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XLSEMI

XL2596 Datasheet Preview

XL2596 Datasheet

3A 150KHz 40V Buck DC to DC COnverter

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XLSEMI
3A 150KHz 40V Buck DC to DC Converter
Features
„ Wide 3.6 to 40V Input Voltage Range
„ 3.3V,5V,12V, and adjustable versions
„ Output Adjustable from 1.23V to 38V
„ Maximum Duty Cycle 100%
„ Minimum Drop Out 1.3V
„ Fixed 150KHz Switching Frequency
„ 3A Constant Output Current Capability
„ Internal Optimize Power Transistor
„ Up to 90% Efficiency
„ Excellent line and load regulation
„ TTL shutdown capability
„ Built in Frequency Compensation
„ Built in Soft Start Function
„ Built in Thermal Shutdown Function
„ Built in Current Limit Function
„ Built in Short Protection Function
„ Available in TO-220,TO-263 packages
Applications
„ LCD Monitor and LCD TV
„ Digital Photo Frame
„ Set-up Box
„ ADSL Modem
„ Telecom / Networking Equipment
Datasheet
XL2596
General Description
The XL2596 is a 150 KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 3A 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
and a short circuit protection function are
built inside. When OCP or SCP happens, the
operation frequency will be reduced from
150KHz to 30KHz. An internal compensation
block is built in to minimize external
component count.
2006 Rev 1.2
Figure1. Package Type of XL2596
1
www.xlsemi.com




XLSEMI

XL2596 Datasheet Preview

XL2596 Datasheet

3A 150KHz 40V Buck DC to DC COnverter

No Preview Available !

www.DataSheet4U.com
XLSEMI
3A 150KHz 40V Buck DC to DC Converter
Pin Configurations
Datasheet
XL2596
Figure2. Pin Configuration of XL2596 (Top View)
Table 1 Pin Description
Pin Number
1
2
3
4
5
Pin Name
Vin
Output
GND
Feedback
ON/OFF
Description
Supply Voltage Input Pin. XL2596 operates from a 3.6V to 40V
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 XL2596.
Feedback Pin (FB). Through an external resistor divider
network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.23V.
Enable Pin. Drive ON/OFF pin low to turn on the device, drive
it high to turn it off. Floating is default low.
2006 Rev 1.2
www.xlsemi.com
2


Part Number XL2596
Description 3A 150KHz 40V Buck DC to DC COnverter
Maker XLSEMI
Total Page 14 Pages
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