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Analog Devices Inc. LTC4059EDC#TRPBF
- Part No.:
- LTC4059EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC4059EDC#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,752
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Product details
Overview
LTC4059EDC#TRPBF from Analog Devices (formerly Linear Technology) is a 900mA linear Li-ion battery charger IC with thermal regulation, constant-current/constant-voltage operation, and integrated power FET - designed for USB-powered portable devices. It delivers precise 4.2V ±0.6% float voltage, supports programmable charge current up to 900mA via single PROG resistor, and operates from 3.75V to 8V input supply. Used in cellular phones and wireless PDAs where compact size and thermal safety are critical.
For engineers reviewing the LTC4059EDC#TRPBF datasheet, LTC4059EDC#TRPBF pinout, LTC4059EDC#TRPBF application, or LTC4059EDC#TRPBF equivalent, key selection criteria include its 2mm × 2mm DFN package, absence of external MOSFET/sense resistor/blocking diode, thermal feedback limiting at ~115°C, Li CC pin enabling Ni-based battery charging, and shutdown current of 10µA.
Technical Context
The LTC4059EDC#TRPBF implements a three-loop control architecture: constant-current (CA), constant-voltage (VA), and constant-temperature (TA). The TA loop activates when junction temperature approaches 115°C, reducing charge current to maintain thermal safety without external intervention. Its internal P-channel power FET (RON = 800–1200 mΩ) eliminates need for external pass device.
Charge termination is managed via EN pin (manual shutdown threshold: 0.3–1.2 V) or input removal; PROG pin serves dual role - programming current (IBAT = 1000 × VPROG/RPROG) and monitoring real-time current. The Li CC pin disables voltage regulation to enable constant-current source mode for Ni-based batteries - a feature exclusive to LTC4059 (not LTC4059A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.2V ±0.6% - ensures safe full-charge state for standard single-cell Li-ion without overvoltage risk. |
| Max Charge Current | Programmable up to 900mA - set by single external resistor on PROG pin; enables fast charging within USB power limits. |
| Input Voltage Range | 3.75V to 8V - compatible with USB 5V and wall adapters; includes undervoltage lockout (100–200mV hysteresis). |
| Thermal Regulation Threshold | Junction temperature limit ~115°C - automatically reduces charge current to prevent overheating on PCBs with limited thermal mass. |
| Shutdown Supply Current | 10µA typical - minimizes system standby power loss when EN pin is asserted. |
| Battery Drain Current (Shutdown) | <1µA - preserves battery capacity during long idle periods in portable equipment. |
| Package | 6-lead 2mm × 2mm DFN (DC6), 0.75mm height - ultra-compact footprint ideal for space-constrained handhelds. |
Pinout & Package
Package: 6-lead plastic DFN (2mm × 2mm), exposed pad (Pin 7) tied to GND and required to be soldered to PCB ground plane for thermal performance (θJA ≈ 60°C/W with proper layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 7) | Ground reference and thermal pad | Exposed pad must be soldered to PCB ground plane; failure causes >100% increase in thermal resistance. |
| Li CC (Pin 2) | Constant-current mode enable/disable | Pulling above 0.92V disables CV mode, forcing pure CC output - essential for NiCd/NiMH charging. |
| BAT (Pin 3) | Battery charge output and voltage sense | Delivers regulated current; internal 4.2V divider sets float voltage; disconnects in shutdown to minimize drain. |
| VCC (Pin 4) | Main input supply | Accepts 3.75–8V; bypass with ≥1µF capacitor; UVLO triggers when VCC − VBAT < 150mV. |
| PROG (Pin 5) | Current programming and monitoring | Sets IBAT = 1000 × VPROG/RPROG; VPROG = 1.21V in CC mode - enables real-time current measurement. |
| EN (Pin 6) | Enable/shutdown control | Pulling above 0.92V forces shutdown (10µA ICC, <1µA IBAT); default-active when grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel power FET | Eliminates need for external MOSFET, sense resistor, or blocking diode - reduces BOM count and PCB area. |
| Thermal feedback regulation | Automatically throttles charge current above ~115°C junction temperature - enables robust operation without heatsinks. |
| Li CC pin functionality | Converts IC into precision constant-current source (up to 900mA) for Ni-based battery chemistries - no firmware or external logic required. |
| USB-compliant operation | Operates directly from 5V USB port with <500mA draw capability; supports wall adapter input up to 8V. |
| Low-power shutdown mode | 10µA supply current and <1µA battery drain - extends shelf life and standby time in always-on portable systems. |
Applications
| Smartphone Battery Charging | Wireless Headset Power Management |
|---|---|
Use Scenario: Charging single-cell Li-ion battery in compact smartphone with USB input and thermal constraints. IC Role / Device Role / Timing Role: Primary linear charger IC managing CC/CV profile, thermal foldback, and USB compliance. Use Value: Enables 900mA fast charge without external components while maintaining die temperature ≤115°C under worst-case ambient conditions. | Use Scenario: Powering and charging Li-ion battery in Bluetooth headset with strict size and quiescent current requirements. IC Role / Device Role / Timing Role: Standalone battery charger providing low-quiescent shutdown (10µA) and automatic input detection. Use Value: Extends battery runtime between charges and eliminates need for discrete enable circuitry or voltage supervisors. |
| Digital Camera Energy System | Portable Medical Monitor |
Use Scenario: Recharging Li-ion pack in handheld digital camera with intermittent high-current bursts during image capture. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with thermal regulation to sustain charge rate during burst usage. Use Value: Prevents thermal shutdown during rapid photo sequences by dynamically scaling charge current based on die temperature. | Use Scenario: Reliable battery charging in portable ECG monitor requiring medical-grade safety and low leakage. IC Role / Device Role / Timing Role: Safety-critical Li-ion charger with precise 4.2V ±0.6% regulation and <1µA shutdown drain. Use Value: Ensures battery longevity and avoids false low-battery warnings due to excessive self-discharge in standby mode. |
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 |
|---|---|---|---|
| LTC4054ES5#TRMPBF | Lower max charge current (400mA), SOT-23-5 package, no Li CC pin, no thermal regulation | Targeted at ultra-low-power wearables; lacks Ni-battery support and thermal foldback | Select when board space is extremely limited and thermal headroom is ample; not suitable for 900mA or Ni-chemistry use cases. |
| LTC4058EDD#TRPBF | 950mA max current, 3mm × 3mm DFN, includes C/10 charge termination, no Li CC pin | Designed for USB-compatible charging only; lacks constant-current source mode for Ni batteries | Prefer when higher current and USB compliance are primary needs, but Ni-battery charging is unnecessary. |
Compared with LTC4054ES5#TRMPBF and LTC4058EDD#TRPBF, the LTC4059EDC#TRPBF uniquely combines 900mA programmability, thermal regulation, and Li CC pin-enabled Ni-battery charging in a 2mm × 2mm footprint - making it optimal for multi-chemistry, thermally constrained portable designs.
Availability
LTC4059EDC#TRPBF is available at Aetrix Electronics and suitable for smartphone battery charging, wireless headset power management, and portable medical monitor applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC4059EDC#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 and maintains its high-performance analog IC portfolio. Linear pioneered precision power management solutions for demanding portable applications.
The LTC4059EDC#TRPBF belongs to Linear's standalone Li-ion linear charger family, engineered specifically for USB-powered portable electronics where minimal external components, thermal safety, and multi-chemistry flexibility are critical design requirements.
FAQ
What is the function of the Li CC pin on the LTC4059EDC#TRPBF?
The Li CC pin on the LTC4059EDC#TRPBF disables constant-voltage regulation when pulled above 0.92V, converting the IC into a precision constant-current source - enabling direct charging of NiCd/NiMH batteries. This feature is exclusive to the LTC4059 (not present on LTC4059A variants) and requires no external circuitry. The LTC4059EDC#TRPBF uses this pin to deliver up to 900mA CC output with tight current accuracy.
Does the LTC4059EDC#TRPBF require external components for basic operation?
No, the LTC4059EDC#TRPBF requires only two external components for full operation: a single resistor from PROG to GND to set charge current, and a 1µF capacitor from VCC to GND for input bypassing. It integrates the power FET, voltage reference, and thermal regulation circuitry - eliminating need for external MOSFETs, sense resistors, or blocking diodes. This minimizes BOM cost and PCB area in designs using the LTC4059EDC#TRPBF.
How does thermal regulation work in the LTC4059EDC#TRPBF?
The LTC4059EDC#TRPBF 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 independently of input voltage or battery state, ensuring safe operation even under high ambient temperatures or poor PCB thermal design. The LTC4059EDC#TRPBF maintains this behavior without external components or configuration.
What is the maximum charge current achievable with the LTC4059EDC#TRPBF?
The LTC4059EDC#TRPBF supports programmable charge current up to 900mA, set by the value of the external resistor connected from the PROG pin to GND using the formula IBAT = 1000 × VPROG/RPROG (where VPROG = 1.21V in CC mode). At 900mA, the LTC4059EDC#TRPBF delivers full current only when thermal conditions permit - otherwise it folds back automatically to maintain ~115°C junction temperature.
Is the LTC4059EDC#TRPBF compatible with USB 2.0 power specifications?
Yes, the LTC4059EDC#TRPBF is explicitly designed for USB 2.0 compliance: it operates from 5V input, draws ≤500mA in standard USB mode, and includes undervoltage lockout to prevent backfeed. Its 2mm × 2mm DFN package and zero-external-FET architecture meet USB portability and size constraints. The LTC4059EDC#TRPBF also supports higher-current wall adapters (up to 8V) while remaining USB-compatible in dual-input configurations.
LTC4059EDC#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC4059EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4059EDC#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 LTC4059EDC#TRPBF reliable?
The price and inventory of LTC4059EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4059EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4059EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4059EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4059EDC#TRPBF?
LTC4059EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4059EDC#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 LTC4059EDC#TRPBF?
For technical support, including LTC4059EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4059EDC#TRPBF requirements.
6.How does Aetrix verify that LTC4059EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4059EDC#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 LTC4059EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4059EDC#TRPBF?
All LTC4059EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4059EDC#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 LTC4059EDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC4059EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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