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LTC3452EUF#PBF

Description
IC LED DRIVER RGLTR 25MA 20QFN
Categorysemiconductor    Power management   
File Size251KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC3452EUF#PBF Overview

IC LED DRIVER RGLTR 25MA 20QFN

LTC3452EUF#PBF Parametric

Parameter NameAttribute value
typeDC DC voltage regulator
Topologystep down, step up
internal switchyes
Number of outputs7
Voltage - Power supply (minimum)2.7V
Voltage - Power Supply (Highest)5.5V
Voltage - Output4.5V
Current - Output/Channel25mA,150mA
frequency1MHz
Dimming-
applicationbacklight, camera flash
Operating temperature-40°C ~ 85°C(TA)
Installation typesurface mount
Package/casing20-WFQFN Exposed Pad
Supplier device packaging20-QFN(4x4)
LTC3452
Synchronous Buck-Boost
MAIN/CAMERA White LED Driver
FEATURES
DESCRIPTIO
High Efficiency:
85% Over Entire Li-Ion Battery
Range
Wide V
IN
Range: 2.7V to 5.5V
Independent MAIN/CAMERA Current Control
Up to 425mA Continuous Output Current
Internal Soft-Start
Open/Shorted LED Protection
PWM Brightness Control
LED Current Matching Typically <2.5%
Constant Frequency 1MHz Operation
Low Shutdown Current: 6.5µA
Overtemperature Protection
Small Thermally Enhanced 20-Lead
(4mm
×
4mm) QFN Package
The LTC
®
3452 is a synchronous buck-boost DC/DC con-
verter optimized for driving two banks of white LEDs from
a single Li-Ion battery input. Five parallel LEDs can be
driven at up to 25mA each in the low power LED bank,
while two LEDs can be driven at up to 150mA each (or a
single LED at 300mA) in the high power LED bank. The
regulator operates in either synchronous buck, synchro-
nous boost or buck-boost mode, depending on input
voltage and LED maximum forward voltage. Optimum
efficiency is achieved by sensing which LED requires the
largest forward voltage drop at its programmed current,
and regulating the common output rail for lowest dropout.
Efficiency of 85% can be achieved over the entire usable
range of a Li-Ion battery (2.7V to 4.2V).
Maximum LED current for each LED display is program-
mable with a single external resistor. Dual enable pins
allow for PWM brightness control in the low power bank
and independent on/off control for the high current bank
(optimal for LED camera flash). In shutdown, the supply
current is only 6.5µA.
A high constant operating frequency of 1MHz allows the
use of a small external inductor. The LTC3452 is offered
in a low profile (0.75mm) thermally enhanced 20-lead
(4mm
×
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
L
4.7µH
V
IN
SINGLE
Li-Ion CELL
2.7V TO 4.2V
5
×
20mA White LED Display + 200mA Camera Light Driver
+
EN
H
I
SETH
6.19k
LED
L1
V
C
0.1µF
EN
L
I
SETL
10.2k
GND
GND
PGND
EXPOSED PAD
MAIN DISPLAY LED BACKLIGHT
D1: AOT 2015
D2 TO D6: NICHIA NSCW100
L: COILCRAFT DO3314-472
LTC3452
1MHz
BUCK/BOOST
LED
L2
LED
L3
LED
L4
LED
L5
2.2µF
V
IN
PV
IN
SW1
SW2
V
OUT
D1
CAM
LED
H1
LED
H2
D2
0mA TO
20mA
D3
0mA TO
20mA
D4
0mA TO
20mA
D5
0mA TO
20mA
D6
0mA TO
20mA
200mA
4.7µF
EFFICIENCY (%)
3452 TA01a
U
Torch and Flash Mode Efficiency
95
93
91
89
87
85
83
81
79
77
75
2.7
3.1
3.5
3.9 4.3
V
IN
(V)
4.7
5.1
5.5
FLASH MODE AT 200mA
T
A
= 25°C
(V
– V
LEDx
) • I
LEDx
EFFICIENCY =
Σ
OUT
V
IN
• I
IN
TORCH MODE AT 100mA
3452 TA01b
U
U
3452f
1

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LTC3452EUF#PBF LTC3452EUF#TRPBF LTC3452EUF#TR
Description IC LED DRIVER RGLTR 25MA 20QFN IC LED DRIVER RGLTR 25MA 20QFN LTC3452 - Synchronous Buck-Boost MAIN/CAMERA White LED Driver; Package: QFN; Pins: 20; Temperature Range: -40°C to 85°C
type DC DC voltage regulator DC DC voltage regulator -
Topology step down, step up step down, step up -
internal switch yes yes -
Number of outputs 7 7 -
Voltage - Power supply (minimum) 2.7V 2.7V -
Voltage - Power Supply (Highest) 5.5V 5.5V -
Voltage - Output 4.5V 4.5V -
Current - Output/Channel 25mA,150mA 25mA,150mA -
frequency 1MHz 1MHz -
application backlight, camera flash backlight, camera flash -
Operating temperature -40°C ~ 85°C(TA) -40°C ~ 85°C(TA) -
Installation type surface mount surface mount -
Package/casing 20-WFQFN Exposed Pad 20-WFQFN Exposed Pad -
Supplier device packaging 20-QFN(4x4) 20-QFN(4x4) -
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