SC4212

6

Pin Descriptions

Pin #

Pin Name Pin Function

1,4,5

NC

No connect.

2

EN

Enable Input. Pulling this pin below 0.5V turns the regulator off, reducing the quiescent current to a frac-

tion of its operating value. The device will be enabled if this pin is left open. Connect to VIN if the enable

feature is not being used.

3

VIN

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

Minimum VIN = 1.5V . A large bulk capacitance should be placed close to this pin to ensure that the input

supply does not sag below 1.5V. Also a minimum of 4.7µF ceramic capacitor should be placed directly at

this pin.

6

VOUT

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

pin.

7

FB

When this pin is connected to the VOUT pin , the output voltage will be set to 0.5V . If external feedback

resistors are used , the output voltage will be determined by the resistor ratio (See Application Circuits on

page1):

8

GND

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

T

Thermal Pad

Thermal pad for heatsinking purposes. Not connected internally. Connect to ground plane using multiple

vias.

Block Diagram

Volts

R

)

R

(R

0.5

V

2

2

1

OUT

+

⋅

=

5

5

4

4

3

3

2

2

1

1

D

D

C

C

B

B

A

A

VPUMP

VIN

VIN

VIN

VOUT

Title

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Reference

Thermal

Shutdown

Reverse Voltage

Shutdown

1.5uA

0.5V

FB

GND

VOUT

VIN

EN

RSENSE

RSENSE