SC187

Pin Descriptions

Pin #

Pin Name

Pin Function

1, 16

PVIN

Input supply voltage for the converter power stage

2

AGND

Ground connection for the internal circuitry — AGND needs to be connected to PGND directly.

3

AVIN

Power supply for the internal circuitry — AVIN is required to be connected to PVIN through an R-C filter of 1Ω

and 10nF.

4, 5, 6, 7

CTLx

Control bit — see Table 1 for decoding. These pins have 500kΩ internal pull-down resistors which are switched

in circuit whenever CTLx is low or when the part is in under-voltage lockout.

8

PGOOD

Power good indicator — when the output voltage reaches the PGOOD threshold, this pin will be open-drain

(after the PGOOD delay), otherwise, it is pulled low internally.

9

SS

Soft Start — Connect a soft-start capacitor to program the soft start time. There is a 5µA charging current

flowing out of the pin.

10

VOUT

Output voltage sense pin

11,12,13

PGND

Ground connection for converter power stage

14,15

LX

Switching node — connect an inductor between this pin and the output capacitor.

T

Thermal Pad

Thermal pad for heat sinking purposes — recommend to connect to PGND. It is not connected internally.

5