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Analog Devices Inc. LTC4065EDC-4.4#TRMPBF
- Part No.:
- LTC4065EDC-4.4#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4065EDC-4.4#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LTC4065EDC-4.4 from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion battery charger IC designed for single-cell 4.4V float voltage applications. It delivers up to 750mA constant-current/constant-voltage charging with ±0.6% float voltage accuracy, thermal regulation at 115°C, and C/10 charge termination detection - all in a 2mm × 2mm 6-lead DFN package. It is optimized for USB-powered portable electronics including cellular phones and wireless PDAs.
For engineers reviewing the LTC4065EDC-4.4 datasheet, LTC4065EDC-4.4 pinout, LTC4065EDC-4.4 application, or LTC4065EDC-4.4 equivalent, key selection considerations include its integrated P-channel MOSFET architecture, programmable charge current via PROG pin resistor, automatic recharge threshold (ΔVRECHRG = 100mV), shutdown supply current <20µA, and undervoltage lockout (UVLO) at 3.6V.
Technical Context
The LTC4065EDC-4.4 implements a three-loop control architecture: constant-current (CA), constant-voltage (VA), and constant-temperature (TA), with priority logic ensuring safe mode transitions. Its internal P-channel power FET (RON = 450mΩ) eliminates need for external blocking diode or sense resistor, while thermal feedback reduces charge current when junction temperature approaches 115°C.
Operation includes trickle charge below 2.9V BAT, C/10 detection via open-drain CHRG pin, 4.5-hour internal timer termination, and automatic recharge when battery voltage drops to 4.3V. The device supports dual-input systems (USB + wall adapter) and features undervoltage charge limiting (∆VUVCL1 = 220mV) to prevent instability under high-impedance sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.4V ±0.6% - precisely regulates single-cell Li-ion at elevated voltage for higher energy density batteries. |
| Max Charge Current | 750mA with 5% accuracy - set by external PROG resistor; enables fast charging of 800–1200mAh cells. |
| Supply Voltage Range | 3.75V to 5.5V - compatible with USB 2.0 (5V±5%) and regulated wall adapters. |
| Thermal Regulation Threshold | 115°C junction - dynamically scales back charge current to prevent overheating on compact PCBs. |
| Shutdown Supply Current | <20µA - minimizes system standby power loss when input is present but charging disabled. |
| Battery Drain in Shutdown | <1µA - preserves battery capacity during long-term storage or device off-state. |
| Termination Timer | 4.5 hours typical - ensures full charge completion per battery manufacturer guidelines without overcharge risk. |
| C/10 Detection Accuracy | ±15% of programmed current - provides reliable end-of-charge signal for host microcontroller or LED indicator. |
Pinout & Package
Package: 6-lead (2mm × 2mm) plastic DFN with exposed pad (Pin 7 = GND); 0.75mm profile; RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary analog/digital ground node; must be connected to PCB ground plane. |
| CHRG (Pin 2) | Open-drain status output | Indicates active charge (pull-down), C/10 completion (high-Z), or defective battery (2Hz pulse). |
| BAT (Pin 3) | Battery connection | Delivers regulated charge current and maintains 4.4V float voltage; no external components required. |
| VCC (Pin 4) | Input supply | Accepts 3.75–5.5V; enters UVLO if <3.6V or within 30mV of BAT voltage. |
| EN (Pin 5) | Enable/shutdown control | Pull >0.82V to enter shutdown (<20µA ICCMS); default-active when tied to GND. |
| PROG (Pin 6) | Charge current programming & monitoring | Sets IBAT = 1000 × VPROG/RPROG; VPROG = 1V in CC mode; used for real-time current sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel power FET | Eliminates external MOSFET, sense resistor, and blocking diode - reduces BOM count to only two external capacitors. |
| Thermal feedback regulation | Automatically throttles charge current above 115°C junction - enables aggressive thermal design without derating. |
| C/10 charge termination | Provides precise end-of-charge signal via CHRG pin - supports accurate fuel gauging and system sleep/wake coordination. |
| Automatic recharge | Triggers new 2.25-hour cycle when BAT falls to 4.3V - maintains battery at ≥90% state-of-charge without host intervention. |
| Undervoltage charge limiting (UVCL) | Reduces IBAT when VCC − VBAT < 220mV - prevents instability with long USB cables or high-impedance wall adapters. |
| Soft-start/soft-stop | Ramps charge current over 180µs - limits inrush transients on VCC and avoids voltage droop during start/stop. |
Applications
| Smartphone Battery Management | USB-Powered Portable Medical Device |
|---|---|
Use Scenario: Charging a 1100mAh Li-ion cell in a compact smartphone with strict thermal envelope and USB-only power input. IC Role / Device Role / Timing Role: Standalone linear charger providing CC/CV/CT regulation, C/10 detection, and thermal foldback to prevent skin temperature exceedance. Use Value: Enables full USB compliance (500mA max draw) while delivering 500mA+ charge current via intelligent UVCL and low-quiescent operation. | Use Scenario: Powering a handheld glucose meter with battery backup, requiring zero-maintenance charging and ultra-low shutdown drain. IC Role / Device Role / Timing Role: Primary battery charger with automatic trickle-to-fast transition, 1µA battery drain in shutdown, and robust defective-battery detection. Use Value: Extends shelf life and field reliability by preventing deep discharge damage and flagging failed cells before system malfunction. |
| Wearable Fitness Tracker | Industrial Handheld Scanner |
Use Scenario: Recharging a 300mAh Li-ion pouch cell in a thin-profile wearable with limited PCB area and no thermal sensor. IC Role / Device Role / Timing Role: Space-optimized charger using 2mm × 2mm DFN, thermal regulation instead of external sensors, and 2.25-hour auto-recharge. Use Value: Achieves >95% capacity retention over 300 cycles without layout-level thermal design effort or firmware overhead. | Use Scenario: Field-deployed barcode scanner operating from both USB and 5V wall adapter, requiring seamless input source handover. IC Role / Device Role / Timing Role: Dual-input charger with external MOSFET control (MP1/MN1), enabling 500mA (USB) or 750mA (wall) modes without manual switching. Use Value: Eliminates user-selectable power mode; maintains optimal charge rate regardless of available source while protecting USB port integrity. |
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 |
|---|---|---|---|
| BQ24075RGER | 4.2V float voltage; 1.5A max charge current; I²C programmable; requires external sense resistor. | Targets higher-capacity cells and systems needing voltage flexibility or telemetry; not drop-in for 4.4V chemistries. | Select BQ24075RGER only if 4.2V float is acceptable and I²C control is required; verify thermal performance at 1.5A in same footprint. |
| MCP73831T-2DCI/OT | 4.2V float voltage; 500mA max; no thermal regulation; SOT-23-5 package; fixed current setting. | Suitable for cost-sensitive, low-power wearables where 4.4V is unnecessary and thermal headroom is ample. | Choose MCP73831T-2DCI/OT for simpler designs with 4.2V Li-ion cells and no thermal constraints; not suitable for high-current or 4.4V applications. |
Compared with BQ24075RGER and MCP73831T-2DCI/OT, the LTC4065EDC-4.4 uniquely supports 4.4V Li-ion chemistry with integrated thermal regulation and no external power components - making it the only option among the three that meets both elevated voltage and autonomous thermal safety requirements in minimal area.
Availability
LTC4065EDC-4.4 is available at Aetrix Electronics and suitable for smartphone battery management, USB-powered portable medical devices, wearable fitness trackers, and industrial handheld scanners requiring stable component supply and long-term lifecycle support.
Supply support for LTC4065EDC-4.4 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC4065EDC-4.4 belongs to Linear's precision battery charger IC family, engineered specifically for space-constrained, thermally sensitive portable Li-ion applications demanding high accuracy, autonomous safety features, and USB compatibility.
FAQ
What is the exact float voltage of the LTC4065EDC-4.4 and how is its accuracy specified?
The LTC4065EDC-4.4 has a preset float voltage of 4.4V with ±0.6% initial accuracy (4.375V to 4.425V at 2mA load) and ±0.8% accuracy over –40°C to 85°C (4.358V to 4.442V). This specification is guaranteed across production lots and temperature, enabling reliable charging of high-energy-density 4.4V Li-ion cells without external calibration. The LTC4065EDC-4.4 achieves this via an internal precision resistor divider disconnected during shutdown to prevent battery leakage.
Can the LTC4065EDC-4.4 be used with standard 4.2V Li-ion batteries?
No - the LTC4065EDC-4.4 is factory-trimmed for 4.4V float voltage and is not intended for 4.2V cells. Applying it to a 4.2V battery risks overvoltage stress, accelerated degradation, and safety hazards. For 4.2V applications, use pin-compatible variants like LTC4065EDC-4.2 or alternatives such as MCP73831. The LTC4065EDC-4.4 datasheet explicitly states it is "designed for high capacity single-cell lithium-ion batteries with a 4.4V float voltage."
How does the LTC4065EDC-4.4 handle thermal regulation, and what is the trigger threshold?
The LTC4065EDC-4.4 uses an internal temperature-sensing amplifier (TA loop) to reduce charge current when die temperature approaches 115°C. This constant-temperature mode activates autonomously - no external sensor or firmware is needed. Once triggered, it smoothly scales back IBAT to maintain ~115°C junction, resuming full current only after cooling. The LTC4065EDC-4.4's thermal protection is integral to its safe operation in sealed enclosures or high-ambient environments.
What is the function of the CHRG pin on the LTC4065EDC-4.4, and what states does it support?
The CHRG pin on the LTC4065EDC-4.4 is an open-drain status indicator with three distinct states: strong pull-down during active charging, high-impedance at C/10 completion or timer end, and 2Hz pulsing (75% duty cycle) when a defective battery is detected (BAT <2.9V for >1.125 hours). It can directly drive LEDs or interface with microcontroller GPIOs. Unlike generic status pins, the CHRG pin's behavior is fully defined by the LTC4065EDC-4.4's internal state machine - no external pull-up is mandatory but recommended for clean logic levels.
Does the LTC4065EDC-4.4 require external components beyond decoupling capacitors?
Yes - the LTC4065EDC-4.4 requires only two external components for basic operation: a 1µF ceramic capacitor from VCC to GND and a precision resistor (e.g., 2kΩ ±1%) from PROG to GND to set charge current. No external MOSFET, sense resistor, blocking diode, or compensation network is needed. The LTC4065EDC-4.4 integrates all power switches, references, and control loops - making it a true "standalone" solution per its official designation.
LTC4065EDC-4.4#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:
- 750mA
- Battery Pack Voltage:
- 4.4V
- 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)
LTC4065EDC-4.4#TRMPBF FAQ
1.How can I place an order for LTC4065EDC-4.4#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4065EDC-4.4#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 LTC4065EDC-4.4#TRMPBF reliable?
The price and inventory of LTC4065EDC-4.4#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4065EDC-4.4#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4065EDC-4.4#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4065EDC-4.4#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4065EDC-4.4#TRMPBF?
LTC4065EDC-4.4#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4065EDC-4.4#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 LTC4065EDC-4.4#TRMPBF?
For technical support, including LTC4065EDC-4.4#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4065EDC-4.4#TRMPBF requirements.
6.How does Aetrix verify that LTC4065EDC-4.4#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4065EDC-4.4#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 LTC4065EDC-4.4#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4065EDC-4.4#TRMPBF?
All LTC4065EDC-4.4#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4065EDC-4.4#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 LTC4065EDC-4.4#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4065EDC-4.4#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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