XL1509 datasheet

2A 150KHz 40V Buck DC to DC Converter XL1509

Features

Wide 4.5V to 40V Input Voltage Range 3.3V,5V,12V, and adjustable versions Output Adjustable from 1.23V to 37V

Maximum Duty Cycle 100% Minimum Drop Out 1.5V

Fixed 150KHz Switching Frequency 2A Constant Output Current Capability Internal Optimize Power Transistor High e fficiency

Excellent line and load regulation TTL shutdown capability

ON/OFF pin with hysteresis function Built in thermal shutdown function Built in current limit function Built in second current limit function Available in SOIC8 package

Applications

LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem

Telecom / Networking Equipment

General Description

The XL1509 is a 150 KHz 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 second current limit function happens, the operation frequency will be reduced from 150KHz to 50KHz. An internal compensation block is built in to minimize external component count.

Figure1. Package Type of XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509

Figure4. XL1509 Typical Application Circuit 12V-5V/2A

2A 150KHz 40V Buck DC to DC Converter XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509

LOCATE THE PROGRAMMING RESISTORS NEAR

2A 150KHz 40V Buck DC to DC Converter XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509

2A 150KHz 40V Buck DC to DC Converter XL1509 Figure6. XL1509-3.3 System Parameters Test Circuit

Figure7. XL1509-5.0 System Parameters Test Circuit

2A 150KHz 40V Buck DC to DC Converter XL1509 Figure8. XL1509-12 System Parameters Test Circuit

Figure9. XL1509-ADJ System Parameters Test Circuit

2A 150KHz 40V Buck DC to DC Converter XL1509 Package Information

SOP8 Package Mechanical Dimensions