LT8722

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. B) Product Selection Table

Part Models: 1
1ku List Price: Starting From $7.76

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Overview

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, 15V_IN, f_SW = 3MHz
SPI Interface Allows User to:
- Set Output Regulation Voltage
- Set Output Current Limits
- Check Device Status
- Enable/Disable Output

Integrated 4A Power Switches
Silent Switcher^® Architecture
Analog Output for Diagnostics/Telemetry
Adjustable and Synchronizable: 500kHz to 3MHz
Small 3mm × 3mm 18-Lead LQFN

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 V_IN, V_OUT, I_OUT 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 V_TEC = ±13.5V/±4A with V_IN = 15V, f_SW = 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

Part Models: 1
1ku List Price: Starting From $7.76

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8722AV#PBF	18-Lead LQFN (3mm × 3mm × 0.95mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 1

LT8722 Application Software for Linduino

LT8722 Application Software (Rev. )

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Microcontrollers 1
ADuCM362	RECOMMENDED FOR NEW DESIGNS	Low Power, Precision Analog Microcontroller with Dual Sigma-Delta ADCs, ARM Cortex-M3

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT8722

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LT8722 | Monolithic Thermoelectric Cooler Driver

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Product Details

Demonstration circuit 3145A demonstrates a high efficiency thermoelectric cooler driver and features the LT8722 monolithic driver.

The input voltage range of the DC3145A is from 3.1V to 15V and the output is a SPI programmable differential voltage output. The maximum output current is 4A. The switching frequency SPI programmable from 500kHz to 3MHz.

The LT8722 is controlled through an SPI interface and therefore the demonstration circuit is also setup to interface through SPI. For demonstration purposes the manual provides instruction on how to connect the DC2026C Linduino board to monitor and control the DC3145A with a PC using a command line Arduino IDE interface.