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Analog Devices Inc. LTC4000IUFD#PBF
- Part No.:
- LTC4000IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4000IUFD#PBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHATE 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,101
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Product details
Overview
LTC4000IUFD#PBF 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, delivers ±1% programmable input/charge current limits, ±0.25% accurate float voltage regulation, and enables PowerPath™ instant-on operation with deeply discharged batteries.
For engineers reviewing the LTC4000IUFD#PBF datasheet, LTC4000IUFD#PBF pinout, LTC4000IUFD#PBF application, or LTC4000IUFD#PBF equivalent, key selection considerations include its dual ideal diode control (input and battery), NTC-based temperature qualification, C/X or timer-based charge termination, and compatibility with buck, boost, or flyback topologies for high-power portable and industrial battery systems.
Technical Context
The LTC4000IUFD#PBF 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. Its PowerPath architecture uses two external PFETs: one for input reverse-blocking and load sharing, another for battery discharge/charge path control and instant-on voltage regulation.
Charge termination is configurable via CX pin (C/X ratio) or TMR pin (timer-based), with automatic recharge triggered at 97.6% of float voltage and low-battery detection at 68% of float voltage. Temperature qualification uses an NTC thermistor referenced to the 2.9V BIAS regulator, with cold/hot thresholds set at 75%/35% of BIAS voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range adapters, solar inputs, and industrial power rails without pre-regulation. |
| Battery Float Voltage Accuracy | ±0.25% - ensures precise cell voltage control critical for LiFePO₄ longevity and safety compliance. |
| Current Sense Gain | 20 V/V - enables low-loss, high-current sensing with ≤50mV sense voltage, reducing power loss in ≥10A applications. |
| PowerPath Instant-On Threshold | 86% of float voltage - guarantees immediate system power delivery even when battery is below 3V per cell. |
| NTC Temperature Thresholds | Cold: 75% BIAS, Hot: 35% BIAS - provides robust thermal qualification across –40°C to +85°C ambient with 5% hysteresis. |
| Operating Junction Temp | –40°C to +125°C - rated for harsh industrial and automotive under-hood environments. |
| Package | 28-lead 4mm × 5mm QFN - low-profile, thermally enhanced package with exposed pad for 4°C/W θJC. |
Pinout & Package
Package: 28-lead plastic QFN (UFD), 4mm × 5mm, exposed thermal pad (Pin 29 = GND). Pin pitch: 0.5mm. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN, CLN | Input supply and current sense negative | Accepts 3V–60V input; CLN forms differential pair with IN for ±1% input current regulation. |
| CSP, CSN | Battery charge current sense positive/negative | Differential inputs for battery current sensing; regulate to 1/20× CL voltage (≤50mV full-scale). |
| BAT, BGATE | Battery anode and PMOS gate drive | BAT connects to pack anode; BGATE drives external PFET to enable PowerPath discharge or instant-on regulation. |
| IID, IGATE | Input ideal diode anode and gate drive | IID is input anode; IGATE drives external PFET for low-loss reverse blocking and input load sharing. |
| BFB, OFB, FBG | Battery/output feedback and feedback ground | BFB sets float voltage (1.136V ref); OFB sets output voltage (1.193V ref); FBG provides grounded return for both dividers. |
| ITH, CC | Control voltage and converter compensation | ITH sinks up to 1mA to regulate all loops; CC connects R-C network to ITH for stable DC/DC loop compensation. |
| NTC, BIAS | Thermistor input and 2.9V bias reference | BIAS supplies 2.9V ±10% at ≤5mA; NTC reads thermistor divider to suspend charging outside safe temp range. |
Key Features
| Feature | Design Value |
|---|---|
| Intelligent PowerPath Control | Two independent PFET drivers enable seamless switchover between input and battery, plus instant-on output regulation during deep discharge recovery. |
| Programmable Charge Termination | Supports either C/X ratio (e.g., C/10 trickle) or timer-based cutoff (2.3–3.5h with 0.1µF capacitor), with bad battery detection timed at 4× termination duration. |
| Precision Current Sensing | 20× gain amplifier with ±300µV offset allows use of ultra-low-value sense resistors (e.g., 5mΩ), minimizing conduction loss in high-current designs. |
| Temperature-Qualified Charging | NTC interface with programmable cold/hot thresholds and hysteresis ensures charging only within validated thermal envelope, meeting IEC 62133 requirements. |
| Robust Status Monitoring | Dedicated open-drain CHRG and FLT pins provide real-time charge state and fault indication (overtemp, low battery, shorted cell) without MCU polling. |
Applications
| Medical Portable Defibrillator | Industrial Handheld Terminal |
|---|---|
Use Scenario: Field-deployed device requiring immediate power-up from a 3-cell LiFePO₄ pack at <2.5V/cell after long storage. IC Role / Device Role / Timing Role: LTC4000IUFD#PBF acts as battery management controller, enabling instant-on output regulation while simultaneously conditioning the pack via C/10 trickle charge. Use Value: Eliminates boot delay and user frustration; extends usable runtime by recovering deeply discharged cells without manual pre-charge. | Use Scenario: Ruggedized terminal operating on AC adapter or hot-swappable battery in warehouse logistics. IC Role / Device Role / Timing Role: LTC4000IUFD#PBF manages dual-path power routing: prioritizing adapter input while maintaining battery readiness, with seamless transition during adapter removal. Use Value: Prevents system reset during battery swap; sustains real-time data logging and wireless comms without interruption. |
| High-Power Test Equipment | Grid-Tied Energy Storage Gateway |
Use Scenario: Benchtop analyzer drawing >8A from 24V LiFePO₄ pack while accepting 48V DC input for concurrent charging. IC Role / Device Role / Timing Role: LTC4000IUFD#PBF controls external Si7135DP PFETs to isolate input/battery paths, regulate 10A charge current, and maintain stable 12V output under dynamic load. Use Value: Enables simultaneous high-power operation and fast recharging without thermal throttling or voltage droop. | Use Scenario: Residential energy gateway managing bidirectional power flow between PV inverter, grid, and 48V battery stack. IC Role / Device Role / Timing Role: LTC4000IUFD#PBF serves as front-end charger controller for auxiliary 12V system, regulating float voltage to ±0.25% and monitoring pack health via NTC and voltage thresholds. Use Value: Ensures reliable backup power for communication and control circuits, even during extended grid outages with degraded battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24650RGER | Fixed 20V max input; no input ideal diode control; single-path PowerPath; ±0.5% float accuracy. | Lacks instant-on capability and independent input/battery path control; limited to lower-voltage 2–4 cell Li-ion. | Choose for cost-sensitive, lower-power (<5A) Li-ion applications where wide input range and dual ideal diodes are unnecessary. |
| MP2759GQZ | Integrated MOSFETs; 36V max input; no NTC input; ±0.75% float accuracy; no external DC/DC interface. | Self-contained solution for compact designs; unsuitable for >36V inputs or systems requiring external topology flexibility. | Choose when board space is constrained and fixed-buck topology suffices; avoid when interfacing with custom boost/flyback converters or needing NTC qualification. |
Compared with BQ24650RGER and MP2759GQZ, the LTC4000IUFD#PBF offers superior voltage range (3–60V), higher precision (±0.25% float), true dual ideal diode control, and direct ITH/CC interface for arbitrary DC/DC topologies-making it uniquely suited for high-reliability, high-power, and architecturally flexible battery systems.
Availability
LTC4000IUFD#PBF is available at Aetrix Electronics and suitable for high-power portable instruments, industrial battery-equipped devices, and notebook/subnotebook computers requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +125°C.
Supply support for LTC4000IUFD#PBF 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 legacy of high-performance analog, mixed-signal, and power management ICs with rigorous testing and automotive-grade reliability.
The LTC4000 product line was designed specifically for high-voltage, high-current battery charging systems requiring external DC/DC converter integration, intelligent PowerPath control, and precision regulation across demanding industrial and portable applications.
FAQ
What is the primary function of the LTC4000IUFD#PBF in a battery-powered system?
The LTC4000IUFD#PBF functions as a high-voltage battery charge controller that transforms externally compensated DC/DC converters into full-featured chargers. It manages input current, battery charge current, float voltage, and output voltage regulation while enabling PowerPath control for seamless input/battery switchover and instant-on operation. The LTC4000IUFD#PBF does not include power switches-it relies on external PFETs and a separate DC/DC stage.
How does the LTC4000IUFD#PBF support instant-on operation with a deeply discharged battery?
The LTC4000IUFD#PBF achieves instant-on by regulating the BGATE pin to maintain the OFB feedback voltage at 86% of the programmed float voltage (e.g., ~0.974V) when the battery voltage is below the VOUT(INST_ON) threshold. This forces the external battery PFET to operate in linear mode, delivering regulated output voltage to downstream circuitry before the battery reaches full charge. The LTC4000IUFD#PBF sustains this until the battery recovers sufficiently to enable normal switching-mode charging.
Can the LTC4000IUFD#PBF be used with lithium iron phosphate (LiFePO₄) batteries?
Yes, the LTC4000IUFD#PBF is explicitly validated for LiFePO₄ chemistries, as shown in its typical application circuit for a 3-cell (10.8V float) pack. Its ±0.25% float voltage accuracy, programmable C/X termination (e.g., C/10 for cell balancing), and wide 3V–60V input range make it ideal for LiFePO₄ systems requiring high efficiency, long cycle life, and robust thermal management via NTC input.
What external components are required for basic operation of the LTC4000IUFD#PBF?
Basic operation requires two external PFETs (for input and battery PowerPath), two current sense resistors (IN–CLN and CSP–CSN), resistor dividers for BFB/OFB voltage setting, an NTC thermistor with bias resistor, a timer capacitor on TMR, and compensation components (R-C network) between CC and ITH. The LTC4000IUFD#PBF also needs a separate DC/DC converter stage (e.g., LT3845A) whose control node connects to ITH.
Does the LTC4000IUFD#PBF integrate power MOSFETs or require external ones?
The LTC4000IUFD#PBF does not integrate any power MOSFETs. It provides dedicated gate drive outputs-IGATE for the input ideal diode PFET and BGATE for the battery ideal diode PFET-requiring external discrete PFETs (e.g., Si7135DP) selected for voltage rating, RDS(on), and thermal performance. This architecture enables scalability across current levels and optimizes efficiency in high-power designs.
LTC4000IUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC4000IUFD#PBF FAQ
1.How can I place an order for LTC4000IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000IUFD#PBF 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 LTC4000IUFD#PBF reliable?
The price and inventory of LTC4000IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4000IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4000IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000IUFD#PBF?
LTC4000IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000IUFD#PBF 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 LTC4000IUFD#PBF?
For technical support, including LTC4000IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000IUFD#PBF requirements.
6.How does Aetrix verify that LTC4000IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4000IUFD#PBF 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 LTC4000IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4000IUFD#PBF?
All LTC4000IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000IUFD#PBF, 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 LTC4000IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC4000IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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