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Analog Devices Inc. LTC4059EDC#TRMPBF
- Part No.:
- LTC4059EDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4059EDC#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:126
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Product details
Overview
LTC4059EDC#TRMPBF from Analog Devices (formerly Linear Technology) is a 900mA constant-current/constant-voltage linear Li-ion battery charger IC for single-cell 4.2V batteries, featuring thermal regulation, programmable charge current up to 900mA, ±0.6% float voltage accuracy, and integrated power FET-no external MOSFET, sense resistor, or blocking diode required. It targets USB-powered portable electronics including wireless headsets and digital cameras.
For engineers reviewing the LTC4059EDC#TRMPBF datasheet, LTC4059EDC#TRMPBF pinout, LTC4059EDC#TRMPBF application, or LTC4059EDC#TRMPBF equivalent, key selection criteria include its 2mm × 2mm DFN package, 3.75V–8V input range, 10µA shutdown supply current, Li-Ion/Ni-based dual-chemistry support via Li CC pin, and thermal feedback limiting at ~115°C junction temperature.
Technical Context
The LTC4059EDC#TRMPBF implements a three-loop control architecture-constant-current (CA), constant-voltage (VA), and constant-temperature (TA)-with transconductance amplifier TA actively reducing charge current when die temperature approaches 115°C. Its internal P-channel power FET (RON = 800–1200mΩ) enables direct USB charging without external pass components.
Charge current is set by a single resistor (RPROG) from PROG to GND, with IBAT = 1000 × VPROG/RPROG; VPROG is regulated to 1.21V in CC mode. The Li CC pin disables CV mode to enable precision constant-current sourcing for Ni-based battery charging-a function absent in the LTC4059A variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current Range | Programmable up to 900mA via RPROG; enables fast charging of 800mAh Li-ion cells in under 2 hours. |
| Float Voltage Accuracy | 4.2V ±0.6% (4.158V–4.242V); ensures safe, full-state-of-charge without overvoltage stress on cell. |
| Input Voltage Range | 3.75V to 8V; supports direct USB 5V and wall adapters up to 8V without external regulation. |
| Shutdown Supply Current | 10µA max; minimizes system standby power loss when charging is disabled. |
| Junction Temp Limit | Thermal regulation activates at ~115°C; dynamically reduces charge current to prevent overheating on compact PCBs. |
| Package Thermal Resistance | θJA = 60°C/W (with exposed pad soldered); requires PCB ground plane connection for full 900mA capability. |
| Undervoltage Lockout | VCC–VBAT threshold = 100–200mV; prevents charging when input is insufficient, reducing battery drain to <1µA. |
Pinout & Package
6-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (Pin 7, GND). Must be soldered to PCB ground plane for thermal performance. Pin 1 marked with bar; top marking "LAFU".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 7) | Ground reference & thermal path | Exposed pad (Pin 7) is mandatory GND connection; failure to solder degrades θJA to >85°C/W and limits max current to <500mA. |
| Li CC (Pin 2) | Constant-current mode enable | Pulling above 0.92V disables CV regulation, forcing pure CC output-enables NiCd/NiMH charging with fixed current source behavior. |
| BAT (Pin 3) | Charge current output & voltage regulation node | Direct connection to battery anode; internal 4.2V precision divider regulates float voltage; disconnects in shutdown. |
| VCC (Pin 4) | Main power input | Accepts 3.75V–8V; bypass with ≥1µF capacitor; UVLO triggers when VCC falls within 35mV of VBAT. |
| PROG (Pin 5) | Current programming & monitoring | 1.21V reference in CC mode; IBAT = 1000 × VPROG/RPROG; voltage proportional to real-time charge current. |
| EN (Pin 6) | Manual shutdown control | Pulling above 0.92V (with 85mV hysteresis) forces shutdown, reducing ICC to 10µA and IBAT to <1µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power FET | Eliminates need for external MOSFET, sense resistor, or blocking diode-reduces BOM count to two passive components (RPROG + input cap). |
| Thermal regulation loop | Active current reduction at ~115°C junction temp; allows aggressive layout without derating-supports 900mA at 56°C ambient (5V/3.7V). |
| Li CC pin functionality | Enables dual-chemistry operation: Li-ion CV+CC charging or Ni-based constant-current sourcing-no firmware or external logic needed. |
| USB-compliant operation | Meets USB 2.0 power spec: operates from 5V, draws <500mA default, supports programmable current up to 900mA with host negotiation. |
| Low-power shutdown | 10µA VCC supply current and <1µA battery drain in shutdown-critical for long-term storage in portable devices. |
Applications
| Wireless Headsets | Digital Cameras |
|---|---|
Use Scenario: Compact, battery-powered audio device requiring rapid recharge between short usage sessions. IC Role / Device Role / Timing Role: Primary Li-ion charger IC managing full CC/CV cycle, thermal safety, and USB/wall adapter input arbitration. Use Value: 900mA programmable current enables <90-minute recharge of 800mAh battery; 2mm × 2mm DFN saves board space in tight acoustic enclosures. |
Use Scenario: Intermittent high-power imaging device needing reliable charge termination and low standby drain. IC Role / Device Role / Timing Role: Standalone linear charger providing precise 4.2V float voltage and C/10-equivalent termination via PROG pin monitoring. Use Value: ±0.6% voltage accuracy prevents cell degradation during repeated charge cycles; 10µA shutdown current extends shelf life. |
| Portable Medical Sensors | Bluetooth Trackers |
Use Scenario: Wearable health monitor with strict safety and longevity requirements for embedded Li-ion battery. IC Role / Device Role / Timing Role: Safety-critical battery management element enforcing thermal cutoff, UVLO, and accurate voltage regulation. Use Value: Junction temperature limit at 115°C and automatic current rollback prevent thermal runaway; undervoltage lockout avoids deep discharge damage. |
Use Scenario: Small-form-factor asset tracker powered by coin-cell–sized Li-ion, frequently charged via USB port. IC Role / Device Role / Timing Role: USB-native charger IC handling variable input (5V USB or 7.5V adapter) while maintaining consistent charge profile. Use Value: 3.75V–8V input range accommodates both USB and higher-voltage adapters; no external components simplify miniaturized design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4059AEDC#TRMPBF | Replaces Li CC pin with ACPR (open-drain input status indicator); lacks Ni-chemistry constant-current sourcing capability. | Suitable where input presence detection is prioritized over multi-chemistry flexibility; not usable for NiCd/NiMH charging. | Select LTC4059AEDC#TRMPBF only if ACPR status reporting is required and Ni-chemistry charging is unnecessary. |
| LTC4054ES5#TRMPBF | 500mA fixed-current, SOT-23-5 package, no PROG pin or current monitoring; lacks Li CC pin and thermal regulation headroom. | Targeted at cost-sensitive, lower-power devices; cannot support >500mA or thermal-aware high-current designs. | Choose LTC4054ES5#TRMPBF only for sub-500mA applications where board area and BOM simplicity outweigh programmability and thermal margin. |
Compared with LTC4059AEDC#TRMPBF, the LTC4059EDC#TRMPBF provides unique Ni-chemistry charging capability but omits input-status signaling; versus LTC4054ES5#TRMPBF, it delivers 80% higher current, full thermal regulation, and real-time current monitoring-making it suitable for thermally constrained, high-throughput portable systems.
Availability
LTC4059EDC#TRMPBF is available at Aetrix Electronics and suitable for wireless headsets, digital cameras, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed thermal performance in compact form factors.
Supply support for LTC4059EDC#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 precision analog and power management portfolio. Linear pioneered high-performance linear chargers with integrated FETs and thermal intelligence.
The LTC4059EDC#TRMPBF belongs to Linear's standalone Li-ion linear charger family, designed specifically for space-constrained, USB-powered portable electronics demanding robust thermal management and dual-chemistry flexibility without microcontroller intervention.
FAQ
What is the maximum charge current supported by the LTC4059EDC#TRMPBF?
The LTC4059EDC#TRMPBF supports a programmable charge current up to 900mA, set by the value of the external RPROG resistor connected from the PROG pin to GND. At RPROG = 1.33kΩ, the device delivers 900mA; higher resistance values reduce current linearly. This maximum is achievable only with proper thermal management-including soldering the exposed pad to a PCB ground plane.
Does the LTC4059EDC#TRMPBF support charging Nickel-based batteries?
Yes, the LTC4059EDC#TRMPBF supports NiCd/NiMH charging via its Li CC pin (Pin 2). When pulled above 0.92V, the Li CC pin disables constant-voltage regulation and configures the IC as a precision constant-current source. This feature is exclusive to the LTC4059 (not the LTC4059A) and enables direct Ni-chemistry charging without external current-sense circuitry.
How does thermal regulation work in the LTC4059EDC#TRMPBF?
The LTC4059EDC#TRMPBF uses an internal transconductance amplifier (TA) that monitors die temperature and begins reducing charge current when junction temperature approaches ~115°C. This constant-temperature loop operates alongside CC/CV loops, automatically lowering IBAT to maintain safe thermal operation-enabling reliable 900mA charging even in compact enclosures without forced airflow.
What is the purpose of the PROG pin on the LTC4059EDC#TRMPBF?
The PROG pin on the LTC4059EDC#TRMPBF serves dual functions: (1) it sets charge current via RPROG (IBAT = 1000 × 1.21V / RPROG), and (2) it provides real-time current monitoring-VPROG remains at 1.21V in CC mode and scales linearly with actual IBAT in CV mode. This enables gas gauging and charge termination detection without additional components.
Can the LTC4059EDC#TRMPBF be used with USB 2.0 ports?
Yes, the LTC4059EDC#TRMPBF is explicitly designed for USB 2.0 compliance. It operates from 5V input, draws ≤500mA by default, and supports programmable currents up to 900mA when negotiated via host-controlled VCC configuration. Its 3.75V–8V input range also accommodates USB-C PD and wall adapters, making it suitable for dual-input portable systems.
LTC4059EDC#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)
LTC4059EDC#TRMPBF FAQ
1.How can I place an order for LTC4059EDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4059EDC#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 LTC4059EDC#TRMPBF reliable?
The price and inventory of LTC4059EDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4059EDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4059EDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4059EDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4059EDC#TRMPBF?
LTC4059EDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4059EDC#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 LTC4059EDC#TRMPBF?
For technical support, including LTC4059EDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4059EDC#TRMPBF requirements.
6.How does Aetrix verify that LTC4059EDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4059EDC#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 LTC4059EDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4059EDC#TRMPBF?
All LTC4059EDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4059EDC#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 LTC4059EDC#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4059EDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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