Datasheet > AIC1648CGTR

AIC1648CGTR

更新时间： 2024-09-15 04:31:59

品牌	Logo	应用领域
沛亨 - AIC		转换器升压转换器
页数	文件大小	规格书
10页	376K
描述
Built-in OVP White LED Step-Up Converter

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AIC1648CGTR 数据手册

AIC1648

Built-in OVP White LED Step-Up Converter

ꢀFEATURES

ꢀDESCRIPTION

Built-In Open Circuit Protection

ꢁ

AIC1648 is a fixed frequency step-up DC/DC

Over Voltage Protection

ꢁ

converter designed to drive white LEDs with a

Efficiency Up to 84% at V_IN=4.2V, 3LEDs,

ꢁ

constant current to provide backlight in hand-

held devices. Series connection of LEDs

provides identical LED currents resulting in

uniform brightness. This configuration eliminates

the need of ballast resistors. The built-in open

load protection prevents the damage resulting

from an open circuit condition. Low 95mV

feedback voltage minimizes power loss in the

current setting resistor for better efficiency.

_LED=20mA

1.2MHz Fixed Switching Frequency

Drives Up to 5LEDs in series

Low Supply Current: 70µA

Matches LED Current

ꢁ

Requires Tiny Inductor and Capacitors

Tiny SOT-23-6 Package

ꢀAPPLICATIONS

AIC1648 is a step-up PWM converter, which

includes an internal N-channel MOSFET switch

for high efficiency. The high switching frequency,

1.2MHz, allows the use of tiny external

components.

Cellular Phones

ꢁ

PDAs

ꢁ

DSCs

ꢁ

Handheld Devices

ꢁ

White LED Display Backlighting

ꢁ

AIC1648 is available in a space-saving, 6-lead

SOT-23-6 package.

TYPICAL APPLICATION CIRCUIT

ꢀ

3.3~4.2V

=4.2V

6.8µH

1µF

VIN

=3.6V

SHDN

GND

OVP

=3.0V

20mA

AIC1648

3 LEDs, 6.8 H

L1: 976AS-6R8M, TOKO

D1: RB521S-30, ROHM

L1: 976AS-6R8M/D321F, TOKO

D1: RB521S-30, ROHM

C1: JMK107BJ105KA, TAIYO YUDEN

C2: EMK212BJ105KA, TAIYO YUDEN

4.7Ω

LED Current (mA)

Fig. 1 Li-Ion Powered Driver for Three White LEDs

Analog Integrations Corporation

Si-Soft Research Center

DS-1648P-03 010405

3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.

TEL: 886-3-5772500

FAX: 886-3-5772510

www.analog.com.tw

12 3 4 5 6 7...10

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