5A 300KHz 32V Buck DC to DC Converter XL4005
n Wide 5V to 32V Input Voltage Range n Output Adjustable from 0.8V to 30V
n Maximum Duty Cycle 100% n Minimum Drop Out 0.6V
n Fixed 300KHz Switching Frequency n 5A Constant Output Current Capability n Internal Optimize Power MOSFET n High e
n Excellent line and load regulation n TTL shutdown capability
n EN pin with hysteresis function
n
Built in thermal shutdown function n Built in current limit function
n Built in output short protection function n Available in TO-263 package
Applications
n LCD Monitor and LCD TV n Digital Photo Frame n Set-up Box n ADSL Modem
n
Telecom / Networking Equipment
General Description
The XL4005 is a 300KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 5A 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. When short protection function happens, the operation frequency will be reduced from 300KHz to 60KHz. An internal compensation block is built in to minimize external component count.
Figure1. Package Type of XL4005
5A 300KHz 32V Buck DC to DC Converter
XL4005
Pin Configurations
Figure2. Pin Configuration of XL4005 (Top View) Table 1 Pin Description
Pin Number Pin Name Description
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供配电系统
1 GND Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL4005.
2 FB Feedback Pin (FB). Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 0.8V.
3 SW Power Switch Output Pin (SW). SW is the switch node that supplies power to the output.
4 EN Enable Pin. Drive EN pin high to turn on the device, drive it low to turn it off.
5 VIN Supply V oltage Input Pin. XL4005 operates from a 5V to 32V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
5A 300KHz 32V Buck DC to DC Converter
XL4005
Function Block
Figure3. Function Block Diagram of XL4005
骨碎补总黄酮Typical Application Circuit
Figure4. XL4005 Typical Application Circuit 24V~5V/5A
5A 300KHz 32V Buck DC to DC Converter XL4005 Ordering Information
Order Information Marking ID Package Type Packing Type Supplied As
XL4005E1 XL4005E1 TO263-5L 800 Units on Tape & Reel
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
Absolute Maximum Ratings（Note1）
Parameter Symbol Value Unit Input Voltage Vin -0.3 to 35 V Feedback Pin Voltage V FB-0.3 to Vin V
EN Pin Voltage V EN-0.3 to Vin V Output Switch Pin Voltage V Output-0.3 to Vin V Power Dissipation P D Internally limited mW Thermal Resistance (TO263)
R JA30 ºC/W (Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature T J-40 to 125 ºC Storage Temperature T STG-65 to 150 ºC Lead Temperature (Soldering, 10 sec) T LEAD260 ºC ESD (HBM) 2000 V Note1: Stresses greater than th
ose 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.
5A 300KHz 32V Buck DC to DC Converter XL4005 XL4005 Electrical Characteristics
T a = 25℃;unless otherwise specified.
Symbol Parameter Test Condition Min. Typ. Max. Unit System parameters test circuit figure4
VFB Feedback
V oltage
Vin = 5V to 32V, V out=5V
Iload=0.5A to 5A
0.776 0.8 0.824 V
Efficiency ŋVin=12V ,V out=5V
Iout=5A
- 90 - %
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, T a = 25℃; the others floating unless otherwise specified.
Parameters Symbol Test Condition Min. Typ. Max. Unit Input operation voltage Vin 5 32 V Shutdown Supply Current I STBY V EN=0V 60 200 uA
Quiescent Supply Current I q V EN =2V,
V FB =Vin
3 5 mA血红蛋白浓度
Oscillator Frequency Fosc 240 300 360 Khz Switch Current Limit I L V FB =0 8 A
EN Pin Threshold V EN High (Regulator ON)
Low (Regulator OFF)
1.4
0.8
V
I H V EN =2V (ON) 1 15 uA EN Pin Input Leakage
Current I
L
V EN =0V (OFF) 1 15 uA Max. Duty Cycle D MAX V FB=0V 100 %
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