Datasheet
XL4001
2A 150kHz 40V Buck DC/DC Converter With Constant Current Loop
Pin Configurations
SW 1
SW 2
8 VIN
7 VIN
6 EN
XL4001
3
GND
FB 4
5 CS
Figure2. Pin Configuration of XL4001 (Top View)
Table 1 Pin Description
Pin Number Pin Name Description
Power Switch Output Pin (SW). Output is the switch node that
supplies power to the output.
Ground Pin.(Note: Connected the back exposed PAD to Pin3.)
Feedback Pin (FB). Through an external resistor divider
network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.235V.
1,2
3
SW
GND
4
FB
5
6
CS
EN
Output Current Sense Pin; (Iload=0.155V/Rcs)
Enable Pin. Drive EN pin low to turn on the device, drive it high
to turn it off. Floating is default low.
Supply Voltage Input Pin. XL4001 operates from a 4.5V to 40V
DC voltage. Bypass Vin to GND with a suitably large capacitor
to eliminate noise on the input.
7,8
VIN
Rev 1.2
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