The LT ®3468/LT3468-1/LT3468-2 are highly integrated ICs designed to charge photoflash capacitors in digital and film cameras.
The LT3468, LT3468‑1 and LT3468‑2 are highly integrated ICs that charge photoflash capacitors for digital and film cameras, PDA/phone flashes and emergency strobes. They operate from a single Li‑ion cell or any supply between 2.5 V and 16 V and use a tiny low‑profile TSOT‑23 package.
The devices include an on‑chip high‑voltage NPN power switch, output‑voltage detection without external zeners, and adjustable output voltage set by the transformer turns ratio. Pin functions, typical performance curves, and transformer design guidelines are provided for designers.
| Switch Current Limit (LT3468‑1) | 0.7 A |
|---|---|
| Switch Current Limit (LT3468‑2) | 1.0 A |
| Quiescent Current (no load) | 8 mA (typical) |
| Package Type | 5‑Lead Plastic TSOT‑23 |
LT3468‑1 is limited to a peak switch current of 0.7 A.
The output voltage is set by changing the transformer turns ratio N.
Driving the CHARGE pin low puts the part into shutdown.