TPS65270PWPR

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. Softstart time in each channel can be adjustable by choosing different external capacitors. TPS65270 is also able to startup with a pre-biased output. The converter begins switching when output voltage reaches pre-biased voltage. 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.

Applications

• DTV DSL Modems
• Cable Modems
• Set Top Boxes
• Car DVD Players
• Home Gateway and Access Point Networks
• Wireless Routers

Key features

• Wide Input Supply Voltage Range (4.5 V - 18 V)
• 0.8 V, ±1% Accuracy Reference
• Up to 2-A (Buck 1) and 3-A (Buck 2) Maximum Continuous Output Loading Current
• Low Power Pulse Skipping Mode to Achieve High Light Load Efficiency
• Adjustable Switching Frequency 300 kHz - 1.4 MHz Set by External Resistor
• Startup with a Pre-Biased Output Voltage
• Dedicated Enable and Soft-Start for Each Buck
• Peak Current-Mode Control with Simple Compensation Circuit
• Cycle-by-Cycle Over Current Protection
• 180° Out-of-Phase Operation to Reduce Input Capacitance and Power Supply Induced Noise
• Available in 24-Lead Thermally Enhanced HTSSOP (PWP) and QFN 4-mm x 4-mm (RGE) Packages