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SC2463TSTRT

High Performance Quad Output Switching Regulator

Semtech Corporation 

SC2463

POWER MANAGEMENT

Pin Descriptions (Cont.)

Pin # Pin Name

Pin Function

16

AVCC This pin is connected to the output of the external linear regulator to supply the IC. The IC may

be powered directly from a single 5V (±10%) supply at this pin but low-shutdown-current is lost.

The pin must be always decoupled to AGND with a minimum of 1uF ceramic capacitor, place

very close to the pin.

17

BST2

The pin powers the upper MOSFET driver of PWM switcher2. Connect this pin to the junction

of the bootstrap capacitor and cathode of the bootstrap diode. The anode of the bootstrap

diode is connected to the PVCC.

18

GD2H Switcher2 upper MOSFET gate driver output. It swings between BST2 and PH2.

19

PH2

The pin is connected to the junction of the upper MOSFET's source, output inductor and lower

MOSFET's drain.

20

GD2L Switcher2 lower MOSFET gate driver output. It swings between PVCC and PGND.

21

PGND The pin provides the power ground for the lower gate drivers for both PWM switchers. It should

be connected to the sources of the lower MOSFETs and the negative terminal of the input

capacitors.

22

PVCC This pin is connected to the output of the external linear regulator to supply the internal lower

gate drivers for both PWM switchers. It may be powered directly from a single 5V (±10%)

supply at this pin but low-shutdown-current is lost. The pin must be always decoupled to PGND

with a minimum of 10uF ceramic capacitor, place very close to the pin.

23

GD1L Switcher1 lower MOSFET gate driver output. It swings between PVCC and PGND.

24

PH1

The pin is connected to the junction of the upper MOSFETs source, output inductor and lower

MOSFETs drain.

25

GD1H Switcher1 upper MOSFET gate driver output. It swings between BST1 and PH1.

26

BST1

The pin powers the upper MOSFET driver of PWM switcher1. Connect this pin to the junction

of the bootstrap capacitor and cathode of the bootstrap diode. The anode of the bootstrap

diode is connected to the PVCC.

27

VIN

The pin is internally connected to the pull-up resistor of an N-channel MOSFET to regulate the

bias for the IC.

28

BDI

The external bias pass PNP transistor driver. Internally connected to the drain of an N-channel

MOSFET.

 2007 Semtech Corp.

8

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