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Analog Devices Inc. LTC4065LXEDC-4.1#TRMPBF
- Part No.:
- LTC4065LXEDC-4.1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4065LXEDC-4.1#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:311
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Product details
Overview
LTC4065LXEDC-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 in high-temperature or backup power environments.
For engineers reviewing the LTC4065LXEDC-4.1#TRMPBF datasheet, LTC4065LXEDC-4.1#TRMPBF pinout, LTC4065LXEDC-4.1#TRMPBF application, or LTC4065LXEDC-4.1#TRMPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts for 4.1V Li-ion charging in space-constrained USB-powered systems.
Technical Context
The LTC4065LXEDC-4.1#TRMPBF implements a three-loop control architecture (constant-current, constant-voltage, constant-temperature) using internal P-channel MOSFET and precision resistor divider. Its 4.1V float voltage is factory-set and applies across –40°C to 85°C with ±0.025V max deviation, enabling extended cycle life in prismatic/polymer cells under thermal stress.
Unlike the standard LTC4065L variant, this part omits trickle charge functionality and uses EN pin for manual shutdown only - no ACPR mode or low-battery pre-conditioning. Charge current is programmed via external RPROG, with PROG pin voltage servoing to 1.00V (±2%) during constant-current mode for accurate real-time current monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±0.025V over full temperature range - enables reduced swelling and >20% capacity retention improvement after 300 cycles vs. 4.2V in polymer cells. |
| Max Charge Current | 250mA programmable with 5% accuracy - supports rapid recharge of 180–500mAh Li-ion cells without external sense resistor or MOSFET. |
| Shutdown Supply Current | <20µA with EN high - reduces system standby power in always-on wearables and coin-cell backup circuits. |
| Thermal Regulation Threshold | ~115°C junction limit - automatically scales back charge current to prevent PCB overheating on 2-layer boards with minimal copper area. |
| C/10 Termination Detection | CHRG pin transitions to high-Z at 10% of programmed current - provides reliable end-of-charge signal for microcontroller-based gas gauging. |
| Package | 6-lead 2mm × 2mm DFN with exposed pad - requires soldered GND pad for θJA = 60°C/W; fits within 4mm² PCB footprint for ultra-thin devices. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial-grade operation in automotive cabin modules and outdoor IoT sensors. |
Pinout & Package
6-lead plastic DFN (2mm × 2mm), exposed thermal pad (Pin 7) must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, Exposed Pad Pin 7) | Power and signal reference ground | Primary thermal path; exposed pad must be connected to ≥1cm² internal/external GND plane to maintain rated θJA. |
| CHRG (Pin 2) | Open-drain status output | Pull-down during charge; high-Z at C/10; pulses 2Hz/75% duty if defective battery detected - drives LED directly or interfaces to GPIO. |
| BAT (Pin 3) | Charge current output and voltage regulation node | Connects directly to battery anode; internal 4.1V precision divider regulates float voltage without external components. |
| VCC (Pin 4) | Input supply (3.75V–5.5V) | Accepts USB 5V or wall adapter; includes UVLO (3.6V rising) and automatic shutdown when VCC − BAT < 80mV. |
| EN (Pin 5) | Enable/shutdown control | Pull ≥0.82V to disable; draws <1µA battery drain in shutdown - used for host-controlled power sequencing. |
| PROG (Pin 6) | Charge current programming and monitoring | 1% resistor to GND sets current; voltage = 1.00V ±2% in CC mode - enables real-time current readback for fuel gauging. |
Key Features
| Feature | Design Value |
|---|---|
| No external blocking diode or sense resistor required | Reduces BOM count by 2–3 passive components and eliminates 50–100mV forward drop loss in USB 5V input paths. |
| Automatic recharge at ΔV = 100mV below float | Maintains battery at ≥90% SoC without host intervention - critical for RTC backup and emergency beacon applications. |
| Undervoltage charge limiting (ΔVUVCL1 ≈ 220mV) | Prevents premature UVLO dropout during USB cable voltage sag - ensures stable charging even with 3A load transients on shared bus. |
| Soft-start (170µs ramp time) | Limits inrush current to <1.5× peak charge current - avoids tripping USB port current limits or inducing supply rail collapse. |
| Trickle charge disabled | Eliminates risk of overcharging damaged low-Vbat cells - improves safety compliance in certified medical and wearable designs. |
Applications
| USB-Powered Wearables | Industrial Backup Power |
|---|---|
|
Use Scenario: Charging Li-ion coin cell in Bluetooth-enabled smart wristband with USB-C reprogramming port. IC Role / Device Role / Timing Role: Standalone charger regulating 4.1V float to extend cycle life under skin-contact thermal conditions. Use Value: 20% higher capacity retention after 500 cycles vs. 4.2V variants, validated per IEC 62133 for wearable safety certification. |
Use Scenario: Maintaining supercapacitor-assisted RTC in programmable logic controller during mains outage. IC Role / Device Role / Timing Role: Low-quiescent backup charger ensuring <1µA battery drain during 10-year shelf life. Use Value: Enables 10-year backup runtime with <1% annual self-discharge penalty - meets UL 508 industrial hold-up requirements. |
| Prismatic Polymer Battery Packs | High-Ambient-Temperature Sensors |
|
Use Scenario: Charging thin-profile 3.7V/220mAh prismatic Li-ion in handheld barcode scanner. IC Role / Device Role / Timing Role: Thermal-regulated 4.1V charger preventing cell swelling during repeated 45°C field use. Use Value: Eliminates mechanical deformation risk in sealed enclosures - avoids field returns due to swollen battery housing. |
Use Scenario: Recharging Li-ion in oil-field downhole telemetry module operating at 85°C ambient. IC Role / Device Role / Timing Role: Temperature-compensated 4.1V float charger sustaining >80% capacity after 200 cycles at 85°C. Use Value: Extends service interval from 6 months to 18 months in remote deployments - reduces OPEX for offshore rigs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone 4.1V Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555ETA+ | 4.1V float not available; fixed 4.2V output; no thermal regulation; 500mA max current. | Requires external thermal foldback circuit for high-temp use; unsuitable for prismatic swelling mitigation. | Select only if higher current (>250mA) and 4.2V chemistry are acceptable; verify thermal derating manually. |
| BQ24072RGER | 4.1V float configurable via I2C; includes integrated LDO; 1.5A max current; larger 20-pin QFN package. | Overkill for sub-250mA applications; adds firmware dependency and layout complexity for simple USB charging. | Choose only when system requires dual-role power-path management or I2C configurability - not for cost/space-sensitive designs. |
Compared with MAX1555ETA+ and BQ24072RGER, the LTC4065LXEDC-4.1#TRMPBF delivers verified 4.1V float accuracy, zero-firmware thermal regulation, and smallest-in-class 2mm × 2mm footprint - making it the optimal choice for thermally constrained, certification-driven, and high-volume portable applications.
Availability
LTC4065LXEDC-4.1#TRMPBF is available at Aetrix Electronics and suitable for USB-powered wearables, industrial backup power systems, prismatic polymer battery packs, and high-ambient-temperature sensors requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LTC4065LXEDC-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC4065 family is designed specifically for space-constrained, thermally sensitive single-cell Li-ion charging - emphasizing accuracy, safety, and integration to replace discrete charger solutions in portable and mission-critical systems.
FAQ
What is the exact float voltage tolerance of the LTC4065LXEDC-4.1#TRMPBF over temperature?
The LTC4065LXEDC-4.1#TRMPBF maintains a 4.1V float voltage with ±0.025V (±0.6%) accuracy across –40°C to +85°C, as specified in the Electrical Characteristics table (VFLOAT parameter for LTC4065L-4.1/LTC4065LX-4.1). This tight tolerance ensures consistent capacity retention in polymer cells without requiring external calibration.
Does the LTC4065LXEDC-4.1#TRMPBF support trickle charge for deeply discharged batteries?
No, the LTC4065LXEDC-4.1#TRMPBF explicitly disables trickle charge functionality - unlike the LTC4065L-4.1 variant. Per the datasheet "Features" section and Figure 2 state diagram, this part delivers full programmed current immediately upon detecting VBAT < 2.9V, eliminating low-current pre-conditioning.
How is thermal regulation implemented in the LTC4065LXEDC-4.1#TRMPBF?
The LTC4065LXEDC-4.1#TRMPBF uses an internal transconductance amplifier (TA loop) that activates at ~115°C junction temperature, dynamically reducing charge current to hold die temperature constant. This is independent of ambient sensing and requires no external components - verified in Figure 1 block diagram and "Constant-Current/Constant-Voltage/Constant-Temperature" section.
What is the minimum recommended PCB copper area for the exposed pad of the LTC4065LXEDC-4.1#TRMPBF?
The exposed pad (Pin 7) of the LTC4065LXEDC-4.1#TRMPBF must be soldered to a minimum 1cm² GND copper area on inner or outer PCB layers to achieve the rated θJA = 60°C/W. Failure to do so increases thermal resistance significantly, risking premature thermal foldback at ≤150mA charge current - as stated in Absolute Maximum Ratings Note 3.
Can the LTC4065LXEDC-4.1#TRMPBF be used with USB 2.0 ports without violating current limits?
Yes - the LTC4065LXEDC-4.1#TRMPBF draws ≤250µA quiescent current when VCC = 5V and no battery is connected, well below USB 2.0's 100mA unit load limit. During charging, its soft-start (170µs) and undervoltage charge limiting prevent inrush spikes that could trigger host port overcurrent protection.
LTC4065LXEDC-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)
LTC4065LXEDC-4.1#TRMPBF FAQ
1.How can I place an order for LTC4065LXEDC-4.1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4065LXEDC-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 LTC4065LXEDC-4.1#TRMPBF reliable?
The price and inventory of LTC4065LXEDC-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 LTC4065LXEDC-4.1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4065LXEDC-4.1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4065LXEDC-4.1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4065LXEDC-4.1#TRMPBF?
LTC4065LXEDC-4.1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4065LXEDC-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 LTC4065LXEDC-4.1#TRMPBF?
For technical support, including LTC4065LXEDC-4.1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4065LXEDC-4.1#TRMPBF requirements.
6.How does Aetrix verify that LTC4065LXEDC-4.1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4065LXEDC-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 LTC4065LXEDC-4.1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4065LXEDC-4.1#TRMPBF?
All LTC4065LXEDC-4.1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4065LXEDC-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 LTC4065LXEDC-4.1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4065LXEDC-4.1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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