Analog Devices Inc. LTC4058XEDD-4.2#PBF

Overview

LTC4058XEDD-4.2#PBF 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#PBF datasheet, LTC4058XEDD-4.2#PBF pinout, LTC4058XEDD-4.2#PBF application, or LTC4058XEDD-4.2#PBF equivalent, this page provides verified technical context, thermal regulation behavior, C/10 termination logic, Kelvin-sense implementation, and validated alternative parts for Li-ion charging designs requiring low external component count and USB compliance.

Technical Context

The LTC4058XEDD-4.2#PBF implements a constant-current/constant-voltage (CC/CV) charge algorithm with internal P-channel MOSFET (R_DS(ON) = 600mΩ), fixed 4.2V float voltage, and C/10 termination. Its thermal regulation loop activates at ~120°C junction temperature to reduce charge current dynamically without external intervention.

Unlike the LTC4058-4.2, the "X" variant omits trickle charge functionality (no 2.9V threshold or 1/10th current mode), simplifying operation for batteries pre-conditioned above 2.9V. Battery voltage is sensed via dedicated BSENSE pin for Kelvin connection, eliminating trace IR drop error in high-current PCB layouts.

Key Specifications

Pinout & Package

8-lead plastic DFN (3mm × 3mm), exposed pad (Pin 9) is GND and must be soldered to PCB for thermal performance. Package outline conforms to 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 LTC4058XEDD-4.2#PBF, LTC4054EDD-4.2#PBF adds trickle charge but removes EN control and reduces current capability, while LTC4053EDD-4.2#PBF increases current and USB features at the cost of thermal regulation - making LTC4058XEDD-4.2#PBF optimal for thermally demanding, enable-controlled, high-accuracy USB-charged devices.

Availability

LTC4058XEDD-4.2#PBF is available at Aetrix Electronics and suitable for wireless headsets, portable medical sensors, smart remote controls, and industrial handheld scanners requiring stable component supply and guaranteed long-term sourcing.

Supply support for LTC4058XEDD-4.2#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 semiconductors.

The LTC4058X series was designed specifically for space-constrained, USB-powered portable electronics requiring accurate, thermally robust, single-cell Li-ion charging with minimal external components.

FAQ

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

The LTC4058XEDD-4.2#PBF omits the trickle charge feature present in the LTC4058EDD-4.2#PBF. Specifically, LTC4058XEDD-4.2#PBF does not activate low-current charging below 2.9V battery voltage, whereas the standard LTC4058EDD-4.2#PBF enters trickle mode at that threshold. This makes the "X" variant appropriate for applications where batteries remain above 2.9V between uses, simplifying charge control and eliminating unnecessary low-current stages.

How does the Kelvin sensing on LTC4058XEDD-4.2#PBF improve charging accuracy?

The LTC4058XEDD-4.2#PBF uses separate BSENSE and BAT pins to implement true Kelvin sensing: BSENSE connects directly to the battery anode, while BAT drives current through the PCB trace. This eliminates voltage drop errors caused by trace resistance during high-current charging, enabling the ±1% float voltage accuracy specified in the datasheet - critical for maximizing Li-ion cycle life and capacity retention.

What thermal performance can be expected from LTC4058XEDD-4.2#PBF on a standard PCB?

With the exposed thermal pad (Pin 9) properly soldered to a 2500mm² double-sided 1oz copper ground plane, the LTC4058XEDD-4.2#PBF achieves θ_JA ≈ 40°C/W. Under these conditions, it sustains 800mA charge current from a 5V supply into a 3.3V battery up to ~52°C ambient before thermal regulation reduces current - significantly higher than non-thermally regulated alternatives.

Can LTC4058XEDD-4.2#PBF be used with a 3.3V input supply?

No. The LTC4058XEDD-4.2#PBF requires a minimum input supply voltage of 4.25V per its absolute maximum ratings and operational specifications. A 3.3V source falls below the UVLO threshold (3.8V typical) and cannot power the internal circuitry or charge the battery. It is designed exclusively for 5V USB or 5–6V wall adapter inputs.

What is the purpose of the EN pin on LTC4058XEDD-4.2#PBF, and how should it be configured?

The EN pin on LTC4058XEDD-4.2#PBF enables hardware-controlled shutdown: driving it high reduces battery drain to <2µA and supply current to <50µA. It features an internal 2MΩ pull-down resistor, so leaving it unconnected defaults to enabled operation. For systems requiring active charge control, connect EN to a GPIO or power sequencer output to gate charging independently of input voltage presence.