TPS65270 Datasheet, PDF (1/25 Pages) Texas Instruments – 4.5-V TO 18-V INPUT VOLTAGE, 2-A/3-A OUTPUT CURRENT, DUAL SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET

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
FEATURES
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•2 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
• 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
APPLICATIONS
• DTV
• DSL Modems
• Cable Modems
• Set Top Boxes
• Car DVD Players
• Home Gateway and Access Point Networks
• Wireless Routers
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.
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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.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2012, Texas Instruments Incorporated