Ultracompact 4A, 15V, Full Bridge Driver with SPI

The LT8722 is a high performance, high efficiency, monolithic full bridge DC/DC converter. One side of the full bridge is driven by a pulse width modulation (PWM) buck power stage, while the other side of the full bridge is driven by a linear power stage. The LT8722 can deliver up to ±54W1 of power to its load while only requiring a single inductor. An integrated 25-bit digital-to-analog converter (DAC) is used to control the LT8722 output voltage. Two additional 9-bit DACs control the positive and negative output current limits. An analog output telemetry pin can be used to monitor SPI selectable parameters such as VIN, VOUT, IOUT or the LT8722 junction temperature. The serial peripheral interface (SPI) can be used to configure and control the LT8722 allowing for flexibility to set the desired output voltage, output current limits, voltage limits, switching frequency and control ON/OFF behavior. The SPI operates at up to 10MHz allowing for fast readback and control. The LT8722 operates from a single 3.1V to 15V supply. Silent Switcher techniques are used to minimize EMI/EMC emissions while delivering high efficiency at high switching frequencies. The LT8722 is available in a 3mm × 3mm LQFN package.

1 VTEC = ±13.5V/±4A with VIN = 15V, fSW = 1MHz

APPLICATIONS

* Driving a Thermo Electric Cooler (TEC) with Fine Control

* Transmit Optical Sub-Assembly (TOSA) Cooling

* Erbium Doped Fiber Amplifier (EDFA) Temperature Regulation

* Photonic Integrated Circuit (PIC) Cooling

* LiDAR Mirror Control

* Motor Control

* 25-Bit Digital Output Voltage Control

* Wide Input Voltage Range: 3.1V to 15V

* ±4A Output Current

* High Output Power: Up to 54W1

* High Efficiency at High Frequency

* 92.6% Efficiency at 4A, 15VIN, fSW = 3MHz

* SPI Interface Allows User to:

* Set Output Regulation Voltage

* Set Output Current Limits

* Check Device Status

* Enable/Disable Output