SC2443EVB(2007) Просмотр технического описания (PDF) - Semtech Corporation

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Компоненты Описание

производитель

SC2443EVB
(Rev.:2007)

Dual-Phase Single or Two Output Synchronous Step-Down Controller

Semtech Corporation 

SC2443

Pin Descriptions

Pin #

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

Pin Name

IN1-

COMP1

SYNC

AGND

REF

REFIN

COMP2

IN2-

CS2-

Pin Function

Inverting Input of the Error Amplifier for the Step-down Controller 1.

The Error Amplifier Output for Step-down Controller 1.

Edge-triggered Synchronization Input. When not synchronized, tie this pin to a voltage above 1.5V

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

controllers.

Analog Signal Ground

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

step-down converter 1 is internally connected to this pin

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.

The Error Amplifier Output for Step-down Controller 2.

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

output applications.

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

CS2+

SS2/EN2

AVCC

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

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.

Power Supply Voltage for the Analog Portion of the Controllers.

BST2

Bootstrapped Supply for the High-side Gate Drive 2.

GDH2 Gate Drive Output for the High-side N-channel MOSFET of Output 2.

GDL2 Gate Drive Output for the Low-side N-channel MOSFET of Output 2.

PGND Ground Supply for All the Gate drivers.

PVCC Power Supply Voltage for Low-side MOSFET Drivers.

GDL1 Gate Drive Output for the Low-side N-channel MOSFET of Output 1.

GDH1 Gate Drive Output for the High-side N-channel MOSFET of Output 1.

BST1

SS1/EN1

CS1+

Bootstrapped Supply for the High-side Gate Drive 1.

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

buck converter 1. Pulling this pin below 0.7V shuts off the gate drivers for the first controller.

The Non-inverting Input of the Current-sense Amplifier/Comparator for the Controller 1.

CS1-

The Inverting Input of the Current-sense Amplifier/Comparator for the Controller 1

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

THPAD Solder to the Analog ground plane of the PCB.



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