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LTC3453

Description
Synchronous Buck-Boost High Power White LED Driver
File Size179KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC3453 Overview

Synchronous Buck-Boost High Power White LED Driver

LTC3453
Synchronous Buck-Boost
High Power White LED Driver
FEATURES
DESCRIPTIO
High Efficiency: 90% Typical Over Entire
Li-Ion Battery Range
Wide V
IN
Range: 2.7V to 5.5V
Up to 500mA Continuous Output Current
Internal Soft-Start
Open/Shorted LED Protection
LED Current Matching Typically <2%
Constant Frequency 1MHz Operation
Low Shutdown Current: 6µA
Overtemperature Protection
Small Thermally Enhanced 16-Lead (4mm x 4mm)
QFN Package
The LTC
®
3453 is a synchronous buck-boost DC/DC con-
verter optimized for driving up to 4 white LEDs at a
combined current of up to 500mA from a single Li-Ion
battery input. The regulator operates in either synchro-
nous buck, synchronous boost, or buck-boost mode,
depending on input voltage and LED maximum forward
voltage. Optimum efficiency is achieved using a propri-
etary architecture that determines which LED requires the
largest forward voltage drop at its programmed current,
and regulates the common output rail for lowest dropout.
Efficiency of 90% can be achieved over the entire usable
range of a Li-Ion battery (2.7V to 4.2V).
LED current is programmable to one of four levels (includ-
ing shutdown) with dual current setting resistors and dual
enable pins. In shutdown, the supply current is only 6µA.
A high constant operating frequency of 1MHz allows the
use of a small external inductor. The LTC3453 is offered
in a low profile (0.75mm) thermally enhanced 16-lead
(4mm x 4mm) QFN package.
APPLICATIO S
Cell Phones
Digital Cameras
PDAs
Portable Devices
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
High Efficiency Torch/Flash LED Driver
L1
4.7µH
V
IN
1-CELL
Li-Ion
2.7V to 4.2V
LED POWER EFFICIENCY P
LED
/P
IN
(%)
2.2µF
V
IN
PV
IN
SW1
SW2
V
OUT
150mA/500mA
4.7µF
D1
LED1
LED2
V
C
0.1µF
EN1 (TORCH)
EN2 (FLASH)
8.25k
1%
EN1
EN2
I
SET1
I
SET2
3.48k
1%
LTC3453
GND
GND
PGND
3453 TA01a
1MHz
BUCK-BOOST
LED3
LED4
D1: LUMILEDS LXCL-PWF1
L1: VISHAY DALE IDCS-2512
EN1
0
1
0
1
EN2
0
0
1
1
I
LED
0 (SHUTDOWN)
150mA
350mA
500mA
U
Torch Mode Efficiency vs V
IN
100
180
90
EFFICIENCY
80
140
160
INPUT CURRENT (mA)
U
U
70
I
IN
60
I
LED
= 150mA
T
A
= 25°C
3.1
3.5
3.9 4.3
V
IN
(V)
4.7
5.1
5.5
120
100
50
2.7
80
3453 TA01b
3453fa
1

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