Texas Instruments TPS563900 Synchronous
Step-Down Regulators
Texas Instruments TPS563900 Synchronous Step-Down Regulators are a monolithic dual-synchronous buck converter with a wide 4.5V to 18V operating input-voltage range that can operate in 5, 9, 12, or 15V 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 0.6V. 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 0.68V to 1.95V with 10mV steps by I2C-controlled 7-bit VID.
Features
4.5V to 18V Wide Input Voltage Range
I2C Controlled 7-Bits VID Programmable Output Voltage from 0.68V to 1.95V with 10mV Steps for Each Buck; Output Voltage can also be Set by Resistor Divider
Programmable Slew-Rate Control for Output-Voltage Transition
Up to 3.5A Maximum Continuous Output Current in Buck 1 and Buck 2
Buck 1 and Buck 2 can be Paralleled to Deliver up to 7A Current
I2C Compatible Interface With Standard Mode (100kHz) and Fast Mode (400kHz)
I2C Read Back Power Good Status and Die Temperature Warning
Pulse-Skipping Mode to Achieve High Efficiency in Light Loads
Adjustable Switching Frequency
200kHz to 1.6MHz 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
