Datasheet > LM3500

LM3500

更新时间： 2022-10-12 16:22:04

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描述
LM3500 Synchronous Step-up DC/DC Converter for White LED Applications

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LM3500 数据手册

LM3500

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SNVS231G –AUGUST 2003–REVISED MAY 2013

LM3500 Synchronous Step-up DC/DC Converter for White LED Applications

Check for Samples: LM3500

FEATURES

APPLICATIONS

•

Synchronous Rectification, High Efficiency

and no External Schottky Diode Required

•

LCD Bias Supplies

White LED Backlighting

Handheld Devices

Digital Cameras

•

Uses Small Surface Mount Components

Can Drive 2-5 White LEDs in Series

–

(May Function With More Low-V_FLEDs)

Portable Applications

•

2.7V to 7V Input Range

DESCRIPTION

Internal Output Over-Voltage Protection (OVP)

Circuitry, with no External Zener Diode

Required

The LM3500 is a fixed-frequency step-up DC/DC

converter that is ideal for driving white LEDs for

display backlighting and other lighting functions. With

fully intergrated synchronous switching (no external

schottky diode required) and a low feedback voltage

(500mV), power efficiency of the LM3500 circuit has

been optimized for lighting applications in wireless

phones and other portable products (single cell Li-Ion

or 3-cell NiMH battery supplies). The LM3500

operates with a fixed 1MHz switching frequency.

When used with ceramic input and output capacitors,

the LM3500 provides a small, low-noise, low-cost

solution.

–

LM3500-16: 15.5V OVP; LM3500-21: 20.5V

OVP.

•

True Shutdown Isolation

Input Undervoltage Lockout

Requires Only Small Ceramic Capacitors at the

Input and Output

•

Thermal Shutdown

0.1µA Shutdown Current

Small 8-Bump Thin DSBGA Package

Typical Application Circuit

V_IN

2.7V - 5.5V

22 mH

V_IN

V_SW

C_OUT

C_IN

LM3500-16

1mF

Ceramic

V_OUT

1mF

Ceramic

>1.1V

<0.3V

SHDN

AGND GND

24W

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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