IN

HWEN

LM3648

SDA

SCL

SW

OUT

LED

STROBE

TORCH/

TEMP

GND

TX

10 2F

10 2F

C2

L1

C1

D1

2P/2C

2.5V J 5.5V

1 2H

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LM3648, LM3648TT

SNVSA68B – OCTOBER 2014 – REVISED SEPTEMBER 2015

LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source

1 Features

3 Description

The LM3648 is an LED flash driver that provides a

1

•

1.5-A LED Current Source Programmability

high level of adjustability within a small solution size.

•

Accurate and Programmable LED Current Range

The LM3648 utilizes a 2-MHz or 4-MHz fixed-

from 1.954 mA to 1.5 A

frequency synchronous boost converter to provide

•

Torch Currents up to 500 mA (LM3648TT)

power to the 1.5-A constant current LED source. An

adaptive regulation method ensures the current

•

Flash Timeout Values up to 1.6 Seconds

source

remains

in

regulation

and

maximizes

(LM3648TT)

efficiency.

•

Optimized Flash LED Current During Low Battery

Conditions (IVFM)

compatible

interface.

These

features

include:

•

> 85% Efficiency in Torch Mode (at 100 mA) and

hardware flash and hardware torch pins (STROBE

Flash Mode (at 1 A to 1.5 A)

and TORCH/TEMP), a TX interrupt, and an NTC

•

Grounded Cathode LED Operation for Improved

thermistor

monitor.

The

device

offers

64

Thermal Management

programmable currents in Flash and 128 levels in

Movie Mode (Torch) condition.

•

•

Hardware Strobe Enable (STROBE)

The 2-MHz or 4-MHz switching frequency options,

overvoltage protection (OVP), and adjustable current

•

Synchronization Input for RF Power Amplifier

limit allow for the use of tiny, low-profile inductors and

Pulse Events (TX)

(10-µF) ceramic capacitors. The device operates over

•

Hardware Torch Enable (TORCH/TEMP)

a –40°C to +85°C ambient temperature range.

•

Remote NTC Monitoring (TORCH/TEMP)

Device Information(1)

•

PART NUMBER

PACKAGE

BODY SIZE (MAX)

–

LM3648

DSBGA (12)

1.69 mm x 1.31 mm

2 Applications

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Camera Phone White LED Flash

Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.