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ACT4050YH-T Datasheet(PDF) 2 Page - Active-Semi, Inc

Part # ACT4050YH-T
Description  Wide Input 3.5A Step Down Converter
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Manufacturer  ACTIVE-SEMI [Active-Semi, Inc]
Direct Link  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT4050YH-T Datasheet(HTML) 2 Page - Active-Semi, Inc

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Active-Semi
ACT4050
Rev 2, 01-Jul-11
- 2 -
www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
Innovative Power
TM
ORDERING INFORMATION
PART NUMBER
TEMPERATURE RANGE
PACKAGE
PINS
PACKING
ACT4050YH
-40°C to 85°C
SOP-8/EP
8
TUBE
ACT4050YH-T
-40°C to 85°C
SOP-8/EP
8
TAPE & REEL
PIN CONFIGURATION
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
1
BS
Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Connect
a 10nF capacitor between BS and SW.
2
IN
Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Capacitor in
the Application Information section.
3
SW
Switch Output. Connect this pin to the switching end of the inductor.
4
GND
Ground.
5
FB
Feedback Input. The voltage at this pin is regulated to 0.817V. Connect to the resistor
divider between output and ground to set output voltage.
6
COMP
Compensation Pin. See Stability Compensation in the Application Information section.
7
EN
Enable Input. When higher than 1.3V, this pin turns the IC on. When lower than 0.9V, this
pin turns the IC off. Output voltage is discharged when the IC is off. When left
unconnected, EN is pulled up to 4.5V typical with a 2µA pull-up current.
8
N/C
Not Connected.
EP
EP
Exposed Pad shown as dashed box. The exposed thermal pad should be connected to
board ground plane and pin 4. The ground plane should include a large exposed copper
pad under the package for thermal dissipation (see package outline). The leads and
exposed pad should be flush with the board, without offset from the board surface.
SOP-8/EP


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