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SC173A Datasheet(PDF) 6 Page - Semtech Corporation

Part # SC173A
Description  3A EcoSpeedTM Synchronous Step-Down Regulator with Automatic Power Save
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC173A Datasheet(HTML) 6 Page - Semtech Corporation

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© 2010 Semtech Corporation
Pin Descriptions (MLPD-10)
Pin #
Pin Name
Pin Function
1
BST
Bootstrap pin. A capacitor is connected between BST to LX to develop the floating voltage for the
high-side gate drive.
2
VIN
Power input supply voltage.
3
LX
Switching (Phase) node.
4
PGND
Power ground.
5
PGOOD
Open-drain Power Good indicator. High impedance indicates power is good. An external pull-up
resistor is required.
6
FB
Feedback input for switching regulator. Connect to an external resistor divider from the output to
program the output voltage.
7
EN
Enable input for the switching regulator. Pull EN above 1V or float it to enable the part with auto-
matic power save mode enabled. Connect EN to AGND to disable the switching regulator.
8
TON
On-time set input. Set the on-time by a series resistor to AGND.
9
AGND
Analog Ground.
10
VDD
Input power for internal control circuit. Needs at least 2.2mF decoupling capacitor from this pin to
AGND.
PAD
Thermal pad for heatsinking purposes. Connect to ground plane using multiple vias. Not con-
nected internally.
6
SC173A


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