LTC3429B

LTC3429/LTC3429B 600mA, 500kHz Micropower Synchronous Boost Converter with Output Disconnect U U FEATURES ■ Up to 96% Efficiency ■ True Output Load Disconnect ■ Inrush Current Limiting and Internal Soft-Start ■ Low Voltage Start-Up: 0.85V ■ Automatic Burst Mode® Operation with IQ ~ 20µA ■ Continuous Switching at Light Loads (LTC3429B) ■ Internal Synchronous Rectifier ■ Current Mode Control with Internal Compensation ■ Short-Circuit Protection ■ 500kHz Fixed Frequency Switching ■ Input Range: 0.5V to 4.4V ■ Output Range: 2.5V to 4.3V (Up to 5V with Schottky) ■ Shutdown Current: <1µA ■ Antiringing Control Minimizes EMI ■ Tiny External Components ■ Low Profile (1mm) SOT-23 Package U APPLICATIO S ■ MP3 Players ■ Digital Cameras ■ LCD Bias Supplies ■ Handheld Instruments ■ Wireless Handsets ■ GPS Receivers DESCRIPTIO The LTC®3429/LTC3429B are high efficiency synchronous, fixed frequency, step-up DC/DC converters with true output load disconnect, inrush current limiting and softstart in a low profile 6-lead ThinSOTTM package. These devices are capable of supplying 100mA from a single AA cell input or 250mA from a 2-cell AA with a 3.3V output. A switching frequency of 500kHz minimizes overall solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. Current mode PWM control with internal compensation reduces external parts count thereby saving critical board real estate. The LTC3429 shifts automatically to power saving Burst Mode operation at l...