Analog Devices Inc. LTC4089EDJC-1#TRPBF

Overview

LTC4089EDJC-1#TRPBF from Analog Devices is a USB power manager with integrated high-voltage switching Li-Ion battery charger. It manages power routing among USB (IN), 6–36V HVIN, and single-cell Li-Ion battery (BAT), enforcing programmable input current limits (500mA/100mA), delivering fixed 5V output (±1.5% over load/temp), and supporting thermal regulation via NTC input. It is used in portable GPS receivers, MP3 players, and PDAs requiring seamless source transition and load-dependent charging.

For engineers reviewing the LTC4089EDJC-1#TRPBF datasheet, LTC4089EDJC-1#TRPBF pinout, LTC4089EDJC-1#TRPBF application, or LTC4089EDJC-1#TRPBF equivalent, key selection criteria include its dual-input priority control (HVIN > USB), C/10 end-of-charge detection, 4.1V ±0.8% float voltage accuracy, 215mΩ internal ideal diode, and 22-pin DFN package with exposed thermal pad.

Technical Context

The LTC4089EDJC-1#TRPBF implements a constant-current/constant-voltage (CC/CV) charge algorithm with programmable total charge time via TIMER capacitor and automatic recharging at VFLOAT −100mV. Its high-voltage buck regulator operates at 750kHz (typ) with 88–95% duty cycle and supports up to 1.2A charge current while maintaining thermal feedback for safe operation up to 105°C junction temperature.

Input current limiting is dynamically coordinated across IN and HVIN paths: USB current is set by CLPROG resistor and HPWR logic (100% or 20% of ICL), while HVIN path uses internal 1.95A switch with 330mV saturation voltage. The device integrates an NTC thermistor interface (VNTC bias, cold/hot thresholds defined by ratios), CHRG open-drain status output, and HVPR active-low high-voltage present indicator.

Key Specifications

Pinout & Package

Package: 22-lead plastic DFN (6mm × 3mm × 0.75mm), exposed thermal pad (Pin 23) soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB power management and Li-Ion charging applications.

Compared with BQ24075RGTR and MAX1555ESA+, the LTC4089EDJC-1#TRPBF uniquely supports 6–36V HVIN with priority arbitration, programmable current limits, and NTC-based thermal qualification-making it essential for ruggedized, multi-source portable equipment.

Availability

LTC4089EDJC-1#TRPBF is available at Aetrix Electronics and suitable for portable GPS receivers, USB-powered MP3 players, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant packaging.

Supply support for LTC4089EDJC-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and medical markets.

The LTC4089EDJC-1#TRPBF belongs to the PowerPath™ family of battery charging and power management ICs, designed specifically for USB-hosted portable devices that require seamless multi-source power arbitration and safe, intelligent Li-Ion charging.

FAQ

What is the maximum allowable input voltage on the HVIN pin of the LTC4089EDJC-1#TRPBF?

The absolute maximum rating for HVIN is 40V, but the specified operating range is 6V to 36V. Operation above 36V risks violating the device's electrical specifications and may trigger undervoltage lockout or damage. For reliable performance, maintain HVIN within 6–36V per the datasheet, with 12V and 24V being common use cases in automotive and industrial adapters. The LTC4089EDJC-1#TRPBF includes internal protection against transient overvoltage events within this range.

How does the LTC4089EDJC-1#TRPBF handle simultaneous presence of USB (IN) and high-voltage (HVIN) inputs?

The LTC4089EDJC-1#TRPBF implements strict priority arbitration: HVIN takes precedence over IN. When HVIN exceeds its 4.7V UVLO threshold, the IN-to-OUT power path is automatically disconnected, HVPR goes low, and HVOUT powers the battery charger. This ensures higher-efficiency charging and system operation from the more capable source. The LTC4089EDJC-1#TRPBF maintains seamless transition without output disruption or software intervention.

Can the LTC4089EDJC-1#TRPBF charge a Li-Ion battery while powering a load from the same battery?

No-the LTC4089EDJC-1#TRPBF does not support concurrent charging and discharging of the same battery. When external power (IN or HVIN) is present, it supplies the load via OUT and charges the battery via BAT. When external power is removed, the battery powers the load through the internal ideal diode-but charging stops immediately. The LTC4089EDJC-1#TRPBF prevents reverse current flow into the charger circuitry to ensure safety and reliability.

What is the purpose of the GATE pin on the LTC4089EDJC-1#TRPBF, and how is it used?

The GATE pin drives the gate of an external P-channel MOSFET placed between BAT (drain) and OUT (source), reducing the effective forward voltage drop below the internal 215mΩ ideal diode's 60mV at 600mA. This lowers power loss during battery backup mode. When unused, GATE must be left floating-no pull-up/down is required. The LTC4089EDJC-1#TRPBF provides gate drive compatible with standard logic-level PFETs, and proper layout minimizes ringing and shoot-through.

Does the LTC4089EDJC-1#TRPBF support battery temperature monitoring, and how is it implemented?

Yes-the LTC4089EDJC-1#TRPBF includes a dedicated NTC thermistor interface with VNTC bias (4.85V) and ratio-based fault thresholds (0.326×VNTC for hot, 0.738×VNTC for cold). A resistor divider from VNTC to NTC and NTC to GND sets the measurement range. Charging pauses if temperature falls outside the valid window and resumes automatically upon return. This implementation is integral to the LTC4089EDJC-1#TRPBF's safety architecture and requires no external ADC or MCU polling.