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Analog Devices Inc. LTC4000EUFD#PBF
- Part No.:
- LTC4000EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4000EUFD#PBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHATE 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,403
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Product details
Overview
LTC4000EUFD#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 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 - used in industrial portable instruments and high-power battery systems.
For engineers reviewing the LTC4000EUFD#PBF datasheet, LTC4000EUFD#PBF pinout, LTC4000EUFD#PBF application, or LTC4000EUFD#PBF equivalent, key selection considerations include its dual ideal diode control (input + battery), NTC-based temperature qualified charging, C/X or timer-based termination, precision current sensing down to 50mV sense voltage, and compatibility with buck, boost, or SEPIC converter topologies.
Technical Context
The LTC4000EUFD#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 networks. Its PowerPath architecture uses two external PFETs: one for low-loss reverse-current blocking at the input (IID→CSP), another for seamless battery/system power handoff (BAT→CSN) with automatic gate drive clamping (13–15V) and fast turn-on/off thresholds (±40–130mV).
It integrates precision analog functions including 20× current-sense amplification (IIMON, IBMON), ±0.25% reference-based feedback (BFB = 1.136V, OFB = 1.193V), programmable recharge (97.6% of VBFB), instant-on activation (86% of VBFB), and NTC thermistor monitoring with cold/hot thresholds (75%/35% of VBIAS). All critical parameters 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 adapters, solar inputs, and industrial bus rails 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. |
| Current Sense Gain | 20 V/V - enables high-current charging (e.g., 10A) with only 50mV across sense resistor, minimizing power loss. |
| PowerPath Instant-On Threshold | 86% of VBFB (typ. 0.974V) - guarantees immediate system power delivery even when battery voltage drops below 3V. |
| NTC Temperature Monitoring | Cold threshold 75% VBIAS, hot threshold 35% VBIAS - provides safe charging suspension outside defined thermal window. |
| Charge Termination Options | C/X ratio (e.g., C/10) or 2.3–3.5h timer (CTMR = 0.1μF) - supports both capacity-based and time-limited safety cutoffs. |
| 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) soldered to PCB ground for thermal performance (θJC = 4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 10, 28, 29) | Device Ground Reference | Three dedicated ground pins plus exposed thermal pad - mandatory soldering ensures thermal integrity and noise immunity. |
| IN / CLN (Pins 27 / 26) | Input Supply & Current Sense Negative | Accepts 3–60V input; CLN forms differential pair with IN for 20× amplified input current monitoring. |
| CSP / CSN (Pins 20 / 19) | Battery Charge Sense Positive/Negative | Differential inputs for battery current sensing; also serve as cathodes for input/battery ideal diodes. |
| BAT / BGATE (Pins 17 / 18) | Battery Anode & PMOS Gate Drive | BAT connects to battery pack anode; BGATE drives external PFET to enable PowerPath discharge or instant-on regulation. |
| IGATE / IID (Pins 22 / 23) | Input PMOS Gate Drive & Anode | IGATE controls input-side PFET; IID is its anode - together implement low-loss reverse-blocking and load sharing. |
| BFB / OFB (Pins 16 / 21) | Battery & Output Feedback Inputs | High-impedance nodes referenced to FBG; set float voltage (1.136V) and output voltage (1.193V) via resistor dividers. |
| ITH / CC (Pins 24 / 25) | Control Voltage & Compensation Interface | ITH sinks up to 1mA to regulate loops; CC connects to external R-C network for stable DC/DC converter compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Intelligent PowerPath Control | Two independent PFET drivers (IGATE/BGATE) enable zero-loss reverse blocking, seamless battery/system power handoff, and instant-on operation below 3V battery voltage. |
| Precision Current Sensing | 20× gain with ±300µV offset allows accurate high-current regulation using low-value, low-power sense resistors (e.g., 5mΩ for 10A). |
| Temperature-Qualified Charging | NTC input with programmable cold/hot thresholds (75%/35% VBIAS) suspends charging outside safe thermal range - no external ADC or MCU required. |
| Flexible Charge Termination | Supports either C/X ratio (e.g., C/10) or timer-based cutoff (2.3–3.5h), with independent bad-battery detection timed at 3.95–4.05× termination duration. |
| Wide-Voltage Feedback Architecture | BFB (1.136V) and OFB (1.193V) references operate up to 60V common-mode - eliminates need for level-shifting or attenuator networks. |
Applications
| Industrial Portable Instruments | High-Power Battery Systems |
|---|---|
|
Use Scenario: Handheld test equipment requiring uninterrupted operation during hot-swap battery replacement and extended runtime on LiFePO₄ packs. IC Role / Device Role / Timing Role: LTC4000EUFD#PBF acts as master charge controller and PowerPath manager - regulating 10A charge current while enabling instant-on system power from deeply discharged cells. Use Value: Eliminates brownouts during battery swap; reduces sense resistor power loss by 75% vs. conventional 100mV designs; supports 3–60V universal input. |
Use Scenario: Rack-mounted energy storage unit with 48V LiFePO₄ stack, requiring high-efficiency charging, battery protection, and seamless AC/DC-to-load power routing. IC Role / Device Role / Timing Role: LTC4000EUFD#PBF configures external buck converter as precision charger and manages dual-path power delivery - prioritizing input supply while backing up loads via battery. Use Value: Achieves <100mV forward drop in PowerPath mode; enables programmable low-battery cutoff (68% VBFB) and automatic recharge at 97.6% VBFB. |
| Notebook/Subnotebook Computers | Industrial Battery-Equipped Devices |
|
Use Scenario: Ultra-thin subnotebook with space-constrained layout, dual-input capability (AC adapter + USB PD), and requirement for rapid battery top-off without thermal throttling. IC Role / Device Role / Timing Role: LTC4000EUFD#PBF serves as interface between buck-boost converter and battery pack - managing input current limit, charge termination, and NTC-based thermal derating. Use Value: ±1% input current accuracy prevents adapter overload; ±0.25% float voltage ensures cell longevity; 28-pin QFN minimizes PCB footprint. |
Use Scenario: Ruggedized handheld terminal used in warehouse logistics, operating 8–16 hours per charge on 3S LiFePO₄, with frequent partial recharges and exposure to ambient temperatures from –20°C to 60°C. IC Role / Device Role / Timing Role: LTC4000EUFD#PBF performs full-featured charging control - including cold-temperature charge suspension, C/10 trickle recovery, and bad-battery detection with 3.5h timeout. Use Value: Extends battery cycle life via precise voltage regulation; avoids field failures from overheating or over-discharge; operates reliably across full –40°C to 125°C junction range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4015IUFD#PBF | Integrated 12V/3.5A synchronous buck charger; no external converter needed; lacks 60V input support and dual PowerPath control. | Best for compact, fixed-input systems where board space is constrained and input voltage ≤14V. | Select LTC4015IUFD#PBF when integrated FETs and smaller solution size outweigh need for >30V input or independent converter selection. |
| BQ24610RGER | Fixed 20V max input; no NTC input; single ideal diode path; ±0.5% float voltage accuracy; no instant-on feature. | Suitable for cost-sensitive 12V–19V laptop-style chargers without thermal qualification or ultra-low battery startup. | Choose BQ24610RGER only for simpler, lower-voltage applications where PowerPath flexibility and precision are secondary to BOM cost. |
Compared with LTC4000EUFD#PBF, LTC4015IUFD#PBF trades external converter flexibility and 60V input for integration and reduced component count, while BQ24610RGER sacrifices accuracy, thermal safety, and PowerPath intelligence to meet aggressive cost targets - making LTC4000EUFD#PBF uniquely suited for high-reliability, wide-input, multi-chemistry industrial charging.
Availability
LTC4000EUFD#PBF is available at Aetrix Electronics and suitable for industrial portable instruments, high-power battery systems, and notebook/subnotebook computers requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC4000EUFD#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 high-performance analog IC portfolio, emphasizing precision, reliability, and ruggedness for industrial, aerospace, and medical applications.
The LTC4000EUFD#PBF belongs to Linear's Power Management family, designed specifically for high-voltage, high-current battery charging architectures where external DC/DC converter optimization, intelligent PowerPath control, and wide-temperature operation are essential.
FAQ
What is the primary function of the LTC4000EUFD#PBF in a battery charging system?
The LTC4000EUFD#PBF is a high-voltage battery charge controller IC 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™ functionality for seamless power handoff and instant-on operation. The LTC4000EUFD#PBF does not include power switches; it requires external PFETs and a DC/DC converter to complete the charging solution.
How does the LTC4000EUFD#PBF support instant-on operation with a deeply discharged battery?
The LTC4000EUFD#PBF monitors the OFB pin and, when VOFB falls below 86% of the programmed battery float voltage (e.g., ~0.974V for a 10.8V pack), regulates the BGATE pin to maintain that threshold - delivering immediate valid output voltage to downstream circuitry even if the battery is below 3V. This behavior is intrinsic to the LTC4000EUFD#PBF's PowerPath architecture and requires no external logic or firmware.
Can the LTC4000EUFD#PBF be used with lithium iron phosphate (LiFePO₄) batteries?
Yes - the LTC4000EUFD#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 recharge threshold (97.6% of VBFB), and C/10 trickle charge capability align precisely with LiFePO₄ requirements. The LTC4000EUFD#PBF's wide 3V–60V operating range also accommodates varying cell counts and input sources.
What external components are mandatory for basic operation of the LTC4000EUFD#PBF?
Four external elements are mandatory: (1) an external DC/DC converter (buck, boost, or SEPIC) whose control node connects to ITH; (2) two external PFETs for input and battery PowerPath control; (3) current sense resistors on IN–CLN and CSP–CSN paths; and (4) resistor dividers on BFB and OFB to set battery float and output voltages. The LTC4000EUFD#PBF also requires bypass capacitors on BIAS and VOUT, plus a timer capacitor on TMR for charge termination.
Does the LTC4000EUFD#PBF integrate NTC thermistor support for temperature-qualified charging?
Yes - the LTC4000EUFD#PBF includes a dedicated NTC pin with built-in comparators for cold (75% VBIAS) and hot (35% VBIAS) thresholds, plus 5% hysteresis. When the thermistor voltage moves outside this window, the LTC4000EUFD#PBF automatically suspends charging and holds the CHRG pin high-impedance. No external ADC, microcontroller, or signal conditioning is required - the LTC4000EUFD#PBF handles all temperature qualification internally.
LTC4000EUFD#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)
LTC4000EUFD#PBF FAQ
1.How can I place an order for LTC4000EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000EUFD#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 LTC4000EUFD#PBF reliable?
The price and inventory of LTC4000EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4000EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4000EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000EUFD#PBF?
LTC4000EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000EUFD#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 LTC4000EUFD#PBF?
For technical support, including LTC4000EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000EUFD#PBF requirements.
6.How does Aetrix verify that LTC4000EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4000EUFD#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 LTC4000EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4000EUFD#PBF?
All LTC4000EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000EUFD#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 LTC4000EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC4000EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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