Analog Devices Inc. LTC4076EDD#PBF

Overview

LTC4076EDD#PBF 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 to charge a single-cell 4.2V battery. It delivers up to 800mA from DCIN and 500mA from USBIN, features ±0.6% float voltage accuracy, internal MOSFETs eliminating external sense resistors or blocking diodes, and thermal regulation limiting die temperature to 105°C - used in portable medical monitors requiring reliable, low-component-count charging.

For engineers reviewing the LTC4076EDD#PBF datasheet, LTC4076EDD#PBF pinout, LTC4076EDD#PBF application, or LTC4076EDD#PBF equivalent, key selection criteria include dual-input automatic source selection, programmable termination threshold via ITERM resistor, HPWR-controlled USB current scaling (100%/20%), thermal foldback behavior, and 10-lead DFN package thermal performance with exposed pad grounding.

Technical Context

The LTC4076EDD#PBF implements a constant-current/constant-voltage (CC/CV) charge algorithm with two independent current programming paths: IDC pin (for DCIN, servoing to 1.0V) and IUSB pin (for USBIN, also servoing to 1.0V), each supporting resistor-based current setting up to 950mA and 650mA respectively. Internal P-channel MOSFETs with R_ON-DC = 400mΩ and R_ON-USB = 550mΩ enable direct battery connection without external diodes.

Thermal regulation activates at ~105°C junction temperature, dynamically reducing charge current to maintain safe die temperature; undervoltage lockout thresholds are 4.15V (DCIN) and 3.95V (USBIN) with hysteresis, and automatic recharge triggers at V_BAT ≤ 4.1V after full-charge termination.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) DFN with exposed thermal pad (Pin 11 = GND), 0.75mm profile, RoHS-compliant.

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 MAX1555ETA+, the LTC4076EDD#PBF uniquely integrates dual-input selection, programmable termination, HPWR-based USB scaling, and self-regulating thermal foldback - delivering higher design autonomy and reduced external component count in space-constrained, thermally demanding applications.

Availability

LTC4076EDD#PBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, wearable health trackers, emergency communication radios, and ruggedized IoT edge devices requiring stable component supply with guaranteed long-term availability.

Supply support for LTC4076EDD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC4076EDD#PBF belongs to ADI's Linear Technology legacy battery management portfolio, designed specifically for compact, dual-input Li-Ion charging in resource-constrained portable electronics where reliability, thermal resilience, and minimal external components are critical.

FAQ

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

The LTC4076EDD#PBF delivers up to 800mA from the DCIN input when configured with RIDC = 1.24kΩ (±1%). This assumes VDCIN ≥ 4.3V and thermal conditions permitting - the internal thermal regulation reduces current if junction temperature approaches 105°C. The LTC4076EDD#PBF datasheet specifies 950mA as absolute maximum under ideal conditions, but 800mA is the validated typical value for robust operation.

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

The LTC4076EDD#PBF automatically selects DCIN when both inputs are present and DCIN meets its UVLO threshold (≥4.15V) and exceeds battery voltage by ≥180mV. If DCIN falls below these criteria, it switches to USBIN. The open-drain PWR output reflects the active source. This behavior is hardwired - no configuration registers or firmware required - making the LTC4076EDD#PBF truly standalone.

Can the LTC4076EDD#PBF be used without connecting the exposed thermal pad?

No. The exposed pad (Pin 11) is electrically GND and thermally critical: failure to solder it to a ≥2500mm² copper pour results in θJA > 40°C/W, causing premature thermal foldback and unreliable full-current operation. The LTC4076EDD#PBF datasheet explicitly states that unsoldered pad operation violates Absolute Maximum Ratings and voids performance guarantees.

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

The HPWR pin on the LTC4076EDD#PBF controls USB charge current scaling: logic HIGH enables 100% of the current set by RIUSB, while logic LOW reduces it to 20%. This allows compliance with USB 2.0 suspend (100mA) and high-power (500mA) modes without changing hardware. The LTC4076EDD#PBF includes a 2MΩ internal pulldown, defaulting to low-power mode if left unconnected.

Does the LTC4076EDD#PBF support automatic recharge, and what triggers it?

Yes. The LTC4076EDD#PBF automatically restarts charging when battery voltage drops to 4.1V (ΔV = 100mV below 4.2V float), with a 6ms filter time to reject noise. This occurs in standby mode after full-charge termination and ensures the battery remains near full capacity without external supervision - a core feature confirmed in the LTC4076EDD#PBF functional block diagram and state machine.