ACT4082A
Active- Semi
Rev0, 16-May-08
ORDERING INFORMATION
PART NUMBER TEMPERATURE RANGE
PACKAGE
PINS
PACKING
TOP MARK
ACT4082AUS-T
-40°C to 85°C
SOT23-6
6
TAPE & REEL
FMGD
PIN CONFIGURATION
6
5
1
2
SW
IN
BST
G
ACT4082A
EN
4
3
FB
SOT23-6
PIN DESCRIPTIONS
PIN NUMBER PIN NAME
PIN DESCRIPTION
1
SW
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.
2
IN
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.
3
EN
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.
4
5
6
FB
G
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.
BST
Innovative PowerTM
- 2 -
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ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
