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LT3468-2 Datasheet

  • LT3468-2

  • Photoflash Capacitor Chargers in ThinSOT

  • 12頁

  • LINER

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LT3468/LT3468-1/LT3468-2
Photoflash Capacitor
Chargers in ThinSOT
TM
FEATURES
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DESCRIPTIO
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Highly Integrated IC Reduces Solution Size
Uses Small Transformers:
5.8mm
脳
5.8mm
脳
3mm
Fast Photoflash Charge Times:
4.6s for LT3468 (0V to 320V, 100碌F, V
IN
= 3.6V)
5.7s for LT3468-2 (0V to 320V, 100碌F, V
IN
= 3.6V)
5.5s for LT3468-1 (0V to 320V, 50碌F, V
IN
= 3.6V)
Controlled Input Current:
500mA (LT3468)
375mA (LT3468-2)
225mA (LT3468-1)
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
The LT
廬
3468/LT3468-1/LT3468-2 are highly integrated
ICs designed to charge photoflash capacitors in digital and
film cameras. A patented 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, the LT3468-2 has a 1A
limit, and the LT3468-1 has a 0.7A limit. These different
current limit levels result in well controlled input currents
of 500mA for the LT3468, 375mA for the LT3468-2 and
225mA for the LT3468-1. Aside from the differing current
limit, the three 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 available in tiny low profile
(1mm) SOT-23 packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation. *U.S. Patent # 6, 518, 733
APPLICATIO S
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Digital / Film Camera Flash
PDA / Cell Phone Flash
Emergency Strobe
TYPICAL APPLICATIO
LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
DANGER HIGH VOLTAGE 鈥?OPERATION BY HIGH VOLTAGE
TRAINED PERSONNEL ONLY
VIN
2.5V TO 8V
4.7碌F
2
5
1:10.2
1
4
320V
V
IN
= 3.6V
C
OUT
= 100碌F
+
100碌F
100k
DONE
CHARGE
V
IN
LT3468
DONE
CHARGE
346812 TA01
V
OUT
50V/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
SW
GND
U
LT3468 Charging Waveform
1s/DIV
3468 G01
U
U
sn346812 346812fs
1

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