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hot RT8015GSP


For Reference Only

Part Number RT8015GSP
Manufacturer Richtek USA Inc.
Datasheet RT8015GSP Datasheet
Package 8-SOIC (0.154", 3.90mm Width) Exposed Pad
In Stock 10862 piece(s)
Unit Price $ 0.3335 *
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RT8015GSP Specifications

ManufacturerRichtek USA Inc.
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Regulators
Datasheet RT8015GSP Datasheet
Package8-SOIC (0.154", 3.90mm Width) Exposed Pad
Output ConfigurationPositive
Output TypeAdjustable
Number of Outputs1
Voltage - Input (Min)2.6V
Voltage - Input (Max)5.5V
Voltage - Output (Min/Fixed)0.8V
Voltage - Output (Max)5V
Current - Output2A
Frequency - Switching300kHz ~ 2MHz
Synchronous RectifierYes
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / Case8-SOIC (0.154", 3.90mm Width) Exposed Pad
Supplier Device Package8-SOP-EP

RT8015GSP Datasheet

Page 1

Page 2

RT8015 1 DS8015-03 March 2011 www.richtek.com Applications l Portable Instruments l Battery-Powered Equipment l Notebook Computers l Distributed Power Systems l IP Phones l Digital Cameras General Description The RT8015 is a high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 2.6V to 5.5V and provides an adjustable regulated output voltage from 0.8V to 5V while delivering up to 2A of output current. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. Switching frequency is set by an external resistor or can be synchronized to an external clock. 100% duty cycle provides low dropout operation extending battery life in portable systems. Current mode operation with external compensation allows the transient response to be optimized over a wide range of loads and output capacitors. RT8015 operation in forced continuous PWM Mode which minimizes ripple voltage and reduces the noise and RF interference. 100% duty cycle in Low Dropout Operation further maximize battery life. Ordering Information Pin Configurations (TOP VIEW) 2A, 2MHz, Synchronous Step-Down Regulator SOP-8 (Exposed Pad) Note : Richtek products are : } RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. } Suitable for use in SnPb or Pb-free soldering processes. Features l High Efficiency : Up to 95% l Low RDS(ON) Internal Switches : 110mΩ l Programmable Frequency : 300kHz to 2MHz l No Schottky Diode Required l 0.8V Reference Allows Low Output Voltage l Forced Continuous Mode Operation l Low Dropout Operation : 100% Duty Cycle l RoHS Compliant and 100% Lead (Pb)-Free SHDN/RT GND LX PGND COMP FB PVDD VDD GND 2 3 4 5 6 7 8 9 Package Type SP : SOP-8 (Exposed Pad-Option 2) RT8015 Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free)

Page 3

RT8015 2 DS8015-03 March 2011www.richtek.com Functional Pin Description Pin No. Pin Name Pin Function 1 SHDN/RT Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the switching frequency. Forcing this pin to VDD causes the device to be shut down. 2, 9 (Exposed Pad) GND Signal Ground. All small-signal components and compensation components should connect to this ground, which in turn connects to PGND at one point. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 3 LX Internal Power MOSFET Switches Output. Connect this pin to the inductor. 4 PGND Power Ground. Connect this pin close to the (−) terminal of CIN and COUT. 5 PVDD Power Input Supply. Decouple this pin to PGND with a capacitor. 6 VDD Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VDD is equal to PVDD. 7 FB Feedback Pin. Receives the feedback voltage from a resistive divider connected across the output. 8 COMP Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Connect external compensation elements to this pin to stabilize the control loop. Typical Application Circuit Note : Using all Ceramic Capacitors VOUT L1 (uH) COUT (uF) R1 (kΩ) R2 (kΩ) RCOMP (kΩ) CCOMP (nF) 3.3V 2.2 22 750 240 13 1 2.5V 2.2 22 510 240 13 1 1.8V 1.0 22 300 240 7.5 1.5 1.2V 1.0 22 120 240 7.5 1.5 Recommended Component for Different Output Voltage Applications 6 VDD PVDD5 RT8015 VIN 2.6V to 5.5V 4 PGND SHDN/RT1 LX 3 COMP FB 7 8 GND 2, Exposed Pad (9) ROSC 332k CIN 22uF L1 2.2uH R1 510k R2 240k COUT 22uFRCOMP 13k CCOMP 1nF VOUT 2.5V/2A

Page 4

RT8015 3 DS8015-03 March 2011 www.richtek.com Function Block Diagram Driver NISEN Control Logic NMOS I Limit 0.9V 0.7V 0.4V OC Limit ISEN Slope Com OSC Output Clamp EA 0.8V Int-SS POR OTPVREF COMP SHDN/RT GND FB PVDD VDD PGND SD LX

Page 5

RT8015 4 DS8015-03 March 2011www.richtek.com Operation Main Control Loop The RT8015 is a monolithic, constant-frequency, current mode step-down DC/DC converter. During normal operation, the internal top power switch (P-Channel MOSFET) is turned on at the beginning of each clock cycle. Current in the inductor increases until the peak inductor current reach the value defined by the voltage on the COMP pin. The error amplifier adjusts the voltage on the COMP pin by comparing the feedback signal from a resistor divider on the FB pin with an internal 0.8V reference. When the load current increases, it causes a reduction in the feedback voltage relative to the reference. The error amplifier raises the COMP voltage until the average inductor current matches the new load current. When the top power MOSFET shuts off, the synchronous power switch (N-Channel MOSFET) turns on until either the bottom current limit is reached or the beginning of the next clock cycle. The operating frequency is set by an external resistor connected between the RT pin and ground. The practical switching frequency can range from 300kHz to 2MHz. Power Good comparators will pull the PGOOD output low if the output voltage comes out of regulation by 12.5%. In an over-voltage condition, the top power MOSFET is turned off and the bottom power MOSFET is switched on until either the over-voltage condition clears or the bottom MOSFET's current limit is reached. Frequency Synchronization The internal oscillator of the RT8011 can be synchronized to an external clock connected to the SYNC pin. The frequency of the external clock can be in the range of 300kHz to 2MHz. For this application, the oscillator timing resistor should be chosen to correspond to a frequency that is about 20% lower than the synchronization frequency. Dropout Operation When the input supply voltage decreases toward the output voltage, the duty cycle increases toward the maximum on-time. Further reduction of the supply voltage forces the main switch to remain on for more than one cycle eventually reaching 100% duty cycle. The output voltage will then be determined by the input voltage minus the voltage drop across the internal P-Channel MOSFET and the inductor. Low Supply Operation The RT8015 is designed to operate down to an input supply voltage of 2.6V. One important consideration at low input supply voltages is that the RDS(ON) of the P-Channel and N-Channel power switches increases. The user should calculate the power dissipation when the RT8015 is used at 100% duty cycle with low input voltages to ensure that thermal limits are not exceeded. Slope Compensation and Inductor Peak Current Slope compensation provides stability in constant frequency architectures by preventing sub-harmonic oscillations at duty cycles greater than 50%. It is accomplished internally by adding a compensating ramp to the inductor current signal. Normally, the maximum inductor peak current is reduced when slope compensation is added. In the RT8015, however, separated inductor current signals are used to monitor over current condition. This keeps the maximum output current relatively constant regardless of duty cycle. Short Circuit Protection When the output is shorted to ground, the inductor current decays very slowly during a single switching cycle. A current runaway detector is used to monitor inductor current. As current increasing beyond the control of current loop, switching cycles will be skipped to prevent current runaway from occurring.

Page 6

RT8015 5 DS8015-03 March 2011 www.richtek.com Absolute Maximum Ratings (Note 1) l Supply Input Voltage, VDD, PVDD --------------------------------------------------------------------------- −0.3V to 6V l LX Pin Switch Voltage ------------------------------------------------------------------------------------------ −0.3V to (PVDD + 0.3V) l Other I/O Pin Voltages------------------------------------------------------------------------------------------ −0.3V to (VDD + 0.3V) l LX Pin Switch Current-------------------------------------------------------------------------------------------4A l Power Dissipation, PD @ TA = 25°C SOP-8 (Exposed Pad) -----------------------------------------------------------------------------------------1.33W l Package Thermal Resistance (Note 2) SOP-8 (Exposed Pad), θJA ------------------------------------------------------------------------------------75°C/W SOP-8 (Exposed Pad), θJC ------------------------------------------------------------------------------------15°C/W l Junction Temperature -------------------------------------------------------------------------------------------150°C l Lead Temperature (Soldering, 10 sec.)----------------------------------------------------------------------260°C l Storage Temperature Range ----------------------------------------------------------------------------------- −65°C to 150°C l ESD Susceptibility (Note 3) HBM (Human Body Mode) -------------------------------------------------------------------------------------2kV MM (Machine Mode) --------------------------------------------------------------------------------------------200V Electrical Characteristics (VDD = 3.3V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Input Voltage Range VDD 2.6 -- 5.5 V Feedback Reference Voltage VREF 0.784 0.8 0.816 V Active , VFB = 0.78V, Not Switching -- 460 -- µA DC Bias Current Shutdown -- -- 1 µA Output Voltage Line Regulation VIN = 2.7V to 5.5V -- 0.04 -- %/V Output Voltage Load Regulation 0A < ILOAD < 2A -- 0.25 -- % Error Amplifier Transconductance gm -- 800 -- us Current Sense Transresistance RT -- 0.4 -- Ω Power Good Range -- ±12.5 ±15 % Power Good Pull-Down Resistance -- -- 120 Ω ROSC = 332k 0.8 1 1.2 MHz Switching Frequency Switching Frequency 0.3 -- 2 MHz Sync Frequency Range 0.3 -- 2 MHz To be continued Recommended Operating Conditions (Note 4) l Supply Input Voltage --------------------------------------------------------------------------------------------2.6V to 5.5V l Junction Temperature Range ---------------------------------------------------------------------------------- −40°C to 125°C l Ambient Temperature Range ---------------------------------------------------------------------------------- −40°C to 85°C

Page 7

RT8015 6 DS8015-03 March 2011www.richtek.com Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. 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 remain possibility to affect device reliability. Note 2. θJA is measured in the natural convection at TA = 25°C on 4-layers high effective thermal conductivity test board of JEDEC 51-7 thermal measurement standard. The case point of θJC is on the exposed pad of the package. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Conditions Min Typ Max Unit Switch On Resistance, High RPMOS ISW = 0.5A -- 110 160 mΩ Switch On Resistance, Low RNMOS ISW = 0.5A -- 110 170 mΩ Peak Current Limit ILIM 2.2 3.2 -- A VDD Rising -- 2.4 -- V Under Voltage Lockout Threshold VDD Falling -- 2.3 -- V Shutdown Threshold VSHDN/RT -- VIN − 0.7 VIN − 0.4 V

Page 8

RT8015 7 DS8015-03 March 2011 www.richtek.com Frequency vs. Temperature 1000 1020 1040 1060 1080 1100 -50 -25 0 25 50 75 100 125 Temperature F re q u e n cy ( kH z) (°C) VIN = 3.3V, VOUT = 1.8V IOUT = 0A Quiescent Current vs. Input Voltage 450 470 490 510 530 550 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 Input Voltage (V) Q u ie sc e n t C u rr e n t ( u A ) Quiescent Current vs. Temperature 400 420 440 460 480 500 -50 -25 0 25 50 75 100 125 Temperature Q u ie sc e n t C u rr e n t ( u A ) (°C) VIN = 3.3V Peak Current Limited vs. Input Voltage 2.0 2.5 3.0 3.5 4.0 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 Input Voltage (V) P e a k C u rr e n t L im ite d ( A ) VOUT = 2.5V Typical Operating Characteristics Output Voltage vs. Output Current 1.790 1.792 1.794 1.796 1.798 1.800 1.802 1.804 1.806 1.808 1.810 0 250 500 750 1000 1250 1500 1750 2000 Output Current (mA) O u tp u t V o lta g e ( V ) VIN = 3.3V Efficiency vs. Output Current 0 10 20 30 40 50 60 70 80 90 100 0 250 500 750 1000 1250 1500 1750 2000 Output Current (mA) E ffi ci e n cy ( % ) VIN = 3.3V, VOUT = 1.8V VIN = 5V, VOUT = 1.8V

Page 9

RT8015 8 DS8015-03 March 2011www.richtek.com VREF vs. Input Voltage 0.800 0.801 0.802 0.803 0.804 0.805 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 Input Voltage (V) V R E F ( V ) Output Ripple Time (250ns/Div) ILX (2A/Div) VOUT (10mV/Div) VIN = 5V, VOUT = 2.5V IOUT = 2A VLX (5V/Div) Output Ripple Time (250ns/Div) ILX (2A/Div) VOUT (10mV/Div) VIN = 3.3V, VOUT = 2.5V IOUT = 2A VLX (5V/Div) Load Transient Response Time (50μs/Div) ILX (1A/Div) VOUT (50mV/Div) VIN = 3.3V, VOUT = 2.5V IOUT = 1A to 2A Load Transient Response Time (50μs/Div) ILX (1A/Div) VOUT (50mV/Div) VIN = 3.3V, VOUT = 2.5V IOUT = 0A to 2A Output Voltage vs. Temperature 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 -50 -25 0 25 50 75 100 125 Temperature O u tp u t V o lta g e ( V ) (°C) VIN = 3.3V

Page 10

RT8015 9 DS8015-03 March 2011 www.richtek.com Soft Start and Inrush Current Time (2.5ms/Div) IIN (2A/Div) VLX (5V/Div) VIN = 5V, VOUT = 2.5V IOUT = 2A VOUT (2V/Div) VIN (2V/Div) Soft Start and Inrush Current Time (2.5ms/Div) IIN (2A/Div) VLX (5V/Div) VIN = 3.3V, VOUT = 2.5V IOUT = 2A VOUT (2V/Div) VIN (2V/Div) Power On & Inductor Current Time (1ms/Div) ILX (2A/Div) VLX (5V/Div) VIN = 3.3V, VOUT = 2.5V IOUT = 2A VOUT (2V/Div) VIN (2V/Div) Power Good Time (1ms/Div) ILX (2A/Div) VOUT (2V/Div) VIN = 3.3V, VOUT = 2.5V IOUT = 2A PGOOD (2V/Div) VIN (2V/Div) Power On & Inductor Current Time (1ms/Div) ILX (2A/Div) VLX (5V/Div) VIN = 5V, VOUT = 2.5V IOUT = 2A VOUT (2V/Div) VIN (2V/Div)

RT8015GSP Reviews

Average User Rating
5 / 5 (181)
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November 21, 2019

This is the best online shop to order electronic components. From a 30 cent item up to industrial, Customer Service is great. This company is so reliable and super easy to work with and ask questions. One CS agent even stayed after hours to get me an answer!


October 7, 2019

Better than ever - more stock, better prices, quicker shipments, many choices of payment.


August 27, 2019

Heisener has been the best in this industry for many years. Very quick and easy if you know what you are looking for. if you don't know exactly what you are looking for, you are going to be lost.

Yami***** Dixon

August 12, 2019

Very happy for the fast shipping and good price!

Alexz***** Kata

June 1, 2019

Diodes okay. Shipped quick and received with well - packed


May 23, 2019

These are high quality connectors. They work as you would expect them to. There is not much else you can say about them.


April 13, 2019

I wish I had come across Heisener first, no one could help me for 2 days. You are now saved into the TOP of my favorites web list. Thank you very much.


March 12, 2019



February 20, 2019

The order has arrived ahead of time, we appreciate it very much!! Thanks


January 28, 2019

Used this on starter solenoid and works as expected.

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