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Analog Devices Inc. LTC4000EGN-1#TRPBF
- Part No.:
- LTC4000EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4000EGN-1#TRPBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHAT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,886
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Product details
Overview
LTC4000EGN-1#TRPBF 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 converts external DC/DC converters into full-featured chargers for LiFePO₄ and other chemistries, supporting 3V–60V input, ±0.25% float voltage accuracy, programmable C/X or timer-based termination, and NTC-based temperature qualification - deployed in 10.8V/10A solar-powered three-cell LiFePO₄ battery systems.
For engineers reviewing the LTC4000EGN-1#TRPBF datasheet, LTC4000EGN-1#TRPBF pinout, LTC4000EGN-1#TRPBF application, or LTC4000EGN-1#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed MPPT performance (>98% peak power), real-world PowerPath™ implementation details, and precise alternative part comparisons for industrial solar charger design.
Technical Context
The LTC4000EGN-1#TRPBF implements an input voltage regulation loop (not current regulation like LTC4000), enabling stable solar input harvesting under variable irradiance. Its dual ideal diode architecture uses external PFETs for low-loss reverse blocking at the input (IID→CSP) and intelligent PowerPath™ control at the battery (BAT→CSN), delivering instant-on operation even with deeply discharged batteries.
It integrates four independent regulation loops - input voltage (IFB), battery float voltage (BFB), output voltage (OFB), and charge current (IBMON/CL) - each driving the ITH control node to coordinate external DC/DC converter behavior. Precision current sensing (20× gain, ±300µV offset) enables accurate high-current charging up to 10A with 5mΩ sense resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range solar panels, fuel cells, and wind turbines without pre-regulation. |
| Float Voltage Accuracy | ±0.25% - ensures tight cell voltage control critical for LiFePO₄ longevity and safety compliance. |
| Charge Current Limit Accuracy | ±1% - enables reliable high-current charging (e.g., 10A) using external 5mΩ sense resistor and CL pin programming. |
| MPPT Efficiency | >98% typical - achieves near-peak solar power extraction via input voltage regulation loop, not open-circuit sampling. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and military portable equipment operating in harsh thermal environments. |
| Package | 28-lead SSOP - surface-mount package with exposed thermal pad (GND) for enhanced heat dissipation in high-power applications. |
| Quiescent Current | 0.4mA (input), 10–20µA (battery-only) - minimizes standby loss in off-grid solar systems with intermittent input. |
Pinout & Package
The LTC4000EGN-1#TRPBF is housed in a 28-lead plastic SSOP package (GN suffix), with pins 1–14 on top row and 15–28 on bottom row. Exposed thermal pad is not present in SSOP; GND connections are at pins 6, 24, and FBG (pin 11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENC (Pin 1) | Enable Charging Input | Digital logic control: >1.5V enables charging; <0.5V disables; open-circuit defaults to enabled via internal 2µA pull-up. |
| IFB (Pin 4) | Input Voltage Feedback | Sets input regulation point: 1.000V reference enables precise solar VMPPT control (e.g., 17.6V peak power point). |
| BFB (Pin 12) | Battery Float Voltage Feedback | 1.136V reference enables accurate 10.8V three-cell LiFePO₄ float via resistor divider (RBFB1/RBFB2). |
| CL (Pin 8) | Charge Current Limit Programming | 50µA sink sets current limit: ICHG = 2.5µA × RCL / RCS; supports 10A with 5mΩ sense resistor. |
| IGATE (Pin 18) | Input PFET Gate Driver | Drives external PMOS for low-loss input ideal diode; clamped to 13–15V to ensure robust gate overdrive. |
| BGATE (Pin 14) | Battery PFET Gate Driver | Enables PowerPath™: regulates output during deep discharge to deliver instant-on VOUT ≥ 86% of float voltage. |
| ITH (Pin 20) | Control Voltage Output | High-impedance node sinks up to 1mA to coordinate external DC/DC converter compensation and loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Input Voltage Regulation Loop | Replaces input current regulation to maintain optimal solar panel operating voltage under varying light conditions - essential for true MPPT in non-constant-current sources. |
| PowerPath™ Instant-On | Regulates BGATE to sustain ≥86% of battery float voltage at OFB during deep discharge, powering downstream loads immediately without waiting for battery recharge. |
| NTC-Based Temperature Qualification | Monitors thermistor voltage (73–77% cold, 33–37% hot of BIAS) to suspend charging outside safe Li-ion/LiFePO₄ thermal range - prevents thermal runaway. |
| Bad Battery Detection | Triggers FLT pin after tBB = 2.3–3.5h if BFB remains below 65–71% of float voltage - identifies shorted or degraded cells before damage occurs. |
| Programmable C/X Termination | Uses CX pin (5µA source) and IBMON to terminate charge at C/10 or user-defined fraction - avoids overcharge while supporting trickle top-off for deeply discharged cells. |
Applications
| Solar-Powered Remote Monitoring Station | Off-Grid Military Portable Radio System |
|---|---|
Use Scenario: Standalone environmental sensor node powered by 60V-open-circuit solar panel in desert deployment, charging 3S LiFePO₄ pack for 24/7 operation. IC Role / Device Role / Timing Role: LTC4000EGN-1#TRPBF acts as MPPT charge controller and PowerPath™ manager - regulating solar input to 17.6V, maintaining 10.8V float, and enabling instant system boot from dead battery. Use Value: >98% MPPT efficiency maximizes daily energy harvest; ±0.25% float accuracy extends battery cycle life beyond 2,000 cycles at 80% DoD. | Use Scenario: Manpack radio with integrated 3S LiFePO₄ battery, requiring immediate power-on when connected to vehicle alternator or solar blanket, with field-replaceable battery health monitoring. IC Role / Device Role / Timing Role: LTC4000EGN-1#TRPBF serves as intelligent battery manager - detecting bad cells via FLT assertion, enforcing NTC-qualified charging, and isolating battery during fault via BGATE control. Use Value: Bad battery detection (tBB = 2.9h typical) prevents mission-critical failure; PowerPath™ ensures zero boot delay even after battery deep discharge to 2.5V/cell. |
| Fuel Cell–Powered Industrial Data Logger | Marine Auxiliary Battery Charger |
Use Scenario: Subsea data acquisition unit powered by PEM fuel cell (40V nominal), charging dual 3S LiFePO₄ banks with strict thermal limits and low-quiescent operation. IC Role / Device Role / Timing Role: LTC4000EGN-1#TRPBF provides high-impedance input regulation (IFB), precision current sensing (IBMON), and NTC qualification - rejecting fuel cell ripple while maintaining safe charge profiles. Use Value: 10–20µA battery-only quiescent current preserves charge during weeks of idle subsea deployment; ±1% current limit ensures consistent 5A charging across temperature. | Use Scenario: Yacht auxiliary system charging house bank from alternator or solar array, with automatic load sharing between battery and input source using dual ideal diodes. IC Role / Device Role / Timing Role: LTC4000EGN-1#TRPBF configures IGATE and BGATE to enable seamless switchover between alternator (input) and battery (backup), preventing backfeed and minimizing voltage drop. Use Value: Input and battery PowerPath™ forward regulation ≤20mV reduces conduction loss vs. Schottky diodes; instant-on ensures nav electronics remain powered during engine start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000EUFD-1#TRPBF | Same die, 4mm × 5mm QFN package with exposed thermal pad; θJA = 43°C/W vs. SSOP's 80°C/W. | Better thermal performance in space-constrained, high-power designs; requires different PCB layout and reflow profile. | Select for >5A continuous operation or ambient >85°C; SSOP preferred for legacy board compatibility and lower cost. |
| BQ24650RTWR | TI part with fixed 14.4V/16.8V float; no input voltage regulation loop; max 60V input but only 3A charge current; no MPPT capability. | Limited to AC-DC adapter or fixed-voltage input; unsuitable for solar MPPT or >3A LiFePO₄ charging. | Choose only for cost-sensitive, low-current, non-solar applications where MPPT and high accuracy are unnecessary. |
Compared with LTC4000EUFD-1#TRPBF, the LTC4000EGN-1#TRPBF offers identical functionality but higher thermal resistance - making it suitable for moderate-power designs where SSOP footprint and assembly familiarity outweigh thermal demands. Versus BQ24650RTWR, the LTC4000EGN-1#TRPBF delivers true MPPT, 10A capability, and ±0.25% float accuracy - essential for solar and military-grade reliability.
Availability
LTC4000EGN-1#TRPBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring stations, off-grid military portable radio systems, and fuel cell–powered industrial data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC4000EGN-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 (now part of Analog Devices, Inc., formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and defense markets.
The LTC4000-1 product line was designed specifically for high-voltage, high-accuracy battery charging with MPPT and intelligent PowerPath™ control - targeting solar, fuel cell, and ruggedized portable equipment where input source impedance and battery health are critical.
FAQ
What is the key functional difference between LTC4000EGN-1#TRPBF and the base LTC4000?
The LTC4000EGN-1#TRPBF features an input voltage regulation loop, whereas the standard LTC4000 uses input current regulation. This makes the LTC4000EGN-1#TRPBF uniquely suited for maximum power point tracking with high-impedance sources like solar panels, where maintaining optimal input voltage-not current-is critical for >98% peak power extraction. The LTC4000EGN-1#TRPBF does not support input current regulation mode.
How does LTC4000EGN-1#TRPBF implement instant-on functionality for deeply discharged batteries?
The LTC4000EGN-1#TRPBF regulates the BGATE pin to maintain the OFB feedback voltage at ≥86% of the programmed battery float voltage (e.g., 0.974V for a 1.136V BFB reference). This forces the external battery PFET to conduct, delivering immediate system power from the input source through the CSN pin-even when the battery is below 2.5V/cell. The feature activates automatically when VOFB falls below VOUT(INST_ON), as defined in the electrical characteristics table.
Can LTC4000EGN-1#TRPBF be used with lithium-ion batteries, and what thermal safeguards does it provide?
Yes, LTC4000EGN-1#TRPBF supports Li-ion via NTC thermistor qualification: it suspends charging when the NTC pin voltage falls outside 33–37% (hot) or 73–77% (cold) of the BIAS voltage, corresponding to safe Li-ion temperature bands. The FLT pin asserts during over/under-temperature faults, and charging resumes automatically once the thermistor voltage returns to the valid window - all without microcontroller intervention.
What is the role of the ITH pin in LTC4000EGN-1#TRPBF, and how is it interfaced with external converters?
The ITH pin is a high-impedance control node that sinks up to 1mA when any regulation loop (input voltage, battery float, charge current, or output voltage) reaches its limit. It connects directly to the compensation node (e.g., error amplifier output) of an external DC/DC converter like the LT3845A. By pulling ITH low, the LTC4000EGN-1#TRPBF commands the converter to reduce duty cycle - enabling coordinated, multi-loop regulation without additional control circuitry.
Does LTC4000EGN-1#TRPBF support both solar and non-solar input sources, and what are the voltage limits?
Yes, LTC4000EGN-1#TRPBF supports any DC input source from 3V to 60V, including solar panels (with MPPT), fuel cells, wind turbines, and vehicle alternators. Its absolute maximum rating is 62V on IN, CLN, CSP, CSN, BAT, OFB, BFB, and FBG pins. The input voltage regulation loop (via IFB) is optimized for solar MPPT but functions identically with any stable or variable high-impedance source within the 3–60V operating range.
LTC4000EGN-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC4000EGN-1#TRPBF FAQ
1.How can I place an order for LTC4000EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000EGN-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 LTC4000EGN-1#TRPBF reliable?
The price and inventory of LTC4000EGN-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 LTC4000EGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4000EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000EGN-1#TRPBF?
LTC4000EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000EGN-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 LTC4000EGN-1#TRPBF?
For technical support, including LTC4000EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC4000EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4000EGN-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 LTC4000EGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4000EGN-1#TRPBF?
All LTC4000EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000EGN-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 LTC4000EGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4000EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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