LT8722
Info : RECOMMENDED FOR NEW DESIGNS
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LT8722

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 1
1ku List Price Starting From $7.76
Features
  • 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
  • Integrated 4A Power Switches
  • Silent Switcher® Architecture
  • Analog Output for Diagnostics/Telemetry
  • Adjustable and Synchronizable: 500kHz to 3MHz
  • Small 3mm × 3mm 18-Lead LQFN
Additional Details
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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
Part Models 1
1ku List Price Starting From $7.76

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8722AV#PBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC3145A

LT8722 | Monolithic Thermoelectric Cooler Driver

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DC3145A

LT8722 | Monolithic Thermoelectric Cooler Driver

LT8722 | Monolithic Thermoelectric Cooler Driver

Product Detail

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.

Tools & Simulations

Tools & Simulations 1

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.

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