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MAX1632AEAI+T

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MAX1632AEAI+T

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Part Number MAX1632AEAI+T
Manufacturer Maxim Integrated
Description IC REG TRPL BCK/LINEAR 28-SSOP
Datasheet MAX1632AEAI+T Datasheet
Package 28-SSOP (0.209", 5.30mm Width)
In Stock 11,290 piece(s)
Unit Price $ 6.6830 *
Lead Time Can Ship Immediately
Estimated Delivery Time Aug 9 - Aug 14 (Choose Expedited Shipping)
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Part Number # MAX1632AEAI+T (PMIC - Voltage Regulators - Linear + Switching) is manufactured by Maxim Integrated 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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MAX1632AEAI+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - Linear + Switching
Datasheet MAX1632AEAI+TDatasheet
Package28-SSOP (0.209", 5.30mm Width)
Series-
TopologyStep-Down (Buck) (2), Linear (LDO) (1)
FunctionAny Function
Number of Outputs3
Frequency - Switching200kHz ~ 300kHz
Voltage/Current - Output 1Controller
Voltage/Current - Output 2Controller
Voltage/Current - Output 312V, 120mA
w/LED DriverNo
w/SupervisorNo
w/SequencerYes
Voltage - Supply4.2 V ~ 30 V
Operating Temperature-40°C ~ 85°C
Mounting TypeSurface Mount
Package / Case28-SSOP (0.209", 5.30mm Width)
Supplier Device Package28-SSOP

MAX1632AEAI+T Datasheet

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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ________________General Description The MAX1630A–MAX1635A are buck-topology, step- down, switch-mode, power-supply controllers that gener- ate logic-supply voltages in battery-powered systems. These high-performance, dual-/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low-dropout circuitry, internal frequency-com- pensation networks, and automatic bootstrapping. Up to 96% efficiency is achieved through synchronous rectification and Maxim’s proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system- suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Strong 1A on-board gate drivers ensure fast external n-channel MOSFET switching. These devices feature a logic-controlled and synchroniz- able, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile communications and pen-entry appli- cations. Asserting the SKIP pin enables fixed-frequency mode for lowest noise under all load conditions. The MAX1630A–MAX1635A include two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback regulation, and the MAX1630A/MAX1632A/MAX1633A/ MAX1635A each contain 12V/120mA linear regulators. The MAX1631A/MAX1634A include a secondary feed- back input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor-divider, and is intended to aid in creating auxiliary voltages other than fixed 12V. The MAX1630A/MAX1631A/MAX1632A contain internal output overvoltage and undervoltage protection features. The MAX1630A family has improved RF immunity over the MAX1630 family. ________________________Applications Notebook and Subnotebook Computers PDAs and Mobile Communicators Desktop CPU Local DC-DC Converters ____________________________Features ♦ 96% Efficiency ♦ +4.2V to +30V Input Range ♦ 2.5V to 5.5V Dual Adjustable Outputs ♦ Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™) ♦ 12V Linear Regulator ♦ Adjustable Secondary Feedback (MAX1631A/MAX1634A) ♦ 5V/50mA Linear Regulator Output ♦ Precision 2.5V Reference Output ♦ Programmable Power-Up Sequencing ♦ Power-Good (RESET) Output ♦ Output Overvoltage Protection (MAX1630A/MAX1631A/MAX1632A) ♦ Output Undervoltage Shutdown (MAX1630A/MAX1631A/MAX1632A) ♦ 200kHz/300kHz Low-Noise, Fixed-Frequency Operation ♦ Low-Dropout, 99% Duty-Factor Operation ♦ 2.5mW Typical Quiescent Power (+12V Input, Both SMPSs On) ♦ 4µA Typical Shutdown Current ♦ 28-Pin SSOP Package M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers ________________________________________________________________ Maxim Integrated Products 1 5V LINEAR 12V LINEAR POWER-UP SEQUENCE POWER- GOOD 3.3V SMPS 5V SMPS RESETON/OFF +5V (RTC) +3.3V INPUT +5V +12V ________________Functional Diagram 19-3518; Rev 1; 8/05 PART MAX1630AEAI -40°C to +85°C TEMP RANGE PIN-PACKAGE 28 SSOP EVALU ATION KIT AVAIL ABLE _______________Ordering Information +Denotes lead-free package. Ordering Information continued at end of data sheet. Pin Configurations and Selector Guide appear at end of data sheet. Idle Mode and Dual Mode are trademarks of Maxim Integrated Products, Inc.

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M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. V+ to GND..............................................................-0.3V to +36V PGND to GND.....................................................................±0.3V VL to GND ................................................................-0.3V to +6V BST3, BST5 to GND ...............................................-0.3V to +36V LX3 to BST3..............................................................-6V to +0.3V LX5 to BST5..............................................................-6V to +0.3V REF, SYNC, SEQ, STEER, SKIP, TIME/ON5, SECFB, RESET to GND .......................................-0.3V to +6V VDD to GND............................................................-0.3V to +20V RUN/ON3, SHDN to GND.............................-0.3V to (V+ + 0.3V) 12OUT to GND ...........................................-0.3V to (VDD + 0.3V) DL3, DL5 to PGND........................................-0.3V to (VL + 0.3V) DH3 to LX3 ...............................................-0.3V to (BST3 + 0.3V) DH5 to LX5 ...............................................-0.3V to (BST5 + 0.3V) VL, REF Short to GND ................................................Momentary 12OUT Short to GND..................................................Continuous REF Current...........................................................+5mA to -1mA VL Current.........................................................................+50mA 12OUT Current ...............................................................+200mA VDD Shunt Current ............................................................+15mA Operating Temperature Ranges MAX163_ACAI ....................................................0°C to +70°C MAX163_AEAI .................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Continuous Power Dissipation (TA = +70°C) SSOP (derate 9.52mW/°C above +70°C) ....................762mW Lead Temperature (soldering, 10s) .................................+300°C CONDITIONS V4.2 30.0Input Voltage Range UNITSMIN TYP MAXPARAMETER Either SMPS V+ = 4.2V to 30V, CSH3–CSL3 = 0V, CSL3 tied to FB3 VREF 5.5 V2.42 2.5 2.58 3V Output Voltage in Adjustable Mode Output Voltage Adjust Range Either SMPS, 5.2V < V+ < 30V %/V0.03 Either SMPS, 0V < CSH_- CSL_ < 80mV Line Regulation Dual Mode comparator %-2 V0.5 1.1Adjustable-Mode Threshold Voltage Load Regulation SYNC = VL From enable to 95% full current limit with respect to fOSC (Note 1) 270 300 330 Clks512 SKIP = 0V, not tested Soft-Start Ramp Time mV10 25 40Idle Mode Threshold SYNC = 0V kHz 170 200 230 Oscillator Frequency V+ = 4.2V to 30V, 0mV < CSH3–CSL3 < 80mV, FB3 = 0V V3.20 3.39 3.473V Output Voltage in Fixed Mode V+ = 4.2V to 30V, CSH5–CSL5 = 0V, CSL5 tied to FB5 V2.42 2.5 2.58 5V Output Voltage in Adjustable Mode V+ = 5.2V to 30V, 0mV < CSH–CSL5 < 80mV, FB5 = 0V V4.85 5.13 5.255V Output Voltage in Fixed Mode SYNC = VL 97 98 SYNC = 0V (Note 2) % 98 99 Maximum Duty Factor CSH3–CSL3 or CSH5–CSL5 80 100 120 SKIP = VL or VDD < 13V or SECFB < 2.44V mV -50 -100 -150 Current-Limit Threshold MAIN SMPS CONTROLLERS

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M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) V+ = VL = 0V, CSL3 = CSH3 = CSL5 = CSH5 = 5.5V µA0.01 10 Not tested Current-Sense Input Leakage Current Not tested Rising edge, hysteresis = 1% (Note 3) VDD < 13V or SECFB < 2.44V V18 20 µs1 Falling edge (MAX1631A/MAX1634A) DL Pulse Width Falling edge (Note 3) VDD Shunt Threshold V2.44 2.60 V13 14 CONDITIONS VDD Regulation Threshold SECFB Regulation Threshold VDD = 20V (Note 3) VDD = 5V, off mode (Notes 3, 4) µA30VDD Leakage Current mA10VDD Shunt Sink Current ns200 ns200SYNC Input High Pulse Width SYNC Input Low Pulse Width 13V < VDD < 18V, 0mA < ILOAD < 120mA V11.65 12.1 12.5012OUT Output Voltage UNITSMIN TYP MAXPARAMETER Not tested ns200SYNC Rise/Fall Time kHz240 350SYNC Input Frequency Range VDD = 18V, run mode, no 12OUT load 12OUT forced to 11V, VDD = 13V µA50 100 mA15012OUT Current Limit Quiescent VDD Current Rising edge of CSL5, hysteresis = 1% Falling edge, hysteresis = 1% V4.2 4.5 4.7 V3.5 3.6 3.7 VL Undervoltage Lockout Fault Threshold VL Switchover Threshold SHDN = V+, RUN/ON3 = TIME/ON5 = 0V, 5.3V < V+ < 30V, 0mA < ILOAD < 50mA V4.7 5.1VL Output Voltage Falling edge V1.8 2.4 µA10REF Sink Current REF Fault Lockout Voltage V+ = 4V to 24V, SHDN = 0V V+ = 4.2V to 5.5V, both SMPSs off, includes current into SHDN µA4 10 µA50 200 V+ Standby Supply Current in Dropout V+ Shutdown Supply Current V+ = 5.5V to 30V, both SMPSs off, includes current into SHDN VL switched over to CSL5, 5V SMPS on µA30 60 µA5 50V+ Operating Supply Current V+ Standby Supply Current 0µA < ILOAD < 50µA No external load (Note 5) 12.5 V2.45 2.5 2.55REF Output Voltage 2.5 4Both SMPSs enabled, FB3 = FB5 = 0V, CSL3 = CSH3 = 3.5V, CSL5 = CSH5 = 5.3V mW 1.5 4 Quiescent Power Consumption (Note 3) MAX1631A/ MAX1634A 0mA < ILOAD < 5mA mV 100.0 REF Load Regulation FLYBACK CONTROLLER 12V LINEAR REGULATOR (Note 3) INTERNAL REGULATOR AND REFERENCE

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M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers 4 _______________________________________________________________________________________ Note 1: Each of the four digital soft-start levels is tested for functionality; the steps are typically in 20mV increments. Note 2: High duty-factor operation supports low input-to-output differential voltages, and is achieved at a lowered operating frequency (see Overload and Dropout Operation section). Note 3: MAX1630A/MAX1632A/MAX1633A/MAX1635A only. Note 4: Off mode for the 12V linear regulator occurs when the SMPS that has flyback feedback (VDD) steered to it is disabled. In situations where the main outputs are being held up by external keep-alive supplies, turning off the 12OUT regulator pre- vents a leakage path from the output-referred flyback winding, through the rectifier, and into VDD. Note 5: Since the reference uses VL as its supply, the reference’s V+ line-regulation error is insignificant. ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) Typical hysteresis = +10°C From each SMPS enabled, with respect to fOSC °C150 Clks5000 6144 7000 With respect to unloaded output voltage Output Undervoltage Lockout Time Thermal Shutdown Threshold With respect to fOSC Falling edge, CSL_ driven 2% below RESET trip threshold Clks27,000 32,000 37,000 µs1.5 With respect to unloaded output voltage, falling edge; typical hysteresis = 1% RESET Propagation Delay RESET Delay Time %-7 -5.5 -4 CONDITIONS RESET Trip Threshold RESET, ISINK = 4mA RUN/ON3, SKIP, TIME/ON5 (SEQ = REF), SHDN, STEER, SYNC, SEQ; VPIN = 0V or 3.3V V0.4 µA±1Input Leakage Current Logic Output Low Voltage CSL_ driven 2% above overvoltage trip threshold µs FB3, FB5; SECFB = 2.6V 1.5Overvoltage-Fault Propagation Delay nA1 50 With respect to unloaded output voltage %60 70 80 Feedback Input Leakage Current Output Undervoltage Threshold %4 7 10Overvoltage Trip Threshold RUN/ON3, SKIP, TIME/ON5 (SEQ = REF), SHDN, STEER, SYNC RUN/ON3, SKIP, TIME/ON5 (SEQ = REF), SHDN, STEER, SYNC V2.4 V0.6Logic Input Low Voltage Logic Input High Voltage UNITSMIN TYP MAXPARAMETER High or low DL3, DH3, DL5, DH5; forced to 2V Ω1.5 7 A1Gate Driver Sink/Source Current Gate Driver On-Resistance RESET = 3.5V mA1Logic Output High Current TIME/ON5 = 0V, SEQ = 0V or VL SEQ = 0V or VL µA2.5 3 3.5 V2.4 2.6TIME/ON5 Input Trip Level TIME/ON5 Source Current TIME/ON5; RUN/ON3 = 0V, SEQ = 0V or VL Ω15 80TIME/ON5 On-Resistance FAULT DETECTION (MAX1630A/MAX1631A/MAX1632A) INPUTS AND OUTPUTS RESET

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M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers _______________________________________________________________________________________ 5 100 50 0.001 0.01 0.1 1 10 EFFICIENCY vs. 5V OUTPUT CURRENT 60 M A X 1 6 3 0 A /3 5 A t o c0 1 5V OUTPUT CURRENT (A) EF FI C IE N C Y ( % ) 70 80 90 ON5 = 5V ON3 = 0V f = 300kHz MAX1631A/MAX1634A V+ = 6V V+ = 15V 100 50 0.001 0.01 0.1 1 10 EFFICIENCY vs. 3.3V OUTPUT CURRENT 60 M A X 1 6 3 0 A /3 5 A t o c0 2 3.3V OUTPUT CURRENT (A) EF FI C IE N C Y ( % ) 70 80 90 ON3 = ON5 = 5V f = 300kHz MAX1631A/MAX1634A V+ = 6V V+ = 15V 800 0 15 20 MAX1632A/MAX1635A MAXIMUM 15V VDD OUTPUT CURRENT vs. SUPPLY VOLTAGE 600 M A X 1 6 3 0 A /3 5 A t o c0 3 SUPPLY VOLTAGE (V) M A X IM U M O U TP U T C U R R EN T (m A ) 0 200 10 400 5 VDD > 13V 5V REGULATING 5V LOAD = 0A 5V LOAD = 3A 500 0 15 20 MAX1630A/MAX1633A MAXIMUM 15V VDD OUTPUT CURRENT vs. SUPPLY VOLTAGE 400 M A X 1 6 3 0 A /3 5 A t o c0 4 SUPPLY VOLTAGE (V) M A X IM U M O U TP U T C U R R EN T (m A ) 0 200 100 10 300 5 VDD > 13V 3.3V REGULATING 3.3V LOAD = 0A 3.3V LOAD = 3A 10,000 1 0 30 STANDBY INPUT CURRENT vs. INPUT VOLTAGE 1000 M A X 1 6 3 0 A /3 5 A t o c0 7 INPUT VOLTAGE (V) IN P U T C U R R EN T (μ A ) 15 10 5 10 25 100 20 ON3 = ON5 = 0V NO LOAD 30 0 5 0 30 PWM MODE INPUT CURRENT vs. INPUT VOLTAGE M A X 1 6 3 0 A /3 5 A t o c0 5 INPUT VOLTAGE (V) IN P U T C U R R EN T (m A ) 15 10 15 5 10 25 20 25 20 ON3 = ON5 = 5V SKIP = VL NO LOAD 10 0.01 0 30 IDLE MODE INPUT CURRENT vs. INPUT VOLTAGE M A X 1 6 3 0 A /3 5 A t o c0 6 INPUT VOLTAGE (V) IN P U T C U R R EN T (m A ) 15 0.1 5 10 25 1 20 ON3 = ON5 = 5V SKIP = 0V NO LOAD 10 0 0 30 SHUTDOWN INPUT CURRENT vs. INPUT VOLTAGE 8 M A X 1 6 3 0 A /3 5 A t o c0 8 INPUT VOLTAGE (V) IN P U T C U R R EN T ( μ A ) 15 4 2 5 10 25 6 20 SHDN = 0V 1000 1 0.001 0.1 101 MINIMUM VIN TO VOUT DIFFERENTIAL vs. 5V OUTPUT CURRENT 10 100 M A X 1 6 3 0 A /3 5 A t o c0 9 5V OUTPUT CURRENT (A) M IN V IN T O V O U T D IF FE R EN TI A L (m V ) 0.01 5V, 3A CIRCUIT VOUT > 4.8V f = 300kHz __________________________________________Typical Operating Characteristics (Circuit of Figure 1, 3A Table 1 components, TA = +25°C, unless otherwise noted.)

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__________________________________________________________________________Pin Description M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers 6 _______________________________________________________________________________________ ____________________________________Typical Operating Characteristics (continued) (Circuit of Figure 1, 3A Table 1 components, TA = +25°C, unless otherwise noted.) 1000 0.1 0.1 10 1000100 SWITCHING FREQUENCY vs. LOAD CURRENT 10 1 100 M A X 1 6 3 0 A /3 5 A t o c0 1 0 LOAD CURRENT (mA) S W IT C H IN G F R EQ U EN C Y ( kH z) 1 +5V, VIN = 15V +3.3V, VIN = 15V +3.3V, VIN = 6V +5V, VIN = 6V 5.00 4.90 50 60 VL REGULATOR OUTPUT VOLTAGE vs. OUTPUT CURRENT 4.98 M A X 1 6 3 0 A /3 5 A t o c1 1 OUTPUT CURRENT (mA) V L O U TP U T V O LT A G E (V ) 0 4.94 4.92 30 40 4.96 10 20 VIN = 15V ON3 = ON5 = 0V 2.510 2.480 2.485 5 6 REF OUTPUT VOLTAGE vs. OUTPUT CURRENT 2.505 M A X 1 6 3 0 A /3 5 A t o c1 2 OUTPUT CURRENT (mA) R EF O U TP U T V O LT A G E (V ) 0 2.495 2.490 3 4 2.500 1 2 VIN = 15V ON3 = ON5 = 0V 2ms/div STARTUP WAVEFORMS RUN 5V/div 3.3V OUTPUT 2V/div TIME 5V/div 5V OUTPUT 5V/div SEQ = VL, 0.015μF CAPACITOR ON-TIME M A X 1 6 3 0 A /3 5 A t o c1 3 4 1 CSH3 Current-Sense Input for the 3.3V SMPS. Current-limit level is 100mV referred to CSL3. STEER (MAX1631A/ MAX1634A) Logic-Control Input for secondary feedback. Selects the PWM that uses a transformer and secondary feedback signal (SECFB): STEER = GND: 3.3V SMPS uses transformer STEER = VL: 5V SMPS uses transformer PIN NAME FUNCTION 2 CSL3 Current-Sense Input. Also serves as the feedback input in fixed-output mode. 12OUT (MAX1630A/ 32A/33A/35A) 12V/120mA Linear Regulator Output. Input supply comes from VDD. Bypass 12OUT to GND with 1µF minimum. 3 FB3 Feedback Input for the 3.3V SMPS; regulates at FB3 = REF (approx. 2.5V) in adjustable mode. FB3 is a Dual Mode input that also selects the 3.3V fixed output voltage setting when tied to GND. Connect FB3 to a resistor-divider for adjustable-output mode.

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M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers _______________________________________________________________________________________ 7 _________________________________________________Pin Description (continued) 5 26 LX3 Switching Node (Inductor) Connection. Can swing 2V below ground without hazard. 27 DH3 Gate-Drive Output for the 3.3V, High-Side n-Channel Switch. DH3 is a floating driver output that swings from LX3 to BST3, riding on the LX3 switching node voltage. 28 RUN/ON3 ON/OFF Control Input. See Power-Up Sequencing and ON/OFF Controls section. 24 DL3 Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0V to VL. 25 BST3 Boost Capacitor Connection for High-Side Gate Drive (0.1µF) SECFB (MAX1631A/ MAX1634A) Secondary Winding Feedback Input. Normally connected to a resistor-divider from an auxiliary output. SECFB regulates at VSECFB = 2.5V (see Secondary Feedback Regulation Loop section). Tie to VL if not used. VDD (MAX1630A/ 32A/33A/35A) Supply Voltage Input for the 12OUT Linear Regulator. Also connects to an internal resistor-divider for secondary winding feedback, and to an 18V overvoltage shunt regulator clamp. 21 VL 5V Internal Linear-Regulator Output. VL is also the supply voltage rail for the chip. After the 5V SMPS output has reached +4.5V (typical), VL automatically switches to the output voltage through CSL5 for bootstrapping. Bypass to GND with 4.7µF. VL supplies up to 25mA for external loads. 22 V+ Battery Voltage Input, +4.2V to +30V. Bypass V+ to PGND close to the IC with a 0.22µF capacitor. Connects to a linear regulator that powers VL. 23 SHDN Shutdown Control Input, Active Low. Logic threshold is set at approximately 1V. For automatic startup, connect SHDN to V+ through a 220kΩ resistor and bypass SHDN to GND with a 0.01µF capacitor. 13 CSL5 Current-Sense Input for the 5V SMPS. Also serves as the feedback input in fixed-output mode, and as the bootstrap supply input when the voltage on CSL5/VL is > 4.5V. 14 CSH5 Current-Sense Input for the 5V SMPS. Current-limit level is 100mV referred to CSL5. 17 LX5 Switching Node (Inductor) Connection. Can swing 2V below ground without hazard. 18 BST5 Boost Capacitor Connection for High-Side Gate Drive (0.1µF) 19 DL5 Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0V to VL. 20 PGND Power Ground 15 SEQ Pin-Strap Input that Selects the SMPS Power-Up Sequence: SEQ = GND: 5V before 3.3V, RESET output determined by both outputs SEQ = REF: Separate ON3/ON5 controls, RESET output determined by 3.3V output SEQ = VL: 3.3V before 5V, RESET output determined by both outputs 16 DH5 Gate-Drive Output for the 5V, High-Side n-Channel Switch. DH5 is a floating driver output that swings from LX5 to BST5, riding on the LX5 switching node voltage. 12 FB5 Feedback Input for the 5V SMPS; regulates at FB5 = REF (approximately 2.5V) in adjustable mode. FB5 is a Dual Mode input that also selects the 5V fixed output voltage setting when tied to GND. Connect FB5 to a resistor-divider for adjustable-output mode. 8 GND Low-Noise Analog Ground and Feedback Reference Point 9 REF 2.5V Reference Voltage Output. Bypass to GND with 1µF minimum. 10 SKIP Logic-Control Input that Disables Idle Mode when High. Connect to GND for normal use. 11 RESET Active-Low Timed Reset Output. RESET swings GND to VL. Goes high after a fixed 32,000 clock-cycle delay following power-up. 6 SYNC Oscillator Synchronization and Frequency Select. Tie to VL for 300kHz operation; tie to GND for 200kHz operation. Can be driven at 240kHz to 350kHz for external synchronization. 7 TIME/ON5 Dual-Purpose Timing Capacitor Pin and ON/OFF Control Input. See Power-Up Sequencing and ON/OFF Controls section. NAME FUNCTIONPIN

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_______Standard Application Circuit The basic MAX1631A/MAX1634A dual-output 3.3V/5V buck converter (Figure 1) is easily adapted to meet a wide range of applications with inputs up to 28V by substituting components from Table 1. These circuits represent a good set of tradeoffs between cost, size, and efficiency, while staying within the worst-case specification limits for stress-related parameters, such as capacitor ripple current. Do not change the frequen- cy of these circuits without first recalculating compo- nent values (particularly inductance value at maximum battery voltage). Adding a Schottky rectifier across each synchronous rectifier improves the efficiency of these circuits by approximately 1%, but this rectifier is otherwise not needed because the MOSFETs required for these circuits typically incorporate a high-speed sili- con diode from drain to source. Use a Schottky rectifier rated at a DC current equal to at least 1/3 of the load current. M A X 1 6 3 0 A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers 8 _______________________________________________________________________________________ MAX1631A MAX1634A V+ SHDN VLSECFB INPUT ON/OFF C3 GND REF SEQ 1μF +2.5V ALWAYS ON *1A SCHOTTKY DIODE REQUIRED FOR THE MAX1631A (SEE OUTPUT OVERVOLTAGE PROTECTION SECTION). +5V ALWAYS ON Q1 5V ON/OFF 3.3V ON/OFF Q4 0.1μF0.1μF L2 R2 +3.3V OUTPUT C2* 4.7μF 0.1μF 4.7μF 0.1μF 10Ω 0.1μF Q3 0.1μF DL3 CSH3 CSL3 FB3 RESET RESET OUTPUT SKIP STEER Q2 L1R1+5V OUTPUT C1 DL5 LX5 DH5 BST5 BST3 SYNC DH3 LX3 PGND CSL5 CSH5 RUN/ON3 TIME/ON5 FB5 * Figure 1. Standard 3.3V/5V Application Circuit (MAX1631A/MAX1634A)

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M A X 1 6 3 0 A A – M A X 1 6 3 5 A Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers _______________________________________________________________________________________ 9 Input Range Application Table 1. Component Selection for Standard 3.3V/5V Application Table 2. Component Suppliers 4.75V to 18V PDA 2A 4.75V to 28V Notebook 3A 4.75V to 24V Workstation 4A Frequency 300kHz 1/2 IR IRF7301; 1/2 Siliconix Si9925DQ; or 1/2 Motorola MMDF3N03HD or MMDF4N01HD (10V max) 300kHz IR IRF7403 or IRF7401 (18V max); Siliconix Si4412DY; or Motorola MMSF5N03HD or MMSF5N02HD (18V max) 200kHz IR IRF7413 or Siliconix Si4410DY Q1, Q3 High-Side MOSFETs Q2, Q4 Low-Side MOSFETs 1/2 IR IRF7301; 1/2 Siliconix Si9925DQ; or 1/2 Motorola MMDF3N03HD or MMDF4N01HD (10V max) 10µF, 30V Sanyo OS-CON; 22µF, 35V AVX TPS; or Sprague 594D IR IRF7403 or IRF7401 (18V max); Siliconix Si4412DY; or Motorola MMSF5N03HD or MMSF5N02HD (18V max) 2 x 10µF, 30V Sanyo OS-CON; 2 x 22µF, 35V AVX TPS; or Sprague 594D IR IRF7413 or Siliconix Si4410DY 3 x 10µF, 30V Sanyo OS-CON; 4 x 22µF, 35V AVX TPS; or Sprague 595D C1, C2 Output Capacitors 220µF, 10V AVX TPS or Sprague 595D 0.033Ω IRC LR2010-01-R033 or Dale WSL2010-R033-F 2 x 220µF, 10V AVX TPS or Sprague 595D 0.02Ω IRC LR2010-01-R020 or Dale WSL2010-R020-F 4 x 220µF, 10V AVX TPS or Sprague 595D 0.012Ω Dale WSL2512-R012-FR1, R2 Resistors C3 Input Capacitor 15µH, 2.4A Ferrite Coilcraft DO3316P-153 or Sumida CDRH125-150 10µH, 4A Ferrite Coilcraft DO3316P-103 or Sumida CDRH125-100 4.7µH, 5.5A Ferrite Coilcraft DO3316-472 or 5.2µH, 6.5A Ferrite Sumida CDRH127-5R2MC L1, L2 Inductors AVX (1) 803-626-3123 (1) 516-435-1824 FACTORY FAX (COUNTRY CODE) 803-946-0690 516-435-1110 USA PHONE Coilcraft (1) 847-639-1469 847-639-6400 Central Semiconductor COMPANY Coiltronics (1) 561-241-9339 (1) 605-665-1627 561-241-7876 605-668-4131 International Rectifier (IR) (1) 310-322-3332 310-322-3331 Dale IRC (1) 512-992-3377 (1) 714-960-6492 512-992-7900 714-969-2491Matsuo Motorola (1) 602-994-6430 (81) 3-3494-7414 FACTORY FAX (COUNTRY CODE) 602-303-5454 805-867-2555* USA PHONE Siliconix (1) 408-970-3950 (1) 603-224-1430 Sanyo (81) 7-2070-1174 408-988-8000 619-661-6835 603-224-1961 Sumida (81) 3-3607-5144 847-956-0666 Sprague TDK (1) 847-390-4428 (1) 702-831-3521 847-390-4373 702-831-0140 Transpower Technologies NIEC COMPANY Murata-Erie (1) 814-238-0490 814-237-1431 *Distributor LOAD CURRENT COMPONENT

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Mir*****a Cox

July 18, 2020

Great dealing with you Guys. Thanks for a very prompt delivery.

Melan*****nesan

July 16, 2020

All of the components worked, and are still working. So even though the price is amazingly low, the diodes really do work!

Alyso*****nandez

July 16, 2020

Replaced a diode in my distortion pedal. Sounds different (lower growl) but in a good way...LOL!

Saw***** Om

July 12, 2020

They worked great. Not much to say - as far as I can tell they adhere to the specs, and did the job I needed them to. Good transistors for higher current situations.

Ryle*****Duncan

July 10, 2020

You're my good supplier. I appreciate Heisener Electronics on many levels.

Ali*****lover

July 5, 2020

Excellent ! MAX1632AEAI+T item arrived very quickly and was packaged well, no issues.

Angel*****dshaw

June 20, 2020

Worked like it was intended.

Amb*****Short

June 11, 2020

Great product & fast shipping. Works as they should.

Kait*****Moon

June 5, 2020

Solved my electrical back feed problems on my alternator.

Marg*****reeman

May 30, 2020

To be honest, you're beating your competitor on delivery - sometimes I request 2nd day and you still get it here overnight. Thanks!

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