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LT3468ES5-2#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LT3468/LT3468-1/LT3468-2
10
346812fa
Board Layout
The high voltage operation of the LT3468/LT3468-1/
LT3468-2 demands careful attention to board layout. You
will not get advertised performance with careless layout.
Figure 5 shows the recommended component placement.
Keep the area for the high voltage end of the secondary as
small as possible. Also note the larger than minimum
spacing for all high voltage nodes in order to meet break-
down voltage requirements for the circuit board.
It is
imperative to keep the electrical path formed by C1, the
primary of T1, and the LT3468/LT3468-1/LT3468-2 as
short as possible.
If this path is haphazardly made long, it
will effectively increase the leakage inductance of T1,
which may result in an overvoltage condition on the SW
pin.
APPLICATIO S I FOR ATIO
WUU
U
Figure 5. Suggested Layout: Keep Electrical Path Formed by C1,
Transformer Primary and LT3468/LT3468-1/LT3468-2 Short
D2
R1
D1
(DUAL DIODE)
C1
SECONDARY
PRIMARY
C
OUT
PHOTOFLASH
CAPACITOR
T1
V
IN
CHARGE
DONE
+
•
•
4
5
3
2
1
3468 F05
Table 4. Recommended Clamp Diodes
MAX REVERSE VOLTAGE
PART (V) VENDOR
ZHCS400 40 Zetex
(631) 360-2222
www.zetex.com
B0540W 40 Diodes Inc.
(805) 446-4800
www.diodes.com
MA2Z720 40 Panasonic
(408) 487-9510
www.panasonic.co.jp
TYPICAL APPLICATIO S
U
should be a Schottky diode with at least a 500mA peak
forward current capability. The diode forward voltage drop
should be 600mV or less at 500mA of forward current.
Reverse voltage rating should be 40V or higher. Table 4
shows various recommended clamping diodes.
LT3468
CHARGE
GND
V
IN
SW
+
DONE DONE
CHARGE
C1
4.7µF
R1
100k
T1
1:10.2
V
IN
2.5V TO 8V
320V
1
2
4
5
3468 F06
D2
C
OUT
PHOTOFLASH
CAPACITOR
C1: 4.7µF, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6-1, L
PRI
= 10µH, 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
D1
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
5
6
C1: 4.7µF, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6S-1, L
PRI
= 24µH, 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 F07
Figure 6. LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
Figure 7. LT3468-1 Photoflash Charger Uses
High Efficiency 3mm Tall Transformer
LT3468/LT3468-1/LT3468-2
11
346812fa
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
U
PACKAGE DESCRIPTIO
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIO S
U
LT3468-2
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
5
8
4
1
C1: 4.7µF, X5R OR X7R, 10V
T1: TDK LDT565630T-003 L
PRI
= 10.5µH, 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 F08
Figure 8. LT3468-2 Photoflash Charger Uses High Efficiency 3mm Tall Transformer
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3)
S5 TSOT-23 0302
PIN ONE
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX
0.01 – 0.10
0.20 BSC
0.30 – 0.50 REF
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.62
MAX
0.95
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
LT3468/LT3468-1/LT3468-2
12
346812fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2003
LT/TP 0105 1K REV A • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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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
P1-P3P4-P6P7-P9P10-P12

LT3468ES5-2#TRMPBF

Mfr. #:
Buy LT3468ES5-2#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 375mA Photoflash Capacitor Charger
Lifecycle:
New from this manufacturer.
Delivery:
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