SC2443

9

Pin Descriptions

Pin #

Pin Name

Pin Function



IN-

Inverting Input of the Error Amplifier for the Step-down Controller .

2

COMP

The Error Amplifier Output for Step-down Controller .

3

SYNC

Edge-triggered Synchronization Input. When not synchronized, tie this pin to a voltage above .5V

or the ground. An external clock (frequency > frequency set with ROSC) at this pin synchronizes the

controllers.

4

AGND

Analog Signal Ground

5

REF

Buffered Output of the Internal 0.5V Reference. The non-inverting input of the error amplifier for the

step-down converter  is internally connected to this pin

6

REFIN

An external Reference voltage is applied to this pin.The non-inverting input of the error amplifier for

the step-down converter 2 is internally connected to this pin.

7

COMP2

The Error Amplifier Output for Step-down Controller 2.

8

IN2-

Inverting Input of the Error Amplifier for the Step-down Controller 2. Tie to AVCC for two-phase single

output applications.

9

CS2-

The Inverting Input of the Current-sense Amplifier/Comparator for the Controller 2.

0

CS2+

The Non-inverting Input of the Current-sense Amplifier/Comparator for the Controller 2.



SS2/EN2

An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off time for

step-down converter 2. Pulling this pin below 0.7V shuts off the gate drivers for the second controller.

Leave open for two-phase single output applications.

2

AVCC

Power Supply Voltage for the Analog Portion of the Controllers.

3

BST2

Bootstrapped Supply for the High-side Gate Drive 2.

4

GDH2

Gate Drive Output for the High-side N-channel MOSFET of Output 2.

5

GDL2

Gate Drive Output for the Low-side N-channel MOSFET of Output 2.

6

PGND

Ground Supply for All the Gate drivers.

7

PVCC

Power Supply Voltage for Low-side MOSFET Drivers.

8

GDL

Gate Drive Output for the Low-side N-channel MOSFET of Output .

9

GDH

Gate Drive Output for the High-side N-channel MOSFET of Output .

20

BST

Bootstrapped Supply for the High-side Gate Drive .

2

SS/EN

An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off time for

buck converter . Pulling this pin below 0.7V shuts off the gate drivers for the first controller.

22

CS+

The Non-inverting Input of the Current-sense Amplifier/Comparator for the Controller .

23

CS-

The Inverting Input of the Current-sense Amplifier/Comparator for the Controller 

24

ROSC

An external resistor connected from this pin to GND sets the oscillator frequency

THPAD

Solder to the Analog ground plane of the PCB.