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Analog Devices Inc. LTC4085EDE-1#PBF
- Part No.:
- LTC4085EDE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC4085EDE-1#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:152
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Product details
Overview
LTC4085EDE-1#PBF from Analog Devices (formerly Linear Technology) is a USB power manager and linear Li-ion battery charger with integrated ideal diode control, designed for portable USB-powered devices. It delivers 4.1V float voltage, supports up to 500mA input current limit (100% mode) or 100mA (20% mode), and provides load-dependent charging to maintain USB compliance while powering system loads and charging single-cell batteries. It is used in MP3 players, PDAs, and USB cameras requiring seamless source transition and high-temperature battery safety.
For engineers reviewing the LTC4085EDE-1#PBF datasheet, LTC4085EDE-1#PBF pinout, LTC4085EDE-1#PBF application, or LTC4085EDE-1#PBF equivalent, key selection criteria include its 4.1V fixed float voltage for >60°C operation, programmable input current limit via CLPROG/HPWR, internal 215mΩ ideal diode, NTC thermistor interface, and 14-lead 4mm × 3mm DFN package with exposed thermal pad.
Technical Context
The LTC4085EDE-1#PBF implements a PowerPath™ architecture that dynamically balances input current between system load (OUT) and battery charge (BAT) using two independent resistor-programmed loops: RCLPROG sets input current limit (ICL = 1000V/RCLPROG), while RPROG sets charge current (ICHG = 50,000V/RPROG). Its constant-current/constant-voltage (CC/CV) charger includes C/10 termination, automatic recharging, and thermal regulation at 105°C junction temperature.
It integrates dual-path power routing: an internal 215mΩ ideal diode (VBAT→OUT) activates when VIN is absent or insufficient, and an external PFET gate driver (GATE pin) enables lower-loss conduction. The WALL comparator (4.25V rising threshold) disables IN→OUT path upon wall adapter detection, preventing backfeed into USB while enabling wall-powered battery charging via OUT→BAT path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.1V float voltage with ±0.8% accuracy; optimized for extended capacity retention above 60°C and reduced swelling in prismatic/polymer cells. |
| Input Current Limit | Selectable 100% or 20% of programmed value (e.g., 500mA/100mA via HPWR pin); ensures strict USB 2.0 compliance under all load conditions. |
| Battery Charge Current | Programmable up to 1.2A via RPROG; automatically reduced to prevent IIN exceeding limit - guarantees sum of ILOAD + IBAT ≤ ICL. |
| Ideal Diode RON | 215mΩ internal VBAT→OUT path; enables sub-100mV forward drop at 100mA, eliminating Schottky losses and supporting fast transient response during USB disconnect. |
| Operating Temp Range | –40°C to +85°C ambient; includes NTC thermistor interface (VNTC bias, cold/hot fault thresholds) and thermal shutdown at 105°C junction temperature. |
| Package | 14-lead 4mm × 3mm × 0.75mm DFN with exposed GND pad; optimized for thermal dissipation in space-constrained portable designs. |
| Undervoltage Lockout | VIN/VOUT UVLO at 3.8V (rising), 3.6V (falling); prevents operation below safe Li-ion discharge threshold and avoids brownout during source transitions. |
Pinout & Package
Package: 14-lead (4mm × 3mm) plastic DFN with exposed thermal pad (Pin 15 = GND). Requires PCB soldering of exposed pad for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (1) | USB VBUS Input | Primary input for USB 5V supply; current-limited by CLPROG/HPWR; clamped to 6V max steady-state. |
| OUT (2) | System Power Output | Regulated output powering load; accepts wall adapter input when VIN=0; bypassed with ≥4.7μF capacitor. |
| CLPROG (3) | Input Current Limit Programming | Resistor-to-GND sets ICL (ICL = 1000V/RCLPROG); also provides real-time IIN monitoring via VCLPROG. |
| HPWR (4) | High-Power Mode Select | Digital input: >1.2V = 100% ICL, <0.4V = 20% ICL; internal 2μA pull-down ensures default low-power startup. |
| SUSP (5) | USB Suspend Control | Pull >1.2V to reduce IIN to ≤110μA for USB suspend compliance; preserves battery charging and ideal diode function. |
| TIMER (6) | Charge Timer Capacitor | Capacitor-to-GND sets timer duration (tTIMER = CTIMER·RPROG·3h / 0.1μF·100k); shorting to GND disables charging. |
| WALL (7) | Wall Adapter Detection Input | Pull >4.25V to disable IN→OUT path and assert ACPR low; enables wall-powered charging without USB backfeed. |
| NTC (8) | Thermistor Interface Input | Connects to NTC thermistor; monitors battery temperature; charging pauses if outside valid range (cold/hot fault). |
| VNTC (9) | NTC Bias Voltage Output | Provides stable 4.4–4.85V bias for NTC network; enables accurate temperature sensing with low-drift resistors. |
| ACPR (10) | Wall Adapter Present Output | Open-drain active-low signal indicating WALL pin threshold exceeded; disabled if all supplies are below UVLO. |
| CHRG (11) | Charge Status Indicator | Open-drain output pulled low during charging; high-impedance when timer expires, EOC detected, or supply removed. |
| PROG (12) | Battery Charge Current Programming | Resistor-to-GND sets ICHG (ICHG = 50,000V/RPROG); PROG pin voltage held at 1.0V ±2% for precision programming. |
| GATE (13) | External PFET Gate Driver | Drives gate of external PFET (source=OUT, drain=BAT) to reduce ideal diode impedance; must be left floating if unused. |
| BAT (14) | Li-ion Battery Terminal | Connects to single-cell Li-ion anode; serves as charger output and ideal diode source; internal divider sets 4.1V float voltage. |
| Exposed Pad (15) | Thermal & Electrical Ground | Must be soldered to PCB GND plane for thermal management, EMI reduction, and proper device operation. |
Key Features
| Feature | Design Value |
|---|---|
| Load-Dependent Charging | Automatically scales IBAT to keep IIN = ILOAD + IBAT within programmed limit - eliminates USB overcurrent faults during concurrent load operation and charging. |
| 4.1V Float Voltage Optimization | Reduces long-term capacity loss and mechanical swelling in high-temp environments (>60°C), extending usable battery life in automotive or industrial portable equipment. |
| Integrated Ideal Diode + External PFET Control | Enables seamless switchover from USB/wall to battery backup with <100mV dropout; optional external PFET lowers conduction loss for high-current loads. |
| NTC Thermistor Interface with Fault Thresholds | Supports battery pack-level thermal monitoring with programmable cold/hot thresholds (0.738×VNTC / 0.326×VNTC) and hysteresis - prevents unsafe charging outside specified temperature range. |
| Wall Adapter Detection & Path Management | WALL pin comparator disables USB path and enables wall-powered charging via OUT→BAT, avoiding reverse current into USB host while maintaining full system functionality. |
Applications
| USB-Powered Portable Media Player | Industrial Handheld Scanner |
|---|---|
Use Scenario: MP3 player draws 300mA system load while charging 1200mAh Li-ion battery from USB port. IC Role / Device Role / Timing Role: LTC4085EDE-1#PBF acts as USB current manager, linear charger, and seamless power switch - regulating IIN to 500mA, delivering 200mA to battery, and sourcing remaining 300mA to load. Use Value: Ensures USB 2.0 compliance while maximizing charge rate; 4.1V float voltage maintains battery health during frequent hot-weather use. | Use Scenario: Rugged scanner operates in warehouses where ambient temperature exceeds 65°C and requires reliable battery backup during USB disconnection. IC Role / Device Role / Timing Role: LTC4085EDE-1#PBF manages dual inputs (USB + optional wall adapter), charges battery at 4.1V, and enables instant failover to battery via internal ideal diode during cable removal. Use Value: Prevents data loss during hot-swap events; NTC interface halts charging if battery exceeds safe temperature, improving field reliability. |
| Medical Point-of-Care Monitor | USB-C Powered Smart Sensor Hub |
Use Scenario: Battery-backed clinical monitor must remain operational during USB cable movement and maintain battery longevity across multi-year deployment. IC Role / Device Role / Timing Role: LTC4085EDE-1#PBF provides regulated 5V OUT, controls charge current to avoid overvoltage stress, and uses TIMER pin for configurable charge timeout to prevent overcharge. Use Value: 0.8% VFLOAT accuracy and C/10 termination ensure precise end-of-charge detection; SUSP pin reduces standby current to <110μA during idle periods. | Use Scenario: IoT sensor hub powered via USB-C PD (5V) charges internal battery while simultaneously powering multiple sensors and BLE radio. IC Role / Device Role / Timing Role: LTC4085EDE-1#PBF arbitrates between USB-C input and battery, limits total IIN to 500mA, and uses GATE pin to drive external PFET for low-loss battery backup during peak transmit bursts. Use Value: Internal 215mΩ ideal diode handles typical loads; external PFET support enables >1A backup current without thermal derating - critical for wireless transmission surges. |
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 |
|---|---|---|---|
| LTC4085EDD-1#PBF | Same die, 10-lead 3mm × 3mm DFN package; lacks WALL, NTC, VNTC, and ACPR pins - no wall adapter detection or thermal monitoring. | Suitable only for USB-only systems without wall input or temperature-aware charging requirements. | Select LTC4085EDE-1#PBF when wall adapter support, NTC-based thermal safety, or compact 4mm × 3mm footprint is required. |
| BQ24075RGTR | TI part with 4.2V float voltage, no ideal diode, no WALL/NTC interface; uses different current-limit programming (single resistor) and lacks load-dependent charge scaling. | Designed for basic USB charging without source arbitration or high-temp battery optimization. | Choose LTC4085EDE-1#PBF for PowerPath™ flexibility, 4.1V high-temp safety, and integrated ideal diode - BQ24075RGTR requires external diode and offers no thermal protection. |
Compared with LTC4085EDD-1#PBF and BQ24075RGTR, the LTC4085EDE-1#PBF uniquely combines wall adapter detection, NTC thermistor interface, and load-dependent charging in a thermally enhanced 14-lead DFN - enabling robust, temperature-safe operation in multi-source portable systems where battery longevity and seamless source handoff are critical.
Availability
LTC4085EDE-1#PBF is available at Aetrix Electronics and suitable for USB-powered portable media players, industrial handheld scanners, medical point-of-care monitors, and USB-C smart sensor hubs requiring stable component supply, high-temperature battery safety, and seamless power source arbitration.
Supply support for LTC4085EDE-1#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 and continues its legacy of high-performance analog, power management, and mixed-signal ICs for demanding industrial, automotive, and portable applications.
The LTC4085EDE-1#PBF belongs to Linear's PowerPath™ family of USB-aware battery chargers, engineered specifically for portable devices needing intelligent power routing, thermal-safe charging, and compliance with USB current limits across varying load conditions.
FAQ
What is the purpose of the WALL pin on the LTC4085EDE-1#PBF?
The WALL pin on the LTC4085EDE-1#PBF is a comparator input that detects presence of a wall adapter (rising threshold = 4.25V). When asserted, it disables the IN→OUT power path to prevent backfeed into the USB host and enables charging from the wall adapter via the OUT→BAT path. This ensures safe, isolated wall-powered operation without violating USB specifications - a core function of the LTC4085EDE-1#PBF's PowerPath™ architecture.
How does the LTC4085EDE-1#PBF ensure USB compliance during simultaneous charging and system load operation?
The LTC4085EDE-1#PBF ensures USB compliance by implementing load-dependent charging: it continuously adjusts battery charge current (IBAT) so that the sum of load current (ILOAD) and IBAT never exceeds the programmed input current limit (ICL). For example, with ICL = 500mA and ILOAD = 400mA, IBAT is automatically reduced to 100mA. This dynamic balancing is intrinsic to the LTC4085EDE-1#PBF's design and requires no external control logic.
Can the LTC4085EDE-1#PBF be used with a 4.2V Li-ion battery?
No - the LTC4085EDE-1#PBF is factory-trimmed for a fixed 4.1V float voltage and is not compatible with standard 4.2V Li-ion cells. It is specifically intended for applications operating or stored above ~60°C, where the reduced voltage trades initial capacity for improved long-term capacity retention and mechanical stability. Using it with a 4.2V cell would result in undercharging and reduced runtime; for 4.2V chemistry, select the standard LTC4085 (not -1 variant).
What is the function of the GATE pin on the LTC4085EDE-1#PBF?
The GATE pin on the LTC4085EDE-1#PBF drives the gate of an external P-channel MOSFET connected between BAT and OUT to enhance the ideal diode function. When enabled, it reduces conduction losses beyond the internal 215mΩ path - critical for high-current backup scenarios. The LTC4085EDE-1#PBF provides precise gate control timing and voltage levels; the external PFET's source must connect to OUT and drain to BAT, with thermal coupling recommended for overcurrent protection.
Does the LTC4085EDE-1#PBF support battery temperature monitoring?
Yes - the LTC4085EDE-1#PBF includes a dedicated NTC thermistor interface with pins NTC, VNTC, and associated circuitry to monitor battery temperature. It compares the NTC voltage against cold (0.738 × VNTC) and hot (0.326 × VNTC) thresholds with built-in hysteresis. If the battery temperature falls outside the valid range, the LTC4085EDE-1#PBF pauses charging until the condition clears - a mandatory safety feature for certified portable medical or industrial equipment.
LTC4085EDE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 1.5A
- Battery Pack Voltage:
- 4.1V
- 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-1#PBF FAQ
1.How can I place an order for LTC4085EDE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4085EDE-1#PBF 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-1#PBF reliable?
The price and inventory of LTC4085EDE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4085EDE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4085EDE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4085EDE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4085EDE-1#PBF?
LTC4085EDE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4085EDE-1#PBF 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-1#PBF?
For technical support, including LTC4085EDE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4085EDE-1#PBF requirements.
6.How does Aetrix verify that LTC4085EDE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4085EDE-1#PBF 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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4085EDE-1#PBF?
All LTC4085EDE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4085EDE-1#PBF, 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-1#PBF part is unused and in its original packaging.
Return procedure for LTC4085EDE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC4085EDE-1#PBF Tags
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