TPS563900_15 Datasheet, PDF (1/34 Pages) Texas Instruments – 4.5-V To 18-V Input Voltage, 3.5-A/3.5-A Dual Synchronous Step-Down Converter With I2C Controlled VID

TPS563900
www.ti.com
SLVSCC7 – DECEMBER 2013
4.5-V To 18-V Input Voltage, 3.5-A/3.5-A Dual Synchronous Step-Down Converter With I²C
Controlled VID
FEATURES
1
•2 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 3.5-A Maximum Continuous Output
Current in Buck 1 and Buck 2
• Buck 1 and Buck 2 can be Paralleled to Deliver
up to 7-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 Loads
• Adjustable Switching Frequency
200 kHz to 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 Overcurrent Protection
• 180° Out-of-Phase Operation to Reduce Input
Filter and Power Supply Conduced Noise
• Overtemperature Protection
• Available in 32-Pin Thermally Enhanced
HTSSOP (DAP) Package
APPLICATIONS
• DTV
• TCON
• BDVD
• Set Top Boxes
• Tablet PC
DESCRIPTION
The TPS563900 device is a monolithic dual-
synchronous buck converter with a wide 4.5-V to 18-
V operating input-voltage range that can operate in
5-, 9-, 12-, or 15-V bus voltages and battery
chemistries. Constant-frequency peak-current mode
control simplifies the loop compensation and provides
fast transient response.
External feedback resistors can be used to set the
initial start-up voltage for each buck converter in the
TPS563900 device. The feedback voltage reference
for this start-up option is 0.6 V. When the voltage-
identification (VID) DAC is updated through the I²C,
the buck converter switches the feedback resistors
from external to internal feedback resistors. The
output voltage in each buck is programmable from
0.68 V to 1.95 V with 10-mV steps by I²C-controlled
7-bit VID.
Each buck converter in the TPS563900 device can
also be I²C controlled for enabling and disabling the
output voltage, reading the output voltage, setting the
pulse skipping mode, and reading the power good
status and the warning of die temperature.
The TPS563900 device features a dedicated enable
pin when the I²C interface is not used. An
independent soft-start pin provides flexibility in power-
up programmability. Cycle-by-cycle overcurrent
protection and hiccup-mode operation limit MOSFET
power dissipation in short circuit or over-loading fault
conditions. Low-side reverse overcurrent protection
also prevents excessive sinking current from
damaging the converter.
The TPS563900 device also features a light-load
pulse-skipping mode (PSM) that can be controlled by
the 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 TPS563900 device is available in a 32-lead
thermally-enhanced HTSSOP (DAP) 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.
Eco-mode is a trademark of Texas Instruments.
2
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2013, Texas Instruments Incorporated