XL4001

2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop XL4001

Features

n Wide 4.5V to 40V Input Voltage Range n Output Adjustable from 1.235V to 37V

n Minimum Drop Out 1.5V

General Description

The XL4001 is a 150KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 2A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An enable function, an over current protection function is built inside. An internal compensation block is built in to minimize external component count.

n Fixed 150kHz Switching Frequency n 2A Constant Output Current Capability n Internal Optimize Power Transistor

n n n n n

Excellent line and load regulation TTL shutdown capability

ON/OFF pin with hysteresis function With output constant current loop

Built in thermal shutdown function n Built in current limit function

n Built in output over voltage protection n SOP8-EP (Exposed PAD) package

Applications

n Car Charger n Battery Charger

n LED Constant Current Driver

Figure1. Package Type of XL4001

Rev 1.2 www.xlsemi.com

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Datasheet

2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop XL4001

Pin Configurations

SWSWGNDFB

12XL40013465ENCS

87VINVIN

Figure2. Pin Configuration of XL4001 (Top View)

Table 1 Pin Description

Pin Number

1,2 3 4 5 6 7,8

Pin Name Description

Power Switch Output Pin (SW). Output is the switch node that SW

supplies power to the output.

GND Ground Pin.(Note: Connected the back exposed PAD to Pin3.) Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. FB

The feedback threshold voltage is 1.235V.

CS Output Current Sense Pin; (Iload=0.155V/Rcs) Enable Pin. Drive EN pin low to turn on the device, drive it high EN

to turn it off. Floating is default low.

Supply Voltage Input Pin. XL4001 operates from a 4.5V to 40V DC voltage. Bypass Vin to GND with a suitably large capacitor VIN

to eliminate noise on the input.

Rev 1.2 www.xlsemi.com

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Datasheet

2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop XL4001

Function Block

Figure3. Function Block Diagram of XL4001

Typical Application Circuit (Car Charger)

Figure4. XL4001 Typical Application Circuit (Li Battery Charger)

Rev 1.2 www.xlsemi.com

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Datasheet

2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop XL4001

Typical Application Circuit (Buck LED Constant Current Driver)

ENFBVIN467,8XL40011,2SW35CSGNDVOUTR2 LED 1W~5WL 33uhD1 1N5821COUT 100uf/35V+6V~36VCINC1 100uf/50V105R1 1KRcsFigure5. XL4001 Typical Application Circuit (LED Constant Current Driver)

Ordering Information

Package

Temperature Range

Part Number Lead Free XL4001E1 XL4001TRE1 Marking ID Lead Free XL4001E1 XL4001E1 Packing Type Tube Tape & Reel XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant. Absolute Maximum Ratings（Note1）

Parameter

Symbol

Input Voltage Vin FB Pin Voltage VFB EN Pin Voltage VEN SW Pin Voltage VSW Power Dissipation PD Thermal Resistance 60 ºC/W RJA

(Junction to Ambient, No Heatsink, Free Air) Operating Junction Temperature -40 to 125 ºC TJ Storage Temperature -65 to 150 ºC TSTG Lead Temperature (Soldering, 10 sec) 260 ºC TLEAD ESD (HBM) 2000 V

Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Rev 1.2 www.xlsemi.com

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Value -0.3 to 45 -0.3 to Vin -0.3 to Vin -0.3 to Vin Internally limited Unit V V V V mW

Datasheet

2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop XL4001

XL4001 Electrical Characteristics

Ta = 25℃;unless otherwise specified. Symbol

Parameter

Test Condition

Min. Typ. Max. Unit

System parameters test circuit figure4 VFB Efficiency

Feedback Voltage

Vin = 8V to 32V, Vout=5V Iload=0.2A to 2A Vin=12V ,Vout=5V Iout=2A

1.21 1.235 1.26 -

83

-

V %

ŋ

Electrical Characteristics (DC Parameters)

Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta = 25℃; the others floating unless otherwise specified.

Parameters Input operation voltage Shutdown Supply Current Quiescent Supply Current Oscillator Frequency Switch Current Limit EN Pin Threshold Output Saturation Voltage Constant current sense Voltage Symbol Vin ISTBY Iq Fosc IL VEN VCE VCS

Test Condition

VEN=5V VEN =0V, VFB =Vin

VFB =0

High (Regulator OFF) Low (Regulator ON)

VFB=0V ISW=2A

Min. Typ. Max. Unit 4.5 127

80 2 150 3 1.4 0.8 1.1

40 200 5 172 1.4

V uA mA Khz A V V V

0.140 0.155 0.170

Rev 1.2 www.xlsemi.com

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Datasheet

2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop XL4001

Schottky Diode Selection Table

Current Surface

Mount

1A

3A

√ √ √ √ √ √

1N5820 MBR320 SK32 SR302 1N5821 MBR330 SK33 30WQ03 31DQ03 SR303 1N5822 SK34

SK35

MBR360 SK36 SR306 MBR340 MBR350 30WQ04 30WQ05 31DQ04 31DQ05 SR304 SR305 Through VR (The same as system maximum input voltage)

Hole 20V 30V 40V 50V 60V 1N5817 1N5818 1N5819 √

Rev 1.2 www.xlsemi.com

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Datasheet

2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop XL4001

Package Information (SOP8-EP)

Rev 1.2 www.xlsemi.com

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