DESCRIPTION
The LT ®1949-1 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 LT1949-1 is ideal for generating bias voltages for large screen LCD panels. Constant frequency 1.1MHz operation results in a low noise output that is easy to filter and the 30V switch rating allows output voltage up to 28V using a single inductor. The high switching frequency allows the use of ceramic output capacitors. An external compensation pin gives the user flexibility in optimizing loop compensation, allowing small, low ESR ceramic capacitors to be used at the output. The 8-lead MSOP package ensures a low profile overall solution.

FEATURES
■ 1A, 0.5Ω, 30V Internal Switch
■ 1.1MHz Fixed Frequency Operation
■ Operates with VIN as Low as 1.5V
■ Low-Battery Detector Stays Active in Shutdown
■ Low VCESAT Switch: 410mV at 800mA
■ Pin-for-Pin Compatible with the LT1317B
■ Uses Ceramic Capacitors
■ Small 8-Lead MSOP Package

APPLICATIONS
■ LCD Bias Supplies
■ GPS Receivers
■ Battery Backup
■ Portable Electronic Equipment
■ Diagnostic Medical Instrumentation