Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Analog Devices Inc. LTC4085EDE-4#TRPBF

Name: LTC4085EDE-4#TRPBF
Brand: Analog Devices Inc.
SKU: LTC4085EDE-4#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LTC4085EDE-4#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Battery Chargers

Package:: 14-WFDFN Exposed Pad

Datasheet:: LTC4085EDE-4#TRPBF.pdf

Description:: IC BATT CHG LI-ION 1CELL 14DFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,411

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LTC4085EDE-4#TRPBF from Analog Devices (formerly Linear Technology) is a USB power manager and linear Li-ion battery charger with integrated ideal diode controller. It delivers 3.95V float voltage, supports up to 1.2A programmable charge current, enforces 500mA/100mA input current limits via HPWR pin control, and operates in –40°C to +85°C for portable USB-powered devices requiring extended battery life at elevated temperatures.

For engineers reviewing the LTC4085EDE-4#TRPBF datasheet, LTC4085EDE-4#TRPBF pinout, LTC4085EDE-4#TRPBF application, or LTC4085EDE-4#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal regulation behavior, and real-world PowerPath™ transition timing - all specific to the LTC4085EDE-4#TRPBF variant with no undervoltage current limit function.

Technical Context

The LTC4085EDE-4#TRPBF implements a dual-path PowerPath™ architecture: one path regulates USB/wall adapter input current (programmable via CLPROG resistor and HPWR logic), while the other manages constant-current/constant-voltage charging of single-cell Li-ion batteries at 3.95V. Its internal 215mΩ ideal diode enables seamless BAT-to-OUT power delivery when input sources are absent or overloaded.

Unlike the LTC4085-3 variant, the LTC4085EDE-4#TRPBF omits automatic output undervoltage charge current reduction - confirmed by the "No" entry under "UNDERVOLTAGE CURRENT LIMIT*" in the Options table. It retains full NTC thermistor monitoring, TIMER-based termination, and CHRG status output, with thermal regulation active above 105°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Float Voltage	3.95V ±35mV - optimized for high-temperature battery longevity and reduced swelling in polymer cells
Max Charge Current	1.2A - set independently via PROG resistor; limited to ≤1.5A absolute max per datasheet
Input Current Limit	Selectable 500mA (HPWR = high) or 100mA (HPWR = low) - enforced via CLPROG resistor and internal current sense
Ideal Diode R_ON	215mΩ - enables low-loss BAT-to-OUT power transfer during USB disconnect or overload
Operating Temp Range	–40°C to +85°C - fully specified across range; junction temp limited to 110°C max
Package	14-lead (4mm × 3mm) DFN with exposed GND pad - requires PCB thermal pad connection for rated performance
NTC Monitoring	Supports hot/cold fault detection using VNTC bias and 32.6% V_VNTC thresholds - identical to LTC4085-3

Pinout & Package

Package: 14-lead plastic DFN (4mm × 3mm × 0.75mm), lead-free, exposed pad (Pin 15) connected to GND. Requires soldering exposed pad to PCB for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
IN (1)	USB VBUS Input	Accepts 4.35–5.5V; current-limited input path with soft-start and UVLO (3.6V rising)
OUT (2)	System Power Output	Delivers regulated power to load from IN or BAT; bypassed with ≥4.7μF capacitor
CLPROG (3)	Input Current Limit Programming	Resistor-to-GND sets I_IN limit (e.g., 2kΩ = 500mA); also provides real-time I_IN monitor voltage
HPWR (4)	High Power Mode Select	Logic input: >1.2V enables 100% I_IN limit; <0.4V enables 20% limit; 2μA internal pull-down
SUSP (5)	USB Suspend Control	Pull >1.2V to reduce I_IN to ≤110μA; preserves BAT-to-OUT ideal diode and charging capability
TIMER (6)	Charge Timer Capacitor	Capacitor-to-GND sets timer period (t_TIMER = C_TIMER × R_PROG × 3h / 0.1μF × 100kΩ)
WALL (7)	Wall Adapter Detection	Rising threshold 4.25V; disconnects IN-to-OUT path and asserts ACPR low when wall adapter present
NTC (8)	Thermistor Input	Connects to NTC thermistor; enables hot/cold fault shutdown with 32.6% V_VNTC threshold
VNTC (9)	NTC Bias Reference	4.4–4.85V precision bias source for NTC divider network
ACPR (10)	Wall Adapter Present Output	Open-drain active-low signal indicating WALL pin threshold exceeded
CHRG (11)	Charge Status Indicator	Open-drain output pulled low during charging; high-impedance at EOC or suspend
PROG (12)	Battery Charge Current Set	Resistor-to-GND programs I_BAT (e.g., 100kΩ = 500mA); V_PROG = 1.0V ±2%
GATE (13)	External PFET Gate Driver	Drives gate of external P-channel MOSFET to reduce ideal diode impedance; leave floating if unused
BAT (14)	Battery Connection	Connects to single-cell Li-ion/polymer anode; carries charge current and supplies OUT via ideal diode
GND (15)	Power & Signal Ground	Exposed pad must be soldered to PCB ground plane for thermal management and functional integrity

Key Features

Feature	Design Value
3.95V Float Voltage	Extends cycle life >20% at 60°C vs. 4.2V variants by reducing electrolyte decomposition and cell swelling
Load-Dependent Charging	Automatically reduces I_BAT so I_IN = I_OUT + I_BAT never exceeds programmed limit - ensures USB compliance
Internal 215mΩ Ideal Diode	Enables sub-55mV forward drop at 600mA, eliminating Schottky losses and enabling seamless IN/BAT transitions
Programmable Termination Timer	Configurable via external capacitor to prevent overcharge; accuracy ±10% over temperature
NTC Thermistor Interface	Integrated comparator with 32.6% V_VNTC hot threshold and hysteresis - supports industry-standard battery packs

Applications

USB-Powered Portable Medical Monitor	Industrial Handheld Scanner
Use Scenario: Battery-backed device operating continuously on USB bus power, with periodic wall adapter charging during maintenance windows. IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF manages dual-input power routing, enforces 500mA USB current limit, and charges battery at 3.95V to preserve capacity during 55°C warehouse storage. Use Value: Prevents USB host port overload while extending battery service life beyond 500 cycles at elevated ambient temperature.	Use Scenario: Ruggedized barcode scanner used in logistics with intermittent USB tethering and frequent wall adapter top-ups. IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF provides seamless switchover between USB and wall adapter, disables charging during suspend, and monitors battery temperature during fast charging. Use Value: Eliminates manual power selection; maintains runtime >8 hours per charge despite 60°C operational environment.
Smart Wearable Health Tracker	USB-C Powered Bluetooth Audio Dongle
Use Scenario: Compact wearable with micro-LiPo battery, charged exclusively via USB while worn, requiring minimal thermal rise during charging. IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF delivers precise 3.95V float voltage and thermal regulation at 105°C to avoid skin-contact temperature hazards. Use Value: Achieves <1.5°C case temperature rise during 500mA charging - critical for user comfort and safety certification.	Use Scenario: Low-power audio accessory drawing <100mA from USB-C port, with battery backup for cable disconnection events. IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF acts as USB current limiter and ideal diode controller, enabling instant failover to battery without audio dropout. Use Value: Delivers <5μs switchover time from USB removal to BAT power, preventing audible pop/click in analog audio path.

USB-Powered Portable Medical Monitor

Industrial Handheld Scanner

Use Scenario: Battery-backed device operating continuously on USB bus power, with periodic wall adapter charging during maintenance windows.

IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF manages dual-input power routing, enforces 500mA USB current limit, and charges battery at 3.95V to preserve capacity during 55°C warehouse storage.

Use Value: Prevents USB host port overload while extending battery service life beyond 500 cycles at elevated ambient temperature.

Use Scenario: Ruggedized barcode scanner used in logistics with intermittent USB tethering and frequent wall adapter top-ups.

IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF provides seamless switchover between USB and wall adapter, disables charging during suspend, and monitors battery temperature during fast charging.

Use Value: Eliminates manual power selection; maintains runtime >8 hours per charge despite 60°C operational environment.

Smart Wearable Health Tracker

USB-C Powered Bluetooth Audio Dongle

Use Scenario: Compact wearable with micro-LiPo battery, charged exclusively via USB while worn, requiring minimal thermal rise during charging.

IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF delivers precise 3.95V float voltage and thermal regulation at 105°C to avoid skin-contact temperature hazards.

Use Value: Achieves <1.5°C case temperature rise during 500mA charging - critical for user comfort and safety certification.

Use Scenario: Low-power audio accessory drawing <100mA from USB-C port, with battery backup for cable disconnection events.

IC Role / Device Role / Timing Role: LTC4085EDE-4#TRPBF acts as USB current limiter and ideal diode controller, enabling instant failover to battery without audio dropout.

Use Value: Delivers <5μs switchover time from USB removal to BAT power, preventing audible pop/click in analog audio path.

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB power management and Li-ion charging applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC4085EDE-3#TRPBF	Includes automatic output undervoltage current limit (reduces I_BAT when V_OUT < ~4.45V); otherwise identical pinout, specs, and 3.95V float	Required where system load causes V_OUT droop during high-current USB operation	Select LTC4085EDE-3#TRPBF only if V_OUT stability under dynamic load is critical; LTC4085EDE-4#TRPBF is preferred for simpler designs
BQ24075RGTR	4.2V float voltage; no ideal diode controller; lacks WALL/ACPR pins and NTC interface; uses different PROG scaling (1000V/R_PROG)	Targeted at cost-sensitive consumer electronics without thermal monitoring or wall adapter detection	Choose BQ24075RGTR only for non-temperature-critical, single-source USB applications; not drop-in compatible

Compared with LTC4085EDE-3#TRPBF, the LTC4085EDE-4#TRPBF removes undervoltage current limiting but retains identical thermal safety, PowerPath™ control, and 3.95V battery longevity benefits; versus BQ24075RGTR, it offers superior system-level integration with ideal diode, wall adapter sensing, and NTC support - at higher BOM count but greater reliability in industrial environments.

Availability

LTC4085EDE-4#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, smart wearables, and USB-C audio accessories requiring stable component supply, long-term battery health, and seamless dual-input power management.

Supply support for LTC4085EDE-4#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 LTC parts.

The LTC4085 family was designed specifically for USB-powered portable systems needing intelligent PowerPath™ control, battery longevity optimization at temperature extremes, and robust thermal management - with the LTC4085EDE-4#TRPBF targeting applications where undervoltage current limiting is unnecessary.

FAQ

What is the key functional difference between LTC4085EDE-4#TRPBF and LTC4085EDE-3#TRPBF?

The LTC4085EDE-4#TRPBF omits the automatic output undervoltage current limit feature present in the LTC4085EDE-3#TRPBF. When V_OUT falls below ~4.45V, the LTC4085EDE-3#TRPBF reduces charge current to maintain output regulation; the LTC4085EDE-4#TRPBF does not perform this reduction. All other specifications - including 3.95V float voltage, NTC interface, TIMER accuracy, and PowerPath™ control - are identical between the two variants.

Does LTC4085EDE-4#TRPBF support wall adapter input, and how is it detected?

Yes, LTC4085EDE-4#TRPBF supports wall adapter input detection via the WALL pin (Pin 7). A voltage exceeding 4.25V (rising threshold) on this pin disconnects the IN-to-OUT power path and pulls the ACPR pin low to signal wall adapter presence. This prevents backfeed into the USB port and allows the device to prioritize wall adapter power while continuing to charge the battery - all without external components.

What is the maximum battery charge current achievable with LTC4085EDE-4#TRPBF, and how is it set?

The LTC4085EDE-4#TRPBF supports up to 1.2A battery charge current, set by connecting a resistor (R_PROG) from PROG (Pin 12) to GND. The relationship is I_CHG = 50,000V / R_PROG. For example, a 100kΩ resistor yields 500mA (50,000 / 100,000 = 0.5A), while a 47kΩ resistor yields ~1.06A. The absolute maximum charge current is 1.5A, beyond which accuracy degrades per datasheet Note 8.

How does the ideal diode function operate in LTC4085EDE-4#TRPBF during USB disconnect?

When USB power (IN) is removed, the LTC4085EDE-4#TRPBF's internal ideal diode automatically connects BAT to OUT within microseconds. This occurs when V_BAT exceeds V_OUT by ~20mV, turning on the internal P-MOSFET. With the recommended 4.7μF output capacitor, V_OUT droop remains <100mV during switchover - ensuring uninterrupted operation of downstream LDOs, regulators, or digital loads connected to the OUT pin.

Is thermal regulation active in LTC4085EDE-4#TRPBF, and at what junction temperature does it engage?

Yes, thermal regulation is fully active in LTC4085EDE-4#TRPBF. When the die junction temperature reaches 105°C, the device enters constant-temperature mode and reduces charge current to maintain that temperature. This protects both the IC and the battery during high-ambient or high-power-charging conditions. The maximum allowable junction temperature is 110°C, with overtemperature protection triggering above that threshold.

LTC4085EDE-4#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: PowerPath™

Package/Case:: 14-WFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1

Current - Charging:: Constant - Programmable

Programmable Features:: -

Fault Protection:: -

Charge Current - Max:: 1.5A

Battery Pack Voltage:: 3.95V

Voltage - Supply (Max):: 5.5V

Interface:: USB

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-DFN (4x3)

LTC4085EDE-4#TRPBF FAQ

1.How can I place an order for LTC4085EDE-4#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC4085EDE-4#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LTC4085EDE-4#TRPBF reliable?

The price and inventory of LTC4085EDE-4#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4085EDE-4#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC4085EDE-4#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4085EDE-4#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC4085EDE-4#TRPBF?

LTC4085EDE-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC4085EDE-4#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LTC4085EDE-4#TRPBF?

For technical support, including LTC4085EDE-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4085EDE-4#TRPBF requirements.

6.How does Aetrix verify that LTC4085EDE-4#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC4085EDE-4#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC4085EDE-4#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC4085EDE-4#TRPBF?

All LTC4085EDE-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4085EDE-4#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LTC4085EDE-4#TRPBF part is unused and in its original packaging.

Return procedure for LTC4085EDE-4#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…