EM5103 datasheet(2/12 Pages) CYSTEKEC

2 / 12 page

CYStech Electronics Corp.

Spec. No. : C554QP

Issued Date : 2010.11.17

Revised Date :

Page No. : 2/12

EM5103

CYStek Product Specification

Typical Application Circuit

PSOP-8

DFN3×3-10L

Pin Assignment

Pin No.

Pin Name PSOP-8 DFN3×3-10L

Pin Function

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 22μF 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) × 0.8V (V). This pin has high impedance and should

be kept from noisy source to guarantee stable operation.

GND

Ground.

EM5103 Datasheet(PDF) 2 Page - Cystech Electonics Corp.