2013/08/30

A.1

2

EM5049

Pin Assignment

Pin Name

Pin No.

Pin Function

EN

1

Enable. Active high control pin. If this pin is floating, an internal pull high current

source (3uA typical) will enable the regulator. Pulling the pin below 0.4V turns the

regulator off.

FB

2

Feedback. The inverting input pin of error amplifier.

VOUT

3,4,5

Output Voltage. VOUT is power output pin. Minimum 10uF low ESR ceramic

capacitor is required at this pin for stabilizing VOUT voltage.

VIN

6,7,8

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

the output pin. Minimum 10uF low ESR ceramic capacitor is recommended at this

pin.

REF

9

Reference Voltage Input. This pin is the non-inverting input of the error amplifier.

The FB voltage is regulated to track the 1/2 reference voltage input.

CNTL

10

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

GND

11

GND

Function Block Diagram

1

VOUT

E

REF

G D

Control

Logic

9

CT L

11

Current

Limit

3/4/5

6/7/8

VI

+

__

Thermal

SD

Power On

Reset

10

2

FB

200K

200K

30p