Analog Devices Inc. LTC4058XEDD-4.2#TRPBF

Overview

LTC4058XEDD-4.2#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion battery charger IC with Kelvin sensing, thermal regulation, and 4.2V ±1% float voltage accuracy. It delivers up to 950mA programmable charge current in a 3mm × 3mm DFN package, requires no external MOSFET, sense resistor, or blocking diode, and is optimized for USB-powered portable devices including Bluetooth headsets and MP3 players.

For engineers reviewing the LTC4058XEDD-4.2#TRPBF datasheet, LTC4058XEDD-4.2#TRPBF pinout, LTC4058XEDD-4.2#TRPBF application, or LTC4058XEDD-4.2#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal regulation behavior, exact C/10 termination implementation, and two rigorously cross-checked alternative parts for single-cell Li-ion charging designs.

Technical Context

The LTC4058XEDD-4.2#TRPBF implements a constant-current/constant-voltage (CC/CV) charge algorithm with internal P-channel MOSFET (R_DS(ON) = 600 mΩ), fixed 4.2V regulation, and thermal feedback limiting at ~120°C. Its Kelvin-sense architecture (BSENSE pin tied directly to battery anode) eliminates trace IR drop error during float voltage regulation.

Unlike the LTC4058-4.2, the "X" variant omits trickle charge functionality-no 2.9V threshold detection or sub-C/10 pre-charge mode-making it suitable for batteries that remain above safe voltage thresholds during storage or system sleep. Charge current is set via a single 1% resistor on PROG, with real-time monitoring enabled by V_PROG = 1V in CC mode and I_BAT = 1000 × V_PROG/R_PROG.

Key Specifications

Pinout & Package

8-lead plastic DFN (3mm × 3mm), exposed pad (Pin 9) is GND and must be soldered to PCB for thermal management (θ_JA = 40°C/W). Package outline per JEDEC MO-229 variation WEED-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar standalone linear Li-ion charging applications.

Compared with LTC4054EDD-4.2#TRPBF and LTC4053EDD-4.2#TRPBF, the LTC4058XEDD-4.2#TRPBF uniquely balances Kelvin-sense precision, zero-trickle-charge safety, and minimal external component count-making it optimal for space-constrained, high-accuracy portable designs where USB data signaling is unnecessary.

Availability

LTC4058XEDD-4.2#TRPBF is available at Aetrix Electronics and suitable for portable audio devices, Bluetooth headsets, medical wearables, and industrial handheld scanners requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to +85°C.

Supply support for LTC4058XEDD-4.2#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 and maintains full product support, documentation, and manufacturing continuity for all Linear-branded precision analog ICs.

The LTC4058X series belongs to Linear's standalone Li-ion charger product line, designed specifically for compact, low-component-count battery charging in USB-powered consumer and portable industrial equipment-emphasizing thermal robustness, voltage accuracy, and integration.

FAQ

What is the key functional difference between LTC4058XEDD-4.2#TRPBF and LTC4058EDD-4.2#TRPBF?

The LTC4058XEDD-4.2#TRPBF omits the 2.9V trickle charge threshold and associated pre-charge mode present in the standard LTC4058EDD-4.2#TRPBF. This makes the "X" variant appropriate for applications where the battery remains above safe voltage during storage or system sleep-reducing unnecessary current injection and simplifying charge-state logic. Both share identical 4.2V ±1% regulation, thermal regulation, and Kelvin sensing.

Does LTC4058XEDD-4.2#TRPBF require an external blocking diode?

No. The LTC4058XEDD-4.2#TRPBF integrates a P-channel MOSFET between VCC and BAT, eliminating the need for an external blocking diode. This reduces power loss, PCB area, and BOM cost. The internal FET also provides reverse-polarity protection on the VCC input when used with appropriate external circuitry (e.g., P-MOSFET or Schottky diode for enhanced robustness).

How is charge current programmed on LTC4058XEDD-4.2#TRPBF, and what is the accuracy?

Charge current is set using a single 1% tolerance resistor (R_PROG) from PROG to GND. The relationship is I_BAT = 1000 × V_PROG/R_PROG, where V_PROG is regulated to 1.0V ±1.5% in constant-current mode. With a 1% R_PROG, total current accuracy is typically ±3%, dominated by resistor tolerance and V_PROG drift over temperature.

What is the purpose of the BSENSE pin on LTC4058XEDD-4.2#TRPBF, and how must it be connected?

The BSENSE pin enables Kelvin sensing of the battery anode, allowing the LTC4058XEDD-4.2#TRPBF to regulate float voltage precisely at the battery terminals-not at the BAT pin-thereby compensating for PCB trace resistance. For all Li-ion applications, BSENSE must be electrically connected directly to the battery anode, separate from the BAT trace if trace resistance is significant (>20mΩ).

Can LTC4058XEDD-4.2#TRPBF operate from a 5V USB port, and what is its maximum supported current?

Yes. The LTC4058XEDD-4.2#TRPBF is explicitly designed for USB power sources, accepting 4.25V to 6.5V input. Its maximum charge current is 950mA-achievable with adequate PCB copper area and thermal management (θ_JA ≤ 40°C/W). At 5V input and 3.3V battery, thermal regulation begins around 52°C ambient, ensuring safe operation without external thermal sensors.