TPS65279V Datasheet, PDF (1/43 Pages) Texas Instruments – 4.5-V TO 18-V INPUT VOLTAGE, 5-A/5-A DUAL SYNCHRONOUS STEP-DOWN CONVERTER WITH I2C CONTROLLED VID AND CURRENT SHARING

TPS65279V
www.ti.com
SLVSBW1A – FEBRUARY 2013 – REVISED JUNE 2013
4.5-V TO 18-V INPUT VOLTAGE, 5-A/5-A DUAL SYNCHRONOUS STEP-DOWN
CONVERTER WITH I²C CONTROLLED VID AND CURRENT SHARING
Check for Samples: TPS65279V
FEATURES
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• 4.5-V to 18-V Wide Input Voltage Range
• I²C Controlled 7-Bits VID Programmable
Output Voltage from 0.68 V to 1.95 V with
10-mV Steps for Each Buck; Output Voltage
Can Also be Set By Resistor Divider
• Programmable Slew Rate Control for Output
Voltage Transition
• Up to 5-A Maximum Continuous Output
Current in Buck 1 and Buck 2
• Buck 1 and Buck 2 can be Paralleled to Deliver
up to 10-A Current
• I²C Compatible Interface With Standard Mode
(100 kHz) and Fast Mode (400 kHz)
• I²C Read Back Power Good Status and Die
Temperature Warning
• Pulse Skipping Mode to Achieve High
Efficiency in Light Load
• Adjustable Switching Frequency
200 kHz - 1.6 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
• Over Temperature Protection
• Available in 32-Pin Thermally Enhanced
HTSSOP (DAP) and 36-Pin QFN 6-mm x 6-mm
(RHH) Packages
APPLICATIONS
• DTV
• TCON
• BDVD
• Set Top Boxes
• Tablet PC
DESCRIPTION/ORDERING INFORMATION
The TPS65279V is a monolithic dual synchronous buck regulator with wide 4.5-V to 18-V 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.
Each buck converter in TPS65279V has external feedback resistors that can be used for setting the initial start
up voltage. The feedback voltage reference for this start-up option is 0.6 V. Once the VID DAC is updated via the
I²C, the buck converter switches feedback resistors from external to internal. The output voltage in each buck
can be programmable from 0.68 V to 1.95 V in 10-mV steps with I²C Controlled 7-Bits VID.
Each buck converter in TPS65279V can also be I²C controlled for enabling/disabling output voltage, setting the
pulse skipping mode and reading the power good status and die temperature warning.
The switching frequency of the converters can be set from 200 kHz to 1.6 MHz with an external resistor. Two
converters have clock signal with 180° out-of-phase.
Two bucks in TPS65279V can be paralleled to deliver up to 10-A load current by floating the MODE pin. Two
phase operation in current sharing reduces system filtering capacitance and inductance, alleviates EMI and
improves output voltage ripple and noise.
TPS65279V features dedicated enable pin when I₂C interface is not used. Independent soft-start pin provides
flexibility in power up programmability. 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 over
current protection also prevents excessive sinking current from damaging the converter.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 © 2013, Texas Instruments Incorporated