Analog Devices Inc. LTC4089EDJC-3#TRPBF

Overview

LTC4089EDJC-3#TRPBF from Analog Devices is a USB power manager with integrated high-voltage Li-Ion battery charger. It delivers adaptive 3.95V float voltage, supports 6V–36V HVIN input, provides up to 1.2A charge current, and features internal ideal diode (215mΩ) for seamless power-path management in portable USB devices.

For engineers reviewing the LTC4089EDJC-3#TRPBF datasheet, LTC4089EDJC-3#TRPBF pinout, LTC4089EDJC-3#TRPBF application, or LTC4089EDJC-3#TRPBF equivalent, this page details its dual-input (USB + HV) power arbitration, temperature-qualified charging via NTC, programmable input current limit (500mA/100mA), and Bat-Track™ adaptive HV output control.

Technical Context

The LTC4089EDJC-3#TRPBF integrates a 750kHz current-mode buck regulator for high-voltage input (6V–36V), a USB-compliant input path with selectable 100%/20% current limit, and a constant-current/constant-voltage Li-Ion charger with ±0.8% float voltage accuracy. Its Bat-Track™ architecture maintains HVOUT at VBAT + 0.3V to minimize dropout loss during charging.

It implements thermal regulation (105°C junction shutdown), NTC-based temperature qualification (32.6% V_VNTC hot threshold), C/10 end-of-charge detection, and automatic recharging at 60–130mV below float voltage. The 22-lead DFN package includes exposed pad for thermal management (θ_JA = 4°C/W).

Key Specifications

Pinout & Package

Package: 22-lead (6mm × 3mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 23 = GND, must be soldered).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB power manager with HV charging applications.

Compared with BQ24075RGTR and LTC4098EDHC#TRPBF, the LTC4089EDJC-3#TRPBF uniquely combines wide HVIN range (6–36V), Bat-Track™ adaptive output, and JEITA-compliant NTC interface - making it the only option for ruggedized, multi-source portable devices requiring extended battery longevity at elevated temperatures.

Availability

LTC4089EDJC-3#TRPBF is available at Aetrix Electronics and suitable for GPS receivers, portable medical monitors, industrial scanners, and automotive diagnostic tools requiring stable component supply with guaranteed long-term availability.

Supply support for LTC4089EDJC-3#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 (now part of Analog Devices, Inc. following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management ICs.

The LTC4089 family was designed specifically for portable USB devices needing seamless multi-source power arbitration, extended Li-Ion battery life, and robust thermal safety - targeting GPS, medical wearables, and industrial handhelds.

FAQ

What is the exact float voltage of the LTC4089EDJC-3#TRPBF and why is it set to 3.95V?

The LTC4089EDJC-3#TRPBF has a factory-trimmed float voltage of 3.95V ±0.8%. This value is intentionally lower than standard 4.2V chargers to reduce cathode stress and electrolyte decomposition at elevated temperatures (>60°C), thereby improving long-term capacity retention-critical for devices deployed in hot environments like automotive cabins or industrial enclosures.

Does the LTC4089EDJC-3#TRPBF support true 6V–36V high-voltage input, and what protections apply?

Yes, the LTC4089EDJC-3#TRPBF supports 6V–36V HVIN with absolute maximum rating of 40V. It includes HVIN undervoltage lockout (4.7V rising), overvoltage clamping via internal circuitry, and thermal foldback that reduces charge current above 105°C junction temperature-ensuring reliable operation in automotive and industrial power rails.

How does the LTC4089EDJC-3#TRPBF manage power priority between USB (IN), HVIN, and battery (BAT)?

The LTC4089EDJC-3#TRPBF implements strict hardware-based priority: HVIN > IN > BAT. When HVIN is present and above UVLO, it powers OUT and charges BAT via HVOUT; IN is disconnected. If HVIN drops out, IN resumes powering OUT. Only when both are absent does the internal ideal diode connect BAT to OUT-enabling zero-interruption backup.

Can the LTC4089EDJC-3#TRPBF be used without an external NTC thermistor?

Yes-the NTC function is optional. To disable it, tie the NTC pin (Pin 5) directly to GND. This removes all temperature qualification: charging proceeds regardless of battery temperature. However, doing so voids JEITA compliance and risks unsafe charging outside 0°C–45°C, so it is recommended only for controlled lab environments.

What is the purpose of the GATE pin (Pin 10) on the LTC4089EDJC-3#TRPBF, and is it required?

The GATE pin (Pin 10) drives an external PFET between BAT (drain) and OUT (source) to reduce ideal diode forward drop. It is optional: the internal 215mΩ ideal diode functions without it. Use GATE only when <50mV forward drop is required at >1A load-e.g., in high-efficiency medical devices where every millivolt matters.