Document
XLSEMI
2A 380KHz 18V Buck DC to DC Converter Features
Datasheet XL1513 General Description
The XL1513 is a 380KHz 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. When short protection function happens, the operation frequency will be reduced from 380KHz to 80KHz. An internal compensation block is built in to minimize external component count.
Wide 3.6V to 18V Input Voltage Range Output Adjustable from 0.8V to 16V
Maximum Duty Cycle 100% Minimum Drop Out 0.6V
Fixed 380KHz Switching Frequency 2A Constant Output Current Capability Internal Optimize Power MOSFET High efficiency
Excellent line and load regulation TTL shutdown capability EN pin with hysteresis function
Built in thermal shutdown function Built in current limit function Built in output short protection function Available in SOP8 package
Applications
LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem Telecom / Networking Equipment
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Figure1. Package Type of XL1513
Rev 1.0 1
XLSEMI
2A 380KHz 18V Buck DC to DC Converter Pin Configurations
Datasheet XL1513
FB EN NC VIN
1 2 XL1513 3 4
8 7 6 5
GND GND SW SW
Figure2. Pin Configuration of XL1513 (Top View) Table 1 Pin Description Pin Number 3 4 5,6 Pin Name NC VIN SW Description No Connected. Supply Voltage Input Pin. XL1513 operates from a 3.6V to 18V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. Power Switch Output Pin (SW). Output is the switch node that supplies power to the output. 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 XL1513. Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 0.8V. Enable Pin. Drive EN pin low to turn off the device, drive it high to turn it on. Floating is default high.
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GND
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1 2
FB EN
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Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
2
Rev 1.0
XLSEMI
2A 380KHz 18V Buck DC to DC Converter Function Block
Datasheet XL1513
Figure3. Function Block Diagram of XL1513
Typical Application Circuit
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Efficiency
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Figure4. XL1513 Typical Application Circuit
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Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
3
Rev 1.0
XLSEMI
2A 380KHz 18.