sc171mltr Semtech Corporation, sc171mltr Datasheet - Page 6

• Manufacturer Part Number: sc171mltr
• Description: 1a Ecospeedtm Synchronous Step-down Regulator With Optional Ultrasonic Power Save
• Manufacturer: Semtech Corporation

Pin Descriptions (MLPD-10)
© 2010 Semtech Corporation
Pin #
10
1
2
3
4
5
6
7
8
9
Pin Name
PGOOD
EN/PSV
AGND
PGND
TON
VDD
PAD
BST
VIN
LX
FB
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.
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.
Tri-state pin. Enable input for switching regulator. Pull EN/PSV high to enable the part with power
save mode enabled. Connect EN/PSV to AGND to disable the switching regulator. Leave EN/PSV
floating to enable the IC in forced continuous conduction mode.
On-time set input. Set the on-time by a series resistor to AGND
Analog Ground.
Input power for internal control circuit. Needs 1mF decoupling capacitor from this pin to AGND.
Thermal pad for heatsinking purposes. Connect to ground plane using multiple vias. Not con-
nected internally.
Pin Function
.
SC171
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