Block Diagram

2

Pin Configuration& Marking Information

Top View

SOT23 5

-

BA VYW

123

54

BA: Product Code of PAM2301

V:

Output Voltage

Y:

Year

W: Week

,

Power Analog Microelectronics Inc

www.poweranalog.com

PAM2301

800mA Step-Down DC-DC Converters

Pin Number

Name

Function

1EN

Enable control input. Force this pin voltage above 1.5V, enables the chip, and

below 0.3V shuts down the device.

2

GND

Ground

3

SW

The drains of the internal main and synchronous pow er MOSFET.

4

VIN

Chip main power supply pin

5VOUT/FB

VOUT: Output voltage feedback pin, an internal resistive divider divides the

output voltage down for comparison to the internal reference voltage.

FB: Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.

09/2008 Rev 1.3

VOUT/FB

GND

SW

EN

VIN

EN

R1

R2

FB

PWM

COMP

+

-

IAMP

+

-

IRCMP

SW

GND

SYNCHRONOUS

RECTIFIER NCH

()

MAIN

SWITCH PCH

()

VIN

COMP

VIN

SHUTDOWN

OSC

RS LATCH

0.6VREF

FREQ

SHIFT

-

+

EA

SQ

RQ

SWITCHING

LOGIC

AND

BLANKING

CIRCUIT

SLOPE

COMP

1.5M

OSC

ANTI

SHOOT

THRU

-

-