Analog Devices Inc. LTC3862HUH-2#TRPBF

Overview

LTC3862HUH-2#TRPBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving external N-channel MOSFETs. It operates from 5.5V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz programmable switching frequency, and features internal 10V and 3.8V LDOs for gate drive and analog circuitry-used in high-voltage industrial power supplies requiring tight regulation and multi-phase scalability.

For engineers reviewing the LTC3862HUH-2#TRPBF datasheet, LTC3862HUH-2#TRPBF pinout, LTC3862HUH-2#TRPBF application, or LTC3862HUH-2#TRPBF equivalent, key selection criteria include its 24-pin 5mm × 5mm QFN package with exposed PGND pad, ±1% reference accuracy, 180° inter-channel phase shift, programmable leading-edge blanking (210–375 ns), and H-grade temperature rating (–40°C to +150°C).

Technical Context

The LTC3862HUH-2#TRPBF implements fixed-frequency peak current mode control with dual independent channels operating 180° out-of-phase, reducing input/output ripple and filter component stress. Its error amplifier compares FB voltage against a 1.223V internal reference, modulating ITH to set peak inductor current per channel.

Two cascaded PMOS LDOs supply critical subsystems: INTVCC (10V, 50mA max) powers gate drivers, while 3V8 (3.8V) powers analog/digital control logic. UVLO thresholds (4.4V rising / 3.9V falling on INTVCC) enable safe operation with 6V-V_GS MOSFETs, and PHASEMODE/SYNC/CLKOUT support scalable 2-/3-/4-/6-/12-phase synchronization.

Key Specifications

Pinout & Package

Package: 24-lead (5mm × 5mm) plastic QFN (UH), thermally enhanced with exposed PGND pad soldered to PCB ground plane for optimal thermal dissipation (θ_JA = 44°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar two-phase boost/SEPIC controller applications.

Compared with LTC3862IUH-2#TRPBF and LTC3862EUH-2#TRPBF, the LTC3862HUH-2#TRPBF provides extended junction temperature capability (up to 150°C), making it the only option qualified for continuous operation in high-ambient automotive or industrial motor-control enclosures.

Availability

LTC3862HUH-2#TRPBF is available at Aetrix Electronics and suitable for industrial high-voltage power supplies, telecom 48V boost converters, and automotive ADAS camera power systems requiring stable component supply, long-term lifecycle assurance, and guaranteed H-grade thermal performance.

Supply support for LTC3862HUH-2#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for all Linear power management ICs.

The LTC3862 family was designed specifically for high-efficiency, multi-phase boost and SEPIC DC/DC conversion in industrial, telecom, and automotive applications demanding wide input range, precision regulation, and thermal robustness.

FAQ

What is the maximum operating junction temperature for the LTC3862HUH-2#TRPBF?

The LTC3862HUH-2#TRPBF is rated for operation from –40°C to +150°C junction temperature (H-grade). This specification is guaranteed across the full range, with thermal shutdown protection activated above 150°C. The 5mm × 5mm QFN package's exposed PGND pad must be soldered to a thermal pad on the PCB to achieve the specified θ_JA = 44°C/W and maintain reliable operation at maximum ambient conditions.

Can the LTC3862HUH-2#TRPBF be used in SEPIC topology?

Yes, the LTC3862HUH-2#TRPBF supports SEPIC operation using its two-phase current-mode architecture. Each channel independently controls one switch in the SEPIC power stage, enabling non-inverting buck-boost conversion with inherent input-output isolation. The controller's 96% maximum duty cycle, programmable slope compensation, and matched current sense thresholds ensure stable operation across wide input/output voltage ratios typical in SEPIC designs.

How does the PHASEMODE pin affect timing in multi-phase configurations?

The PHASEMODE pin on the LTC3862HUH-2#TRPBF selects inter-channel phase relationships: floating or grounded yields 180° CH1–CH2 offset, while connecting to 3V8 sets 120° offset. This directly determines ripple cancellation effectiveness and current sharing in multi-phase systems. When combined with SYNC/CLKOUT, it enables deterministic phase alignment across up to 12 phases-critical for minimizing input/output capacitor RMS current in high-power applications.

What is the purpose of the BLANK pin on the LTC3862HUH-2#TRPBF?

The BLANK pin on the LTC3862HUH-2#TRPBF configures minimum on-time to suppress false current-sense triggering during MOSFET turn-on. Connecting BLANK to SGND sets 210ns, floating gives 290ns, and tying to 3V8 extends it to 375ns. This adjustment ensures accurate current sensing across varying gate drive strengths and MOSFET parasitics-especially important in high-frequency, high-dV/dt boost applications where noise immunity is critical.

Is the INTVCC pin on the LTC3862HUH-2#TRPBF intended to power external circuitry?

No, the INTVCC pin on the LTC3862HUH-2#TRPBF is strictly for internal gate driver supply and must not power external components. It sources up to 50mA but cannot sink current. In multi-phase systems, paralleling INTVCC outputs causes thermal imbalance-each IC's INTVCC must be independently bypassed to its local PGND. External bias requirements should be met using dedicated regulators, not INTVCC.