Analog Devices Inc. LTC4089EDJC-1#PBF

Overview

LTC4089EDJC-1#PBF from Analog Devices is a USB power manager with integrated high-voltage (6V–36V) switching Li-Ion battery charger. It delivers 5V regulated output from HVIN, supports programmable 500mA/100mA USB input current limits, provides C/10 charge termination, and features NTC-based temperature-qualified charging for single-cell Li-Ion batteries in portable electronics.

For engineers reviewing the LTC4089EDJC-1#PBF datasheet, LTC4089EDJC-1#PBF pinout, LTC4089EDJC-1#PBF application, or LTC4089EDJC-1#PBF equivalent, key selection criteria include its dual-input PowerPath™ architecture, 215mΩ internal ideal diode, 4.1V ±0.8% float voltage accuracy, thermal regulation down to 105°C junction, and compatibility with external PFET ideal diode control.

Technical Context

The LTC4089EDJC-1#PBF integrates three independent power paths: USB (IN→OUT), high-voltage buck (HVIN→HVOUT→BAT/OUT), and battery-to-load ideal diode (BAT→OUT). Its current-mode 750kHz HV buck regulator uses an internal 1.95A bipolar switch and BOOST-driven gate drive to sustain >1.2A charge current across 6V–36V HVIN.

Charge management employs constant-current/constant-voltage (CC/CV) regulation with programmable ICHG (via PROG), kEOC = 0.1 C/10 termination, VRECHRG = 100mV hysteresis, and TIMER-based total charge timeout. Input current limiting is dynamically shared between load and charge via CLPROG/HPWR-controlled ICL (500mA/100mA), ensuring strict USB compliance.

Key Specifications

Pinout & Package

Package: 22-pin DFN (6mm × 3mm × 0.75mm), exposed pad (Pin 23) required to be soldered to PCB ground 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#PBF uniquely combines 6V–36V HVIN compatibility, JEITA-compliant NTC monitoring, and dual-mode ideal diode (internal + external PFET) - making it irreplaceable in multi-source industrial and automotive USB devices.

Availability

LTC4089EDJC-1#PBF is available at Aetrix Electronics and suitable for portable GPS receivers, digital cameras, USB-powered audio players, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC4089EDJC-1#PBF 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 with precision, reliability, and innovation.

The LTC4089EDJC-1#PBF belongs to Linear's PowerPath™ family, engineered specifically for seamless multi-source power arbitration and safe, efficient Li-Ion charging in space-constrained portable electronics.

FAQ

What is the maximum charge current supported by the LTC4089EDJC-1#PBF?

The LTC4089EDJC-1#PBF supports a maximum programmable charge current of 1.2A, achieved when RPROG = 42kΩ and thermal conditions permit. The device implements thermal foldback above 105°C junction temperature to maintain safe operation, and charge current is automatically reduced if input current limits (set via CLPROG/HPWR) or load demand constrain total power delivery. The LTC4089EDJC-1#PBF datasheet specifies ICHG(MAX) = 1.2A under defined test conditions.

Does the LTC4089EDJC-1#PBF require an external PFET to function?

No, the LTC4089EDJC-1#PBF operates fully functional with its internal 215mΩ ideal diode (BAT→OUT) and does not require an external PFET. The GATE pin (Pin 10) is optional and provided to drive an external P-channel MOSFET for lower conduction loss in high-current or low-dropout applications. When unused, GATE must be left floating. The LTC4089EDJC-1#PBF delivers full PowerPath™ functionality-including battery backup, USB/HVIN arbitration, and charging-without any external FET.

How does the LTC4089EDJC-1#PBF handle simultaneous USB and HVIN input presence?

The LTC4089EDJC-1#PBF implements strict priority-based arbitration: HVIN (Pin 21) has highest priority, followed by IN (USB VBUS), then BAT. When both HVIN and IN are valid, the device disconnects the IN→OUT path and routes power exclusively through the HVIN→HVOUT→OUT path while simultaneously charging the battery. This behavior is hardware-defined and requires no configuration. The HVPR pin (Pin 7) asserts low to signal HVIN presence, confirming the active high-voltage path. The LTC4089EDJC-1#PBF ensures zero cross-conduction between inputs.

What is the purpose of the TIMER pin on the LTC4089EDJC-1#PBF?

The TIMER pin (Pin 17) accepts an external capacitor to set total charge timeout duration using the formula tTIMER(hours) = CTIMER × RPROG × 3 / (0.1µF × 100kΩ). For example, with RPROG = 100kΩ and CTIMER = 100nF, total charge time is ~3 hours. Charging halts if the battery does not reach full charge (C/10 detection) before timeout. Shorting TIMER to GND disables all charging functions. The LTC4089EDJC-1#PBF uses this timer for safety-critical end-of-charge enforcement independent of voltage or temperature conditions.

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

No - the LTC4089EDJC-1#PBF does not support concurrent charging and discharging from the BAT pin. During charging, BAT is a sink (current flows into the battery). When external inputs are absent, BAT acts as a source (current flows out to OUT via the ideal diode). The device prevents reverse current flow during charge mode; attempting to draw load current from BAT while charging would violate its internal power-path architecture. Load power must be supplied from OUT, which draws from HVIN, IN, or BAT - but never directly from BAT during charge. The LTC4089EDJC-1#PBF enforces this separation strictly in hardware.