XL1509 Datasheet, PDF (2/13 Pages) List of Unclassifed Manufacturers – 2A 150KHz 40V Buck DC to DC Converter

2A 150KHz 40V Buck DC to DC Converter
Pin Configurations
Datasheet
XL1509
VIN 1
8 GND
OUTPUT 2
7 GND
XL1509
FEEDBACK ³
6 GND
ON/OFF 4
5 GND
Figure2. Pin Configuration of XL1509 (Top View)
Table 1 Pin Description
Pin Number
1
2
5~8
3
4
Pin Name
VIN
OUTPUT
GND
FEEDBACK
ON/OFF
Description
Supply Voltage Input Pin. XL1509 operates from a 4.5V 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 XL1509.
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.
Rev 2.0
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