LP3321 Datasheet, PDF (2/9 Pages) Lowpower Semiconductor inc – 1.3MHzFixed-Frequency PWM Operation

Preliminary Datasheet
Functional pin description
LP3321
TSOT-23-5
1
2
3
4
5
TSOT-23-6 _{Pin Name}
1
SW
2
GND
3
FB
Pin Function
Switch Pin. Connect this Pin to inductor and catch diode. Minimize the track
area to reduce EMI.
Ground Pin
Feedback Reference Voltage Pin. Series connect a resistor between WLED
and ground as a current sense. Sense the current feedback voltage to set the
current rating.
4
EN
5
NC
Chip Enable (Active High). Voltage sensing input to trigger the function of
over voltage protection. Note that this pin is high impedance. There should
be a pull low 100kΩ resistor connected to GND when the control signal is
floating.
No connected.
6
Vin
Supply Input Voltage Pin. Bypass 1uF capacitor to GND to reduce the input
noise.
Function Block Diagram
LP3321 – 01 Vesion 1.1 Datasheet Feb.-2011
www.lowpowersemi.com
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