LT3468ES5 Linear Technology Corporation, LT3468ES5 Datasheet
LT3468ES5
Manufacturer Part Number
LT3468ES5
Description
Manufacturer
Linear Technology Corporation
Specifications of LT3468ES5
Case
SOT-153
Date_code
2008+
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FEATURES
APPLICATIO S
TYPICAL APPLICATIO S
2.5V TO 8V
C1: 4.7 F, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6-1, L
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
Highly Integrated IC Reduces Solution Size
Uses Small Transformers:
Fast Photoflash Charge Times:
Controlled Input Current:
Supports Operation from Single Li-Ion Cell, or Any
Supply from 2.5V up to 16V
Adjustable Output Voltage
No Output Voltage Divider Needed
Charges Any Size Photoflash Capacitor
Low Profile (1mm) SOT-23 Package
Digital / Film Camera Flash
PDA / Cell Phone Flash
Emergency Strobe
CHARGE
5.8mm 5.8mm 3mm
4.6s for LT3468 (0V to 320V, 100 F, V
5.5s for LT3468-1 (0V to 320V, 50 F, V
500mA (LT3468)
225mA (LT3468-1)
DONE
V IN
100k
Figure 1. LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
R1
C1
4.7 F
DONE
CHARGE
U
V
IN
LT3468
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
PRI
SW
GND
= 10 H, N = 10.2
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.
1
2
1:10.2
T1
U
D2
4
5
D1
+
IN
IN
C OUT
PHOTOFLASH
CAPACITOR
= 3.6V)
320V
= 3.6V)
3468 TA01
DESCRIPTIO
The LT
to charge photoflash capacitors in digital and film cam-
eras. A new control technique* allows for the use of
extremely small transformers. Each device contains an
on-chip high voltage NPN power switch. Output voltage
detection* is completely contained within the device,
eliminating the need for any discrete zener diodes or
resistors. The output voltage can be adjusted by simply
changing the turns ratio of the transformer. The LT3468
has a primary current limit of 1.4A while the LT3468-1 has
a 0.7A limit. These different current limit levels result in
well controlled input currents of 500mA for the LT3468
and 225mA for the LT3468-1. Aside from the differing
current limit, the two devices are otherwise equivalent.
The CHARGE pin gives full control of the part to the user.
Driving CHARGE low puts the part in shutdown. The DONE
pin indicates when the part has completed charging. The
LT3468 series of parts are housed in tiny low profile
(1mm) SOT-23 packages.
ThinSOT is a trademark of Linear Technology Corporation. *U.S. Patent # 6, 518, 733
2.5V TO 8V
C1: 4.7 F, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6S-1, L
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
, LTC and LT are registered trademarks of Linear Technology Corporation.
CHARGE
DONE
V IN
®
3468/LT3468-1 are highly integrated ICs designed
100k
Figure 2. LT3468-1 Photoflash Charger Uses
High Efficiency 3mm Tall Transformer
R1
Photoflash Capacitor
Charger in ThinSOT
C1
4.7 F
DONE
CHARGE
V
U
IN
LT3468-1
Final Electrical Specifications
LT3468/LT3468-1
SW
GND
PRI
4
3
= 24 H, N = 10.2
1:10.2
T1
D2
5
6
October 2003
D1
+
C OUT
PHOTOFLASH
CAPACITOR
320V
3468 TA02
34681i
1
TM
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