EM5103VT datasheet(2/10 Pages) EXCELLIANCE

2 / 10 page

2011/11/14

Rev.A.8

EM5103

Pin Assignment

Pin Name

Pin No.

Pin Function

PSOP8 DFN3X3-10L

POK

Power OK Indication. POK is an open-drain output. An external pull high

resistor connected to this pin is required.

Enable Input. Pulling the pin below 0.4V turns the regulator off

VIN

7,8,9

Input Voltage. This is the drain input to the power device that supplies

current to the output pin. VIN cannot be forced higher than VCNTL.

CNTL

Supply Input for Control Circuit. CNTL provides supply voltage to the control

circuitry and driver for the pass transistor. The driving capability of output

current is proportioned to the VCNTL. For the device to regulate, the voltage on

this pin must be at least 2.0V greater than the output voltage, and no less

than VCNTL_MIN.

No Connection inside chip.

VOUT

1,2,3

Output Voltage. VOUT is power output pin. An internal pull low resistance

exists when the device is disabled. Minimum 22uF low ESR ceramic holding

capacitor is required at this pin for stabilizing VOUT voltage.

Feedback Voltage. FB is the inverting input to the error amplifier. A resistor

divider from the output to GND is used to set the regulation voltage as

VOUT = (1 + R1/R2) x 0.8V (V). This pin has high impedance and should be kept

from noisy source to guarantee stable operation.

GND

Ground.

Function Block Diagram

Power On

Reset

Delay

Thermal

Protection

Current

Limit

0.8V

0.72V

VOUT

POK

VIN

Control

Logic

Soft Start

GND

Voltage

Reference

CNTL

0.8V

0.72V

ZEN

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