Datasheet

LT3468/LT3468-1/LT3468-2
12
346812fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
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FAX: [phone]
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www.linear.com © LINEAR TECHNOLOGY CORPORATION 2003
LT/TP 0105 1K REV A • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC3407 Dual 600mA (I
OUT
), 1.5MHz, Synchronous Step-Down DC/DC 96% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
: 0.6V, I
Q
: 40µA,
Converter I
SD
: <1µA, MS10E
LT3420/LT3420-1 1.4A/1A, Photoflash Capacitor Chargers with Charges 220µF to 320V in 3.7 seconds from 5V,
Automatic Top-Off V
IN
: 2.2V to 16V, I
Q
: 90µA, I
SD
: <1µA, MS10
LTC3425 5A I
SW
, 8MHz, Multi-Phase Synchronous Step-Up DC/DC 95% Efficiency, V
IN
: 0.5V to 4.5V, V
OUT(MIN)
: 5.25V, I
Q
: 12µA,
Converter I
SD
: <1µA, QFN-32
LTC3440/LTC3441 600mA/1A (I
OUT
), Synchronous Buck-Boost DC/DC Converter 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
: 2.5V to 5.5V,
I
Q
: 25µA, I
SD
: <1µA, MS-10, DFN-12
TYPICAL APPLICATIO S
U
LT3468 Photoflash Circuit uses Tiny 3mm Tall Transformer
LT3468-1 Photoflash Circuit uses Tiny 3mm Tall Transformer
LT3468
CHARGE
GND
V
IN
SW
+
DONE DONE
CHARGE
C1
4.7µF
R1
100k
T1
1:10.4
C
OUT
PHOTOFLASH
CAPACITOR
V
IN
2.5V TO 8V
D2
320V
D1
4
3
1
5, 6
7, 8
4
1
5
2
C1: 4.7µF, X5R OR X7R, 10V
T1: TDK PART# LDT565630T-001, L
PRI
= 6µH, N = 10.4
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
3468 TA03
LT3468-1
CHARGE
GND
V
IN
SW
+
DONE DONE
CHARGE
C1
4.7µF
R1
100k
T1
1:10.2
C
OUT
PHOTOFLASH
CAPACITOR
V
IN
2.5V TO 8V
D2
320V
D1
4
3
1
5
8
4
1
5
2
C1: 4.7µF, X5R OR X7R, 10V
T1: TDK PART# LDT565630T-002, L
PRI
= 14.5µH, N = 10.2
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
3468 TA04
Charge Time
Charge Time
V
IN
(V)
23456789
CHARGE TIME (s)
3468 TA05
10
9
8
7
6
5
4
3
2
1
0
C
OUT
= 50µF
C
OUT
= 100µF
V
IN
(V)
23456789
CHARGE TIME (s)
3468 TA06
10
9
8
7
6
5
4
3
2
1
0
C
OUT
= 20µF
C
OUT
= 50µF