Analog Devices Inc. LT8210AUJ-1#TRPBF

Overview

LT8210AUJ-1#TRPBF from Analog Devices is a 100V input/output synchronous 4-switch multiphase buck-boost DC/DC controller supporting pass-thru, CCM, and DCM operation. It delivers ±2% output voltage accuracy across –40°C to 125°C, features 10V quad N-channel gate drivers, and enables masterless current sharing across parallel phases. Used in high-reliability industrial power supplies where wide VIN/VOUT range and reverse input protection to –40V are required.

For engineers reviewing the LT8210AUJ-1#TRPBF datasheet, LT8210AUJ-1#TRPBF pinout, LT8210AUJ-1#TRPBF application, or LT8210AUJ-1#TRPBF equivalent, key selection criteria include programmable pass-thru window, cycle-by-cycle inductor current limiting (±20%), spread-spectrum EMI reduction, reverse input disconnect threshold at –1.2V, and IMON-based current sharing with <5mV mismatch at 50mV sense differential.

Technical Context

The LT8210AUJ-1#TRPBF implements dual-loop regulation: FB1 controls boost-mode output during VIN < 0.84·VOUT, FB2 controls buck-mode output during VIN > 1.19·VOUT, and both loops coordinate in buck-boost region (0.84·VOUT < VIN < 1.19·VOUT). Its IMON pin provides a 90µA current output proportional to SNSP2–SNSN2 differential voltage for precise average current monitoring and masterless phase balancing.

Pass-thru mode operates when VIN falls within a user-programmable window (e.g., 8V–16V), bypassing switching entirely to achieve 99.9% efficiency and eliminate switching noise. Transition between modes is seamless, with no top MOSFET refresh noise in either buck or boost regions, and reverse input protection down to –40V is implemented using an external N-channel MOSFET controlled by the DG pin.

Key Specifications

Pinout & Package

LT8210AUJ-1#TRPBF is housed in a thermally enhanced 40-lead (6mm × 6mm) QFN package with exposed pad for PCB heat sinking. Pin 1 is SYNC/SPRD; Pin 2 is PWGD; Pin 3 is RT; Pin 5 is VDD; Pin 6 is SS; Pin 7 is IMON; Pins 8 and 9 are VC1 and VC2 compensation nodes; Pins 10 and 11 are FB2 and FB1 feedback inputs; Pins 13–16 are TG1/SW1/BST1/NC; Pins 21–24 are TG2/SW2/BST2/NC; Pins 26–27 are MODE1/MODE2; Pin 29 is EN/UVLO; Pins 30–31 are VIN/DG; Pins 32–33 are VINP/NC; Pins 34–35 are SNSP1/FB1; Pins 36–39 are NC/SNSN2/SNSP2/NC; Pin 40 is GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck-boost controller applications.

Compared with LTC7813EUFD#PBF and LT8705IUHF#PBF, the LT8210AUJ-1#TRPBF uniquely integrates pass-thru mode, reverse input protection, and IMON-based masterless current sharing in a single 100V-rated controller-enabling higher efficiency, lower EMI, and scalable output current without external components or layout changes.

Availability

LT8210AUJ-1#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, avionics converters, and automotive 12V/48V interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LT8210AUJ-1#TRPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The LT8210 product line delivers high-voltage synchronous buck-boost controllers for demanding applications where input voltage may exceed, fall below, or equal the output-targeting industrial, telecom, avionics, and automotive systems needing robustness, efficiency, and scalability.

FAQ

What is the maximum input voltage rating for the LT8210AUJ-1#TRPBF?

The LT8210AUJ-1#TRPBF has an absolute maximum input voltage rating of 100V on both VIN and VINP pins, with operational range from 2.8V to 100V after start-up (4.5V minimum for initial start-up). This enables direct use in 48V, 72V, and 96V industrial battery systems without pre-regulation. The device also tolerates reverse input down to –40V when configured with the DG pin and external N-MOSFET.

How does the LT8210AUJ-1#TRPBF implement pass-thru mode and what is its efficiency benefit?

The LT8210AUJ-1#TRPBF implements pass-thru mode by disabling all four power switches when VIN falls within a user-programmable window (e.g., 8V–16V), routing input directly to output. This eliminates switching losses and EMI generation, achieving 99.9% efficiency. The LT8210AUJ-1#TRPBF's 18μA quiescent current in this mode further minimizes standby power consumption in always-on systems.

Can multiple LT8210AUJ-1#TRPBF controllers be paralleled, and how is current sharing achieved?

Yes, multiple LT8210AUJ-1#TRPBF controllers can be paralleled for higher output current and reduced ripple. Current sharing is achieved via the IMON pin, which sources a current proportional to the SNSP2–SNSN2 differential voltage. Connecting IMON pins together through 11kΩ resistors establishes a masterless closed-loop sharing scheme with <5mV mismatch at 50mV sense differential, enabling automatic phase shedding and balanced loading.

What is the function of the DG pin on the LT8210AUJ-1#TRPBF and how is it used for reverse input protection?

The DG pin on the LT8210AUJ-1#TRPBF controls an external N-channel MOSFET to provide reverse input protection down to –40V. When VIN drops below –1.2V (typical), the DG pin pulls low, turning off the series MOSFET and disconnecting the input. The LT8210AUJ-1#TRPBF's DG pin features 8.5V drive capability (VDG–VIN) and 130mA pull-down current, ensuring robust gate control under fault conditions without external level-shifting circuitry.

Does the LT8210AUJ-1#TRPBF support synchronization to an external clock, and what is the valid frequency range?

Yes, the LT8210AUJ-1#TRPBF supports external clock synchronization via the SYNC/SPRD pin (Pin 1). It accepts an external clock signal between 80kHz and 400kHz, which the internal PLL locks to for precise frequency alignment across multiple phases. Alternatively, tying SYNC/SPRD to VDD enables spread-spectrum modulation for EMI reduction, while grounding disables both features and uses the RT-set frequency.