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Analog Devices Inc. LTC4001EUF-1#TRPBF
- Part No.:
- LTC4001EUF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC4001EUF-1#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,657
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Product details
Overview
LTC4001EUF-1#TRPBF from Analog Devices (formerly Linear Technology) is a 2A synchronous buck Li-ion battery charger IC designed for 5V wall adapters. It integrates P- and N-channel MOSFETs, current sense, and ±1% 4.1V float voltage regulation. Its 1.5MHz switching frequency, 4mm × 4mm QFN-16 package, and remote battery sensing enable compact, thermally efficient charging in handheld devices operating above 60°C.
For engineers reviewing the LTC4001EUF-1#TRPBF datasheet, LTC4001EUF-1#TRPBF pinout, LTC4001EUF-1#TRPBF application, or LTC4001EUF-1#TRPBF equivalent, key selection criteria include its 4.1V float voltage for high-temperature battery longevity, programmable 2A charge current via PROG pin, integrated short-circuit and overtemperature protection, and thermistor-based temperature-qualified charging with cold/hot fault thresholds.
Technical Context
The LTC4001EUF-1#TRPBF implements a constant-current/constant-voltage charging algorithm using a synchronous buck converter with internal 127mΩ P-MOSFET and 121mΩ N-MOSFET. It features dual-stage charging: 50mA trickle mode below 2.85V, then PWM-controlled 2A fast charge up to 4.1V float voltage.
Charge termination is configurable via TIMER pin (capacitor-based timeout), IDET pin (current-threshold detection), or external EN control. Temperature qualification uses an NTC thermistor connected between NTC and GNDSENS pins, with cold (0°C) and hot (50°C) fault thresholds enforced by comparator hysteresis and digital qualification logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Programmable up to 2A via external resistor on PROG pin; enables full-rate charging of single-cell Li-ion packs. |
| Float Voltage | Fixed 4.1V ±0.5% at BATSENS/GNDSENS; reduces long-term capacity loss and swelling in high-temp storage (>60°C). |
| Switching Frequency | 1.5MHz typical; allows use of small 1.5μH inductor and low-ESR ceramic output capacitors. |
| Input Voltage Range | 4V to 5.5V at PVIN; supports standard 5V USB/wall adapters with undervoltage lockout at 2.82V. |
| Thermal Protection | Junction shutdown at ~160°C; resumes at ~150°C; prevents permanent damage during sustained overload. |
| Package | 16-lead 4mm × 4mm QFN with exposed thermal pad; θJA = 37°C/W enables >2A continuous operation without heatsink. |
| Accuracy | ±1% float voltage tolerance and ±10% timer capacitor accuracy ensure predictable end-of-charge timing and cell voltage compliance. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN, 0.75mm profile, exposed pad (Pin 17) soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery output terminal | Kelvin-sense connection point for battery anode; requires 10μF ceramic capacitor to PGND for ripple suppression. |
| SENSE (2) | Internal current sense node | Connects to inductor's switch-side node; carries full switching current and enables accurate current regulation. |
| PGND (3) | Power ground return | High-current return path for MOSFETs and inductor; must be low-inductance copper pour tied to exposed pad. |
| GNDSENS (4) | Ground sense reference | Kelvin connection to battery cathode; separates power and sense grounds to eliminate IR drop errors in voltage regulation. |
| SW (5) | Switch node | Drain connection of internal P- and N-MOSFETs; high dv/dt node requiring tight layout and minimal trace length. |
| EN (6) | Enable control input | Pull high to disable charger; reduces supply current to <50μA and BAT leakage to <3μA for system-level power management. |
| CHRG (7) | Open-drain status output | Active-low during charge; blinks at 1.5Hz during temperature fault; provides weak 30μA pull-down for end-of-charge indication. |
| PVIN (8) | Main power input | Connects to 4–5.5V source; decoupled with ≥10μF ceramic capacitor; supplies internal power devices. |
| VINSENSE (9) | Input voltage sense | Reference for UVLO, overvoltage, and sleep-mode entry; ties directly to PVIN decoupling capacitor for noise immunity. |
| FAULT (10) | Fault status output | Logic-high indicates shorted battery or NTC temperature fault; drives microcontroller interrupt or LED indicator. |
| NTC (11) | Thermistor interface | Accepts voltage divider from NTC thermistor and bias resistor; enables automatic charge suspension outside 0°C–50°C range. |
| PROG (12) | Charge current programming | 1.213V reference input; sets IBAT = 915 × IPROG; 549Ω yields ~2A; supports DAC-based current control. |
| IDET (13) | End-of-charge threshold | 1.213V reference input; sets IDET = 91.5 × IIDET; 549Ω yields ~200mA (C/10 for 2Ah cell); enables precise termination. |
| SS (14) | Soft-start/compensation | Controls ramp rate of PWM duty cycle; 0.1μF yields ~10ms soft-start; also compensates both current and voltage control loops. |
| TIMER (15) | Charge timeout setting | Capacitor-to-GNDSENS sets total charge time: CTIMER = Time(hrs) × 0.0733μF; connect to IDET to disable timeout. |
| BATSENS (16) | Battery voltage sense | Internal 4.1V divider reference; connects to battery anode for accurate float voltage regulation independent of trace resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates need for external high-side/low-side switches, reducing BOM count and PCB area in space-constrained designs. |
| 4.1V precision float voltage | Optimized for extended life in high-temperature environments (>60°C), minimizing electrolyte decomposition and CID activation in cylindrical cells. |
| Remote Kelvin sensing (BAT/BATSENS + PGND/GNDSENS) | Compensates for PCB trace resistance, ensuring ±1% voltage regulation accuracy at battery terminals under load. |
| Programmable charge termination | Supports three independent methods-timer-based, current-threshold (IDET), or external EN control-for flexible system integration. |
| NTC-based temperature qualification | Enables safe charging only within 0°C–50°C window; includes 3°C hysteresis per comparator to prevent oscillation near trip points. |
Applications
| Smartphones | Digital Cameras |
|---|---|
Use Scenario: Fast charging of single-cell Li-ion batteries in slim-profile mobile handsets with thermal constraints. IC Role / Device Role / Timing Role: Primary battery charger IC managing CC/CV profile, thermal safety, and status signaling to baseband processor. Use Value: 4.1V float voltage extends battery cycle life by 20–30% when stored at elevated ambient temperatures common in pocket or car-mount use. | Use Scenario: High-current charging of Li-ion packs in DSLR/mirrorless cameras requiring rapid turnaround between shoots. IC Role / Device Role / Timing Role: Synchronous buck charger delivering up to 2A while maintaining <1.25W total dissipation at 4V battery voltage. Use Value: Integrated MOSFETs and 1.5MHz operation allow compact 1.5μH inductor and minimal footprint, critical for camera body size constraints. |
| Charging Docks | Handheld Computers |
Use Scenario: Multi-device charging station powering tablets, earbuds, and styluses from shared 5V rail. IC Role / Device Role / Timing Role: Independent charger channel with automatic recharge and trickle-to-fast transition logic. Use Value: Programmable PROG and IDET resistors enable consistent C/10 termination across diverse battery capacities without firmware changes. | Use Scenario: Industrial handhelds used in warehouses or field service with wide ambient temperature ranges (–40°C to 85°C). IC Role / Device Role / Timing Role: Battery management IC providing overvoltage, overtemperature, and short-circuit protection per JEDEC JESD22-A108. Use Value: Fault pin assertion and CHRG blinking provide unambiguous hardware-level alerts to MCU, enabling fail-safe shutdown before thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2V float voltage; no NTC input; requires external MOSFETs; 1.5A max charge current. | Suitable for room-temperature consumer devices where 4.2V initial capacity is prioritized over long-term retention. | Select BQ24075RGTR if higher initial capacity is required and thermal derating is not needed. |
| MP2617GQ-Z | 4.2V float voltage; integrated ADC for battery telemetry; 2.5A max current; supports USB-IF BC1.2 detection. | Targets USB-powered portable electronics needing protocol-aware input sourcing and voltage telemetry. | Select MP2617GQ-Z when USB compatibility and real-time battery parameter monitoring are essential. |
Compared with BQ24075RGTR and MP2617GQ-Z, the LTC4001EUF-1#TRPBF uniquely delivers 4.1V float voltage with ±0.5% accuracy, integrated synchronous FETs, and dedicated NTC fault handling - making it optimal for high-reliability, thermally stressed Li-ion applications where battery longevity outweighs peak capacity.
Availability
LTC4001EUF-1#TRPBF is available at Aetrix Electronics and suitable for smartphone battery management, industrial handheld computers, digital camera charging systems, and medical portable devices requiring stable component supply and long-lifecycle support.
Supply support for LTC4001EUF-1#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC4001EUF-1#TRPBF belongs to ADI's Linear Technology battery management product line, engineered specifically for compact, thermally robust, single-cell Li-ion charging in portable electronics operating under elevated ambient conditions.
FAQ
What is the primary function of the LTC4001EUF-1#TRPBF?
The LTC4001EUF-1#TRPBF is a 2A synchronous buck Li-ion battery charger IC that delivers constant-current/constant-voltage charging with integrated MOSFETs, 4.1V float voltage regulation, and temperature-qualified operation. It manages full charging cycles-including trickle, fast, and top-off phases-while providing fault detection and status signaling for embedded systems.
Why does the LTC4001EUF-1#TRPBF use a 4.1V float voltage instead of the standard 4.2V?
The LTC4001EUF-1#TRPBF uses a fixed 4.1V float voltage to improve long-term battery capacity retention and mechanical stability-especially when operated or stored above 60°C. This reduced voltage trades ~5% initial capacity for significantly lower electrolyte decomposition, reduced swelling in prismatic/polymer cells, and avoidance of open CID in cylindrical cells.
How is charge current programmed on the LTC4001EUF-1#TRPBF?
Charge current on the LTC4001EUF-1#TRPBF is programmed via an external resistor (RPROG) from the PROG pin to GNDSENS. With a nominal PROG pin voltage of 1.213V, IBAT ≈ 915 × (1.213V / RPROG). For example, a 549Ω resistor sets IBAT ≈ 2A. The PROG pin also accepts current-source DAC inputs for dynamic current control.
What protection features does the LTC4001EUF-1#TRPBF include?
The LTC4001EUF-1#TRPBF includes short-circuit detection (enters 50mA trickle mode on battery short), overvoltage protection (shuts down if VBAT exceeds float by ~5%), chip overtemperature shutdown (~160°C), NTC-based cold/hot temperature fault detection (0°C/50°C thresholds), and input undervoltage lockout (2.82V with 100mV hysteresis).
Can the LTC4001EUF-1#TRPBF be used without an NTC thermistor?
Yes-the LTC4001EUF-1#TRPBF can operate without an NTC thermistor by connecting the NTC pin directly to GNDSENS. This disables all temperature qualification functions, allowing uninterrupted charging. However, this configuration forfeits thermal safety margins and is not recommended for products requiring IEC 62368-1 or UL 2054 compliance in high-ambient environments.
LTC4001EUF-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer
- Fault Protection:
- Over Voltage, Short Circuit
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LTC4001EUF-1#TRPBF FAQ
1.How can I place an order for LTC4001EUF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4001EUF-1#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 LTC4001EUF-1#TRPBF reliable?
The price and inventory of LTC4001EUF-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4001EUF-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4001EUF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4001EUF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4001EUF-1#TRPBF?
LTC4001EUF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4001EUF-1#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 LTC4001EUF-1#TRPBF?
For technical support, including LTC4001EUF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4001EUF-1#TRPBF requirements.
6.How does Aetrix verify that LTC4001EUF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4001EUF-1#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 LTC4001EUF-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4001EUF-1#TRPBF?
All LTC4001EUF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4001EUF-1#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 LTC4001EUF-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4001EUF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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