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參數(shù)資料
| 型號(hào)： | LT3468ES5-2#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封裝： | PLASTIC, SOT-23, MO-193, 5 PIN |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 591K |
| 代理商： | LT3468ES5-2#PBF |
LT3468/LT3468-1/LT3468-2
1
346812f
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
s
Digital / Film Camera Flash
s
PDA / Cell Phone Flash
s
Emergency Strobe
s
Highly Integrated IC Reduces Solution Size
s
Uses Small Transformers:
5.8mm
× 5.8mm × 3mm
s
Fast Photoflash Charge Times:
4.6s for LT3468 (0V to 320V, 100
F, VIN = 3.6V)
5.7s for LT3468-2 (0V to 320V, 100
F, VIN = 3.6V)
5.5s for LT3468-1 (0V to 320V, 50
F, VIN = 3.6V)
s
Controlled Input Current:
500mA (LT3468)
375mA (LT3468-2)
225mA (LT3468-1)
s
Supports Operation from Single Li-Ion Cell, or Any
Supply from 2.5V up to 16V
s
Adjustable Output Voltage
s
No Output Voltage Divider Needed
s
Charges Any Size Photoflash Capacitor
s
Low Profile (<1mm) SOT-23 Package
Photoflash Capacitor
Chargers in ThinSOT
TM
The LT
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
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE
TRAINED PERSONNEL ONLY
LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
LT3468
CHARGE
GND
VIN
SW
+
DONE
CHARGE
4.7
F
100k
1:10.2
VIN
2.5V TO 8V
320V
1
2
4
5
346812 TA01
100
F
LT3468 Charging Waveform
3468 G01
1s/DIV
VIN = 3.6V
COUT = 100F
VOUT
50V/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
TYPICAL APPLICATIO
U
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