LT3485-3

LT3485-0/LT3485-1/ www.DataSheet4U.com LT3485-2/LT3485-3 Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive FEATURES ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Integrated IGBT Driver Voltage Output Monitor Uses Small Transformers: 5.8mm × 5.8mm × 3mm Operates from Two AA Batteries, Single Cell Li-Ion or Any Supply from 1.8V up to 10V No Output Voltage Divider Needed No External Schottky Diode Required Charges Any Size Photoflash Capacitor Available in 10-Lead (3mm × 3mm) DFN VERSION LT3485-3 LT3485-0 LT3485-2 LT3485-1 INPUT CURRENT (mA) 750 500 350 225 CHARGE TIME (sec) 2.5 3.7 5.5 4.0* Fast Charge Time VIN = VBAT = 3.6V 100µF capacitor, 320V. *50µF capacitor The LT®3485 family of photoflash chargers are highly integrated ICs containing complete charger and IGBT drive functions. The patented control technique of the LT3485-x allows it to use extremely small transformers. Output voltage detection requires no external circuitry. The turns ratio of the transformer controls the final charge voltage. While charging, the output voltage on the capacitor may be monitored by a microcontroller from the monitor pin. Each device contains an on-chip high voltage NPN power switch, which can withstand negative voltages on the switch pin without an external Schottky diode. The device features a VBAT pin, which allows the use of two AA cells to charge the capacitor. The internal circuitry operates from the VIN pin. The LT3485-0 has a primary current limit of 1.4A, where...