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Analog Devices Inc. LTC4065EDC#TRPBF
- Part No.:
- LTC4065EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4065EDC#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,678
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Product details
Overview
LTC4065EDC#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion battery charger IC designed for single-cell 4.2V Li-Ion batteries in portable electronics. It delivers up to 750mA programmable charge current with ±5% accuracy, features C/10 termination detection, thermal regulation limiting die temperature to 115°C, and operates from 3.75V–5.5V input - including direct USB port compatibility.
For engineers reviewing the LTC4065EDC#TRPBF datasheet, LTC4065EDC#TRPBF pinout, LTC4065EDC#TRPBF application, or LTC4065EDC#TRPBF equivalent, this page provides verified functional identity, validated 6-lead DFN package mapping, confirmed thermal feedback architecture, exact PROG-resistor-based current programming behavior, and real-world USB/wall adapter dual-power implementation constraints.
Technical Context
The LTC4065EDC#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 MOSFET eliminates need for external blocking diode or sense resistor, while PROG pin servoing at 1.0V enables precise current setting via RPROG.
Operation includes automatic trickle charge below 2.9V BAT, timer-based termination (4.5 hrs typ.), automatic recharge when VBAT drops ≤4.1V, and undervoltage charge limiting (∆VUVCL1 = 220mV typ.) to prevent instability with high-impedance sources like long USB cables. Shutdown mode draws <20µA ICC and <1µA battery drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current Range | Programmable 88–750mA via external RPROG; 5% accuracy ensures predictable fast-charge time and thermal budget. |
| Float Voltage Accuracy | 4.2V ±0.6% (4.175–4.225V); maintains cell longevity and avoids overvoltage stress per JEITA guidelines. |
| Thermal Regulation Threshold | Junction temperature limit of 115°C; dynamically reduces charge current to prevent PCB overheating without external thermal sensors. |
| C/10 Termination Detection | CHRG pin transitions to high-impedance at 10% of programmed current; enables reliable end-of-charge signaling for host microcontrollers. |
| Input Voltage Range | 3.75V–5.5V; supports standard USB 5V and wall adapters while maintaining full charge current above VBAT + 220mV. |
| Shutdown Supply Current | <20µA (ICCMS); minimizes standby power loss in battery-backed systems during idle periods. |
| Package Dimensions | 2mm × 2mm × 0.75mm 6-lead DFN; enables ultra-compact layout in space-constrained PDA, smartphone, and wearable designs. |
Pinout & Package
Package: 6-lead, 2mm × 2mm × 0.75mm plastic DFN with exposed pad (Pin 7 = GND). Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary analog/digital return; connects to exposed pad for thermal conduction and low-impedance grounding. |
| CHRG (Pin 2) | Open-drain status output | Indicates active charge (pull-down), C/10 completion (high-Z), or defective battery (2Hz pulse); drives LEDs or GPIOs directly. |
| BAT (Pin 3) | Battery charge node | Delivers regulated charge current to Li-Ion cell; integrates precision 4.2V voltage reference divider disconnected in shutdown. |
| VCC (Pin 4) | Input supply | Accepts 3.75–5.5V; internal UVLO (3.6V rising) prevents operation until adequate input is present. |
| EN (Pin 5) | Enable control | Pull >0.82V to enter shutdown (<20µA ICC); default-active; tie to GND if unused. |
| PROG (Pin 6) | Current programming & monitor | Sets charge current via RPROG to GND; voltage = 1.0V in CC mode; enables real-time current monitoring (IBAT = 1000 × VPROG/RPROG). |
Key Features
| Feature | Design Value |
|---|---|
| No external MOSFET or sense resistor required | Integrated P-channel power FET (RON = 450mΩ) and current-sense architecture reduce BOM count and PCB area by ≥3 components. |
| Automatic recharge threshold | Triggers new charge cycle when VBAT falls to 4.1V (ΔV = 100mV below float); maintains battery at ≥85% SoC without host intervention. |
| Soft-start and soft-stop | 180µs current ramp-up/down limits inrush transients on VCC and reduces EMI during charge initiation/termination. |
| Defective battery detection | Monitors low-VBAT duration; pulses CHRG at 2Hz (75% duty) after 1.125 hrs in trickle mode to flag failed cells. |
| Undervoltage charge limiting (UVCL) | Reduces charge current when VCC – VBAT < 220mV; prevents oscillation and dropout with high-impedance USB sources. |
Applications
| Wireless PDAs | Cellular Phones |
|---|---|
Use Scenario: Compact handheld device with removable Li-Ion battery and dual-input (USB + wall adapter) charging. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, thermal foldback, and automatic recharge without MCU supervision. Use Value: Enables 2mm × 2mm footprint, eliminates discrete FET/sense resistor, and sustains 750mA charge even with 1.5m USB cable impedance. |
Use Scenario: Entry-level smartphone requiring cost-effective, small-footprint battery management with USB compliance. IC Role / Device Role / Timing Role: Primary Li-Ion charger IC handling trickle-to-fast transition, C/10 termination, and 4.5-hour safety timer. Use Value: Reduces system-level component count by 4 parts vs discrete solution; meets USB-IF voltage drop requirements under load. |
| Portable Medical Monitors | Bluetooth Headsets |
Use Scenario: Battery-powered clinical device needing reliable, low-noise charging with minimal thermal rise during continuous operation. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with die-temperature-regulated current limiting to avoid sensor drift near battery. Use Value: Thermal loop maintains ≤115°C junction temp without heatsink; <1µA battery drain in shutdown extends shelf life. |
Use Scenario: Ultra-small wearable audio device with tight board space and strict quiescent current budget. IC Role / Device Role / Timing Role: Single-cell Li-Ion charger providing automatic recharge, C/10 detection, and <20µA shutdown current. Use Value: 2mm × 2mm DFN fits within 8mm × 8mm headset PCB; PROG pin monitoring supports fuel-gauging integration. |
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 |
|---|---|---|---|
| TP4056 | Fixed 1A charge current; no PROG pin monitoring; no thermal regulation; 4.2V ±1% float voltage. | Lacks current programmability, real-time current sensing, and die-temperature feedback - unsuitable for thermally constrained layouts. | Select LTC4065EDC#TRPBF when design requires adjustable current, thermal foldback, or battery current telemetry. |
| BQ24075 | Integrated USB current limiting (100mA/500mA select); higher quiescent current (65µA shutdown); 20-pin QFN package. | Designed for host-controlled systems with USB enumeration; larger footprint and higher standby loss than LTC4065EDC#TRPBF. | Choose LTC4065EDC#TRPBF for autonomous, space-limited, low-IQ applications without USB protocol stack dependency. |
Compared with TP4056 and BQ24075, the LTC4065EDC#TRPBF offers superior thermal management for compact enclosures, precise current programmability for optimized charge time vs. dissipation trade-offs, and lower shutdown current for extended battery shelf life - making it ideal for unattended portable devices.
Availability
LTC4065EDC#TRPBF is available at Aetrix Electronics and suitable for wireless PDAs, cellular phones, and portable medical monitors requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC4065EDC#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4065EDC#TRPBF belongs to Linear's legacy "LTC" battery management portfolio, engineered specifically for space-constrained, USB-compatible portable electronics demanding autonomous, thermally robust Li-Ion charging with minimal external components.
FAQ
What is the maximum charge current supported by the LTC4065EDC#TRPBF?
The LTC4065EDC#TRPBF supports a maximum programmable charge current of 750mA with ±5% accuracy, achieved using a 1.54kΩ 1% resistor from PROG to GND. This value is confirmed in the Electrical Characteristics table (IBAT = 475–525mA at RPROG = 2kΩ, scaling linearly to 750mA at RPROG ≈ 1.54kΩ). The IC maintains this current only when thermal regulation is inactive and input voltage exceeds VBAT + 220mV.
Does the LTC4065EDC#TRPBF require an external MOSFET or sense resistor?
No, the LTC4065EDC#TRPBF does not require an external MOSFET or sense resistor. It integrates a P-channel power FET with 450mΩ typical RON and uses internal current sensing referenced to the PROG pin. This eliminates two critical external components, reducing BOM cost and PCB area - a key advantage explicitly stated in the FEATURES section and block diagram.
How does thermal regulation work in the LTC4065EDC#TRPBF?
The LTC4065EDC#TRPBF uses a dedicated constant-temperature (TA) feedback loop that activates when junction temperature approaches 115°C. It dynamically reduces charge current to maintain die temperature at or below this threshold, preventing thermal runaway without external sensors. This behavior is documented in the OPERATION section and confirmed in Figure G06 (Charge Current vs Temperature with Thermal Control Loop in Operation).
What is the function of the PROG pin on the LTC4065EDC#TRPBF?
The PROG pin on the LTC4065EDC#TRPBF serves dual functions: (1) charge current programming - connecting a resistor RPROG to GND sets IBAT = 1000 × VPROG/RPROG, where VPROG is regulated to 1.0V in constant-current mode; (2) real-time current monitoring - measuring VPROG allows calculation of instantaneous IBAT at any time, supporting gas gauging applications.
Can the LTC4065EDC#TRPBF be used with USB power sources?
Yes, the LTC4065EDC#TRPBF is explicitly designed for USB compatibility. It operates from 3.75V–5.5V input, includes undervoltage charge limiting (UVCL) to handle USB cable impedance, and supports direct charging from standard USB ports. The datasheet states "Charges Single Cell Li-Ion Batteries Directly from USB Port" and provides Figure F03 showing dual USB/wall adapter implementation.
LTC4065EDC#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:
- 750mA
- 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)
LTC4065EDC#TRPBF FAQ
1.How can I place an order for LTC4065EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4065EDC#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 LTC4065EDC#TRPBF reliable?
The price and inventory of LTC4065EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4065EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4065EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4065EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4065EDC#TRPBF?
LTC4065EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4065EDC#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 LTC4065EDC#TRPBF?
For technical support, including LTC4065EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4065EDC#TRPBF requirements.
6.How does Aetrix verify that LTC4065EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4065EDC#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 LTC4065EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4065EDC#TRPBF?
All LTC4065EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4065EDC#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 LTC4065EDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC4065EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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