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Analog Devices Inc. LTC4065LXEDC#TRMPBF
- Part No.:
- LTC4065LXEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4065LXEDC#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:464
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Product details
Overview
LTC4065LXEDC#TRMPBF 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 charging with ±0.6% float voltage accuracy, C/10 charge termination detection, and thermal regulation at ~115°C. It operates directly from USB (4.3–5.5V) and supports automatic recharge, shutdown mode (<20µA supply current), and <1µA battery drain in standby.
For engineers reviewing the LTC4065LXEDC#TRMPBF datasheet, LTC4065LXEDC#TRMPBF pinout, LTC4065LXEDC#TRMPBF application, or LTC4065LXEDC#TRMPBF equivalent, this page provides verified technical context, exact pin functions, real-world application mappings, and validated alternative parts for low-power Li-ion charging designs requiring high float voltage precision and minimal external components.
Technical Context
The LTC4065LXEDC#TRMPBF implements a three-loop control architecture-constant-current (CA), constant-voltage (VA), and constant-temperature (TA)-with diode-priority arbitration between CA and VA loops. Its internal P-channel power FET (RON = 1.5Ω typ.) eliminates need for external blocking diodes or sense resistors.
It features programmable charge current via PROG pin (205× scaling factor), 2Hz CHRG pulse output for defective battery detection, and automatic UVLO (3.6V rising threshold) with 0.6V hysteresis. Unlike the standard LTC4065L, this variant omits trickle charge functionality and uses a fixed 4.1V float voltage optimized for high-temperature or backup battery longevity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±0.6% - precisely regulates battery terminal voltage to extend cycle life in elevated ambient or prismatic cell applications |
| Max Charge Current | 250mA - programmable via single resistor (RPROG), enabling accurate low-current charging for small-capacity Li-ion cells |
| Supply Voltage Range | 3.75V to 5.5V - compliant with USB 2.0 port specifications and standard wall adapters |
| Shutdown Supply Current | <20µA - enables ultra-low-power system sleep states without compromising battery retention |
| Thermal Regulation Threshold | ~115°C - dynamically reduces charge current to prevent die overheating on compact PCBs without heatsinking |
| C/10 Termination Detection | Yes, via open-drain CHRG pin - signals end-of-charge with high-impedance transition, usable for host microcontroller polling or LED control |
| Battery Drain Current (Standby) | <1µA - preserves battery capacity during prolonged disconnection from input power |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed thermal pad (Pin 7), rated θJA = 60°C/W. Exposed pad must be soldered to PCB ground plane for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, Exposed Pad Pin 7) | Ground reference and thermal path | Primary return for all internal circuits; exposed pad is mandatory for thermal dissipation and noise immunity |
| CHRG (Pin 2) | Open-drain status output | Three-state indicator: strong pull-down during charge, high-Z at C/10, 2Hz pulsing for defective battery detection |
| BAT (Pin 3) | Charge current output and voltage regulation node | Direct connection to battery anode; internal precision divider sets 4.1V float; no external resistor required |
| VCC (Pin 4) | Main input supply | Accepts 3.75–5.5V; includes UVLO (3.6V rising) and automatic shutdown when VCC ≤ VBAT + 32mV |
| EN (Pin 5) | Enable/shutdown control | Pull >0.82V to enter shutdown (<20µA ICC); default-active low; tie to GND if unused |
| PROG (Pin 6) | Charge current programming and monitoring | 1V servo point in CC mode; IBAT = 205 × VPROG/RPROG; enables real-time gas gauging without additional circuitry |
Key Features
| Feature | Design Value |
|---|---|
| No external MOSFET or sense resistor required | Reduces BOM count and layout area; integrates 1.5Ω P-FET and precision current mirror (205× scaling) |
| Trickle charge disabled | Differentiates LTC4065LX variants - avoids low-voltage pre-conditioning, simplifying charge logic for known-good cells |
| 4.1V float voltage option | Optimized for high-temperature operation or polymer/prismatic cells where 4.2V accelerates swelling and capacity fade |
| Soft-start (170µs ramp) | Minimizes inrush current into input capacitors and prevents USB port overcurrent faults during plug-in events |
| Internal 4.5-hour termination timer | Ensures safe charge cutoff per battery manufacturer guidelines even if C/10 detection fails or battery is defective |
Applications
| Wearable Health Monitors | Bluetooth Earbuds |
|---|---|
Use Scenario: Continuous 24/7 operation with periodic USB recharging in compact, thermally isolated enclosures. IC Role / Device Role / Timing Role: Standalone Li-ion charger managing 100–200mAh cells with strict thermal budget and no host MCU intervention. Use Value: 4.1V float voltage extends battery cycle life by >30% at 45°C ambient versus 4.2V variants, critical for medical-grade wearables. |
Use Scenario: Dual-earbud charging case powered via micro-USB, requiring fast, reliable top-up between usage sessions. IC Role / Device Role / Timing Role: Primary charging controller delivering 150mA CC/CV with automatic recharge when case voltage drops below 4.0V. Use Value: C/10 detection and CHRG pin enable simple LED status feedback without firmware overhead; <1µA standby drain preserves case charge for weeks. |
| Smartwatches with Polymer Cells | Industrial Sensor Tags |
Use Scenario: Thin-profile wristwatch using prismatic Li-polymer battery sensitive to mechanical swelling under full 4.2V float. IC Role / Device Role / Timing Role: Integrated charger enforcing 4.1V ceiling to mitigate long-term cell expansion while maintaining >95% usable capacity. Use Value: Eliminates need for external voltage dividers or DAC-based float adjustment; factory-trimmed 4.1V accuracy removes calibration step. |
Use Scenario: Battery-powered wireless sensor node deployed in hot environments (e.g., HVAC ducts, solar inverters) with infrequent USB maintenance. IC Role / Device Role / Timing Role: Maintenance-free charging subsystem that sustains 180mAh Li-ion cell across 5+ years of field operation. Use Value: Thermal regulation at 115°C prevents premature failure in enclosed enclosures; <20µA shutdown current ensures multi-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-2DCI/OT | 4.2V float only; no 4.1V option; 500mA max charge current; requires external thermal foldback resistor | Higher current capability but lacks native 4.1V optimization for high-temp longevity | Choose when higher charge rate is prioritized over thermal derating and cell lifetime extension |
| BQ24075RGER | 4.2V float; integrated USB current limiting (100mA/500mA selectable); no C/10 status output; larger 16-pin QFN package | Designed for host-controlled systems with USB enumeration; not suited for fully autonomous charging | Prefer when USB compliance (BC1.2) and host communication are required over minimal footprint and autonomous operation |
Compared with MCP73831T-2DCI/OT and BQ24075RGER, the LTC4065LXEDC#TRMPBF uniquely combines 4.1V float precision, 2×2mm DFN size, C/10 status signaling, and zero-external-component operation-making it optimal for thermally constrained, self-contained Li-ion charging where battery longevity outweighs peak current demand.
Availability
LTC4065LXEDC#TRMPBF is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth earbuds, smartwatches, industrial sensor tags, and USB-powered portable instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for LTC4065LXEDC#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 (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 LTC4065LX series belongs to Analog Devices' precision battery management portfolio, engineered specifically for ultra-compact, low-power, autonomous Li-ion charging in consumer and industrial wearables where thermal safety and cell longevity are design-critical.
FAQ
What is the exact float voltage of the LTC4065LXEDC#TRMPBF?
The LTC4065LXEDC#TRMPBF has a factory-trimmed constant-voltage float setting of 4.1V with ±0.6% accuracy over –40°C to 85°C. This value is fixed and non-adjustable-unlike the standard LTC4065L (4.2V) or LTC4065L-4.1 (also 4.1V but with trickle charge enabled). The 4.1V target specifically trades initial capacity for improved long-term retention in high-ambient or polymer-cell applications.
Does the LTC4065LXEDC#TRMPBF support trickle charge for deeply discharged batteries?
No, the LTC4065LXEDC#TRMPBF explicitly disables trickle charge functionality. Unlike the LTC4065L-4.1 variant, it delivers full programmed charge current immediately upon detecting a low battery voltage (below 2.9V), omitting the 10%-rate pre-conditioning phase. This behavior is confirmed in the datasheet's "LTC4065 Options" table and "Trickle Charge Disabled" note in the block diagram.
How does the CHRG pin behave during normal operation of the LTC4065LXEDC#TRMPBF?
During active charging, the CHRG pin of the LTC4065LXEDC#TRMPBF is actively pulled low (≤105mV at 5mA load). When charge current falls to ≤10% of the programmed value (C/10), it transitions to high-impedance state. If the battery remains below 2.9V for 1.125 hours, CHRG pulses at 2Hz (75% duty cycle) indicating defective battery-behavior identical to the LTC4065L-4.1 but distinct from the trickle-enabled variants.
What package type and thermal requirements apply to the LTC4065LXEDC#TRMPBF?
The LTC4065LXEDC#TRMPBF uses a 6-lead 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 7). The exposed pad must be soldered to a PCB ground plane to achieve the specified θJA = 60°C/W. Failure to do so results in significantly degraded thermal performance and potential thermal shutdown during sustained 250mA operation.
Can the LTC4065LXEDC#TRMPBF be used with USB 2.0 power sources?
Yes, the LTC4065LXEDC#TRMPBF is explicitly designed for USB compatibility: its 3.75–5.5V VCC range accepts standard USB 2.0 voltages (4.75–5.25V), and its undervoltage lockout (3.6V rising) and ΔVUVCL1 (~220mV) features prevent false shutdowns caused by cable drop or transient loads. It draws <20µA in shutdown and <1µA in standby-well within USB suspend limits.
LTC4065LXEDC#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:
- 4.2V
- 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#TRMPBF FAQ
1.How can I place an order for LTC4065LXEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4065LXEDC#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#TRMPBF reliable?
The price and inventory of LTC4065LXEDC#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4065LXEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4065LXEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4065LXEDC#TRMPBF?
LTC4065LXEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4065LXEDC#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#TRMPBF?
For technical support, including LTC4065LXEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4065LXEDC#TRMPBF requirements.
6.How does Aetrix verify that LTC4065LXEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4065LXEDC#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4065LXEDC#TRMPBF?
All LTC4065LXEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4065LXEDC#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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4065LXEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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