13, 2015

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ISL85403Table of Contents Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Functional Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical Application Schematic I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical Application Schematic II - VCC Switchover to VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical Application Schematic III - Boost Buck Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 PWM Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 PFM Mode Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Synchronous and Non-Synchronous Buck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 AUXVCC Switchover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2-Stage Boost Buck Converter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Oscillator and Synchronization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 PGOOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Fault Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Thermal Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Component Selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Output Capacitors - Buck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Input Capacitors - Buck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Output Inductor - Buck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Low-side Power MOSFET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Output Voltage Feedback Resistor Divider. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Boost Inductor (2-Stage Boost Buck) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Boost Output Capacitor (2-Stage Boost Buck) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Loop Compensation Design - Buck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 PWM Comparator Gain Fm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Current Sampling Transfer Function He(S). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Power Stage Transfer Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Loop Compensation Design for 2-Stage Boost Buck and Single-stage Buck Boost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Layout Suggestions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24FN8631 Rev 1.00 Page 2 of 24 March 13, 2015

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ISL85403Pin Configuration ISL85403 (20 LD QFN) TOP VIEW Functional Pin Descriptions PIN NAME PIN # DESCRIPTION EN 1 The controller is enabled when this pin is left floating or pulled HIGH. The IC is disabled when this pin is pulled LOW. Range: 0V to 5.5V. FS 2 Connecting this pin to VCC, or GND, or leaving it open will force the IC to have 500kHz switching frequency. The oscillator switching frequency can also be programmed by adjusting the resistor from this pin to GND. SS 3 Connect a capacitor from this pin to ground. This capacitor, along with an internal 5µA current source, sets the soft-start interval of the converter. Also, this pin can be used to track a ramp on this pin. FB 4 This pin is the inverting input of the voltage feedback error amplifier. With a properly selected resistor divider connected from VOUT to FB, the output voltage can be set to any voltage between the power rail (reduced by maximum duty cycle and voltage drop) and the 0.8V reference. Loop compensation is achieved by connecting an RC network across COMP and FB. The FB pin is also monitored for overvoltage events. COMP 5 Output of the voltage feedback error amplifier. ILIMIT 6 Programmable current limit pin. With this pin connected to the VCC pin, or to GND, or left open, the current limiting threshold is set to default of 3.6A; the current limiting threshold can be programmed with a resistor from this pin to GND. MODE 7 Mode selection pin. Pull this pin to GND for forced PWM mode; to have it floating or connected to VCC will enable PFM mode when the peak inductor current is below the default threshold of 700mA. The current boundary threshold between PFM and PWM can also be programmed with a resistor at this pin to ground. Check for more details in the “PFM Mode Operation” on page 14. PGOOD 8 PGOOD is an open-drain output and pull-up pin with a resistor to VCC for proper function. PGOOD will be pulled low under the events when the output is out of regulation (OV or UV) or EN pin is pulled low. PGOOD rising has a fixed 128 cycles delay. PHASE 9, 10 These pins are the PHASE nodes that should be connected to the output inductor. These pins are connected to the source of the high-side N-channel MOSFET. EXT_BOOST 11 This pin is used to set boost mode and monitor the battery voltage that is the input of the boost converter. After VCC POR, the controller will detect the voltage on this pin; if voltage on this pin is below 200mV, the controller is set in synchronous/non-synchronous buck mode and will latch in this state unless VCC is below POR falling threshold; if the voltage on this pin after VCC POR is above 200mV, the controller is set in boost mode and latch in this state. In boost mode, the low-side driver output PWM with same duty cycle with upper-side driver to drive the boost switch. In boost mode, this pin is used to monitor input voltage through a resistor divider. By setting the resistor divider, the high threshold and hysteresis can be programmed. When voltage on this pin is above 0.8V, the PWM output (LGATE) for the boost converter is disabled, and when voltage on this pin is below 0.8V minus the hysteresis, the boost PWM is enabled. In boost mode operation, PFM is disabled when boost PWM is enabled. Check the “2-Stage Boost Buck Converter Operation” on page 16 for more details. SS VI N PH A SE PH A SE LGATE IL IM IT PG O O D SG N D EN M O D E FS Thermal Pad 21 SYNC COMP BOOT A U XV C C VC C EXT_BOOST FB VI N 1 2 3 4 5 6 7 8 9 10 15 14 13 12 11 20 19 18 17 16 PGND PADFN8631 Rev 1.00 Page 3 of 24 March 13, 2015

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ISL85403SYNC 12 This pin can be used to synchronize two or more ISL85403 controllers. Multiple ISL85403s can be synchronized with their SYNC pins connected together. 180° phase shift is automatically generated between the master and slave ICs. The internal oscillator can also lock to an external frequency source applied on this pin with square pulse waveform (with frequency 10% higher than the IC’s local frequency, and pulse width higher than 150ns). Range: 0V to 5.5V. This pin should be left floating if not used. LGATE 13 In synchronous buck mode, this pin is used to drive the lower side MOSFET to improve efficiency. A 5.1k or smaller value resistor has to be added to connect LGATE to ground to avoid falsely turn-on of LGATE caused by coupling noise. In non-synchronous buck when a diode is used as the bottom side power device, this pin should be connected to VCC through a resistor (less than 5k) before IC start-up to have the low-side driver (LGATE) disabled. In boost mode, it can be used to drive the boost power MOSFET. The boost control PWM is same with the buck control PWM. PGND 14 This pin is used as the ground connection of the power flow including driver. Connect it to large ground plane. BOOT 15 This pin provides bias voltage to the high-side MOSFET driver. A bootstrap circuit is used to create a voltage suitable to drive the internal N-channel MOSFET. The boot charge circuitries are integrated inside of the IC. No external boot diode is needed. A 1µF ceramic capacitor is recommended to be used between BOOT and PHASE pin. VIN 16, 17 Connect the input rail to these pins that are connected to the drain of the integrated high-side MOSFET as well as the source for the internal linear regulator that provides the bias of the IC. Range: 3V to 40V. With the part switching, the operating input voltage applied to the VIN pins must be under 40V. This recommendation allows for short voltage ringing spikes (within a couple of ns time range) due to switching while not exceeding “Absolute Maximum Ratings” on page 7. SGND 18 This pin provides the return path for the control and monitor portions of the IC. Connect it to a quiet ground plane. VCC 19 This pin is the output of the internal linear regulator that supplies the bias for the IC including the driver. A minimum 4.7µF decoupling ceramic capacitor is recommended between VCC to ground. AUXVCC 20 This pin is the input of the auxiliary internal linear regulator, which can be supplied by the regulator output after power-up. With such configuration, the power dissipation inside of the IC is reduced. The input range for this LDO is 3V to 20V. In boost mode operation, this pin works as boost output overvoltage detection pin. It detects the boost output through a resistor divider. When voltage on this pin is above 0.8V, the boost PWM is disabled; and when voltage on this pin is below 0.8V minus the hysteresis, the boost PWM is enabled. Range: 0V to 20V. PAD - Bottom thermal pad. It is not connected to any electrical potential of the IC. In layout it must be connected to PCB ground copper plane with area as large as possible to effectively reduce the thermal impedance. Functional Pin Descriptions (Continued) PIN NAME PIN # DESCRIPTION Ordering Information PART NUMBER (Notes 1, 2, 3) PART MARKING TEMP. RANGE (°C) PACKAGE (RoHS Compliant) PKG. DWG. # ISL85403FRZ 85 403FRZ -40 to +105 20 Ld 4x4 QFN L20.4x4C ISL85403DEMO1Z Compact size demo board for SYNC buck ISL85403EVAL2Z Evaluation Board for non-inverting buck-boost configuration NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see product information page for ISL85403. For more information on MSL please see techbrief TB363.FN8631 Rev 1.00 Page 4 of 24 March 13, 2015

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F N 8 63 1 R e v 1 .0 0 P ag e 5 of 2 4 M arch 1 3, 20 1 5 IS L8 5 40 3 BOOT PHASE (x2) RRENT NITOR VIN (x2) PGND LGATE ILIMIT RIVE BOOT REFRESHBlock Diagram PGOOD SS FB CU MO MODE SGND EN FS COMP VCC VIN 0.8V REFERENCE VOLTAGE MONITOR VCC AUXVCC OCP, OVP, OTP PFM LOGIC BOOST MODE CONTROL SLOPE COMPENSATION AUXILARY LDO EA COMPARATOR OSCILLATOR VCC 5 µA + + POWER-ON RESET SOFT-START LOGIC SYNC EXT_BOOST GATE D PFM/FPWM BIAS LDO

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ISL85403Typical Application Schematic I Typical Application Schematic II - VCC Switchover to VOUT Typical Application Schematic III - Boost Buck Converter (a) SYNCHRONOUS BUCK (b) NON-SYNCHRONOUS BUCK VOUTISL85403VCC SGND MODE BOOT VIN PHASE PGND FS EXT_BOOST EN FB COMP VIN AUXVCC LGATE ILIMIT SS SYNC PGOOD VOUTISL85403VCC SGND MODE BOOT VIN PHASE PGND FS EXT_BOOST EN FB COMP VIN AUXVCC LGATE ILIMIT SS SYNC PGOOD (a) SYNCHRONOUS BUCK (b) NON-SYNCHRONOUS BUCK VOUTISL85403VCC SGND MODE BOOT VIN PHASE PGND FS EXT_BOOST EN FB COMP VIN AUXVCC LGATE ILIMIT SS SYNC PGOOD VOUTISL85403VCC SGND MODE BOOT VIN PHASE PGND FS EXT_BOOST EN FB COMP VIN AUXVCC LGATE ILIMIT SS SYNC PGOOD VOUT ISL85403 VCC SGND MODE BOOT VIN PHASE PGNDFS PGOOD EN SS FB COMP AUXVCC LGATE ILIMIT + Battery EXT_BOOST SYNC R1 R2 R3 R4 + (a) 2-STAGE BOOST BUCK (b) NON-INVERTING SINGLE INDUCTOR BUCK BOOST VOUTISL85403 VCC SGND BOOT VIN PHASE PGND FS PGOOD EN SS FB COMP AUXVCC ILIMIT EXT_BOOST SYNC LGATE VIN VCC1M 130kFN8631 Rev 1.00 Page 6 of 24 March 13, 2015

Page 8

ISL85403Absolute Maximum Ratings Thermal Information VIN, PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +44V VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +6.0V AUXVCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +22V Absolute Boot Voltage, VBOOT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +50.0V Upper Driver Supply Voltage, VBOOT - VPHASE. . . . . . . . . . . . . . . . . . . +6.0V All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC + 0.3V ESD Rating Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . .2.5kV Machine Model (Tested per JESD22-A115C) . . . . . . . . . . . . . . . . . . 250V Charged Device Model (Tested per JESD22-C101E). . . . . . . . . . . . . . 1kV Latch-up Rating (Tested per JESD78B; Class II, Level A) . . . . . . . . . 100mA Thermal Resistance JA (°C/W) JC (°C/W) QFN 4x4 Package (Notes 4, 5). . . . . . . . . . . . . . . 40 3.5 Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . . . . +150°C Maximum Storage Temperature Range. . . . . . . . . . . . . . . . . -65°C to +150°C Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493 Recommended Operating Conditions Supply Voltage on VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 40V AUXVCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +20V Ambient Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 4. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside. Electrical Specifications Refer to “Block Diagram” on page 5 and “Typical Application Schematics” on page 6. Operating Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 4.5V ±10%, TA = -40°C to +105°C. Typicals are at TA = +25°C. Boldface limits apply across the operating temperature range, -40°C to +105°C. PARAMETER SYMBOL TEST CONDITIONS MIN (Note 6) TYP MAX (Note 6) UNITS VIN PIN SUPPLY VIN Pin Voltage Range VIN Pin 3.05 40 V VIN Pin connected to VCC 3.05 5.5 V Operating Supply Current IQ MODE = VCC/FLOATING (PFM), no load at the output 300 µA MODE = GND (forced PWM), VIN = 12V, IC operating, not including driving current 1.3 mA Shutdown Supply Current IIN_SD EN connected to GND, VIN = 12V 2.8 4.5 µA INTERNAL MAIN LINEAR REGULATOR MAIN LDO VCC Voltage VCC VIN > 5V 4.2 4.5 4.8 V MAIN LDO Dropout Voltage VDROPOUT_MAIN VIN = 4.2V, IVCC = 35mA 0.3 0.52 V VIN = 3V, IVCC = 25mA 0.25 0.42 V VCC Current Limit of MAIN LDO 60 mA INTERNAL AUXILIARY LINEAR REGULATOR AUXVCC Input Voltage Range VAUXVCC 3 20 V AUX LDO VCC Voltage VCC VAUXVCC > 5V 4.2 4.5 4.8 V LDO Dropout Voltage VDROPOUT_AUX VAUXVCC = 4.2V, IVCC = 35mA 0.3 0.52 V VAUXVCC = 3V, IVCC = 25mA 0.25 0.42 V Current Limit of AUX LDO 60 mA AUX LDO Switchover Rising Threshold VAUXVCC_RISE AUXVCC voltage rise; Switch to auxiliary LDO 2.97 3.1 3.2 V AUX LDO Switchover Falling Threshold Voltage VAUXVCC_FALL AUXVCC voltage fall; Switch back to main BIAS LDO 2.73 2.87 2.97 V AUX LDO Switchover Hysteresis VAUXVCC_HYS AUXVCC switchover hysteresis 0.2 VFN8631 Rev 1.00 Page 7 of 24 March 13, 2015

Page 9

ISL85403POWER-ON RESET Rising VCC POR Threshold VPORH_RISE 2.82 2.9 3.05 V Falling VCC POR Threshold VPORL_FALL 2.6 2.8 V VCC POR Hysteresis VPORL_HYS 0.3 V ENABLE Enable On Voltage VENH 1.7 V Enable Off voltage VENL 1 V EN Pull-up Current IEN_PULLUP VEN = 1.2V, VIN = 24V 1.5 µA VEN = 1.2V, VIN = 12V 1.2 µA VEN = 1.2V, VIN = 5V 0.9 µA OSCILLATOR PWM Frequency FOSC RT = 665kΩ 160 200 240 kHz RT = 51.1kΩ 1870 2200 2530 kHz FS pin connected to VCC or floating or GND 450 500 550 kHz MIN ON Time tMIN_ON 130 225 ns MIN OFF Time tMIN_OFF 210 330 ns SYNCHRONIZATION Input High Threshold VIH 2 V Input Low Threshold VIL 0.5 V Input Minimum Pulse Width 25 ns Input Impedance 100 kΩ Input Minimum Frequency Divided by Free Running Frequency 1.1 Input Maximum Frequency Divided by Free Running Frequency 1.6 Output Pulse Width CSYNC = 100pF 100 ns Output Pulse High VOH RLOAD = 1kΩ VCC-0.25 V Output Pulse Low VOL GND V REFERENCE VOLTAGE Reference Voltage VREF 0.8 V System Accuracy -1.0 +1.0 % FB Pin Source Current 5 nA Soft-start Soft-start Current ISS 3 5 7 µA ERROR AMPLIFIER Unity Gain-bandwidth CLOAD = 50pF 10 MHz DC Gain CLOAD = 50pF 88 dB Maximum Output Voltage 3.6 V Minimum Output Voltage 0.5 V Slew Rate SR CLOAD = 50pF 5 V/µs Electrical Specifications Refer to “Block Diagram” on page 5 and “Typical Application Schematics” on page 6. Operating Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 4.5V ±10%, TA = -40°C to +105°C. Typicals are at TA = +25°C. Boldface limits apply across the operating temperature range, -40°C to +105°C. (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN (Note 6) TYP MAX (Note 6) UNITSFN8631 Rev 1.00 Page 8 of 24 March 13, 2015

Page 10

ISL85403PFM MODE CONTROL Default PFM Current Threshold MODE = VCC or floating 700 mA INTERNAL HIGH-SIDE MOSFET Upper MOSFET rDS(ON) rDS(ON)_UP Limits apply for +25°C only 127 140 mΩ LOW-SIDE MOSFET GATE DRIVER LGate Source Resistance 100mA source current 3.5 Ω LGATE Sink Resistance 100mA sink current 2.8 Ω BOOST CONVERTER CONTROL EXT_BOOST Boost_Off Threshold Voltage 0.74 0.8 0.86 V EXT_BOOST Hysteresis Sink Current IEXT_BOOST_HYS 2.1 3.2 4.2 µA AUXVCC Boost Turn-Off Threshold Voltage 0.74 0.8 0.86 V AUXVCC Hysteresis Sink Current IAUXVCC_HYS 2.1 3.2 4.2 µA POWER-GOOD MONITOR Overvoltage Rising Trip Point VFB/VREF Percentage of reference point 104 110 116 % Overvoltage Rising Hysteresis VFB/VOVTRIP Percentage below OV trip point 3 % Undervoltage Falling Trip Point VFB/VREF Percentage of reference point 84 90 96 % Undervoltage Falling Hysteresis VFB/VUVTRIP Percentage above UV trip point 3 % PGOOD Rising Delay tPGOOD_R_DELAY 128 cycle PGOOD Leakage Current PGOOD HIGH, VPGOOD = 4.5V 10 nA PGOOD Low Voltage VPGOOD PGOOD LOW, IPGOOD = 0.2mA 0.10 V OVERCURRENT PROTECTION Default Cycle-by-cycle Current Limit Threshold IOC_1 ILIMIT = GND or VCC or floating 3 3.6 4.2 A Hiccup Current Limit Threshold IOC_2 Hiccup, IOC_2/IOC_1 115 % OVERVOLTAGE PROTECTION OV 120% Trip Point Active in and after soft-start. Percentage of reference point LG = UG = LOW 120 % OV 120% Release Point Active in and after soft-start. Percentage of reference point 102.5 % OV 110% Trip Point Active after soft-start done. Percentage of reference point LG = UG = LOW 110 % OV 110% Release Point Active after soft-start done. Percentage of reference point 102.5 % OVER-TEMPERATURE PROTECTION Over-temperature Trip Point 160 °C Over-temperature Recovery Threshold 140 °C NOTE: 6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production tested. Electrical Specifications Refer to “Block Diagram” on page 5 and “Typical Application Schematics” on page 6. Operating Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 4.5V ±10%, TA = -40°C to +105°C. Typicals are at TA = +25°C. Boldface limits apply across the operating temperature range, -40°C to +105°C. (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN (Note 6) TYP MAX (Note 6) UNITSFN8631 Rev 1.00 Page 9 of 24 March 13, 2015

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August 6, 2020

The capacitors were exactly the ones I wanted. Perfect fit.

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