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TPS40304ADRCR Datasheet(PDF) 1 Page - Texas Instruments |
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TPS40304ADRCR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 18 page 5 4 3 2 6 7 8 9 BOOT HDRV SW LDRV/OC FB COMP PGOOD EN/SS TPS40304A 1 10 BP VDD PAD V IN SD V OUT V IN UDG-10008 V OUT GND TPS40304A www.ti.com SLUSA30 – FEBRUARY 2010 3-V TO 20-V INPUT SYNCHRONOUS BUCK CONTROLLER Check for Samples: TPS40304A 1 FEATURES CONTENTS • Input Voltage Range from 3 V to 20 V Device Ratings 2 • Fixed 600-kHz Switching Frequency Electrical Characteristics 3 • High- and Low-Side FET RDS(on) Current Device Information 8 Sensing Application Information 10 • Programmable Thermally Compensated OCP Additional References 13 Levels X • Programmable Soft-Start • 591-mV, 1% Reference Voltage APPLICATIONS • Voltage Feed-Forward Compensation • POL Modules • Supports Pre-Biased Output • Printer • Frequency Spread Spectrum • Digital TV • Thermal Shutdown Protection at 145°C • Telecom • 10-Pin 3 mm × 3 mm SON Package with Ground Connection to Thermal Pad DESCRIPTION The TPS40304A is a cost-optimized synchronous buck controller that operates from 3-V to 20-V input. The controller implements a voltage-mode control architecture with input-voltage feed-forward compensation that responds instantly to input voltage change. The switching frequency is fixed at 600 kHz. Frequency Spread Spectrum feature adds dither to the switching frequency, significantly reducing the peak EMI noise and making it much easier to comply with EMI standards. The TPS40304A offers design with a variety of user programmable functions, including soft-start, overcurrent protection (OCP) levels, and loop compensation. The OCP level is programmed by a single external resistor connected from LDRV pin to circuit ground. During initial power on, the TPS40304A enters a calibration cycle, measures the voltage at the LDRV pin, and sets an internal OCP voltage level. During operation, the programmed OCP voltage level is compared to the voltage drop across the low-side FET when it is on to determine whether there is an overcurrent condition. The TPS40304A then enters a shutdown and restart cycle until the fault is removed. SIMPLIFIED APPLICATION DIAGRAM 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 data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2010, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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