SC286

Pin Descriptions

Pin #

Pin Name

Pin Function

1, 2

PVINA

Input supply voltage for the converter power stage

3

AGNDA

Ground connection for the internal circuitry — AGNDA needs to be connected to PGNDA directly.

4

AVINA

Power supply for the internal circuitry — AVINA is required to be connected to PVINA through an R-C filter of

1Ω and 100nF.

5, 6, 7, 8

CTL

XA

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

into the circuit whenever CTL

9

PGOODA

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

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

10

SSA

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

flowing out of the pin.

11

VOUTA

Output voltage sense pin

12

PGNDB

Ground connection for converter power stage

13, 14

LXB

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

15, 16

PVINB

Input supply voltage for the converter power stage

17

AGNDB

Ground connection for the internal circuitry — AGNDB needs to be connected to PGNDB directly.

18

AVINB

Power supply for the internal circuitry — AVINB is required to be connected to PVINB through an R-C filter of

1Ω and 100nF.

19, 20, 21, 22

CTL

XB

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

into the circuit whenever CTL

23

PGOODB

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

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

24

SSB

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

flowing out of the pin.

25

VOUTB

Output voltage sense pin

26

PGNDA

Ground connection for converter power stage

27, 28

LXA

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