PAM2801SWAF095 datasheet(1/9 Pages) PAM

No. de pieza	PAM2801SWAF095

Descripción Electrónicos	1W High Power White LED Driver

PDF	9 Pages

Scroll/Zoom	100%

Fabricante Electrónico	PAM [Power Analog Micoelectronics]

Página de inicio	http://www.poweranalog.com

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Features

LED Power Efficiency: up to 90%

LED Current Accuracy: 3%(V =3.2V to

Internal 2A MOSFET Switch

1.0MHz Switching Frequency

Low R

: 100mΩ (TYP.)

Open LED Protection

Over Temperature Protection

±1.1

IN

DS(ON)

V

@V =3.4V)

Low Start-Up Voltage: 0.9V(I

=243mA)

Low Hold Voltage:0.65V(I

=95mA)

Uses Small,Low Profile External Components

Low Profile SOT-23 Package

White LED Torch (Flashlight)

White LED Camera Flash

DSC(Digital Still Camera)Flash

Cellular Camera Phone Flash

PDA Camera Flash

Camcorder Torch(Flashlight) Lamp

The PAM2801 is a step-up DC-DC converter that

delivers a regulated output current. The device

switches at a 1 .0MHz c onstant frequency,

allowing for the use of small value external

inductor and ceramic capacitors.

The PAM2801 is targeted to be used for driving

1W white LED from a 0.9V to 3.2V input. The LED

current can be programmed by the external

current sense resistor, Rs, connected between the

feedback pin (FB) and ground. A low 95mV

feedback voltage reduces the power loss in the Rs

for better efficiency. With its internal 2A, 100

device

even at heavy load.

LED dimming can be done by using a DC voltage

applied to the FB pin and a pulse width modulation

(PWM) signal applied to the FB pin or SHDN pin.

During the shutdown mode, the feedback resistor

Rs and the load are completely disconnected and

the current consumption is reduced to less than

1uA.

The PAM2801 is available in the 6-lead SOT-23-6

package.

F

LED

Applications

General Description

mΩ

NMOS switch, the

can provide high

efficiency

n

n Pb-Free Package

n

Typical Application

PAM2801

1W High Power White LED Driver

,

Power Analog Microelectronics Inc

95mV

Reference

+

A1

-

Rc

Cc

-

A2

+

Comparator

VOUT

VIN

SW

PWM Logic

And Driver

+

-

GND

1.0MHz

Oscillator

Shutdown

And

Soft-start

FB

Σ

Ramp

Generator

SHDN

Block Diagram

1

www.poweranalog.com

08/2007

10uF

2.2uH

10uF

OFF ON

R

S

3

2

1

6

5

4

SW

VIN

VOUT

FB

SHDN

GND

WLED

V

IN

C

O

C

IN

1W

PAM2801

I

=350mA,R =0.27

LED

S

Ω

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