ACT4088
Rev0, 13-May-08
ORDERING INFORMATION
PART NUMBER
ACT4088US-T
TEMPERATURE RANGE
-40°C to 85°C
PACKAGE
SOT23-6
PINS
6
PACKING
TAPE & REEL
TOP MARK
FRWJ
PIN CONFIGURATION
SW
1
6
BST
IN
2
ACT4088
5
G
EN
3
4
FB
SOT23-6
PIN DESCRIPTIONS
PIN NUMBER
1
2
3
4
5
6
PIN NAME
SW
IN
EN
FB
G
BST
PIN DESCRIPTION
Switch Output. Connect this pin to the switching end of the inductor.
Power supply input. Bypass this pin with a 10µF ceramic capacitor to G, placed as
close to the IC as possible.
Enable Input. EN is pulled up to 5V with a 2µA current, and contains a precise 1.24V
logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC.
Drive to a logic-low to disable the IC and enter micro-power shutdown mode.
Feedback Input. The voltage at this pin is regulated to 0.81V. Connect to the center
point of a resistive voltage-divider between OUT and G to set the output voltage.
Ground and Heat sink. Connect this pin to a large, uncovered PCB copper area for
best heat dissipation.
Bootstrap. This pin acts as the power supply for the high-side switch’s gate driver.
Connect a 22nF capacitor between this pin and SW.
Innovative Power
TM
-2-
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Copyright © 2008 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
