LT1946A

LT1946A 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start FEATURES s s s s s s s DESCRIPTIO 1.5A, 36V Internal Switch 2.7MHz Switching Frequency Integrated Soft-Start Function Adjustable Output from VIN to 35V Low VCESAT Switch: 300mV at 1.5A (Typical) 12V at 430mA from a 5V Input Small Thermally Enhanced 8-Lead MSOP Package U APPLICATIO S s s s s TFT-LCD Bias Supplies GPS Receivers DSL Modems Local Power Supply The LT®1946A is a fixed frequency step-up DC/DC converter containing an internal 1.5A, 36V switch. Capable of generating 12V at 430mA from a 5V input, the LT1946A is ideal for powering large TFT-LCD panels. The LT1946A switches at 2.7MHz, allowing the use of tiny, low profile inductors and low value ceramic capacitors. Loop compensation can be either internal or external, giving the user flexibility in setting loop compensation and allowing optimized transient response with low ESR ceramic output capacitors. Soft-start is controlled with an external capacitor which determines the input current ramp rate during start up. The 8-lead MSOP package and high switching frequency ensure a low profile overall solution less than 1.1mm high. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO VIN 5V 3 1 L1 2.2µH 6 VIN SHDN VC SS CSS 100nF 8 OFF ON C1 2.2µF RC 27.4k CC 270pF 5 SW D1 VOUT 12V 430mA R1 182k EFFICIENCY (%) 90 85 80 2 LT1946A FB 7 COMP GND* 4 R2 21k C2 2.2µF 75 70 65 60 C1: 2.2µF, X5R or X7R, 6.3V C2: 2...