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Analog Devices Inc. LT8722AV#PBF
- Part No.:
- LT8722AV#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LT8722AV#PBF.pdf
- Description:
- IC GATE DRVR FULL-BRIDGE 18QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,444
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Product details
Overview
LT8722AV#PBF from Analog Devices is a monolithic full-bridge DC/DC converter with hybrid PWM + linear drive architecture, delivering ±4A output current and ±13.5V differential voltage for TEC control in photonic systems. It integrates 25-bit DAC for output voltage control, dual 9-bit DACs for current limiting, and SPI interface operating up to 10MHz. Used in LiDAR mirror control and EDFA temperature regulation.
For engineers reviewing the LT8722AV#PBF datasheet, LT8722AV#PBF pinout, LT8722AV#PBF application, or LT8722AV#PBF equivalent, key selection criteria include its 3mm × 3mm LQFN-18 package, ±4A linear + PWM bridge capability, 25-bit voltage DAC resolution, 500kHz–3MHz adjustable switching frequency, and analog telemetry via AOUT pin for VIN/VOUT/IOUT/die temperature monitoring.
Technical Context
The LT8722AV#PBF implements a fixed-frequency current-mode full-bridge topology where one side (SFB) uses a PWM buck stage and the other (LDR) uses a linear NMOS stage-enabling single-inductor operation and fine bidirectional current control. Its internal architecture includes integrated 4A power switches (M1–M4), Silent Switcher® EMI reduction, and a charge pump for linear-stage gate drive.
SPI configuration governs all critical parameters: 25-bit output voltage setpoint (±13.819V range), positive/negative 9-bit current limits (±4A typical), power limit options (2W/3W/3.5W), and switching frequency (500kHz–3MHz with ±15% trim). Analog telemetry on AOUT supports real-time diagnostics of six selectable parameters with calibrated scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±4A continuous - enables direct driving of high-power TECs without external amplification |
| Output Voltage Range | ±13.819V differential - supports wide-range thermoelectric cooling/heating across industrial temperature gradients |
| Switching Frequency | 500kHz to 3MHz - adjustable via SPI; higher frequencies reduce inductor size but trade off efficiency and duty range |
| DAC Resolution | 25-bit voltage DAC + dual 9-bit current DACs - provides sub-mV voltage control and ~13.3mA current step resolution |
| Package | 3mm × 3mm, 18-lead LQFN - exposes thermal pad (pins 19–22) for low-θJA thermal management in compact optical modules |
| Input Voltage Range | 3.1V to 15V on VIN - accommodates 5V, 12V, and 15V system rails while maintaining full ±4A output capability |
| SPI Interface Speed | Up to 10MHz clock - enables fast register readback and real-time closed-loop control loop updates |
Pinout & Package
LT8722AV#PBF is housed in an 18-lead 3mm × 3mm LQFN package with exposed thermal pad (pins 19–22 soldered to PCB ground plane). Pin functions are validated per Analog Devices' Rev. B datasheet and confirmed on official pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (4,11) | Main power input | Supplies both PWM and linear stages; requires dual 4.7μF + 0.1μF bypassing per pin for stability |
| GND (5,10,21,22) | Ground reference | Four dedicated ground pins plus exposed thermal pad ensure low-impedance return and thermal dissipation |
| LDR (8,9) | Linear driver output | Differential output node for TEC/PIC load; tied together externally; supports ±4A sourcing/sinking |
| SFB (12) | PWM feedback input | Regulates buck stage output; sets VSFB/VIN ratio (10%–93% range) to define VOUT = VLDR − VSFB |
| AOUT (20) | Analog telemetry output | Configurable SPI-selectable monitor (VIN, VOUT, IOUT, die temp, etc.) with calibrated scaling for ADC interfacing |
| SCK/MOSI/MISO/CS (16,17,18,15) | SPI interface | Full-duplex 4-wire interface; SCK up to 10MHz; CS active-low enables serial communication |
| EN (19) | Global enable input | Hysteretic threshold (0.66V rising); device draws only 15μA in shutdown when EN and ENABLE_REQ are low |
| SWEN (13) | Switching enable control | Hardware-gated start-up control; pulled low internally during fault; requires ≥1.2V to initiate PWM operation |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid PWM + Linear Bridge | Single-inductor full-bridge operation eliminates need for dual inductors or H-bridge gate drivers in TEC applications |
| Silent Switcher® Architecture | Minimizes EMI emissions at high switching frequencies (up to 3MHz), easing compliance in sensitive optical subsystems |
| 25-Bit Output Voltage DAC | Enables <100μV LSB resolution over ±13.8V range-critical for stable sub-degree TEC temperature control |
| Integrated Diagnostics via AOUT | One analog pin multiplexes six monitored parameters with factory-calibrated scaling-reduces external sensing components |
| Adjustable Power Limit Options | Configurable 2W/3W/3.5W linear-stage power limits prevent thermal runaway during transient load conditions |
Applications
| TEC Temperature Control | LiDAR Beam Steering |
|---|---|
Use Scenario: Precise thermal stabilization of laser diodes in fiber-optic transceivers to maintain wavelength accuracy within ±0.1nm. IC Role / Device Role / Timing Role: Full-bridge TEC driver regulating heat flow bidirectionally using synchronized PWM (SFB) and linear (LDR) outputs. Use Value: 25-bit DAC resolution enables <0.01°C thermal setpoint stability; ±4A output handles high-thermal-mass TECs in DWDM systems. | Use Scenario: Driving electrostatic or piezoelectric actuators in solid-state LiDAR mirror assemblies requiring microsecond response and zero static power. IC Role / Device Role / Timing Role: High-bandwidth bidirectional voltage/current source controlling mirror position via differential analog output. Use Value: SPI-configurable 500kHz–3MHz switching allows optimization for actuator resonance; AOUT telemetry enables real-time position feedback calibration. |
| EDFA Thermal Management | Photonic Integrated Circuit (PIC) Biasing |
Use Scenario: Maintaining erbium-doped fiber amplifier gain flatness by stabilizing pump laser temperature across ambient shifts from –40°C to +85°C. IC Role / Device Role / Timing Role: Dual-stage driver delivering precise ±13.5V/±4A to TECs mounted directly on EDFA pump modules. Use Value: 125°C junction-rated operation ensures reliability in sealed optical enclosures; 92.6% efficiency at 4A reduces thermal load on passive heatsinks. | Use Scenario: Providing stable, low-noise bias voltage and current to phase shifters and modulators on silicon photonics chips. IC Role / Device Role / Timing Role: Low-EMI full-bridge source supplying programmable differential voltage with sub-mV ripple for analog PIC interfaces. Use Value: Silent Switcher® design prevents switching noise coupling into sensitive RF/photonic paths; SPI register access enables per-channel calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-bridge TEC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2955IMS#TRPBF | Supervisory IC with push-button reset and watchdog; no power stage or DACs; not a driver | System-level power sequencing only-not suitable for TEC load driving | Select LT8722AV#PBF for integrated TEC control; LTC2955 for standalone power management |
| MAX31865ATJ+T | RTD-to-digital converter with excitation current sources; no voltage/current drive capability | Temperature sensing only-lacks bidirectional power delivery or bridge topology | Use MAX31865 for precision RTD readout; LT8722AV#PBF for active thermal actuation |
Compared with LTC2955IMS#TRPBF and MAX31865ATJ+T, the LT8722AV#PBF uniquely integrates a full-bridge power stage, 25-bit voltage DAC, and SPI-configurable current limits-making it the only viable option among the three for closed-loop TEC temperature control in photonic systems.
Availability
LT8722AV#PBF is available at Aetrix Electronics and suitable for TEC temperature control, LiDAR beam steering, EDFA thermal regulation, and photonic integrated circuit biasing requiring stable component supply across industrial and optical communications programs.
Supply support for LT8722AV#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LT8722 product line delivers monolithic full-bridge TEC drivers with hybrid PWM-linear architecture, designed specifically for high-accuracy thermal control in optical subsystems including transceivers, amplifiers, and LiDAR.
FAQ
What is the maximum continuous output current of the LT8722AV#PBF?
The LT8722AV#PBF delivers ±4A continuous output current from its linear (LDR) and PWM (SFB) outputs. This is verified under conditions of VIN = 15V, fSW = 3MHz, and RLOAD = 2.5Ω, supporting high-power TEC loads in cooling and heating configurations. The device maintains this rating across its full –40°C to 125°C operating junction temperature range.
Does the LT8722AV#PBF require external gate drivers for its power switches?
No, the LT8722AV#PBF integrates all four power MOSFETs (M1–M4) and associated gate drive circuitry-including a charge pump for the linear-stage top NMOS and bootstrap regulator for the PWM top switch (M3). No external gate drivers are needed, simplifying layout and reducing bill-of-materials in space-constrained optical modules.
How is output voltage precision achieved in the LT8722AV#PBF?
The LT8722AV#PBF achieves output voltage precision through a 25-bit digital-to-analog converter (DAC) that sets the differential output (VOUT = VLDR − VSFB) with guaranteed monotonicity and ±900µV INL. This DAC drives an internal error amplifier with 0.969V/V gain, enabling ±13.819V range with sub-millivolt resolution-critical for sub-degree TEC temperature stability.
Can the LT8722AV#PBF synchronize its switching frequency to an external clock?
Yes, the LT8722AV#PBF supports external synchronization via the SYNC pin. When driven with a digital clock signal (20%–80% duty, frequency ≥30% of configured free-running frequency), the device locks its PWM oscillator to the external source-enabling EMI reduction through frequency dithering or alignment with system timing domains.
What thermal management features does the LT8722AV#PBF include?
The LT8722AV#PBF includes integrated overtemperature protection, configurable linear-stage power limits (2W/3W/3.5W), and a thermally enhanced 3mm × 3mm LQFN package with exposed pad (pins 19–22). Its junction temperature is rated to 125°C (LT8722A grade), and die temperature can be monitored in real time via the AOUT pin using the formula: Die Temp = (AOUT – 1.4207)/0.0047148.
LT8722AV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 18-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Full-Bridge
- Channel Type:
- Single
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 3.1V ~ 15V
- Logic Voltage - VIL, VIH:
- -
- Current - Peak Output (Source, Sink):
- 4A, 4A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-QFN (3x3)
LT8722AV#PBF FAQ
1.How can I place an order for LT8722AV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8722AV#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8722AV#PBF reliable?
The price and inventory of LT8722AV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8722AV#PBF is usually 5 days.
3.What payment methods are accepted for LT8722AV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8722AV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8722AV#PBF?
LT8722AV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8722AV#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8722AV#PBF?
For technical support, including LT8722AV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8722AV#PBF requirements.
6.How does Aetrix verify that LT8722AV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8722AV#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8722AV#PBF meets industry standards.
7.What is the process for return or replacement of LT8722AV#PBF?
All LT8722AV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8722AV#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8722AV#PBF part is unused and in its original packaging.
Return procedure for LT8722AV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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