SC4510 查看數據表（PDF） - Semtech Corporation

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SC4510

High Performance Synchronous Buck Controller With Reference Tracking

Semtech Corporation 

SC4510

POWER MANAGEMENT

Pin Descriptions

Pin #

1

Pin Name

REF

Internal 0.5V bandgap reference

Pin Function

2

REFIN Non inverting input of the error amplifier. Can be connected to REF pin or an external voltage

such as VDDQ/2. Maximum input range is 3V

3

REFOUT Buffered reference output fro external use. Tracks the REFIN voltage

4

CS+

Current sense input +ve

5

CS-

Current sense input -ve. Typically connected to the VOUT end of the output inductor.

6

PGOOD Power Good output signal. Open collector output goes low under fault and sinks up to 5 mA.

Monitors the output at thresholds of + 12% with respect to REFIN voltage.

7

AVCC Supply voltage for internal analog circuits.

8

PVCC Supply voltage for output drivers. Bypass with a large ceramic capacitor to PGND.

9

GDL

Gate drive output for the low side N-Channel MOSFET.

10

PGND Power ground for returning the drive currents.

11

GDH

Gate drive output for the high side N-Channel MOSFET.

12

BST

Boost capacitor connection for the high side gate drive.

Connect an external capacitor and a diode as shown in the Typical Application Circuit.

13

VPN

Virtual Phase Node. Auxiliary pin used for virtual current sense.Connect an RC between this

pin and the VOUT end of the output inductor to sense the integrated current feedback signal.

14

VIN

Input supply for the virtual current sense circuit.

This should be at the same potential as the drain of the high side power MOSFET.

15

SS/EN Soft Start and Enable pin. Grounding the pin shuts down the controller. Connect a capacitor to

soft start the output.The output will start switching when the SS pin voltage goes above 0.5V.

16

ROSC Connect a resistor to AGND to program the oscillator frequency.

17

IN-

Inverting feedback input for the error amplifier. Follows the reference input provided at the

REFIN pin. Maximum voltage range is 3V.

18

COMP Error amplifier output for compensation.

19

SYNC Pin for external synchronisation signal input

20

AGND Analog signal ground. Return the ground connections of noise sensitive components such as

ROSC, soft start capacitor, sync signal, feedback resistor chain and feedback compensation

components separately to this pin.

© 2004 Semtech Corp.

5

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