TPS65276V Datasheet, PDF (1/42 Pages) Texas Instruments – 4.5-V TO 18-V INPUT VOLTAGE, 6-A/3.5-A DUAL SYNCHRONOUS STEP-DOWN CONVERTER WITH I2C CONTROLLED VID

TPS65276V
www.ti.com
SLVSBW0A – FEBRUARY 2013 – REVISED JUNE 2013
4.5-V TO 18-V INPUT VOLTAGE, 6-A/3.5-A DUAL SYNCHRONOUS STEP-DOWN
CONVERTER WITH I²C CONTROLLED VID
Check for Samples: TPS65276V
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 6-A Maximum Continuous Output
Current in Buck 1 and 3.5-A in Buck 2
• 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
TPS65276V is a monolithic dual synchronous buck converter with wide 4.5V to 18V operating input voltage
range that encompassed most intermediate bus voltage operating off 5-, 9-, 12- or 15-V power bus or battery.
The converter with constant frequency peak current mode control is designed to simplify its application while
giving the designers options to optimize their usage according to the target applications.
Each buck converter in TPS65276V 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 TPS65276V 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.
TPS65276V 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.
TPS65273V also features a light load pulse skipping mode (PSM) that can be controlled by I²C or MODE pin
configuration. The PSM mode allows a power loss reduction on the input power supplied to the system to
achieve high efficiency at light loading.
The TPS65273V is available in a 32-pin thermally enhanced HTSSOP (DAP) package and 36-pin QFN
6-mm x 6-mm (RHH) package.
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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