Analog Devices Inc. LTC4058EDD-4.2#TRPBF

Overview

LTC4058EDD-4.2#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion battery charger IC with Kelvin sensing, thermal regulation, and USB-compatible input (4.25V–6.5V). It delivers up to 950mA charge current, maintains ±1% 4.2V float voltage accuracy, and integrates an internal P-channel MOSFET-requiring no external sense resistor, blocking diode, or MOSFET. It is used in compact portable devices such as Bluetooth headsets and MP3 players where space-constrained, thermally robust charging is critical.

For engineers reviewing the LTC4058EDD-4.2#TRPBF datasheet, LTC4058EDD-4.2#TRPBF pinout, LTC4058EDD-4.2#TRPBF application, or LTC4058EDD-4.2#TRPBF equivalent, key selection considerations include its DFN-8 (3mm × 3mm) thermal pad package, C/10 termination with 1ms filter, 2.9V trickle-charge threshold, automatic recharge at ~4.1V, and charge-current monitor output for gas gauging.

Technical Context

The LTC4058EDD-4.2#TRPBF implements a constant-current/constant-voltage (CC/CV) charging algorithm with integrated thermal feedback that reduces charge current when die temperature approaches ~120°C. Its Kelvin-sense architecture (BSENSE pin tied directly to battery anode) eliminates trace IR drop error in high-current paths.

It features dual open-drain status outputs: CHRG (active-low during charge) and ACPR (active-low when VCC > UVLO and ≥100mV above BSENSE), plus EN pin control for manual shutdown (<2µA battery drain). Charge current is set by a single 1% resistor on PROG, with real-time monitoring via V_PROG = I_BAT × R_PROG/1000.

Key Specifications

Pinout & Package

Package: 8-lead DFN (3mm × 3mm × 0.75mm) with exposed thermal pad (Pin 9 = GND), requiring soldering to PCB ground plane for θ_JA ≈ 40°C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4054ES5-4.2#TRMPBF, the LTC4058EDD-4.2#TRPBF provides superior voltage accuracy via Kelvin sensing and higher thermal headroom; versus LTC4053EDD-4.2#TRPBF, it offers simpler integration (no USB data or thermistor routing) but lacks advanced safety features and higher current capability.

Availability

LTC4058EDD-4.2#TRPBF is available at Aetrix Electronics and suitable for wireless audio accessories, portable medical wearables, smart remotes, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for LTC4058EDD-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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The LTC4058EDD-4.2#TRPBF belongs to Linear's precision battery management IC family, designed specifically for space-constrained, thermally demanding single-cell Li-ion charging in portable consumer and industrial electronics.

FAQ

What is the maximum charge current supported by the LTC4058EDD-4.2#TRPBF?

The LTC4058EDD-4.2#TRPBF supports up to 950mA charge current under optimal thermal conditions - achieved with a low-thermal-resistance PCB layout (exposed pad soldered to ≥2500mm² copper) and ambient temperature ≤52°C at 5V input and 3.3V battery. The actual current is set by R_PROG and automatically reduced by thermal regulation above ~120°C junction temperature.

Does the LTC4058EDD-4.2#TRPBF require an external MOSFET or sense resistor?

No, the LTC4058EDD-4.2#TRPBF integrates a P-channel power MOSFET and precision voltage reference, eliminating the need for external pass transistors, current-sense resistors, or blocking diodes. Only two external components are required: a 1% programming resistor (R_PROG) from PROG to GND and a minimum 1µF input bypass capacitor on VCC.

How does Kelvin sensing improve charging accuracy in the LTC4058EDD-4.2#TRPBF?

Kelvin sensing in the LTC4058EDD-4.2#TRPBF uses the dedicated BSENSE pin connected directly to the battery anode, separate from the high-current BAT pin path. This removes voltage drop errors caused by PCB trace resistance during high-current charging, ensuring the regulated 4.2V ±1% float voltage is applied precisely at the cell terminals - critical for longevity and capacity retention.

What happens when input power is removed from the LTC4058EDD-4.2#TRPBF?

When VCC is removed or falls below the undervoltage lockout threshold (~3.8V) or within 100mV of BSENSE, the LTC4058EDD-4.2#TRPBF enters ultra-low-power shutdown mode, reducing battery drain current to <2µA. The CHRG and ACPR pins go high-impedance, and the internal MOSFET disconnects the input from the battery - preserving battery charge during storage or disconnection.

Can the LTC4058EDD-4.2#TRPBF be used with USB Type-A ports?

Yes, the LTC4058EDD-4.2#TRPBF is explicitly designed for USB compatibility: its 4.25V–6.5V input range accepts standard 5V USB power, and its current-limiting architecture meets USB 2.0 port specifications. When paired with appropriate input protection (e.g., reverse-polarity MOSFET or diode), it safely charges from host PCs, wall adapters, or powered hubs without violating USB voltage or inrush constraints.