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Analog Devices Inc. LTC4065LEDC-4.1#TRMPBF
- Part No.:
- LTC4065LEDC-4.1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4065LEDC-4.1#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:531
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Product details
Overview
LTC4065LEDC-4.1#TRMPBF from Analog Devices is a standalone linear lithium-ion battery charger IC designed for single-cell 4.1V float applications. It delivers up to 250mA constant-current/constant-voltage charging with ±0.6% float voltage accuracy, thermal regulation at ~115°C, and C/10 charge termination detection - optimized for compact portable devices operating under USB power constraints.
For engineers reviewing the LTC4065LEDC-4.1#TRMPBF datasheet, LTC4065LEDC-4.1#TRMPBF pinout, LTC4065LEDC-4.1#TRMPBF application, or LTC4065LEDC-4.1#TRMPBF equivalent, this page provides verified functional context, validated pin-level circuit roles, confirmed 4.1V-specific performance boundaries, and real-world design implications for low-power wearable and ambient-temperature-sensitive battery systems.
Technical Context
The LTC4065LEDC-4.1#TRMPBF implements a three-loop control architecture (constant-current, constant-voltage, constant-temperature), where the internal P-channel MOSFET regulates charge current up to 250mA while maintaining 4.1V float voltage via precision resistor divider R1/R2. Thermal feedback reduces current when die temperature approaches 115°C, preventing overheating without external components.
It features automatic recharge triggered by ΔVRECHRG = 100mV below float voltage, programmable charge current via PROG pin (205× scaling), and integrated trickle charge (10% of full current) for batteries below 2.9V - all within a 2mm × 2mm DFN package with exposed thermal pad (Pin 7).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±0.025V (tight tolerance enables extended cycle life in high-temp backup applications) |
| Max Charge Current | 250mA (programmable via external resistor; supports low-capacity Li-ion cells) |
| Charge Termination | C/10 detection + 4.5-hour timer (dual safety mechanism per battery manufacturer guidelines) |
| Supply Voltage Range | 3.75V to 5.5V (USB-compliant; includes 3.6V UVLO with 0.6V hysteresis) |
| Shutdown Supply Current | <20µA (EN-pin activated; reduces system standby power significantly) |
| Battery Drain in Shutdown | <1µA (preserves battery charge during long idle periods) |
| Thermal Regulation Threshold | ~115°C junction (dynamic current reduction prevents thermal runaway on PCB) |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, Exposed Pad Pin 7) | Ground reference and thermal path | Primary return for all currents; exposed pad must be soldered to PCB ground for thermal integrity and electrical stability |
| CHRG (Pin 2) | Open-drain status output | Indicates active charge (pull-down), C/10 completion (high-Z), or defective battery (2Hz pulse @ 75% duty) |
| BAT (Pin 3) | Charge current output and voltage regulation node | Direct connection to battery anode; regulates 4.1V float via internal precision divider; no external blocking diode needed |
| VCC (Pin 4) | Input supply input | Accepts 3.75–5.5V; enters shutdown when VCC − VBAT < 32mV; bypass capacitor ≥1µF required |
| EN (Pin 5) | Enable/shutdown control | Pull above ~0.82V to disable; default active-low; ties to GND if unused |
| PROG (Pin 6) | Charge current programming and monitoring | 1V servo point in CC mode; IBAT = 205 × VPROG/RPROG; floating disables charge |
Key Features
| Feature | Design Value |
|---|---|
| Standalone 4.1V Li-ion charging | Eliminates need for external MOSFET, sense resistor, or blocking diode - reduces BOM count and layout complexity |
| Thermal regulation at ~115°C | Automatically throttles charge current to prevent overheating on thermally constrained PCBs without user intervention |
| C/10 charge termination detection | Provides precise end-of-charge signal for gas gauging or host MCU state management |
| Trickle charge for low-VBAT recovery | Applies 10% programmed current when BAT < 2.9V - safely revives deeply discharged cells before fast charging |
| Defective battery detection | Flags cells failing to rise above 2.9V within 1.125 hours via 2Hz CHRG pulsing - prevents unsafe charging attempts |
Applications
| Wearable Health Monitors | Industrial Backup Power Systems |
|---|---|
Use Scenario: Continuous operation of optical heart-rate sensors and Bluetooth LE radios in wrist-worn devices with coin-cell or prismatic Li-ion batteries. IC Role / Device Role / Timing Role: Standalone charger managing 4.1V float to minimize swelling and capacity loss over 2+ years of field use. Use Value: Extended battery cycle life (>500 cycles) at elevated ambient temperatures due to reduced float voltage stress. |
Use Scenario: Maintaining supercapacitor-assisted RTC or SRAM backup in programmable logic controllers during AC mains interruption. IC Role / Device Role / Timing Role: Precision 4.1V charging controller ensuring stable backup energy storage without thermal derating in enclosed enclosures. Use Value: Prevents electrolyte decomposition and gas generation in sealed backup cells, improving long-term reliability in unventilated industrial cabinets. |
| Bluetooth Audio Accessories | Low-Power IoT Edge Sensors |
Use Scenario: Recharging compact Li-ion cells in true wireless stereo earbuds with tight thermal and space constraints. IC Role / Device Role / Timing Role: Linear charger delivering up to 250mA with soft-start (170µs ramp) to avoid USB port overcurrent faults. Use Value: Enables full USB 2.0 compliance (500mA shared bus) while supporting concurrent audio streaming and charging. |
Use Scenario: Intermittent solar-charged environmental sensor nodes deployed in hot outdoor locations (e.g., rooftop HVAC monitoring). IC Role / Device Role / Timing Role: Ambient-temperature-adapted charger using 4.1V float to retain >92% initial capacity after 18 months at 60°C. Use Value: Eliminates need for external temperature compensation circuitry or firmware-based voltage adjustment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4065LEDC#TRMPBF | 4.2V float voltage; identical package, pinout, and feature set except higher float voltage | Suitable for standard-capacity Li-ion cells where ambient temperature remains ≤40°C | Select when maximum initial capacity is prioritized over long-term retention at elevated temperatures |
| MCP73831T-2ACI/OT | 4.2V float; 500mA max charge current; SOT-23-5 package; no thermal regulation loop | Higher current capability but lacks die-temperature limiting - requires careful thermal design | Prefer for cost-sensitive, non-thermally-constrained designs needing faster charge times |
Compared with LTC4065LEDC#TRMPBF and MCP73831T-2ACI/OT, the LTC4065LEDC-4.1#TRMPBF uniquely balances thermal robustness, 4.1V longevity optimization, and USB-compliant low-current operation - making it the only choice for sealed, high-ambient-temperature wearable or industrial backup applications requiring guaranteed 500+ cycle life.
Availability
LTC4065LEDC-4.1#TRMPBF is available at Aetrix Electronics and suitable for wearable health monitors, industrial backup power systems, Bluetooth audio accessories, and low-power IoT edge sensors requiring stable component supply across multi-year production cycles.
Supply support for LTC4065LEDC-4.1#TRMPBF 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.
The LTC4065L family was engineered specifically for space-constrained, USB-powered portable electronics requiring accurate, thermally aware, and fully integrated Li-ion charging - with the -4.1 variant targeting extended battery life in thermally aggressive environments.
FAQ
What is the exact float voltage specification for LTC4065LEDC-4.1#TRMPBF?
The LTC4065LEDC-4.1#TRMPBF has a nominal float voltage of 4.1V with a tolerance of ±0.025V over the full –40°C to +85°C operating temperature range. This value is factory-trimmed and applies specifically to the -4.1 variant; standard LTC4065L variants use 4.2V. The 4.1V setting trades initial capacity for superior long-term capacity retention in high-temperature or backup applications.
Does LTC4065LEDC-4.1#TRMPBF support trickle charging, and under what conditions?
Yes, the LTC4065LEDC-4.1#TRMPBF supports trickle charging at 10% of the programmed full-scale current when the BAT pin voltage is below 2.9V at startup. This low-current mode lifts the cell to a safe voltage before initiating fast charge. Trickle charge is disabled in the LTC4065LX-4.1 variant, but the LTC4065LEDC-4.1#TRMPBF retains it per its L-series designation.
How does thermal regulation function in LTC4065LEDC-4.1#TRMPBF during charging?
The LTC4065LEDC-4.1#TRMPBF incorporates a dedicated thermal regulation loop that activates when junction temperature approaches ~115°C. It dynamically reduces charge current to maintain this threshold, preventing thermal runaway without external components. This allows designers to optimize PCB copper area for typical - not worst-case - ambient conditions while guaranteeing safe operation.
Can LTC4065LEDC-4.1#TRMPBF be used with USB power sources, and what protections apply?
Yes, the LTC4065LEDC-4.1#TRMPBF is explicitly designed for USB power compatibility. It operates from 3.75V to 5.5V, includes undervoltage lockout (UVLO) at 3.6V with 0.6V hysteresis, and features undervoltage charge limiting (ΔVUVCL1 ≈ 220mV) to prevent instability caused by cable impedance. Its 250mA max current ensures compliance with USB 2.0 port limits.
What is the role of the CHRG pin on LTC4065LEDC-4.1#TRMPBF, and what states does it support?
The CHRG pin on LTC4065LEDC-4.1#TRMPBF is an open-drain status indicator with three defined states: strong pull-down during active charging, high-impedance when charge current drops to C/10 or during shutdown, and 2Hz pulsing (75% duty) when defective battery detection is triggered (BAT < 2.9V for >1.125 hours). It can drive LEDs directly or interface with microcontroller GPIOs.
LTC4065LEDC-4.1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 250mA
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC4065LEDC-4.1#TRMPBF FAQ
1.How can I place an order for LTC4065LEDC-4.1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4065LEDC-4.1#TRMPBF 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 LTC4065LEDC-4.1#TRMPBF reliable?
The price and inventory of LTC4065LEDC-4.1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4065LEDC-4.1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4065LEDC-4.1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4065LEDC-4.1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4065LEDC-4.1#TRMPBF?
LTC4065LEDC-4.1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4065LEDC-4.1#TRMPBF 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 LTC4065LEDC-4.1#TRMPBF?
For technical support, including LTC4065LEDC-4.1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4065LEDC-4.1#TRMPBF requirements.
6.How does Aetrix verify that LTC4065LEDC-4.1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4065LEDC-4.1#TRMPBF 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 LTC4065LEDC-4.1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4065LEDC-4.1#TRMPBF?
All LTC4065LEDC-4.1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4065LEDC-4.1#TRMPBF, 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 LTC4065LEDC-4.1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4065LEDC-4.1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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