SC173A View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC173A' PDF : 26 Pages View PDF
SC173A
Pin Descriptions (MLPD-10)
Pin #
1
2
3
4
5
6
7
8
9
10
Pin Name
BST
VIN
Pin Function
Bootstrap pin. A capacitor is connected between BST to LX to develop the floating voltage for the
high-side gate drive.
Power input supply voltage.
LX
PGND
PGOOD
FB
EN
Switching (Phase) node.
Power ground.
Open-drain Power Good indicator. High impedance indicates power is good. An external pull-up
resistor is required.
Feedback input for switching regulator. Connect to an external resistor divider from the output to
program the output voltage.
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.
TON
AGND
VDD
PAD
On-time set input. Set the on-time by a series resistor to AGND.
Analog Ground.
Input power for internal control circuit. Needs at least 2.2mF decoupling capacitor from this pin to
AGND.
Thermal pad for heatsinking purposes. Connect to ground plane using multiple vias. Not con-
nected internally.
© 2010 Semtech Corporation
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