Analog Devices Inc. LTC4076EDD#TRPBF

Overview

LTC4076EDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-input standalone linear Li-Ion battery charger IC that autonomously selects between wall adapter (DCIN) and USB (USBIN) power sources. It delivers up to 800 mA from DCIN and 500 mA from USBIN, regulates float voltage at 4.2 V ±0.6%, uses internal MOSFETs (no external sense resistor or blocking diode), and features thermal regulation at 105°C for safe high-power operation in portable electronics.

For engineers reviewing the LTC4076EDD#TRPBF datasheet, LTC4076EDD#TRPBF pinout, LTC4076EDD#TRPBF application, or LTC4076EDD#TRPBF equivalent, key selection criteria include dual-input automatic source selection, programmable charge current via IDC/IUSB resistors, ITERM-based termination threshold, HPWR-controlled USB current scaling (100% or 20%), and thermal feedback limiting without external components.

Technical Context

The LTC4076EDD#TRPBF implements a constant-current/constant-voltage (CC/CV) charging algorithm with two independent internal P-channel MOSFETs-one for DCIN-to-BAT (RON = 400 mΩ), one for USBIN-to-BAT (RON = 550 mΩ). Input selection logic prioritizes DCIN when VDCIN > 4.15 V and VDCIN > VBAT + 180 mV (rising); otherwise, it defaults to USBIN if VUSBIN > 3.95 V and VUSBIN > VBAT + 180 mV.

Thermal regulation activates at ~105°C junction temperature, dynamically reducing charge current to maintain die temperature. Charge termination occurs when BAT current falls below user-programmed ITERM threshold (e.g., 100 mA with RITERM = 1 kΩ) after CV mode entry, with 1.5 ms filtering to reject transients. Trickle charge (1/10× full current) engages below 2.9 V BAT, and automatic recharge triggers at ~4.1 V.

Key Specifications

Pinout & Package

Package: 10-lead (3 mm × 3 mm) DFN with exposed thermal pad (Pin 11 = GND), 0.75 mm profile, thermally enhanced for high-current operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-input Li-Ion charging applications.

Compared with BQ24075RGER and MP2617GQZ, the LTC4076EDD#TRPBF uniquely combines true dual-input autonomy, HPWR-controlled USB current scaling, and thermal regulation in a compact 10-pin DFN-making it optimal for space-constrained, USB-compliant portable devices needing zero-software charge management.

Availability

LTC4076EDD#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless headsets, handheld barcode scanners, and smart remote controls requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for LTC4076EDD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC4076EDD#TRPBF belongs to ADI's Linear Power Products line, designed specifically for highly integrated, low-component-count battery charging solutions in space- and power-sensitive portable electronics.

FAQ

What is the maximum charge current the LTC4076EDD#TRPBF can deliver from a wall adapter input?

The LTC4076EDD#TRPBF delivers up to 800 mA from the DCIN input when configured with RIDC = 1.24 kΩ (±1%). Its internal 400 mΩ P-channel MOSFET and thermal regulation allow sustained high-current operation up to ~105°C junction temperature. At higher ambient temperatures, current is automatically reduced to maintain safe die temperature-ensuring reliability without derating design margins manually.

How does the LTC4076EDD#TRPBF handle simultaneous presence of DCIN and USBIN power sources?

The LTC4076EDD#TRPBF prioritizes DCIN over USBIN when both inputs meet validity criteria: VDCIN > 4.15 V and VDCIN > VBAT + 180 mV (rising edge). If DCIN drops below these thresholds, it seamlessly switches to USBIN provided VUSBIN > 3.95 V and VUSBIN > VBAT + 180 mV. The open-drain PWR output reflects active source status, enabling simple LED or microcontroller monitoring.

Can the LTC4076EDD#TRPBF be used to charge a battery while powering a system load?

Yes-the LTC4076EDD#TRPBF supports pass-through operation where the BAT pin supplies both the battery and a parallel system load. During charging, current splits between battery replenishment and load demand. However, if load current exceeds the programmed charge current, the battery discharges. For robust system-power-plus-charge, ensure total load + charge current remains within the IC's thermal limits and FET SOA.

What is the function of the HPWR pin on the LTC4076EDD#TRPBF, and how does it affect USB charging?

The HPWR pin on the LTC4076EDD#TRPBF controls USB charge current scaling: logic HIGH selects 100% of the current set by RIUSB (e.g., 500 mA), while logic LOW selects 20% (e.g., 100 mA). This enables compliance with USB 2.0 standard limits (500 mA max) and USB BC 1.2 enumeration requirements. An internal 2 MΩ pulldown defaults HPWR to LOW, ensuring safe startup without external pull-down.

Does the LTC4076EDD#TRPBF require external components for basic operation, and what are the minimum required parts?

The LTC4076EDD#TRPBF requires only five external components for full functionality: two input bypass capacitors (1 µF each on DCIN and USBIN), one charge current program resistor (RIDC or RIUSB), one termination threshold resistor (RITERM), and the exposed thermal pad soldered to PCB ground. No external sense resistor, blocking diode, or compensation network is needed-enabling minimal BOM and simplified layout.