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Analog Devices Inc. LTC4065LXEDC#TRPBF
- Part No.:
- LTC4065LXEDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4065LXEDC#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,235
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Product details
Overview
LTC4065LXEDC#TRPBF from Analog Devices is a standalone linear lithium-ion battery charger IC designed for single-cell 4.1V float applications in space-constrained portable devices. It delivers up to 250mA constant-current/constant-voltage charge 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 coin-cell–based wearables.
For engineers reviewing the LTC4065LXEDC#TRPBF datasheet, LTC4065LXEDC#TRPBF pinout, LTC4065LXEDC#TRPBF application, or LTC4065LXEDC#TRPBF equivalent, key selection criteria include its 4.1V fixed float voltage, absence of trickle charge (distinguishing it from LTC4065L variants), 2×2mm DFN-6 package with exposed thermal pad, and EN-controlled shutdown with <20µA supply current.
Technical Context
The LTC4065LXEDC#TRPBF implements a three-loop control architecture: constant-current (servoing PROG pin to 1.0V), constant-voltage (regulating BAT to 4.1V via internal R1/R2 divider), and constant-temperature (limiting junction temperature to ~115°C using TA amplifier). Its internal P-channel power FET eliminates need for external blocking diode or sense resistor.
Unlike the standard LTC4065L, this variant omits low-battery trickle charge - confirmed by datasheet Note 7 and "TRICKLE CHARGE?" column in Options table - and uses EN pin for manual shutdown only (no ACPR mode). Operation requires VCC ≥ 3.75V, with automatic UVLO engagement below 3.4V (rising) and undervoltage charge limiting activated when (VCC – VBAT) < 150mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±0.6% - optimized for high-temperature or backup battery longevity, reducing swelling in prismatic/polymer cells |
| Max Charge Current | 250mA programmable via PROG resistor - supports precise low-current charging for small-capacity Li-ion cells (e.g., 180mAh) |
| Termination Method | C/10 detection + 4.5-hour timer - dual-safety termination per battery manufacturer guidelines |
| Shutdown Supply Current | <20µA - enables ultra-low-power standby in always-on wearable systems |
| Package | 6-lead 2mm × 2mm DFN with exposed GND pad - requires PCB soldering for rated θJA = 60°C/W thermal performance |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and extended-ambient consumer applications |
| Thermal Regulation | Active junction temperature limit at ~115°C - dynamically reduces charge current to prevent overheating without external components |
Pinout & Package
Package: 6-lead plastic DFN (2mm × 2mm), exposed thermal pad (Pin 7) - must be soldered to PCB ground plane for electrical continuity and 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 is mandatory GND connection for thermal dissipation |
| CHRG (Pin 2) | Open-drain status output | Pull-down during charge; high-Z at C/10; pulses 2Hz if defective battery detected (VBAT < 2.9V for >1.125h) |
| BAT (Pin 3) | Charge current output & voltage regulation node | Direct connection to battery anode; regulates to 4.1V float; internal precision divider disconnected in shutdown |
| VCC (Pin 4) | Main input supply | Accepts 3.75V–5.5V (USB/wall adapter); enters UVLO if <3.4V; auto-shutdown when VCC ≤ VBAT + 30mV |
| EN (Pin 5) | Enable/shutdown control | Pulled low for normal operation; >0.82V forces shutdown (<20µA ICCMS, <1µA IBMS) |
| PROG (Pin 6) | Charge current programming & monitoring | 1% resistor to GND sets IBAT = 205 × (1V / RPROG); PROG voltage directly indicates real-time charge current |
Key Features
| Feature | Design Value |
|---|---|
| No external MOSFET or sense resistor required | Integrated P-channel power FET and current-sense architecture reduce BOM count and PCB footprint |
| 4.1V float voltage option | Extends cycle life and minimizes swelling in prismatic/polymer Li-ion cells under high ambient temperature or backup use |
| Trickle charge disabled | LTC4065LX variant behavior - avoids unnecessary low-current stress on healthy batteries; simplifies state management |
| CHRG pin with multi-state indication | Supports LED drive or microcontroller GPIO monitoring: active pull-down (charging), high-Z (C/10 or shutdown), 2Hz pulse (defective battery) |
| Soft-start and soft-stop | 170µs current ramp-up/down limits inrush transients - critical for stable USB port compliance and low-ESR capacitor compatibility |
Applications
| Bluetooth Wireless Headset | Smart Wristwatch with Backup Battery |
|---|---|
Use Scenario: Compact wearable requiring USB-rechargeable Li-ion cell with minimal heat generation and long calendar life. IC Role / Device Role / Timing Role: Standalone linear charger regulating 4.1V float and terminating at C/10 to preserve polymer cell integrity. Use Value: Eliminates need for external FET/diode/sense resistor; thermal regulation prevents overheating during charging in sealed enclosure. |
Use Scenario: Multifunction wristwatch using prismatic Li-ion as main power with secondary backup cell. IC Role / Device Role / Timing Role: Primary charger for main cell; 4.1V float extends capacity retention over 5+ years of intermittent use. Use Value: Reduced float voltage mitigates electrolyte decomposition and swelling - critical for thin-profile, hermetically sealed watch design. |
| Portable MP3 Player | Coin-Cell–Based Medical Sensor |
Use Scenario: Low-cost audio player with 200–300mAh Li-ion battery powered via micro-USB. IC Role / Device Role / Timing Role: USB-compliant linear charger delivering 150mA CC/CV with automatic recharge when battery drops to 4.0V. Use Value: EN pin allows host MCU to disable charging during firmware updates; <1µA battery drain in shutdown preserves runtime. |
Use Scenario: Disposable diagnostic patch using Li-ion coin cell (e.g., ML1220) with strict size and leakage constraints. IC Role / Device Role / Timing Role: Ultra-small-footprint charger (2×2mm DFN) enabling direct integration into sub-10mm² PCB area. Use Value: 250mA max current supports fast initial charge; no trickle charge avoids parasitic drain on low-capacity coin cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone Li-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4065L-4.1EDC#TRPBF | Includes trickle charge (15.5mA @ VBAT=2V); same 4.1V float and package | Suitable for deeply discharged cells needing pre-conditioning before full charge | Select when battery may sit at <2.9V for extended periods; avoid if minimizing complexity and leakage is priority |
| MCP73831T-2ACI/OT | 4.2V float; 500mA max; SOT-23-5 package; no thermal regulation or C/10 detection | Higher current, smaller package, but lacks temperature-aware charging and precise termination | Prefer for cost-sensitive, non-thermal-critical designs where 4.2V float is acceptable and board space is extremely limited |
Compared with LTC4065LXEDC#TRPBF, the LTC4065L-4.1EDC#TRPBF adds trickle charge capability at the cost of slightly higher quiescent drain, while the MCP73831T-2ACI/OT trades thermal regulation and C/10 precision for lower cost and smaller footprint - making LTC4065LXEDC#TRPBF optimal for thermally constrained, longevity-focused 4.1V Li-ion systems.
Availability
LTC4065LXEDC#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, Bluetooth audio accessories, smart wearables, and coin-cell–powered IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC4065LXEDC#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC4065 family targets compact, USB-powered Li-ion charging in space- and thermal-constrained applications - emphasizing integration, accuracy, and safety without external discrete components.
FAQ
What is the float voltage of the LTC4065LXEDC#TRPBF and why is it set to 4.1V?
The LTC4065LXEDC#TRPBF has a fixed 4.1V float voltage, specified with ±0.6% accuracy across temperature. This reduced voltage trades off initial capacity for significantly improved long-term capacity retention - especially beneficial in high-ambient-temperature environments or backup battery applications where minimizing electrolyte decomposition and cell swelling is critical. The LTC4065LXEDC#TRPBF achieves this without requiring external resistors or configuration pins.
Does the LTC4065LXEDC#TRPBF support trickle charging for deeply discharged batteries?
No, the LTC4065LXEDC#TRPBF explicitly disables trickle charge - a defining feature of the "X" variant per the datasheet Options table and Note 7. Unlike the LTC4065L-4.1EDC#TRPBF, it applies full programmed charge current immediately upon detecting VBAT > 2.9V. This simplifies system behavior and eliminates unnecessary low-current stress on healthy batteries, aligning with applications where cells are rarely deeply depleted.
How does thermal regulation work in the LTC4065LXEDC#TRPBF?
The LTC4065LXEDC#TRPBF incorporates an internal thermal feedback loop that activates when junction temperature approaches ~115°C. It dynamically reduces charge current to maintain safe die temperature - independent of ambient conditions - without requiring external thermal sensors or circuitry. This allows designers to optimize PCB copper area for typical, not worst-case, thermal conditions while ensuring robustness during transient overload or high-ambient operation.
What is the function of the CHRG pin on the LTC4065LXEDC#TRPBF?
The CHRG pin on the LTC4065LXEDC#TRPBF is an open-drain status indicator with three distinct states: strong pull-down during active charging, high-impedance when charge current falls to C/10 or during shutdown, and 2Hz pulsing (75% duty cycle) if a defective battery is detected (VBAT < 2.9V persisting >1.125 hours). It supports direct LED drive or microcontroller GPIO monitoring without external pull-ups in most configurations.
Can the LTC4065LXEDC#TRPBF be used with USB power sources?
Yes, the LTC4065LXEDC#TRPBF is specifically designed for USB power compliance: it operates from 3.75V–5.5V input, includes undervoltage lockout (UVLO) with hysteresis, and features undervoltage charge limiting (ΔVUVCL1) to prevent instability caused by cable impedance. Its 250mA max charge current and <20µA shutdown current meet USB 2.0 port power constraints while enabling full-featured charging without external components.
LTC4065LXEDC#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:
- 4.2V
- 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#TRPBF FAQ
1.How can I place an order for LTC4065LXEDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4065LXEDC#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 LTC4065LXEDC#TRPBF reliable?
The price and inventory of LTC4065LXEDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4065LXEDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4065LXEDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4065LXEDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4065LXEDC#TRPBF?
LTC4065LXEDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4065LXEDC#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 LTC4065LXEDC#TRPBF?
For technical support, including LTC4065LXEDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4065LXEDC#TRPBF requirements.
6.How does Aetrix verify that LTC4065LXEDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4065LXEDC#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 LTC4065LXEDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4065LXEDC#TRPBF?
All LTC4065LXEDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4065LXEDC#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 LTC4065LXEDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC4065LXEDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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