SC4217_09 datasheet(5/11 Pages) SEMTECH

5 / 11 page

SC4217

Pin Descriptions

Pin #

Pin Name

Pin Function

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

of its operating value. The device will be enabled if this pin is left open. Connect to V

IN if not being used.

VIN

Input voltage. For regulation at full load, the input to this pin must be between (V

O+0.5V) and 5.5V. Minimum

IN = .8V. A large bulk capacitance should be placed closey to this pin to ensure that the input supply does

not sag below .8V. A minimum of 4.7µF ceramic capacitors should be placed directly at this pin.

GND

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

The pin is the power output of the device. A minimum of 0µF capactor should be placed directly at this pin.

ADJ

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

O= [(R2+R)*.24V]/R2. The ADJ pin cannot be tied directly either to VO pin or to GND pin.

THERMAL

PAD

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

1.5uA

Reverse Voltage

Shutdown

Thermal

Shutdown

VOUT

VIN

1.24V

REF

VDD

Current Limit

Reference

VPump

RSense

VIN

GND

ADJ

Block Diagram

SC4217 Datasheet(PDF) 5 Page - Semtech Corporation