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LM3556 Datasheet(PDF) 1 Page - Texas Instruments

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Part # LM3556
Description  Synchronous Boost LED Flash Driver With High-Side Current Source
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3556 Datasheet(HTML) 1 Page - Texas Instruments

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IN
OUT
TEMP
SW
ENABLE
TORCH
TX
SDA
SCL
GND
1 PH
10 PF
10 PF
STROBE
LED
Flash
LED
2.5 V to 5.5 V
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LM3556
SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015
LM3556 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source
1 Features
3 Description
The LM3556 is a 4-MHz fixed-frequency synchronous
1
Grounded Cathode LED Operation for Improved
boost converter plus 1.5-A constant current driver for
Thermal Management
a high-current white LED. The high-side current
1.5-A High-Side Current Source for Single LED
source allows for grounded cathode LED operation
Accurate and Programmable LED Current from
providing flash current up to 1.5 A. An adaptive
regulation
method
ensures
the
current
source
46.9 mA to 1.5 A
remains in regulation and maximizes efficiency.
> 85% Efficiency in Torch Mode (at 100 mA) and
Flash Mode (at 1 A to 1.5 A)
The LM3556 is controlled via an I2C-compatible
interface. Features include: a hardware flash enable
Small Solution Size: < 20 mm2
(STROBE) allowing a logic input to trigger the flash
LED Thermal Sensing and Current Scale-Back
pulse, a hardware torch enable (TORCH) for Movie
Soft-Start Operation for Battery Protection
Mode or flashlight functions, a TX input which forces
the flash pulse into a low-current Torch Mode
Hardware Enable Pin
allowing for synchronization to RF power amplifier
Hardware Torch Enable
events or other high-current conditions, and an
Hardware Strobe Enable
integrated comparator designed to monitor an NTC
Synchronization Input for RF Power Amplifier
thermistor and provide an interrupt to the LED
current. With a fast 1-
μs transition from 0 mA to
Pulse Events
46.9 mA, the TORCH input pin can be used to
VIN Flash Monitor Optimization
develop custom LED current waveforms.
400-kHz I2C-Compatible Interface
The
4-MHz
switching
frequency,
overvoltage
I2C-Compatible Programmable NTC Trip Point
protection and adjustable current limit allow for the
0.4-mm Pitch, 16-Pin DSBGA Package
use of tiny, low-profile inductors and 10-µF ceramic
capacitors. The device is operates over a
−40°C to
2 Applications
+85°C temperature range.
Camera Phone LED Flash
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3556
DSBGA (16)
1.69 mm × 1.64 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
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.


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