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Analog Devices Inc. LTC4000EGN-1#PBF
- Part No.:
- LTC4000EGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4000EGN-1#PBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHAT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
LTC4000EGN-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 and output ranges, delivers ±0.25% accurate programmable float voltage, enables instant-on operation via PowerPath™ control, and is used in solar-powered LiFePO₄ battery chargers for industrial portable equipment.
For engineers reviewing the LTC4000EGN-1#PBF datasheet, LTC4000EGN-1#PBF pinout, LTC4000EGN-1#PBF application, or LTC4000EGN-1#PBF equivalent, key selection criteria include input voltage regulation loop (vs. current regulation), 28-lead SSOP package compatibility, ±1% programmable charge current accuracy, NTC-based temperature qualified charging, and dual ideal diode PowerPath™ control for reverse-blocking and instant-on system power.
Technical Context
The LTC4000EGN-1#PBF implements an input voltage regulation loop-distinct from the LTC4000's input current loop-enabling stable MPPT operation under variable solar irradiance. It integrates four independent regulation loops: input voltage (IFB = 1.000 V), battery float voltage (BFB = 1.136 V), output voltage (OFB = 1.193 V), and charge current (CL pin sourcing 50 µA).
Its PowerPath™ architecture uses two external PFETs: IGATE drives the input ideal diode for low-loss reverse blocking and load sharing; BGATE controls the battery ideal diode to enable instant-on operation when VOFB falls below 86% of VBFB_REG (≈0.974 V), ensuring downstream system power even with deeply discharged batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 60 V - supports wide-range solar panel open-circuit voltages up to 60 V and peak power points down to 17.6 V. |
| Input Regulation Voltage Accuracy | ±0.015 V at IFB - ensures precise solar MPPT setpoint stability across temperature (0.985–1.015 V range). |
| Battery Float Voltage Accuracy | ±0.007 V at BFB - enables ±0.25% float voltage programming critical for LiFePO₄ cell longevity (e.g., 10.8 V for 3-cell pack). |
| Charge Current Accuracy | ±1% - achieved via 50 µA CL pin current source and 20× precision current sensing (IBMON), reducing sense resistor power loss. |
| Operating Junction Temp | –40°C to 125°C - validated for industrial and military portable equipment operating in harsh thermal environments. |
| Package | 28-lead plastic SSOP - surface-mount compatible with standard reflow profiles; thermal resistance θJA = 80°C/W. |
| NTC Interface | Voltage thresholds at 35% (hot) and 75% (cold) of BIAS - supports Li-ion/LiFePO₄ temperature qualification without external ADC. |
Pinout & Package
The LTC4000EGN-1#PBF is housed in a 28-lead plastic SSOP package (GN), with exposed thermal pad not present (unlike QFN UFD variant). Pin 1 is marked by notch or dot; pin numbering follows standard SSOP convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENC (Pin 1) | Enable Charging Input | Digital logic control: >1.5 V enables charging; <0.5 V disables; internal 2 µA pull-up defaults to enabled state. |
| IFB (Pin 4) | Input Voltage Feedback | Sets input regulation point: divider ratio yields VIN_REG = (ROFB1/ROFB2 + 1) × 1.000 V. |
| BFB (Pin 12) | Battery Float Voltage Feedback | Sets battery float: VFLOAT = (RBFB1/RBFB2 + 1) × 1.136 V - critical for LiFePO₄ 3.6 V/cell accuracy. |
| OFB (Pin 17) | Output Voltage Feedback | Regulates system output during non-charging; drops to 0.974 V (86% of VBFB) for instant-on on deeply discharged batteries. |
| IGATE (Pin 18) | Input PMOS Gate Driver | Drives external PFET anode-to-cathode (IID→CSP); provides fast turn-on/off thresholds (±80 mV hysteresis) for low-loss reverse blocking. |
| BGATE (Pin 14) | Battery PMOS Gate Driver | Enables PowerPath™: regulates to ~13.5 V clamp during instant-on; turns off during charging to prevent backfeed. |
| CSN/CSP (Pins 15/16) | Current Sense Inputs | Measure battery charge current across external sense resistor; 20× gain allows ≤50 mV full-scale sensing for high-current designs. |
| NTC (Pin 10) | Thermistor Interface | Accepts NTC thermistor divider from BIAS; suspends charging if voltage falls outside 35–75% BIAS window. |
Key Features
| Feature | Design Value |
|---|---|
| Input Voltage Regulation Loop | Replaces input current regulation to maintain optimal solar panel operating voltage under varying irradiance and temperature. |
| PowerPath™ Instant-On | Activates when VOFB < 86% of VBFB_REG, regulating BGATE to deliver immediate system power from battery-even at <3 V per cell. |
| Four Independent Regulation Loops | Simultaneously manages input voltage (IFB), battery float (BFB), output voltage (OFB), and charge current (CL/IBMON) without external compensation. |
| High-Accuracy Sensing | ±0.25% float voltage, ±1% charge current, and ±0.015 V input regulation feedback enable robust battery management in mission-critical systems. |
| Temperature-Qualified Charging | Integrated NTC comparator with programmable hot/cold thresholds eliminates need for microcontroller-based thermal monitoring. |
Applications
| Solar-Powered Remote Monitoring Station | Military Portable Radio System |
|---|---|
Use Scenario: Off-grid environmental sensor node powered by 60 V open-circuit solar panel, charging 3-cell LiFePO₄ battery. IC Role / Device Role / Timing Role: LTC4000EGN-1#PBF acts as MPPT charge controller and PowerPath™ manager, regulating input at peak power voltage while maintaining 10.8 V float and enabling instant-on radio boot. Use Value: Achieves >98% MPPT efficiency and sustains system operation during dawn/dusk low-light periods via instant-on, eliminating cold-start failures. | Use Scenario: Manpack radio with 24 V nominal battery, requiring rapid field recharge from vehicle alternator or solar blanket. IC Role / Device Role / Timing Role: LTC4000EGN-1#PBF serves as high-voltage battery charger with input regulation, NTC thermal cutoff, and automatic recharge after partial discharge. Use Value: Enables safe, field-deployable charging across 3–60 V sources while preventing thermal runaway and extending battery cycle life. |
| Industrial IoT Gateway with Backup Battery | Off-Grid Telecom Base Station |
Use Scenario: Cellular gateway powered from PoE+ or 48 V DC supply, backed by sealed lead-acid or LiFePO₄ battery. IC Role / Device Role / Timing Role: LTC4000EGN-1#PBF functions as dual-input ideal diode controller and battery charger, managing seamless switchover and trickle maintenance. Use Value: Eliminates diode drop losses (<20 mV forward regulation) and supports C/10 trickle charge for long-term backup readiness. | Use Scenario: Rural telecom site using wind turbine (high-impedance source) and solar array to charge 48 V LiFePO₄ bank. IC Role / Device Role / Timing Role: LTC4000EGN-1#PBF operates as high-impedance input charger with programmable termination (CX/TMR) and bad-battery detection. Use Value: Prevents overcharge and detects failed cells via timed C/X termination and FLT/CHRG status pin sequencing. |
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#PBF | Same die, 28-lead 4 mm × 5 mm QFN package; θJA = 43°C/W vs. SSOP's 80°C/W; exposed pad requires PCB thermal relief. | Better thermal performance in space-constrained, high-power designs; incompatible pin layout with SSOP footprint. | Select for higher ambient temperatures or >10 A charge currents where thermal dissipation is critical. |
| BQ24650RGER | TI part with input current regulation (not voltage regulation); no MPPT engine; fixed 14.4 V float; no PowerPath™ instant-on. | Lower-cost solution for AC-DC or fixed-voltage DC sources; unsuitable for solar MPPT or instant-on requirements. | Choose only when solar input and instant-on are not required, and cost sensitivity outweighs feature gaps. |
Compared with LTC4000EUFD-1#PBF, the LTC4000EGN-1#PBF trades thermal performance for SSOP footprint compatibility and simplified assembly; versus BQ24650RGER, it adds MPPT, input voltage regulation, and PowerPath™-making it uniquely suited for solar-powered industrial and military systems requiring guaranteed startup under deep discharge.
Availability
LTC4000EGN-1#PBF is available at Aetrix Electronics and suitable for solar-powered battery charger systems, military portable equipment, and industrial IoT gateways requiring stable component supply, long-lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LTC4000EGN-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-accuracy battery charging with MPPT and intelligent PowerPath™ control-targeting solar, fuel cell, and wind-powered systems where input source impedance and battery state variability demand adaptive regulation.
FAQ
What is the primary function of the LTC4000EGN-1#PBF in a solar charging system?
The LTC4000EGN-1#PBF serves as a high-voltage battery charge controller with integrated maximum power point tracking (MPPT) and input voltage regulation. In solar applications, it dynamically adjusts the input operating point to maintain the solar panel at its peak power voltage (e.g., 17.6 V), while precisely regulating battery float voltage (±0.25%) and enabling instant-on system power via PowerPath™ control. The LTC4000EGN-1#PBF does not include a DC/DC converter but interfaces with external converters like the LT3845A to form a complete charger.
How does the LTC4000EGN-1#PBF differ from the standard LTC4000?
The LTC4000EGN-1#PBF features an input voltage regulation loop instead of the input current regulation loop found in the base LTC4000. This makes it optimized for solar MPPT applications where maintaining a specific input voltage maximizes energy harvest. The LTC4000EGN-1#PBF also includes updated PowerPath™ behavior for instant-on operation and revised NTC thresholds tailored for LiFePO₄ and Li-ion chemistries. Both share identical pinouts and core architecture, but their regulation strategies are fundamentally distinct.
Can the LTC4000EGN-1#PBF be used with lithium iron phosphate (LiFePO₄) batteries?
Yes, the LTC4000EGN-1#PBF is explicitly validated for LiFePO₄ battery charging, as shown in the typical application circuit for a 10.8 V (3-cell) LiFePO₄ pack. Its ±0.25% accurate battery float voltage regulation (VBFB_REG = 1.136 V) allows precise setting of 3.6 V per cell. The device supports temperature-qualified charging via NTC input and includes automatic recharge, C/10 trickle charge, and bad-battery detection-all critical for LiFePO₄ longevity and safety.
What package type does the LTC4000EGN-1#PBF use, and how does it compare to the QFN variant?
The LTC4000EGN-1#PBF uses a 28-lead plastic SSOP (GN) package, distinct from the 28-lead 4 mm × 5 mm QFN (UFD) used in the LTC4000EUFD-1#PBF. The SSOP offers easier visual inspection and rework but has higher thermal resistance (θJA = 80°C/W vs. 43°C/W for QFN). Both packages share identical pin functions and electrical specifications; however, they are not footprint-compatible, requiring separate PCB layouts. The LTC4000EGN-1#PBF is rated for –40°C to 125°C operation in the SSOP package.
Does the LTC4000EGN-1#PBF require external MOSFETs, and what are their roles?
Yes, the LTC4000EGN-1#PBF requires two external P-channel MOSFETs: one driven by IGATE for input ideal diode functionality (reverse current blocking and load sharing), and another driven by BGATE for battery ideal diode control (instant-on and efficient charging path). These MOSFETs replace lossy Schottky diodes, achieving <20 mV forward regulation voltage. The LTC4000EGN-1#PBF provides gate drive clamping (13–15 V), fast turn-on/turn-off thresholds, and hysteresis to ensure robust switching under dynamic load and source conditions.
LTC4000EGN-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC4000EGN-1#PBF FAQ
1.How can I place an order for LTC4000EGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000EGN-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 LTC4000EGN-1#PBF reliable?
The price and inventory of LTC4000EGN-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 LTC4000EGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4000EGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000EGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000EGN-1#PBF?
LTC4000EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000EGN-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 LTC4000EGN-1#PBF?
For technical support, including LTC4000EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000EGN-1#PBF requirements.
6.How does Aetrix verify that LTC4000EGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4000EGN-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 LTC4000EGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4000EGN-1#PBF?
All LTC4000EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000EGN-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 LTC4000EGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC4000EGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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