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SS9175/6

PIN DESCRIPTIONS

Pin No.

Symbol

Function

Description

1 (1)

PWRGD

Power-good

Output of the error amplifier and input to the PWM comparator. It is used for feedback

loop compensation.

2 (2)

IN1

Feedback

Inverting input of the error amplifier. It is normally connected to the switching power

supply output through a resistor divider.

3 (3)

COMP1

Compensation

Output of the error amplifier and input to the PWM comparator. It is used for feedback

loop compensation.

4 (4)

VCC

Power Supply

Supply voltage input.

5

CL1+

Over-current

Over-current adjustment and high-side MOSFET supply voltage sense pin. Connect

a resistor from this pin to high-side supply voltage.

6

CL1-

Over-current

Over-current sense pin.

7 (5)

BST1

Boost supply

Supply for high-side driver. Connect to bootstrap circuit.

8 (6)

DH1

High-side drive

High-side MOSFET gate driver pin.

9 (7)

DL1

Low-side drive

Low-side MOSFET gate driver pin.

10 (8)

PGND

Driver ground

Driver circuit GND supply. Connect to MOSFET’s GND.

11 (9)

BSTC

Buffered supply

Voltage supply for internal low-side driver circuit and for high-side bootstrap circuit’s

diode input. Its output is 6V if chip supply voltage VCC > 6.5V. If VCC < 6.5V, then BSTC

= VCC. Need a 10uF decoupling capacitor connected to PGND.

12 (10)

DL2

Low-side drive

Low-side MOSFET gate driver pin.

13 (11)

DH2

High-side drive

High-side MOSFET gate driver pin.

14 (12)

BST2

Boost supply

Supply for high-side driver. Connect to bootstrap circuit.

15 (13)

CL2-

Over-current

Over-current sense pin.

16 (14)

CL2+

Over-current

Over-current adjustment and high-side MOSFET supply voltage sense pin. Connect a

resistor from this pin to high-side supply voltage.

17 (15)

SS/EN

Soft-start/Enable

A 25uA internal current source charges an external capacitor for soft start. Pull down this

pin to disable the chip.

18

COMP2

[NC]

Compensation

Output of the error amplifier and input to the PWM comparator. It is used for feedback

loop compensation.

19

IN2 [NC]

Feedback

Inverting input of the error amplifier. It is normally connected to the switching power

supply output through a resistor divider.

20 (16)

GND

Control ground

Control circuit GND supply.

Note: Inside ( ) is the pin assignment for SS9176CS. Inside [ ] is for SS9175CS.

PIN CONFIGURATIONS

PWRGD

PGND

DL1

DH1

BST1

CL1+

CL1

VCC

COMP1

IN1

1

10

9

8

7

6

5

4

3

2

20

11

12

13

14

15

16

17

18

19

SS/ENB

IN2

GND

BSTC

DL2

DH2

BST2

CL2-

CL2+

COMP2

SS/ENB

PGND

DL1

DH1

BST1

PWRGD

VCC

COMP

IN

GND

BSTC

DL2

DH2

BST2

CL2-

CL+

10

9

11

12

13

14

15

16

1

8

7

6

5

4

3

2

SS9175

SS9176

Rev.2.02 12/29/2003

PRELIMINARY