Analog Devices Inc. LTC4075EDD#PBF

Overview

LTC4075EDD#PBF from Analog Devices (formerly Linear Technology) is a standalone dual-input 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 thermal regulation at 105°C, and programmable charge termination via external resistor. It is used in portable consumer electronics requiring compact, source-agnostic battery charging.

For engineers reviewing the LTC4075EDD#PBF datasheet, LTC4075EDD#PBF pinout, LTC4075EDD#PBF application, or LTC4075EDD#PBF equivalent, key selection criteria include dual-input automatic source selection, independent current programming for DCIN/USBIN, thermal-foldback behavior, shutdown current specs (20µA DCIN / 10–18µA USBIN), and absence of external sense resistor or blocking diode requirements.

Technical Context

The LTC4075EDD#PBF implements a constant-current/constant-voltage (CC/CV) charging algorithm with two independent P-channel MOSFETs-one for DCIN-to-BAT and one for USBIN-to-BAT-enabling seamless input arbitration. Its internal thermal feedback loop dynamically reduces charge current when die temperature approaches 105°C, eliminating need for external thermal design margins.

Power source selection logic prioritizes DCIN if VDCIN > 4.15V and VDCIN > VBAT + 180mV (rising), otherwise defaults to USBIN if VUSBIN > 3.95V and VUSBIN > VBAT + 140mV (rising); status outputs (⎯P⎯W⎯R, USBPWR, ⎯C⎯H⎯R⎯G) provide open-drain indication of source selection and charge state without external pull-ups.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) DFN with exposed pad (Pin 11), 0.75mm profile, thermally enhanced; exposed pad must be soldered to PCB ground for electrical continuity and thermal performance (θJA = 40°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65217CIRSLR and BQ24075RGTR, the LTC4075EDD#PBF offers true plug-and-play dual-input autonomy without firmware, external FETs, or additional ICs-making it optimal for cost-sensitive, space-constrained, and firmware-light portable devices where simplicity and reliability are critical.

Availability

LTC4075EDD#PBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless headsets, handheld barcode scanners, smart remote controls, and digital audio players requiring stable component supply and long-term production continuity.

Supply support for LTC4075EDD#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and connectivity.

The LTC4075EDD#PBF belongs to ADI's Linear Technology legacy battery management portfolio, designed specifically for compact, dual-source–aware Li-Ion charging in resource-constrained portable electronics where minimal external components and autonomous operation are essential.

FAQ

What is the maximum charge current the LTC4075EDD#PBF can deliver from a wall adapter input?

The LTC4075EDD#PBF delivers up to 800mA from the DCIN input when configured with RIDC = 1.24kΩ. This value is confirmed in the Electrical Characteristics table (IBAT = 760–840mA, typical 800mA) and supported by Figure 2 in the datasheet showing an 800mA wall adapter configuration. The device achieves this without external sense resistors or MOSFETs due to its integrated power stage.

Does the LTC4075EDD#PBF support automatic recharge, and at what battery voltage does it trigger?

Yes, the LTC4075EDD#PBF supports automatic recharge. It triggers a new charge cycle when the battery voltage falls below 4.1V (ΔVRECHRG = 100mV below VFLOAT), as specified in the Electrical Characteristics table and confirmed in the Applications Information section. This threshold is temperature-compensated and filtered with a 6ms comparator delay (tRECHRG) to prevent oscillation.

How does the LTC4075EDD#PBF handle simultaneous presence of DCIN and USBIN power sources?

The LTC4075EDD#PBF automatically selects DCIN when VDCIN > 4.15V and VDCIN > VBAT + 180mV (rising edge); otherwise, it selects USBIN if VUSBIN > 3.95V and VUSBIN > VBAT + 140mV. This behavior is defined in Table 1 and the Power Source Selection section. Status outputs ⎯P⎯W⎯R and USBPWR reflect the selected source in real time.

What is the purpose of the ITERM pin on the LTC4075EDD#PBF, and how is it used?

The ITERM pin on the LTC4075EDD#PBF programs the charge termination current threshold using RITERM = 100mV / ITERM (e.g., 1kΩ → 100mA). When the battery current drops below this threshold during constant-voltage mode, the charger terminates and enters standby. The pin is internally clamped to ~1.5V, and driving it above 100mV prevents termination-per Note 6 in the datasheet.

Is the LTC4075EDD#PBF compatible with lithium-polymer batteries?

Yes, the LTC4075EDD#PBF is compatible with single-cell Li-Po batteries because its fixed 4.2V float voltage matches the standard full-charge voltage for both Li-Ion and Li-Po chemistries. The datasheet explicitly states "Charges Single-Cell Li-Ion Batteries" but does not exclude Li-Po; application circuits and voltage tolerances (±0.6%) align with common Li-Po specifications.