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Analog Devices Inc. LTC4059AEDC#TRMPBF
- Part No.:
- LTC4059AEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4059AEDC#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:570
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Product details
Overview
LTC4059AEDC#TRMPBF from Analog Devices (formerly Linear Technology) is a 900mA linear Li-ion battery charger IC with thermal regulation, fixed 4.2V float voltage (±0.6% accuracy), and open-drain ACPR status pin indicating input supply presence. It operates from 3.75V to 8V, requires no external MOSFET or sense resistor, and targets USB-powered portable devices including wireless headsets and digital cameras.
For engineers reviewing the LTC4059AEDC#TRMPBF datasheet, LTC4059AEDC#TRMPBF pinout, LTC4059AEDC#TRMPBF application, or LTC4059AEDC#TRMPBF equivalent, key selection considerations include its 2mm × 2mm DFN-6 package with exposed pad, programmable charge current up to 900mA via PROG pin, thermal foldback at ~115°C, shutdown current of 10µA, and ACPR pin functionality exclusive to the LTC4059A variant.
Technical Context
The LTC4059AEDC#TRMPBF implements a constant-current/constant-voltage/constant-temperature charging algorithm using internal P-channel power FET and precision 1.21V reference. Its dual-loop feedback architecture separates CC (CA amplifier) and CV (VA amplifier) control, with transconductance amplifier TA enabling thermal regulation by reducing charge current when die temperature approaches 115°C.
It features undervoltage lockout (UVLO) with 150mV threshold and 115mV hysteresis, manual shutdown via EN pin (0.92V threshold), and PROG pin serving both current programming (IBAT = 1000 × VPROG/RPROG) and real-time current monitoring. The ACPR pin provides open-drain indication of valid input supply - pulled low when VCC exceeds UVLO threshold, high-impedance otherwise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current Range | Programmable up to 900mA via external resistor; enables fast charging of 800mAh Li-ion cells in under 2 hours. |
| Float Voltage Accuracy | 4.2V ±0.6% (4.175V–4.225V); ensures safe full-charge termination without overvoltage stress on single-cell Li-ion batteries. |
| Input Voltage Range | 3.75V to 8V; supports direct USB 5V operation and higher-voltage wall adapters while maintaining compliance with USB power limits. |
| Thermal Regulation Threshold | Junction temperature limit ~115°C; automatically reduces charge current to prevent overheating on compact PCBs without forced airflow. |
| Shutdown Supply Current | 10µA typical; minimizes system standby power loss when charging is disabled via EN pin or input removal. |
| ACPR Pin Function | Open-drain output indicating VCC presence above UVLO; allows host µP to detect adapter insertion without additional sensing circuitry. |
| Package Thermal Resistance | θJA = 60°C/W (with exposed pad soldered); enables sustained 900mA charging at ambient ≤56°C on standard 2-layer board. |
Pinout & Package
Package: 6-lead, 2mm × 2mm plastic DFN (DC6) with exposed thermal pad (Pin 7, GND). Must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 7) | Ground reference and thermal path | Exposed pad (Pin 7) is mandatory GND connection; failure to solder degrades θJA >85°C/W and limits max current to <500mA. |
| ACPR (Pin 2) | Open-drain input supply status indicator | Pulled low when VCC > UVLO threshold (~150mV above VBAT); high-impedance when input absent or invalid - used for adapter detection. |
| BAT (Pin 3) | Charge current output and battery voltage regulation node | Delivers regulated 4.2V float voltage; internal precision divider sets voltage; disconnects in shutdown to minimize battery drain (<1µA). |
| VCC (Pin 4) | Main input supply voltage | Accepts 3.75V–8V; bypassed with ≥1µF capacitor; UVLO activates if VCC falls within 35mV of VBAT. |
| PROG (Pin 5) | Charge current programming and monitoring | 1.21V reference node; IBAT = 1000 × VPROG/RPROG; voltage proportional to actual charge current during all modes. |
| EN (Pin 6) | Enable/shutdown control input | Pull >0.92V to enter shutdown (10µA ICC, <1µA IBAT); default active-low; tie to GND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power FET | Eliminates need for external MOSFET, blocking diode, or sense resistor - reduces BOM count to two passive components (RPROG, CIN). |
| Thermal Foldback Protection | Automatically scales back charge current above ~115°C junction temperature - enables robust operation on space-constrained PCBs without heatsinks. |
| USB-Compatible Operation | Meets USB 2.0 power specifications with 5V input support and programmable current limiting - allows direct integration into USB-powered portable designs. |
| Accurate Float Voltage | 4.2V ±0.6% tolerance ensures Li-ion cell longevity and safety compliance without external trimming or calibration. |
| Low Quiescent Drain | <1µA battery current in shutdown or UVLO states - preserves battery charge during storage or long idle periods. |
Applications
| Wireless Headset Charging | Digital Camera Power Management |
|---|---|
Use Scenario: Compact Bluetooth headset with integrated Li-ion battery recharged via micro-USB port. IC Role / Device Role / Timing Role: Linear charger IC providing CC/CV charging with thermal regulation to prevent overheating in sealed enclosure. Use Value: Enables full 800mAh charge in <1.8 hours at 900mA while maintaining die temperature <115°C - critical for user comfort and battery cycle life. | Use Scenario: Portable digital camera requiring rapid recharge between photo sessions without AC adapter. IC Role / Device Role / Timing Role: Primary Li-ion charging controller interfacing directly with USB 5V source and battery pack. Use Value: ACPR pin signals host µP when USB power is connected, enabling automatic power-path switching and UI status indication. |
| Cellular Phone Auxiliary Charging | Portable Medical Sensor |
Use Scenario: Secondary charging circuit in smartphone accessory (e.g., Bluetooth speaker dock) powered from phone's USB-C port. IC Role / Device Role / Timing Role: Standalone linear charger managing battery top-off after primary charging completes. Use Value: 10µA shutdown current prevents parasitic drain when accessory is disconnected - extends shelf life of pre-charged units. | Use Scenario: Wearable ECG sensor with single-cell Li-ion battery and strict low-power requirements. IC Role / Device Role / Timing Role: Battery management IC delivering precise 4.2V float voltage and monitoring charge state via PROG pin voltage. Use Value: PROG pin output enables µP-based gas gauging without ADC overhead - improves battery runtime estimation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4054EDC#TRMPBF | Fixed 4.2V float, 400mA max charge current, no ACPR pin, same DFN-6 package. | Lacks input status indication and lower current capability - suitable only for low-power, cost-sensitive applications. | Select when 400mA suffices and ACPR functionality is unnecessary; not drop-in due to different PROG scaling and missing status pin. |
| BQ24075RGTR | 4.2V float, 1A max, integrated USB current limiting, STAT pin instead of ACPR, 16-pin QFN package. | Includes USB enumeration and input current regulation - better suited for host-controlled systems requiring compliance with USB suspend/resume. | Choose when USB port power negotiation or higher current is required; different pinout and layout incompatible with LTC4059AEDC#TRMPBF footprint. |
Compared with LTC4054EDC#TRMPBF and BQ24075RGTR, the LTC4059AEDC#TRMPBF uniquely balances compact 2mm × 2mm footprint, 900mA capability, and dedicated ACPR status signaling - making it optimal for space-constrained, adapter-detection–enabled portable chargers where thermal regulation and minimal external components are critical.
Availability
LTC4059AEDC#TRMPBF is available at Aetrix Electronics and suitable for wireless headsets, digital cameras, and portable medical sensors requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LTC4059AEDC#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 acquired Linear Technology in 2017 and maintains its high-performance analog IC portfolio, emphasizing precision, reliability, and application-specific integration for demanding industrial and portable markets.
The LTC4059AEDC#TRMPBF belongs to Linear's standalone Li-ion linear charger product line, designed specifically for USB-powered portable electronics needing minimal external components, thermal safety, and input supply awareness without host µP intervention.
FAQ
What is the maximum charge current supported by the LTC4059AEDC#TRMPBF?
The LTC4059AEDC#TRMPBF supports a programmable charge current up to 900mA, set by an external resistor connected from the PROG pin to ground. At RPROG = 1.33kΩ, the device delivers 900mA (IBAT = 1000 × 1.21V / RPROG). This value assumes adequate thermal design - the IC will automatically reduce current if junction temperature approaches 115°C.
How does the ACPR pin on the LTC4059AEDC#TRMPBF function?
The ACPR pin on the LTC4059AEDC#TRMPBF is an open-drain output that pulls low when VCC exceeds the undervoltage lockout threshold (typically ~150mV above VBAT), indicating valid input supply presence. When VCC drops below this threshold, ACPR enters high-impedance state. This allows simple µP-level detection of adapter insertion without additional circuitry - a feature exclusive to the LTC4059A variant.
Can the LTC4059AEDC#TRMPBF be used with batteries other than Li-ion?
No - the LTC4059AEDC#TRMPBF is specifically designed for single-cell Li-ion (or Li-polymer) batteries with a fixed 4.2V float voltage. It lacks the voltage flexibility or chemistry-specific termination algorithms needed for NiMH, NiCd, or LiFePO4 chemistries. For nickel-based batteries, the pin-compatible LTC4059 (not LTC4059A) supports constant-current mode via Li CC pin, but LTC4059AEDC#TRMPBF omits this functionality.
What is the role of the exposed pad on the LTC4059AEDC#TRMPBF package?
The exposed pad (Pin 7) on the LTC4059AEDC#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 60°C/W. Without proper soldering, thermal resistance increases significantly (>85°C/W), causing premature thermal foldback and limiting usable charge current to under 500mA - directly impacting performance in high-ambient or high-power applications.
How does thermal regulation work in the LTC4059AEDC#TRMPBF?
Thermal regulation in the LTC4059AEDC#TRMPBF uses an internal transconductance amplifier (TA) that monitors die temperature. When junction temperature approaches ~115°C, TA sources current into the PROG node, reducing the effective reference voltage seen by the constant-current loop. This causes automatic, continuous reduction of charge current until thermal equilibrium is reached - protecting the IC and PCB without requiring external thermal sensors or firmware intervention.
LTC4059AEDC#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:
- 900mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 8V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC4059AEDC#TRMPBF FAQ
1.How can I place an order for LTC4059AEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4059AEDC#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 LTC4059AEDC#TRMPBF reliable?
The price and inventory of LTC4059AEDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4059AEDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4059AEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4059AEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4059AEDC#TRMPBF?
LTC4059AEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4059AEDC#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 LTC4059AEDC#TRMPBF?
For technical support, including LTC4059AEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4059AEDC#TRMPBF requirements.
6.How does Aetrix verify that LTC4059AEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4059AEDC#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 LTC4059AEDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4059AEDC#TRMPBF?
All LTC4059AEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4059AEDC#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 LTC4059AEDC#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4059AEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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