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LM3556 Datenblatt(PDF) 1 Page - Texas Instruments

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Teilenummer LM3556
Bauteilbeschribung  1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3556 Datenblatt(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
2.5V to 5.5V
LM3556
www.ti.com
SNVS796C – AUGUST 2011 – REVISED APRIL 2013
1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source
Check for Samples: LM3556
1
FEATURES
DESCRIPTION
The LM3556 is a 4 MHz fixed-frequency synchronous
2
Grounded Cathode LED Operation for
boost converter plus 1.5A constant current driver for
Improved Thermal Management
a high-current white LED. The high-side current
1.5A 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 1.5A. An adaptive
regulation
method
ensures
the
current
source
46.9 mA to 1.5A
remains in regulation and maximizes efficiency.
> 85% Efficiency in Torch Mode (@ 100 mA)
and Flash Mode (@1A to 1.5A)
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
thermistor and provide an interrupt to the LED
Synchronization Input for RF Power Amplifier
current. With a fast 1
μs transition from 0 mA to 46.9
Pulse Events
mA, the Torch input pin can be used to develop
VIN Flash Monitor Optimization
custom LED current waveforms.
400 kHz I2C-Compatible Interface
The
4
MHz
switching
frequency,
over-voltage
I2C-Compatible Programmable NTC Trip Point
protection and adjustable current limit allow for the
0.4 mm Pitch, 16-Bump DSBGA Package
use of tiny, low-profile inductors and (10 µF) ceramic
capacitors. The device is available in a small 16-
bump (1.660 mm x 1.610 mm x 0.6 mm) DSBGA
APPLICATIONS
package and operates over the
−40°C to +85°C
Camera Phone LED Flash
temperature range.
TYPICAL APPLICATION CIRCUIT
1
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.
2
All trademarks are the property of their respective owners.
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.


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