ACT111A
Rev 0, 14-Feb-11
ORDERING INFORMATION
PART NUMBER
ACT111AUS-T
TEMPERATURE RANGE
-40°C to 85°C
PACKAGE
SOT23-6
PINS
6
PACKING
TAPE & REEL
TOP MARK
FRWE
PIN CONFIGURATION
FB
1
6
DIM
FRWE
G
2
5
IN
BST
3
4
SW
SOT23-6
ACT111AUS-T
PIN DESCRIPTIONS
PIN NUMBER
1
2
3
4
5
6
PIN NAME
FB
G
BST
SW
IN
DIM
PIN DESCRIPTION
Feedback Input for regulating LED current. The voltage at this pin is regulated to
0.1V. An external resistor is connected from this pin to ground to sense the LED
current.
Ground.
Bootstrap pin. This provides power to the internal high-side N channel MOSFET
gate driver. Connect a 2.2nF capacitor from the pin to SW pin.
Internal N channel power MOSFET source output pin. Connect it to one end of
power inductor.
Power supply input. Bypass this pin with a 10µF ceramic capacitor to GND, placed
as close to the IC as possible.
PWM signal input for dimming control. Apply PWM signal with amplitude greater
than 2V to this pin. The device is enabled as DIM pin open and disabled when it is
connected to G.
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TM
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