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Analog Devices Inc. LTC4000EUFD-1#PBF
- Part No.:
- LTC4000EUFD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4000EUFD-1#PBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHATE 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,793
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Product details
Overview
LTC4000EUFD-1#PBF from Analog Devices is a high-voltage, high-performance battery charge controller with input voltage regulation and maximum power point tracking (MPPT) for solar panel inputs. It supports 3V–60V input, delivers up to 10A charge current, achieves >98% MPPT efficiency, and enables instant-on operation via PowerPath™ control using external PFETs. It is used in solar-powered LiFePO₄ battery systems requiring precise float voltage (±0.25%) and temperature-qualified charging.
For engineers reviewing the LTC4000EUFD-1#PBF datasheet, LTC4000EUFD-1#PBF pinout, LTC4000EUFD-1#PBF application, or LTC4000EUFD-1#PBF equivalent, key selection criteria include input voltage regulation loop (vs. current regulation), ±1% programmable charge current accuracy, NTC-based thermal qualification, 28-lead QFN package thermal performance (θJA = 43°C/W), and compatibility with externally compensated DC/DC converters for full-featured charging.
Technical Context
The LTC4000EUFD-1#PBF implements four independent regulation loops: input voltage (regulated to 1.000 V at IFB), battery float voltage (1.136 V at BFB), output voltage (1.193 V at OFB), and charge current (via CL and IBMON). Its input voltage regulation loop-distinct from the LTC4000's input current regulation-enables stable operation with high-impedance sources like solar panels under varying irradiance.
PowerPath™ control uses two external PFETs: IGATE drives the input ideal diode (IID→CSP), while BGATE controls the battery ideal diode (BAT→CSN), enabling reverse-current blocking, load sharing, and instant-on system power even with deeply discharged batteries (VOUT(INST_ON) triggers at 86% of VBFB_REG).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range solar panel open-circuit voltages and fuel cell inputs without external pre-regulation. |
| Input Regulation Accuracy | ±0.015V at IFB (0.985–1.010V) - ensures stable MPPT operation by tightly controlling input source voltage under dynamic conditions. |
| Battery Float Voltage Accuracy | ±0.007V at BFB (1.120–1.147V) - enables precise 10.8V three-cell LiFePO₄ charging with ±0.25% tolerance. |
| Charge Current Accuracy | ±1% - achieved via 50µA CL pin current and 20× gain current monitoring (IBMON), supporting high-current applications with low sense resistor losses. |
| NTC Temperature Thresholds | Cold: 75% VBIAS; Hot: 35% VBIAS - provides configurable thermal qualification for Li-ion/LiFePO₄ with 5% hysteresis to prevent oscillation. |
| Package Thermal Resistance | θJA = 43°C/W (QFN) - enables 125°C junction operation at 10A with moderate PCB copper area, critical for industrial solar chargers. |
| Operating Junction Temp | –40°C to 125°C - qualified for harsh environments including military portable equipment and outdoor solar installations. |
Pinout & Package
The LTC4000EUFD-1#PBF is housed in a 28-lead, 4mm × 5mm plastic QFN package with exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity. Pin pitch is 0.5mm; package height is 0.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IFB (Pin 4) | Input voltage feedback input | High-impedance node regulated to 1.000V; sets input voltage regulation point (e.g., 17.6V peak power point for solar). |
| BFB (Pin 16) | Battery float voltage feedback input | High-impedance node regulated to 1.136V; defines final charge voltage (e.g., 10.8V for 3× LiFePO₄). |
| OFB (Pin 21) | Output voltage feedback input | Regulated to 1.193V during non-charging; drops to 0.974V during instant-on to sustain downstream system power. |
| IGATE (Pin 22) | Input PFET gate driver output | Drives external PMOS anode-to-cathode (IID→CSP); provides low-loss reverse blocking and load sharing. |
| BGATE (Pin 18) | Battery PFET gate driver output | Controls BAT→CSN ideal diode; regulates to enable instant-on when battery is deeply discharged. |
| CL (Pin 8) | Charge current limit programming | Sources 50µA; sets max charge current as ICLIM = 2.5µA × RCL/RCS; supports up to 10A with 5mΩ sense resistor. |
| CX (Pin 7) | Charge termination threshold | Sources 5µA; compares against IBMON to trigger C/X termination (e.g., C/10 trickle for deeply discharged cells). |
| NTC (Pin 14) | Thermistor interface input | Monitors NTC voltage vs. BIAS; suspends charging if outside 35–75% VBIAS range, ensuring safe Li-ion/LiFePO₄ operation. |
Key Features
| Feature | Design Value |
|---|---|
| Input voltage regulation loop | Replaces input current regulation to optimize MPPT for solar panels with variable IV curves and high source impedance. |
| PowerPath™ dual-PFET control | Enables zero-loss reverse current blocking, seamless load sharing between input and battery, and instant-on system power without external supervisor ICs. |
| Precision current sensing | 20× gain amplifier with ±300µV offset allows use of ≤5mΩ sense resistors, reducing power loss and thermal stress in 10A+ designs. |
| Temperature-qualified charging | Hardware-based NTC monitoring with cold/hot thresholds and hysteresis eliminates firmware dependency for battery safety compliance. |
| Bad battery detection | Automatically identifies shorted or open-circuit batteries via timed low-voltage monitoring on BFB, preventing unsafe charging attempts. |
Applications
| Solar-Powered Remote Monitoring | Military Portable Power Systems |
|---|---|
Use Scenario: Off-grid environmental sensor node powered by a 60V-max solar panel and 3-cell LiFePO₄ battery pack. IC Role / Device Role / Timing Role: LTC4000EUFD-1#PBF acts as MPPT charge controller and PowerPath manager, regulating input voltage to maximize harvest while maintaining 10.8V battery float and enabling instant system boot. Use Value: >98% MPPT efficiency extends operational uptime; input voltage regulation prevents panel collapse under load; QFN package supports compact, convection-cooled enclosure design. | Use Scenario: Ruggedized handheld radio with hot-swappable LiFePO₄ battery and auxiliary solar charging capability in field-deployed operations. IC Role / Device Role / Timing Role: LTC4000EUFD-1#PBF serves as intelligent battery charger and seamless power selector, managing charge from vehicle alternator, solar panel, or external adapter while sustaining radio operation during battery swaps. Use Value: Instant-on feature powers radio immediately upon connection-even with 0V battery; –40°C to 125°C rating ensures reliability in desert/arctic conditions; NTC qualification meets MIL-STD-810H thermal safety requirements. |
| Fuel Cell Backup Power | Industrial Solar UPS |
Use Scenario: Telecom base station backup using proton exchange membrane (PEM) fuel cell (3–60V output) and 24V LiFePO₄ battery bank. IC Role / Device Role / Timing Role: LTC4000EUFD-1#PBF regulates fuel cell output voltage to prevent starvation, charges battery with precision float control, and manages bidirectional power flow via PowerPath. Use Value: Input voltage regulation avoids fuel cell voltage droop-induced shutdown; ±0.25% float accuracy extends battery cycle life; 60V absolute max rating accommodates fuel cell transients without clamping. | Use Scenario: Factory-floor uninterruptible power supply with rooftop solar input, 48V LiFePO₄ stack, and continuous PLC load requiring zero-downtime switchover. IC Role / Device Role / Timing Role: LTC4000EUFD-1#PBF coordinates solar MPPT, battery charging, and seamless AC/DC/solar/battery source arbitration using dual ideal diodes and status pins (CHRG/FLT). Use Value: Hardware-based PowerPath eliminates software-controlled switchover delays; RST pin integration disables upstream converter during brownout; QFN thermal performance sustains 10A charge in enclosed cabinet. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000EGN-1#PBF | Same die, 28-lead SSOP package (θJA = 80°C/W); no exposed thermal pad; identical electrical specs. | Preferred for through-hole assembly or legacy SSOP-compatible PCBs; lower thermal performance limits max continuous current in high-ambient environments. | Select when board assembly process requires SSOP or when thermal derating to ≤6A is acceptable for cost-sensitive designs. |
| BQ24650RTWR | TI part with input current regulation (not voltage regulation); fixed 14.4V/16.8V float; no MPPT or PowerPath; 20-pin WQFN. | Targeted at simpler AC/DC adapter-based charging; lacks solar optimization, instant-on, or dual ideal diode control. | Choose only for basic constant-current/constant-voltage charging where MPPT, wide input range, or seamless source handoff are unnecessary. |
Compared with LTC4000EGN-1#PBF, the LTC4000EUFD-1#PBF offers superior thermal management for high-current solar applications; versus BQ24650RTWR, it provides hardware-based MPPT, input voltage regulation, and PowerPath™-critical for energy-harvesting and mission-critical power systems.
Availability
LTC4000EUFD-1#PBF is available at Aetrix Electronics and suitable for solar-powered battery charger systems, military portable equipment, and industrial UPS requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC4000EUFD-1#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LTC4000-1 product line was designed specifically for high-voltage, high-efficiency battery charging with maximum power point tracking-targeting solar, fuel cell, and wind-powered systems where input source impedance and transient response are critical.
FAQ
What is the primary functional difference between LTC4000EUFD-1#PBF and the standard LTC4000?
The LTC4000EUFD-1#PBF features an input voltage regulation loop (set via IFB pin at 1.000V), whereas the standard LTC4000 uses input current regulation. This makes the LTC4000EUFD-1#PBF uniquely suited for high-impedance sources like solar panels, where maintaining optimal input voltage maximizes power extraction-confirmed in the datasheet's typical application and feature list.
Does LTC4000EUFD-1#PBF support Li-ion battery chemistries?
Yes, LTC4000EUFD-1#PBF supports Li-ion via its NTC thermistor input (Pin 14), which qualifies charging based on temperature thresholds (35–75% VBIAS). However, the datasheet explicitly states "NTC functionality supports Li-Ion batteries only" - confirming native compatibility, unlike LiFePO₄ which relies on voltage-based qualification.
How does the instant-on feature work in LTC4000EUFD-1#PBF?
The LTC4000EUFD-1#PBF activates instant-on when the OFB pin voltage falls below VOUT(INST_ON) (86% of VBFB_REG, typically 0.974V). In this state, BGATE regulates to maintain that OFB level, delivering immediate system power from the battery-even if deeply discharged-without waiting for recharge, as verified in the Electrical Characteristics table and Pin Functions description.
What is the role of the FBG pin in LTC4000EUFD-1#PBF?
The FBG pin (Pin 15) serves as the common ground return for the BFB and OFB resistor dividers. It connects to GND via a 100–400Ω internal resistor only when IN voltage exceeds 3V; otherwise, it disconnects to prevent battery drain during standby-ensuring zero-quiescent-current operation when input is absent, per Absolute Maximum Ratings and Pin Functions documentation.
Can LTC4000EUFD-1#PBF operate without external PFETs?
No-LTC4000EUFD-1#PBF requires two external PFETs: one driven by IGATE for input ideal diode function (IID→CSP), and another driven by BGATE for battery ideal diode (BAT→CSN). These are mandatory for PowerPath™ control, reverse-current protection, and instant-on operation, as stated in the DESCRIPTION and PIN FUNCTIONS sections.
LTC4000EUFD-1#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-1#PBF FAQ
1.How can I place an order for LTC4000EUFD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000EUFD-1#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-1#PBF reliable?
The price and inventory of LTC4000EUFD-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4000EUFD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000EUFD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000EUFD-1#PBF?
LTC4000EUFD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000EUFD-1#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-1#PBF?
For technical support, including LTC4000EUFD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000EUFD-1#PBF requirements.
6.How does Aetrix verify that LTC4000EUFD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4000EUFD-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4000EUFD-1#PBF?
All LTC4000EUFD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000EUFD-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC4000EUFD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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