ELECTRICAL SPECIFICATIONS
LT1949-1 1.1MHz, 1A Switch PWM DC/DC Converter June 2000 DESCRIPTIO FEATURES
s s s s s s s s 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 U APPLICATIO S s s s s s 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, 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. 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 LT1949-1 includes a low-battery detector that stays alive when the device goes into shutdown. Quiescent current in shutdown is 50µA, while operating current is 8mA. , LTC and LT are registered trademarks of Linear Technology Corporation.
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