The LT ®1949 is a fixed frequency step-up DC/DC converter with a 1A, 0.5Ω internal switch. Capable of generating 10V at 175mA from a 3.3V input, the LT1949 is ideal for generating bias voltages for large screen LCD panels.
The LT1949 is a current‑mode, fixed‑frequency step‑up DC/DC converter featuring a 1 A internal NPN power transistor, 600 kHz switching, and a low‑battery detector that stays active in shutdown. It is designed for applications such as LCD bias supplies, GPS receivers, and portable electronic equipment, delivering up to 10 V at 175 mA from a 3.3 V input.
The device is offered in small 8‑lead MSOP and SO packages, with detailed layout recommendations to minimize EMI. Electrical characteristics include a typical feedback voltage of 1.24 V, a switching frequency of 600 kHz, and an operating temperature range of –40 °C to 85 °C.
| Switch Vcesat (On‑Resistance) | 410 mV at 800 mA |
|---|---|
| Quiescent Current | 15 mA (typ) |
| Feedback Voltage | 1.24 V (typ) |
| Switching Frequency | 600 kHz (typ) |
It can generate 10 V at 175 mA from a 3.3 V input.
Yes, the low‑battery detector remains active in shutdown mode.
The converter operates at a fixed frequency of 600 kHz.
The part is offered in small 8‑lead MSOP and SO packages.