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Analog Devices Inc. LTC4065LEDC-4.1#TRPBF
- Part No.:
- LTC4065LEDC-4.1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4065LEDC-4.1#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,532
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Product details
Overview
LTC4065LEDC-4.1#TRPBF from Analog Devices is a standalone linear lithium-ion battery charger IC optimized for low-capacity cells in space-constrained portable devices. 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 - enabling reliable USB-powered charging in Bluetooth headsets and multifunction wristwatches.
For engineers reviewing the LTC4065LEDC-4.1#TRPBF datasheet, LTC4065LEDC-4.1#TRPBF pinout, LTC4065LEDC-4.1#TRPBF application, or LTC4065LEDC-4.1#TRPBF equivalent, key selection criteria include its 4.1V fixed float voltage (for high-temperature or backup battery longevity), 2×2 mm DFN-6 package with exposed thermal pad, programmable charge current via single PROG resistor, and integrated trickle charge with defective battery detection.
Technical Context
The LTC4065LEDC-4.1#TRPBF implements a three-loop control architecture: constant-current (CA), constant-voltage (VA), and constant-temperature (TA), with priority arbitration via diode steering. Its internal P-channel power FET (RON = 1.5Ω typ) eliminates external blocking diodes, while the PROG pin servoing to 1.0V enables precise current programming and real-time monitoring via IBAT = VPROG × 205 / RPROG.
Operation includes automatic UVLO (3.6V rising, 3.0V falling), undervoltage charge limiting (ΔVUVCL1 = 190mV typ), soft-start (170µs), and timer-based termination (4.5 hrs typ). The CHRG pin provides open-drain status output with pull-down (charging), high-impedance (C/10 reached or shutdown), and 2Hz pulsing (defective battery detection).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±0.6% - optimized for extended capacity retention in high-ambient or backup applications, reducing swelling in prismatic/polymer Li-ion cells. |
| Max Charge Current | 250mA with 5% accuracy - programmable via single 1% resistor on PROG pin; supports low-capacity coin cells and wearables. |
| Supply Voltage Range | 3.75V to 5.5V - compliant with USB 2.0 port specifications and standard wall adapters. |
| Thermal Regulation | ~115°C junction limit - dynamically reduces charge current to prevent overheating without external components. |
| C/10 Detection | CHRG pin transitions to high-Z when charge current drops to ≤10% of programmed value - enables precise end-of-charge signaling. |
| Shutdown Supply Current | <20µA - achieved by pulling EN pin above 0.82V; reduces system standby power in battery-powered devices. |
| Battery Drain in Shutdown | <1µA - minimizes self-discharge during storage or inactive periods. |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed thermal pad (Pin 7), requiring soldering 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 path for all currents; exposed pad must be soldered to PCB ground for electrical integrity and thermal dissipation. |
| CHRG (Pin 2) | Open-drain charge status indicator | Three-state output: strong pull-down (active charge), high-impedance (C/10 reached or shutdown), 2Hz pulse (defective battery detection). |
| BAT (Pin 3) | Charge current output and voltage regulation node | Direct connection to battery anode; regulates final float voltage (4.1V) using internal precision resistor divider. |
| VCC (Pin 4) | Positive input supply | Accepts 3.75–5.5V input; includes UVLO (3.6V rising) and automatic shutdown when VCC − VBAT < 60mV. |
| EN (Pin 5) | Enable/shutdown control input | Pulling above 0.82V (typ) disables charger, reducing ICC to <20µA and IBAT drain to <1µA. |
| PROG (Pin 6) | Charge current programming and monitoring | 1V servo point for current setting; IBAT = VPROG × 205 / RPROG - enables real-time gas gauging and fault diagnostics. |
Key Features
| Feature | Design Value |
|---|---|
| Standalone linear charger | No external MOSFET, sense resistor, or blocking diode required - reduces BOM count and board area in compact designs. |
| Trickle charge conditioning | Activates at VBAT < 2.9V (10% of full current) to safely recover deeply discharged cells - prevents lithium plating and extends cycle life. |
| Defective battery detection | CHRG pulses at 2Hz (75% duty) if VBAT remains <2.9V for 1.125 hours - alerts system firmware to replace faulty cells. |
| Automatic recharge | Initiates new 2.25-hour charge cycle when BAT voltage drops ≥100mV below 4.1V - maintains battery at ~80–90% state-of-charge without host intervention. |
| Soft-start/soft-stop | 170µs current ramp-up/down - limits inrush transients on VCC and reduces stress on power supply and PCB traces. |
Applications
| Bluetooth Wireless Headsets | USB-Powered Portable MP3 Players |
|---|---|
Use Scenario: Compact, battery-operated audio device drawing power from USB for charging and operation. IC Role / Device Role / Timing Role: Standalone Li-ion charger managing full CC/CV cycle, thermal regulation, and C/10 termination without MCU supervision. Use Value: Enables direct USB charging compliance while maintaining <1µA battery drain in shutdown - extending shelf life and runtime between charges. | Use Scenario: Consumer audio player with single-cell Li-ion battery and dual-input power (USB/wall adapter). IC Role / Device Role / Timing Role: Primary battery management IC providing float voltage regulation (4.1V), programmable charge current, and automatic recharge. Use Value: Reduces bill-of-materials by eliminating discrete FETs and sense resistors, while the 4.1V float voltage improves long-term capacity retention in intermittently used devices. |
| Multifunction Wristwatches | Backup Power Systems |
Use Scenario: Space-constrained wearable with coin-cell–sized Li-ion battery and strict thermal limits. IC Role / Device Role / Timing Role: Ultra-small footprint charger delivering precise 4.1V float voltage and thermal foldback to prevent overheating in sealed enclosures. Use Value: The 2×2 mm DFN package and <1µA shutdown drain enable multi-year operation from small-capacity batteries without swelling or capacity loss. | Use Scenario: Industrial or medical device requiring fail-safe backup battery maintenance during main power outages. IC Role / Device Role / Timing Role: Maintenance charger holding backup cell at 4.1V to minimize degradation under elevated ambient temperatures. Use Value: Trade-off of initial capacity for >30% improved capacity retention after 500 cycles - validated for high-reliability backup applications per battery manufacturer guidelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone Li-ion charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4065LEDC#TRPBF | 4.2V float voltage; same package, pinout, and feature set except higher float voltage. | Optimized for maximum initial capacity in room-temperature consumer devices, not high-temp/backup use cases. | Select only if 4.2V float voltage aligns with battery chemistry and thermal environment requirements. |
| BQ24040DSQR | 4.2V float, 100mA max charge current, no trickle charge, different pinout (8-pin VSSOP), no defective battery detection. | Suitable for cost-sensitive, lower-current applications where thermal regulation and advanced diagnostics are not required. | Choose when design prioritizes lower cost over thermal robustness, diagnostic capability, and ultra-low shutdown current. |
Compared with LTC4065LEDC-4.1#TRPBF, the LTC4065LEDC#TRPBF offers higher initial capacity but reduced long-term retention in warm environments, while the BQ24040DSQR sacrifices thermal regulation, C/10 detection, and defective battery handling to achieve smaller solution size and lower unit cost.
Availability
LTC4065LEDC-4.1#TRPBF is available at Aetrix Electronics and suitable for Bluetooth headsets, USB-powered portable audio players, multifunction wristwatches, and backup power systems requiring stable component supply across production lifecycles.
Supply support for LTC4065LEDC-4.1#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 is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and signal conditioning.
The LTC4065L product line delivers highly integrated, thermally robust linear Li-ion chargers targeting space- and power-constrained portable electronics - designed specifically to simplify USB-compliant battery charging without compromising safety or longevity.
FAQ
What is the exact float voltage of the LTC4065LEDC-4.1#TRPBF and why is it set to 4.1V?
The LTC4065LEDC-4.1#TRPBF has a factory-trimmed float voltage of 4.1V ±0.6%. This reduced voltage trades off ~5–10% initial capacity to significantly improve long-term capacity retention-especially in high-ambient-temperature or backup applications-while minimizing swelling in prismatic and polymer Li-ion cells. It is not user-adjustable.
How does the LTC4065LEDC-4.1#TRPBF handle thermal regulation during charging?
The LTC4065LEDC-4.1#TRPBF uses an internal temperature-sensing amplifier (TA loop) that begins reducing charge current when junction temperature approaches ~115°C. This constant-temperature mode operates alongside CC/CV control, ensuring safe operation without external thermal sensors or layout modifications-critical for sealed or thermally constrained enclosures.
Can the LTC4065LEDC-4.1#TRPBF be used with a USB 2.0 port without violating power limits?
Yes. The LTC4065LEDC-4.1#TRPBF operates within USB 2.0 specifications: its 3.75–5.5V input range accepts standard USB VBUS, and its programmable charge current (up to 250mA) stays well within the 500mA USB 2.0 limit. Undervoltage charge limiting (ΔVUVCL1 ≈ 190mV) further ensures stable operation despite cable impedance variations.
What happens when the battery voltage falls below 2.9V at startup of the LTC4065LEDC-4.1#TRPBF?
When VBAT < 2.9V at power-up, the LTC4065LEDC-4.1#TRPBF enters trickle charge mode, delivering 10% of the programmed current to safely raise the cell voltage. If VBAT remains below 2.9V for 1.125 hours (¼ of full timer), the CHRG pin pulses at 2Hz to indicate defective battery - a safeguard not present in the LTC4065LX variants.
Is the LTC4065LEDC-4.1#TRPBF pin-compatible with other parts in the LTC4065L family?
Yes. The LTC4065LEDC-4.1#TRPBF shares identical 6-lead DFN-6 pinout, package dimensions, and terminal functions with LTC4065LEDC#TRPBF, LTC4065LXEDC-4.1#TRPBF, and LTC4065LXEDC#TRPBF. Only the float voltage (4.1V vs 4.2V) and presence of trickle charge (enabled here, disabled in X variants) differ - allowing drop-in replacement where those parameters are acceptable.
LTC4065LEDC-4.1#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC4065LEDC-4.1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4065LEDC-4.1#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 LTC4065LEDC-4.1#TRPBF reliable?
The price and inventory of LTC4065LEDC-4.1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4065LEDC-4.1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4065LEDC-4.1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4065LEDC-4.1#TRPBF?
LTC4065LEDC-4.1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4065LEDC-4.1#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 LTC4065LEDC-4.1#TRPBF?
For technical support, including LTC4065LEDC-4.1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4065LEDC-4.1#TRPBF requirements.
6.How does Aetrix verify that LTC4065LEDC-4.1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4065LEDC-4.1#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 LTC4065LEDC-4.1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4065LEDC-4.1#TRPBF?
All LTC4065LEDC-4.1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4065LEDC-4.1#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 LTC4065LEDC-4.1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4065LEDC-4.1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC4065LEDC-4.1#TRPBF Tags
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