Analog Devices Inc. LTC4089EDJC-5#TRPBF

Overview

LTC4089EDJC-5#TRPBF from Analog Devices is a USB power manager with integrated high-voltage switching Li-Ion battery charger. It delivers fixed 5V output from 6V–36V HVIN to charge single-cell batteries, supports programmable 465–1080mA charge current (RPROG = 100k–50k), features NTC thermistor monitoring, and provides C/10 end-of-charge detection - used in portable GPS receivers, cameras, and MP3 players requiring seamless multi-source power arbitration.

For engineers reviewing the LTC4089EDJC-5#TRPBF datasheet, LTC4089EDJC-5#TRPBF pinout, LTC4089EDJC-5#TRPBF application, or LTC4089EDJC-5#TRPBF equivalent, key selection criteria include its fixed 5V HVOUT regulation (vs adaptive LTC4089), 22-pin DFN package thermal performance, HVIN undervoltage lockout at 4.7–5.0V, and dual-mode USB input current limiting (100%/20% via HPWR pin).

Technical Context

The LTC4089EDJC-5#TRPBF implements a constant-frequency (685–815kHz) current-mode buck regulator for high-voltage input (6–36V), delivering regulated 4.85–5.15V HVOUT to drive the battery charging path. Its PowerPath™ architecture prioritizes HVIN over USB IN, disables IN-to-OUT conduction when HVIN is active, and enforces load-dependent charge current reduction to maintain total input current compliance.

It integrates a precision 4.2V ±0.8% float voltage reference, programmable charge timer (via TIMER capacitor), thermal regulation (105°C junction limit), and NTC-based cold/hot fault detection (0.74×VNTC / 0.29×VNTC thresholds). The internal 215mΩ ideal diode enables low-loss BAT-to-OUT power delivery when external supplies are absent.

Key Specifications

Pinout & Package

22-pin plastic DFN (6mm × 3mm, 0.75mm height) with exposed thermal pad (Pin 23 = GND). Requires soldering of exposed pad to PCB ground plane for thermal management 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 LTC4089EDJC#TRPBF, the LTC4089EDJC-5#TRPBF trades adaptive HVOUT for guaranteed 5V output - simplifying system design where fixed gate drive or 5V rail stability is mandatory. Versus BQ24075RGTR, it adds HVIN support, NTC monitoring, and PowerPath™ arbitration - essential for ruggedized or multi-supply portable equipment.

Availability

LTC4089EDJC-5#TRPBF is available at Aetrix Electronics and suitable for portable GPS receivers, digital cameras, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for LTC4089EDJC-5#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 consumer markets.

The LTC4089/LTC4089-5 product line was designed specifically for USB-peripheral devices needing intelligent multi-source power arbitration, robust Li-Ion charging, and seamless battery backup - targeting portable instrumentation and field-deployable electronics.

FAQ

What is the primary function of the LTC4089EDJC-5#TRPBF?

The LTC4089EDJC-5#TRPBF is a USB power manager with integrated high-voltage switching Li-Ion battery charger. It manages power arbitration between USB (IN), high-voltage sources (6–36V HVIN), and a single-cell Li-Ion battery (BAT), delivering regulated 5V output (HVOUT) to charge the battery and power the system load (OUT). Its fixed 5V HVOUT distinguishes it from the adaptive-output LTC4089EDJC#TRPBF.

How does the LTC4089EDJC-5#TRPBF handle USB current limiting?

The LTC4089EDJC-5#TRPBF uses the HPWR pin and CLPROG resistor to implement dual-mode USB current limiting: when HPWR ≥2.3V, input current is set to 100% of the CLPROG-programmed limit (e.g., 500mA with RCLPROG = 2kΩ); when HPWR ≤0.3V, it drops to 20% (e.g., 100mA). This satisfies USB 2.0 suspend and active mode requirements without external logic or firmware.

What is the role of the NTC pin on the LTC4089EDJC-5#TRPBF?

The NTC pin on the LTC4089EDJC-5#TRPBF interfaces directly with a thermistor-resistor divider to monitor battery temperature. It triggers automatic charge suspension if voltage falls below 0.29×VNTC (hot fault, ~50°C) or rises above 0.74×VNTC (cold fault, ~0°C), with ~3°C hysteresis. Connecting NTC to GND disables all thermal monitoring - a hardware-configurable safety feature.

Can the LTC4089EDJC-5#TRPBF operate without an external inductor?

No - the LTC4089EDJC-5#TRPBF requires an external 10µH inductor connected between SW and HVOUT to implement its high-voltage buck regulator. The inductor is fundamental to energy transfer in the 685–815kHz switching loop; omitting it prevents HVIN-to-HVOUT regulation and disables battery charging from high-voltage sources. USB-only operation (IN→OUT) remains functional but excludes HVIN path.

What thermal considerations apply to the LTC4089EDJC-5#TRPBF in continuous operation?

The LTC4089EDJC-5#TRPBF features thermal regulation that reduces charge current above 105°C junction temperature and includes overtemperature protection (TJMAX = 110°C). Its 22-pin DFN package requires soldering the exposed pad (Pin 23) to a PCB ground plane with multiple vias to achieve θJA = 40°C/W. At 1.2A charge current and 24V HVIN, board layout and copper area directly impact sustained power delivery capability.