LT3484-2 Photoflash Capacitor Charger

The LT®3484 family of photoflash capacitor charger ICs is designed for use in digital camera and mobile phone applications where space is at a premium. The LT3484's patented control technique allows it to use extremely small transformers, and the improved NPN power switch requires no external Schottky diode clamp, reducing solution size. Output voltage detection requires no external circuitry as the transformer turns ratio determines final charge voltage.

The devices feature a VBAT pin, which allows the use of 2 alkaline cells to charge the capacitor. The LT3484-2, -2 and -1 have primary current limits of 1.4A, 1A and 0.7A respectively, resulting in tightly controlled average input current of 500mA, 350mA and 225mA respectively. The three versions are otherwise identical.

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 LT3484 series of parts are housed in a tiny low profile 2mm × 3mm DFN package

产品特点 Features

Highly Integrated IC in 2mm × 3mm DFN Package Reduces Solution Size
Uses Small Transformers:
5.8mm × 5.8mm × 3mm
Fast Photoflash Charge Times:
    4.6s for LT3484-0 (0V to 320V, 100µF, VIN = 3.6V)
    5.7s for LT3484-2 (0V to 320V, 100µF, VIN = 3.6V)
    5.5s for LT3484-1 (0V to 320V, 50µF, VIN = 3.6V)
Operates from Two AA Batteries, or Any Supply from 1.8V up to 16V
Controlled Average Input Current
    500mA (LT3484-0)
    350mA (LT3484-2)
    225mA (LT3484-1)
No Output Voltage Divider Needed
No External Schottky Diode Required
Charges Any Size Photoflash Capacitor
Available in 6-Lead 2mm × 3mm DFN Package

应用

Digital Camera and Cell Phone Flash Charger

典型应用图

参数

LT3484-2 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT3484EDCB-0	DFN	6	E	$3.14
LT3484EDCB-0#PBF	DFN	6	E	$3.14
LT3484EDCB-0#TR	DFN	6	E	$3.14	$2.20
LT3484EDCB-0#TRM	DFN	6	E	$3.14	$2.22
LT3484EDCB-0#TRMPBF	DFN	6	E	$3.14	$2.22
LT3484EDCB-0#TRPBF	DFN	6	E	$3.14	$2.20
LT3484EDCB-1	DFN	6	E	$3.14
LT3484EDCB-1#PBF	DFN	6	E	$3.14
LT3484EDCB-1#TR	DFN	6	E	$3.14	$2.20
LT3484EDCB-1#TRM	DFN	6	E	$3.14	$2.22
LT3484EDCB-1#TRMPBF	DFN	6	E	$3.14	$2.22
LT3484EDCB-1#TRPBF	DFN	6	E	$3.14	$2.20
LT3484EDCB-2	DFN	6	E	$3.14
LT3484EDCB-2#PBF	DFN	6	E	$3.14
LT3484EDCB-2#TR	DFN	6	E	$3.14	$2.20
LT3484EDCB-2#TRM	DFN	6	E	$3.14	$2.22
LT3484EDCB-2#TRMPBF	DFN	6	E	$3.14	$2.22
LT3484EDCB-2#TRPBF	DFN	6	E	$3.14	$2.20

LT3484-2 数据手册及相关资料下载

数据手册(英文) : LT3484-0/LT3484-1/LT3484-2 - Photoflash Capacitor Chargers.PDF
可靠性数据 : R324 Reliability Data .PDF