TPS40042

TPS40042 www.ti.com SLUS777 – NOVEMBER 2007 LOW PIN COUNT, LOW VIN (3.0 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH EXTERNAL REFERENCE INPUT FEATURES 1 2 3.0-V to 5.5-V Input External Reference required: 0.5 V to 1.5 V Output Voltage from REFIN to 90% of VIN High-Side Drive for N-Channel FET Supports Pre-Biased Outputs Adaptive Anti-Cross Conduction Gate Drive Fixed switching frequency (600 kHz) Voltage Mode Control Three Selectable Short Circuit Protection Levels Hiccup Restart from Faults Active Low Enable Thermal Shutdown Protection at 145°C 10-Pin, 3-mm x 3-mm SON (DRC) APPLICATIONS DDR Memory Point of Load Telecommunications DC to DC Modules CONTENTS Device Ratings 2 Electrical Characteristics 4 Device Information 8 Application Information 10 Design Examples 18 Additional References 28 DESCRIPTION The TPS40042 DC/DC controller is designed to operate with an input source between a 3.0 V and 5.5 V. To reduce the number of external components, a number of operating parameters are fixed internally. The operating frequency for example, is internally set at 600 kHz. (Continued) VIN Reference Input Enable TPS40042 1 REFIN HDRV 10 2 EN SW 9 3 FB BOOT 8 4 COMP LDRV 7 5 VDD GND 6 VOUT UDG-07141 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this dat...