Datasheet

LTC3454
12
3454fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0309 REV A • PRINTED IN USA
TYPICAL APPLICATION
LED
I
LED
= 500mA
EN2
EN1
0.1μF
V
C
GND (EXPOSED PAD)
LTC3454
I
SET1
I
SET2
3453 TA02
R
ISET1
6.19k
1%
SW1V
IN
SWB
SWA
SWD
SWC
LED: LUMILEDS, LXCL LW3C
L1: TOKO A997AS-4R7M
SW2 V
OUT
2.2μF
3-CELL
ALKALINE
4.5V
4.7μF
L1
4.7μH
LED
1MHz
BUCK-BOOST
500mA LED Flashlight Driver
V
IN
(V)
2.7
EFFICIENCY (%)
80
85
90
5.1
3454 TA02b
75
70
60
3.5
4.3
3.1 5.5
3.9
4.7
65
100
95
I
LED
= 500mA
T
A
= 25°C
EFFICIENCY = (V
OUT
– V
LED
)I
LED
/V
IN
I
IN
LED Power Effi ciency vs V
IN
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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IN
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OUT(MAX)
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Q
= 1.8mA, I
SD
< 1μA,
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SW
), 1.2MHz/2.2MHz, High Effi ciency Step-Up V
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Q
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SD
< 1μA,
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IN
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OUT(MAX)
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Q
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SD
< 1μA,
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IN
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OUT(MAX)
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Q
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SD
< 1μA,
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IN
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OUT(MAX)
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Q
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SD
< 1μA,
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IN
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OUT(MAX)
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Q
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SD
< 2.5μA,
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IN
: 2.9V to 4.4V, V
OUT(MAX)
= 5.5V, I
Q
= 300μA, I
SD
< 2.5μA,
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OUT
, 2MHz/1MHz, Synchronous Buck-Boost V
IN
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OUT(MAX)
= 5.25V, I
Q
= 25μA/50μA, I
SD
<1 μA,
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OUT
, 600kHz, Synchronous Buck-Boost V
IN
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OUT(MAX)
= 5.25V, I
Q
= 28μA, I
SD
< 1μA,
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IN
: 1V to 3.2V, V
OUT(MAX)
= 4V, I
Q
= 20μA, I
SD
= 20μA,
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IN
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QFN-16 Package
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IN
: 2.7V to 16V, V
OUT(MAX)
= 34V, I
Q
= 1.9mA, I
SD
< 1μA,
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IN
: 2.7V to 24V, V
OUT(MAX)
= 40V, I
Q
= 5mA, I
SD
< 16μA,
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IN
: 2.5V to 24V, V
OUT(MAX)
= 40V, I
Q
= 6.5mA, I
SD
< 1μA,
Inrush Current Protection DFN Package/TSOPP Package