2.9 mm

5.3 mm

HWEN

SCL

SDA

STROBE

TX1

TX2

LEDI/

NTC

LED

OUT

IN

CIN

COUT

L

LM3561

10 PF

IN

OUT

LED

LEDI/NTC

SW

HWEN

TX1/TORCH

TX2

SDA

SCL

LM3561

GND

1 PH/2.2 PH

10 PF

Flash

LED

STROBE

Optional Indicator LED or

Thermistor input for LED

temperature measurement

2.5V to 5.5V

LM3561

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SNOSB44C – MARCH 2011 – REVISED MAY 2013

Synchronous Boost Converter

Check for Samples: LM3561

1

FEATURES

2

•

High-Side Current Source Allows Grounded

•

12-Bump (1.215mm × 1.615mm × 0.6mm)

LED Cathode

DSBGA Package

•

Up to 90% Efficient

APPLICATIONS

•

•

Camera Phone LED Flash Controller

•

Three Operating Modes: Torch, Flash, and LED

•

LED Current Source Biasing

Indicator

•

Accurate and Programmable LED Current from

DESCRIPTION

18mA to 600mA

The LM3561 is a 2-MHz fixed-frequency current-

•

Hardware Flash and Torch Enable

mode synchronous boost converter. The device is

•

LED Thermal Sensing and Current Scaleback

designed to operate as a single 600-mA constant

•

Software Selectable Input Voltage Monitor

current driver for high-current white LEDs. The high-

side current source allows for grounded cathode LED

•

Programmable Flash Timeout

operation while the 250-mV regulated headroom

•

Dual Synchronization Inputs for RF Power

voltage ensures that the LED current is well regulated

Amplifier Pulse Events

and efficiency remains high.

•

Open and Short LED Detection

•

Active High Hardware Enable for Protection

Against System Faults

•

Typical Application Circuits

Figure 1.

Figure 2. Example Layout

1

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

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.