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TPS65270PWPR Datasheet(PDF) 1 Page - Texas Instruments |
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TPS65270PWPR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 25 page TPS65270 www.ti.com SLVSAX7C – AUGUST 2011 – REVISED APRIL 2012 4.5-V TO 18-V INPUT VOLTAGE, 2-A/3-A OUTPUT CURRENT, DUAL SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET Check for Samples: TPS65270 1 FEATURES 2 • Wide Input Supply Voltage Range • Available in 24-Lead Thermally Enhanced (4.5 V - 18 V) HTSSOP (PWP) and QFN 4-mm x 4-mm (RGE) Packages • 0.8 V, ±1% Accuracy Reference • Up to 2-A (Buck 1) and 3-A (Buck 2) Maximum APPLICATIONS Continuous Output Loading Current • DTV • Low Power Pulse Skipping Mode to Achieve • DSL Modems High Light Load Efficiency • Cable Modems • Adjustable Switching Frequency 300 kHz - 1.4 MHz Set by External Resistor • Set Top Boxes • Dedicated Enable and Soft-Start for Each Buck • Car DVD Players • Peak Current-Mode Control with Simple • Home Gateway and Access Point Networks Compensation Circuit • Wireless Routers • Cycle-by-Cycle Over Current Protection • 180° Out-of-Phase Operation to Reduce Input Capacitance and Power Supply Induced Noise DESCRIPTION/ORDERING INFORMATION The TPS65270 is a monolithic dual synchronous buck regulator with wide operating input voltage that can operate in 5-, 9-, 12- or 15-V bus voltages and battery chemistries. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application. The TPS65270 features a precision 0.8-V reference and can produce output voltages up to 15 V. Each converter features enable pin that allows dedicated control each channel that provide flexibility for power sequencing. Soft- start time in each channel can be adjustable by choosing different external capacitors. Constant frequency peak current mode control simplifies the compensation and provides fast transient response. Cycle-by-Cycle over current protection and hiccup mode operation limit MOSFET power dissipation in short circuit or over loading fault conditions. Low side reverse current protection also prevents excessive sinking current from damaging the converter. The switching frequency of the converters can be set from 300 KHz to 1.4 MHz with an external resistor. Two converters have clock signal with 180° out-of-phase so as to minimize the input filter requirements and alleviate EMI and input capacitor requirements. TPS65270 also features a light load pulse skipping mode (PSM). The PSM mode allows a power loss reduction on the input power supplied to the system at light loading in order to achieve light load high efficiency. The TPS65270 is available in a 24-Lead thermally enhanced HTSSOP (PWP) package and 24-pin QFN 4-mm x 4-mm (RGE) package. 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. 2 PowerPAD is a trademark of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2011–2012, 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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