© 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/PSV

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.

8

TON

9

AGND

Analog Ground.

10

VDD

Input power for internal control circuit. Needs 1mF 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

SC174