LT3468 데이터 시트보기 (PDF) - Linear Technology
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LT3468 Datasheet PDF : 12 Pages
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LT3468/LT3468-1/LT3468-2
TYPICAL APPLICATIO S
LT3468 Photoflash Circuit uses Tiny 3mm Tall Transformer
VIN
2.5V TO 8V
R1
100k
DONE
CHARGE
C1
4.7µF
T1
1:10.4
5, 6
4
7, 8
1
5
1
VIN
SW
D2
3
LT3468
2
DONE
GND
4
CHARGE
D1
+
320V
COUT
PHOTOFLASH
CAPACITOR
C1: 4.7µF, X5R OR X7R, 10V
T1: TDK PART# LDT565630T-001, LPRI = 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
Charge Time
10
9
8
7
6
5
4
3
COUT = 100µF
2
1 COUT = 50µF
0
234567
VIN (V)
89
3468 TA05
LT3468-1 Photoflash Circuit uses Tiny 3mm Tall Transformer
VIN
2.5V TO 8V
C1
4.7µF
T1
1:10.2
D1
5
4
8
1
+
5
1
R1
VIN
SW
D2
100k
3
LT3468-1
2
DONE
DONE
GND
CHARGE
4
CHARGE
320V
COUT
PHOTOFLASH
CAPACITOR
C1: 4.7µF, X5R OR X7R, 10V
T1: TDK PART# LDT565630T-002, LPRI = 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
10
9
8
7
6
5
4
3
COUT = 50µF
2
1
COUT = 20µF
0
234567
VIN (V)
89
3468 TA06
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3407
LT3420/LT3420-1
LTC3425
LTC3440/LTC3441
Dual 600mA (IOUT), 1.5MHz, Synchronous Step-Down DC/DC
Converter
1.4A/1A, Photoflash Capacitor Chargers with
Automatic Top-Off
5A ISW, 8MHz, Multi-Phase Synchronous Step-Up DC/DC
Converter
600mA/1A (IOUT), Synchronous Buck-Boost DC/DC Converter
96% Efficiency, VIN: 2.5V to 5.5V, VOUT(MIN): 0.6V, IQ: 40µA,
ISD: <1µA, MS10E
Charges 220µF to 320V in 3.7 seconds from 5V,
VIN: 2.2V to 16V, IQ: 90µA, ISD: <1µA, MS10
95% Efficiency, VIN: 0.5V to 4.5V, VOUT(MIN): 5.25V, IQ: 12µA,
ISD: <1µA, QFN-32
95% Efficiency, VIN: 2.5V to 5.5V, VOUT(MIN): 2.5V to 5.5V,
IQ: 25µA, ISD: <1µA, MS-10, DFN-12
346812f
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com
LT/TP 0304 1K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2004
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