SC4217 데이터 시트보기 (PDF) - Semtech Corporation

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SC4217

Very Low Input /Very Low Dropout 3 Amp Regulator With Enable

Semtech Corporation 

SC4217

Pin Descriptions

Pin #

1

Pin Name Pin Function

Enable input. Pulling this pin below 0.4V turns off the regulator reducing the quiescent current to a franction

EN

of its operating value. The device will be enabled if this pin is left open. Connect to VIN if not being used.

Input voltage. For regulation at full load, the input to this pin must be between (VO+0.5V) and 5.5V. Minimum

2

VIN

VIN = 1.8V. A large bulk capacitance should be placed closey to this pin to ensure that the input supply does

not sag below 1.8V. A minimum of 4.7µF ceramic capacitors should be placed directly at this pin.

3

GND

Reference ground. The GND pin and the exposed die pad must be connected together at the IC pin.

4

VO

The pin is the power output of the device. A minimum of 10µF capactor should be placed directly at this pin.

Use external feedback resistors to program the output voltage. See application circuit on page 1.

5

ADJ

VO= [(R2+R1)*1.24V]/R2. The ADJ pin cannot be tied directly either to VO pin or to GND pin.

THERMAL

T

PAD

Thermal pad should be connected to PCB ground plane for thermal and electrical purposes.

Block Diagram

RSense

VIN

Current Limit

Reference

VDD

1.5uA

EN

VPump

Thermal

Shutdown

VOUT

VIN

Reverse Voltage

Shutdown

1.24V

REF

VO

ADJ

GND



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