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Analog Devices Inc. LTC4000EUFD#TRPBF
- Part No.:
- LTC4000EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4000EUFD#TRPBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHATE 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,918
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Product details
Overview
LTC4000EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, high-performance battery charge controller IC that converts externally compensated DC/DC converters into full-featured Li-ion/LiFePO₄ chargers. It supports 3V–60V input and output ranges, delivers ±1% programmable input/charge current limits, ±0.25% accurate float voltage regulation, and enables PowerPath™ instant-on operation with heavily discharged batteries.
For engineers reviewing the LTC4000EUFD#TRPBF datasheet, LTC4000EUFD#TRPBF pinout, LTC4000EUFD#TRPBF application, or LTC4000EUFD#TRPBF equivalent, key selection criteria include its dual ideal diode control (input and battery), NTC-based temperature qualified charging, C/X or timer-based termination, and compatibility with buck, boost, or buck-boost converter topologies for scalable high-power battery systems.
Technical Context
The LTC4000EUFD#TRPBF implements four independent regulation loops-input current, battery charge current, battery float voltage, and output voltage-each feeding into a shared high-impedance ITH control node that interfaces with external DC/DC converter compensation networks. Its PowerPath architecture uses two external PFETs: one for low-loss reverse-current blocking at the input (IID→CSP), another for bidirectional battery power routing (BAT↔CSN) enabling seamless switchover and instant-on behavior.
It integrates precision current sensing with 20× gain and <±300 µV offset, supports temperature qualification via NTC thermistor on the BIAS-biased NTC pin, and provides status signaling through open-drain CHRG/FLT pins and reset control via VM/RST. All critical thresholds-including VOUT(INST_ON) at 82–90% of VBFB_REG and VRECHRG(RISE) at 96.9–98.3%-are specified over –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial, telecom, and portable power inputs without pre-regulation. |
| Battery Float Voltage Accuracy | ±0.25% - ensures precise cell voltage control for LiFePO₄ (e.g., 10.8V for 3-cell) and Li-ion chemistries. |
| Charge Current Limit Accuracy | ±1% - enables reliable high-current charging up to 10A+ when paired with appropriate sense resistors and external FETs. |
| PowerPath Instant-On Threshold | 82–90% of float voltage - guarantees immediate system power delivery even from deeply discharged batteries (e.g., <7V for 10.8V pack). |
| NTC Temperature Monitoring | VNTC(COLD): 73–77% VBIAS; VNTC(HOT): 33–37% VBIAS - provides safe, hysteresis-controlled thermal qualification for charging. |
| Package Type | 28-lead 4mm × 5mm QFN (UFD) - low-profile, thermally enhanced package with exposed pad soldered to GND for θJC = 4°C/W. |
| Operating Junction Temp | –40°C to 125°C - rated for harsh industrial and automotive under-hood environments. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN (UFD), exposed pad (Pin 29) connected to GND for thermal and electrical integrity. Pin pitch: 0.5mm. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 27) | Primary input supply rail | Accepts 3V–60V DC; powers internal circuitry and drives IGATE for input ideal diode control. |
| BAT (Pin 17) | Battery anode connection | Connects to positive terminal of battery pack; source for BGATE-driven battery PMOS. |
| CSP / CSN (Pins 20 / 19) | Charge current sense differential inputs | Measure voltage across external sense resistor (RCS); regulate charge current to 1/20 × VCL voltage. |
| IGATE (Pin 22) | Input PFET gate driver | Drives external PMOS cathode-to-anode (CSP→IID) for low-loss reverse-blocking and load sharing. |
| BGATE (Pin 18) | Battery PFET gate driver | Controls bidirectional battery path: ideal diode discharge (BAT→CSN) or regulated charging (CSN→BAT). |
| ITH (Pin 24) | Control voltage interface | High-impedance node sinking up to 1mA; connects to DC/DC converter compensation network for loop stability. |
| VM (Pin 1) | Voltage monitor input | 1.193V threshold comparator input; triggers RST low during undervoltage events on monitored rail. |
| CHRG / FLT (Pins 12 / 11) | Open-drain status outputs | CHRG = active-low during charge cycle; FLT = low on over/under-temp or bad battery detection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual ideal diode control | Independent IGATE and BGATE drivers enable lossless input reverse-blocking and battery switchover with <20mV forward drop. |
| Instant-on PowerPath | Regulates BGATE to maintain ≥86% of float voltage at OFB during deep discharge, delivering valid system VOUT before battery reaches full charge. |
| Programmable termination | Supports both C/X ratio (e.g., C/10 trickle) and timer-based (2.3–3.5h with 0.1µF CTMR) charge cutoff with hysteresis. |
| Temperature-qualified charging | NTC input with cold/hot thresholds (73–77% / 33–37% VBIAS) and 5% hysteresis prevents charging outside safe thermal window. |
| Precision current sensing | 20× gain amplifier with ±300 µV offset and 3–60V common-mode range enables accurate high-current measurement using low-value sense resistors. |
Applications
| Portable Medical Defibrillator | Industrial Handheld Analyzer |
|---|---|
|
Use Scenario: Field-deployable device requiring instant power-up from depleted LiFePO₄ packs and reliable multi-hour runtime. IC Role / Device Role / Timing Role: LTC4000EUFD#TRPBF acts as battery charge manager and PowerPath arbiter, coordinating external buck converter and dual PFETs. Use Value: Enables immediate system boot (<100ms) from batteries as low as 6.5V while maintaining ±0.25% float accuracy for cell longevity. |
Use Scenario: Ruggedized test instrument operating in variable ambient temperatures (-20°C to 60°C) with hot-swap battery capability. IC Role / Device Role / Timing Role: LTC4000EUFD#TRPBF manages charge termination, monitors NTC thermistor, and controls input/battery path priority. Use Value: Prevents charging below -10°C or above 45°C using factory-calibrated NTC thresholds, ensuring compliance with IEC 62133. |
| Telecom Remote Radio Unit | Mobile Robotics Charging Dock |
|
Use Scenario: Outdoor base station powered by 48V DC input and backup Li-ion battery, requiring seamless failover and remote monitoring. IC Role / Device Role / Timing Role: LTC4000EUFD#TRPBF regulates 48V→12V buck converter, senses input current for OCP, and signals fault status via CHRG/FLT. Use Value: Delivers ±1% input current limit accuracy and open-drain status outputs compatible with PLC-level supervision logic. |
Use Scenario: Autonomous robot docking station that charges multiple 14.4V Li-ion packs simultaneously with thermal safety. IC Role / Device Role / Timing Role: LTC4000EUFD#TRPBF configures per-pack charge profiles via individual CL/IL resistors and NTC networks. Use Value: Supports parallel charging with independent current limits and temperature qualification per battery string. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24610RTWR | Lower max input voltage (28V vs 60V); no instant-on PowerPath; integrated MOSFET drivers limited to 3A continuous. | Suitable for single-cell Li-ion USB-powered devices but lacks dual ideal diode control and wide-VIN capability. | Select LTC4000EUFD#TRPBF when >30V input, >5A charge current, or seamless battery/system power arbitration is required. |
| MP2759GQZ-0000-P | Integrated buck charger (no external converter needed); fixed 4.2V/4.35V float; no NTC input or programmable termination modes. | Targeted at cost-sensitive consumer electronics with standardized Li-ion cells-not configurable for LiFePO₄ or custom profiles. | Choose LTC4000EUFD#TRPBF for flexible chemistry support (LiFePO₄/Li-ion), external topology freedom, and industrial-grade thermal management. |
Compared with BQ24610RTWR and MP2759GQZ-0000-P, the LTC4000EUFD#TRPBF uniquely combines 60V input tolerance, dual ideal diode PowerPath, instant-on regulation, and full programmability of float voltage, current limits, and termination-making it optimal for high-reliability, multi-chemistry, high-power embedded battery systems.
Availability
LTC4000EUFD#TRPBF is available at Aetrix Electronics and suitable for industrial battery backup systems, portable medical instrumentation, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC4000EUFD#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC4000EUFD#TRPBF belongs to Linear's high-voltage battery management controller family, designed specifically to add intelligent charging, PowerPath arbitration, and thermal safety to existing DC/DC converter designs without redesigning power stages.
FAQ
What is the primary function of the LTC4000EUFD#TRPBF in a battery-powered system?
The LTC4000EUFD#TRPBF serves as a high-voltage battery charge controller that transforms externally compensated DC/DC converters into full-featured chargers. It manages input current limiting, battery charge current regulation, precise float voltage control, temperature-qualified charging via NTC, and PowerPath™ arbitration between input and battery sources. The LTC4000EUFD#TRPBF does not include power switches-it relies on external PFETs and a separate converter stage for power delivery.
Does the LTC4000EUFD#TRPBF support LiFePO₄ battery chemistry, and how is float voltage configured?
Yes, the LTC4000EUFD#TRPBF fully supports LiFePO₄ chemistry through its programmable float voltage feature. Float voltage is set by a resistor divider from BAT to FBG, referenced to the internal 1.136V BFB regulator. For a 3-cell LiFePO₄ pack (10.8V nominal), typical configuration yields 10.8V ±0.25% accuracy. The LTC4000EUFD#TRPBF's ±0.25% BFB voltage tolerance and low-drift design ensure long-term cell voltage stability critical for LiFePO₄ longevity.
How does the instant-on feature of the LTC4000EUFD#TRPBF operate during deep battery discharge?
The LTC4000EUFD#TRPBF activates instant-on when the OFB feedback voltage falls below VOUT(INST_ON) - defined as 82–90% of the programmed float voltage (e.g., ~8.9V for a 10.8V pack). In this state, BGATE regulates to hold OFB at ~0.974V, producing a valid output voltage (e.g., 12V) immediately. This occurs without waiting for battery recharge, enabling downstream systems to power up from batteries as low as 6.5V. The LTC4000EUFD#TRPBF sustains this until OFB rises above threshold, then transitions to normal charging.
Can the LTC4000EUFD#TRPBF be used with boost or buck-boost converters, or is it limited to buck topologies?
The LTC4000EUFD#TRPBF is topology-agnostic and works with buck, boost, buck-boost, and flyback converters-as long as the converter includes a compensation node compatible with the LTC4000EUFD#TRPBF's ITH pin interface. Its control architecture injects error correction into the converter's feedback loop via ITH, regardless of topology. Application Note 128 demonstrates validated boost and buck-boost implementations using the LTC4000EUFD#TRPBF with LT3757 and LT3782 controllers.
What are the thermal performance characteristics of the LTC4000EUFD#TRPBF in the UFD QFN package?
The LTC4000EUFD#TRPBF in the 4mm × 5mm QFN (UFD) package has θJA = 43°C/W and θJC = 4°C/W when the exposed pad (Pin 29) is soldered to a minimum 1-in² PCB copper area. At 125°C maximum junction temperature and 25°C ambient, it can dissipate up to ~2.3W continuously. Thermal design must prioritize GND plane connectivity to the exposed pad; insufficient soldering increases θJC by >5× and risks thermal shutdown. The LTC4000EUFD#TRPBF includes internal thermal foldback to protect against sustained overload.
LTC4000EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Iron Phosphate
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Reverse Current
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 60V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC4000EUFD#TRPBF FAQ
1.How can I place an order for LTC4000EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000EUFD#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 LTC4000EUFD#TRPBF reliable?
The price and inventory of LTC4000EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4000EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4000EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000EUFD#TRPBF?
LTC4000EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000EUFD#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 LTC4000EUFD#TRPBF?
For technical support, including LTC4000EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC4000EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4000EUFD#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 LTC4000EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4000EUFD#TRPBF?
All LTC4000EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000EUFD#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 LTC4000EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4000EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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