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Analog Devices Inc. LTC4000IGN-1#PBF
- Part No.:
- LTC4000IGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4000IGN-1#PBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHAT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
LTC4000IGN-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 ±1% programmable charge current and ±0.25% accurate float voltage, and enables instant-on operation during charging of deeply discharged LiFePO₄ batteries in off-grid solar systems.
For engineers reviewing the LTC4000IGN-1#PBF datasheet, LTC4000IGN-1#PBF pinout, LTC4000IGN-1#PBF application, or LTC4000IGN-1#PBF equivalent, key selection considerations include its input voltage regulation loop (vs. current regulation in LTC4000), dual PowerPath™ ideal diode control, NTC-based temperature qualification, and compatibility with external DC/DC converters for full-featured charger implementation.
Technical Context
The LTC4000IGN-1#PBF implements three independent regulation loops: input voltage (regulated to 1.000 V at IFB), battery float voltage (1.136 V at BFB), and output voltage (1.193 V at OFB). Its ITH pin interfaces directly with the compensation node of an external DC/DC converter to coordinate control across all loops.
It features dual external PFET drivers-IGATE for input ideal diode (forward regulation ≤20 mV) and BGATE for battery PowerPath (instant-on activation at 86% of float voltage)-and integrates precision current sensing with 20× gain and ≤300 µV offset for high-current applications up to 10 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 60 V - supports wide-range sources including solar panels (≤60 V open-circuit), fuel cells, and wind turbines. |
| Charge Current Accuracy | ±1% - achieved via 50 µA CL pin current source and 20× current sense amplification, enabling precise high-current regulation. |
| Float Voltage Accuracy | ±0.25% - 1.136 V reference at BFB ensures stable termination voltage for LiFePO₄ and other chemistries. |
| Input Regulation Voltage | 1.000 V at IFB - sets regulated input voltage using external resistor divider; replaces input current regulation of LTC4000. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and military portable equipment in harsh thermal environments. |
| Package | 28-lead SSOP - surface-mount package with exposed thermal pad (GND) and 80°C/W θJA for reliable power dissipation. |
| NTC Interface | Voltage thresholds at 35% (hot) and 75% (cold) of BIAS - enables safe temperature-qualified charging for Li-ion batteries only. |
Pinout & Package
The LTC4000IGN-1#PBF is housed in a 28-lead plastic SSOP package (GN), with GND pins at positions 6, 24 and internal thermal pad not present (unlike QFN UFD variant). Pin functions are identical between SSOP and QFN packages per datasheet Rev B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENC (Pin 1) | Enable Charging Input | Digital logic input: >1.5 V enables charging; <0.5 V disables; open-circuit defaults to enabled via 2 µA internal pull-up. |
| IBMON (Pin 2) | Battery Charge Current Monitor | 20× amplified sense voltage (VCSP–CSN); used for current limiting and C/X termination comparison. |
| CX (Pin 3) | Charge Termination Threshold | 5 µA-sourced input compared to IBMON; triggers immediate current cutoff when threshold exceeded. |
| CL (Pin 4) | Charge Current Limit Programming | 50 µA-sourced input setting ILIM = 2.5 µA × RCL/RCS; open = max limit (50 mV/RCS). |
| TMR (Pin 5) | Charge Timer Control | Configures timer capacitor (CTMR) for 2.9 h typical termination; short to BIAS enables C/X-only termination. |
| GND (Pins 6, 24) | Device Ground | Primary ground return for analog and power sections; must be connected to low-impedance PCB plane. |
| FLT / CHRG (Pins 7, 8) | Status Indicator Outputs | Open-drain outputs: FLT asserts on over/under-temp or bad battery; CHRG asserts during active charge cycle. |
| BIAS (Pin 9) | Internal 2.9 V Regulator | Supplies bias for NTC divider and internal circuitry; requires ≥470 nF bypass capacitor. |
| NTC (Pin 10) | Thermistor Interface | Monitors NTC voltage vs. BIAS-derived thresholds to suspend charging outside safe temperature range. |
| FBG (Pin 11) | Feedback Ground Return | 100 Ω switchable ground for BFB/OFB dividers; disconnects when IN <3 V to prevent battery drain. |
| BFB (Pin 12) | Battery Float Voltage Feedback | High-Z input regulated to 1.136 V; sets float voltage via resistor divider from BAT to FBG. |
| BAT (Pin 13) | Battery Anode Connection | Connects to positive terminal of battery pack; serves as anode for battery PowerPath PMOS. |
| BGATE (Pin 14) | Battery PMOS Gate Driver | Drives external PFET for low-loss battery discharge and instant-on regulation at 0.974 V (86% of float). |
| CSN (Pin 15) | Current Sense Negative / Diode Cathode | Negative side of sense resistor (with CSP); also cathode of battery ideal diode (anode = BAT). |
| CSP (Pin 16) | Current Sense Positive / Diode Cathode | Positive side of sense resistor (with CSN); also cathode of input ideal diode (anode = IID). |
| OFB (Pin 17) | Output Voltage Feedback | Regulated to 1.193 V during load-only operation; drops to 0.974 V during instant-on mode. |
| IGATE (Pin 18) | Input PMOS Gate Driver | Drives external PFET for input ideal diode; clamped to 13–15 V; turns off fast when input invalid. |
| IID (Pin 19) | Input Ideal Diode Anode | Connects to input source (e.g., solar panel); anode of input ideal diode (cathode = CSP). |
| ITH (Pin 20) | Control Voltage Output | Sinks up to 1 mA to regulate loops; connects to DC/DC converter compensation node for coordinated control. |
| CC (Pin 21) | Converter Compensation | Accepts R-C network tied to ITH to stabilize overall system loop response. |
| VM (Pin 25) | Voltage Monitor Input | 1.193 V comparator threshold; controls RST output; used for system voltage supervision (e.g., input UVLO). |
| RST (Pin 26) | Reset Output | Open-drain output pulled low when VM <1.193 V; can disable downstream DC/DC converter or drive LED. |
| IIMON (Pin 27) | Input Current Monitor | 20× amplified sense voltage (VIN–CLN); provides proportional representation of input current. |
| IFB (Pin 28) | Input Voltage Feedback | Regulated to 1.000 V; sets input regulation point via resistor divider from IN to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Input Voltage Regulation Loop | Replaces LTC4000's input current regulation with precise 1.000 V IFB reference for MPPT stability under varying solar irradiance. |
| Dual Ideal Diode PowerPath™ | Separate IGATE and BGATE drivers enable low-loss reverse blocking (≤20 mV) and seamless transition between input and battery power. |
| Instant-On Battery Support | Regulates BGATE to maintain ≥86% of float voltage at OFB, delivering valid system output even with 0 V battery input. |
| Temperature-Qualified Charging | NTC interface with cold/hot thresholds (75%/35% of BIAS) suspends charging outside safe Li-ion thermal range. |
| Bad Battery Detection | Monitors BFB voltage during charge; asserts FLT if below low-battery threshold (68% of VBFB_REG) for >2.9 h. |
Applications
| Solar-Powered Remote Monitoring | Military Portable Power System |
|---|---|
Use Scenario: Off-grid environmental sensor node powered by 60 V solar array with 3-cell LiFePO₄ backup battery. IC Role / Device Role / Timing Role: LTC4000IGN-1#PBF regulates solar input voltage to maximize power extraction while managing battery charge profile and enabling instant system boot. Use Value: Achieves >98% MPPT efficiency and maintains 10.8 V float for LiFePO₄, extending field deployment life without grid dependency. | Use Scenario: Ruggedized handheld radio with hot-swappable battery packs and solar recharging capability in expeditionary environments. IC Role / Device Role / Timing Role: LTC4000IGN-1#PBF acts as intelligent battery manager with NTC-based thermal safety, PowerPath™ load sharing, and fault reporting via FLT/CHRG pins. Use Value: Enables continuous operation during battery swap and prevents thermal runaway during rapid solar recharge in desert conditions. |
| Fuel Cell–Powered Industrial IoT Gateway | Emergency Backup Power for Telecom Site |
Use Scenario: Fixed-location edge gateway powered by low-impedance hydrogen fuel cell (24–48 V) with LiFePO₄ buffer battery. IC Role / Device Role / Timing Role: LTC4000IGN-1#PBF regulates variable fuel cell output, enforces precise 3.6 V/cell float, and manages C/10 trickle charge for long-term standby. Use Value: Eliminates need for separate input regulator and battery management IC, reducing BOM count and board area by 30%. | Use Scenario: Cellular base station backup system using solar-charged 48 V LiFePO₄ bank with automatic failover during grid outage. IC Role / Device Role / Timing Role: LTC4000IGN-1#PBF coordinates solar MPPT, battery charging, and seamless PowerPath™ switchover to maintain uninterrupted 54 V output. Use Value: Delivers <100 µs switchover time and supports 10 A continuous discharge, meeting GR-1089 telecom reliability requirements. |
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 functionality and pinout, but in 4 mm × 5 mm QFN package with lower θJA (43°C/W) and exposed thermal pad. | Preferred for space-constrained or thermally demanding layouts where PCB real estate and thermal performance are critical. | Select when higher power density and improved thermal management are required; requires different footprint and reflow profile. |
| BQ24650RGER | TI part with integrated MOSFET drivers but no input voltage regulation loop; supports only input current regulation and fixed 14.4 V float. | Lacks MPPT input voltage regulation and flexible float programming; limited to 12 V–16.5 V battery systems. | Choose only for cost-sensitive, lower-voltage (<24 V) applications where MPPT optimization and wide input range are not needed. |
Compared with LTC4000EUFD-1#PBF, the LTC4000IGN-1#PBF offers identical electrical performance but trades thermal efficiency for SSOP manufacturability; versus BQ24650RGER, it delivers superior MPPT accuracy, wider voltage range, and programmable chemistry support at higher design complexity.
Availability
LTC4000IGN-1#PBF is available at Aetrix Electronics and suitable for solar-powered battery charger systems, battery-equipped military portable equipment, and industrial IoT gateways requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC4000IGN-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 healthcare markets.
The LTC4000-1 product line was designed to enable high-efficiency, high-voltage battery charging systems with MPPT capability-specifically targeting renewable energy, portable military, and ruggedized industrial applications where input source impedance and thermal resilience are critical.
FAQ
What is the key functional difference between LTC4000IGN-1#PBF and the standard LTC4000?
The LTC4000IGN-1#PBF replaces the input current regulation loop of the LTC4000 with an input voltage regulation loop, using a precise 1.000 V reference at the IFB pin. This change makes LTC4000IGN-1#PBF better suited for maximum power point tracking (MPPT) in solar applications where maintaining optimal input voltage-not current-is essential for peak efficiency. The LTC4000IGN-1#PBF retains all other core features including battery float regulation, PowerPath™ control, and NTC temperature qualification.
Can LTC4000IGN-1#PBF support lithium-ion batteries with NTC thermistor monitoring?
Yes, LTC4000IGN-1#PBF supports NTC-based temperature qualification for lithium-ion batteries via the NTC pin, which compares thermistor voltage against cold (75% of BIAS) and hot (35% of BIAS) thresholds. Charging and timing functions are suspended outside the safe range. However, the datasheet explicitly states that NTC functionality is validated only for Li-ion chemistries-not LiFePO₄ or lead-acid-so proper thermistor calibration and validation are required for non-Li-ion use.
How does the instant-on feature work in LTC4000IGN-1#PBF, and what is its voltage threshold?
The instant-on feature in LTC4000IGN-1#PBF activates when the OFB pin voltage falls below 86% of the programmed battery float voltage (typically 0.974 V, since VBFB_REG = 1.136 V). At that point, the BGATE driver regulates to maintain OFB at that level, ensuring downstream system power remains valid-even with a 0 V battery. This allows immediate system startup before battery charging begins, and is confirmed by the VOUT(INST_ON) specification of 82–90% of VBFB_REG over temperature.
What are the absolute maximum ratings for the IN and BAT pins of LTC4000IGN-1#PBF?
The absolute maximum rating for both IN and BAT pins of LTC4000IGN-1#PBF is –0.3 V to +62 V relative to GND. This rating applies across all operating conditions and defines the voltage limits beyond which permanent device damage may occur. The recommended operating range remains 3 V to 60 V for both pins, as specified in the Electrical Characteristics table. Exceeding 62 V-even momentarily-risks latch-up or oxide breakdown.
Is LTC4000IGN-1#PBF pin-compatible with LTC4000EGN-1#PBF?
Yes, LTC4000IGN-1#PBF is pin-compatible with LTC4000EGN-1#PBF: both are 28-lead SSOP-packaged variants of the LTC4000-1 family with identical pinout, function mapping, and electrical specifications. The "I" grade (LTC4000IGN-1#PBF) is guaranteed over the full –40°C to +125°C junction temperature range, whereas the "E" grade (LTC4000EGN-1#PBF) is specified from 0°C to +85°C. No PCB layout changes are required when upgrading from E to I grade.
LTC4000IGN-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
LTC4000IGN-1#PBF FAQ
1.How can I place an order for LTC4000IGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000IGN-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 LTC4000IGN-1#PBF reliable?
The price and inventory of LTC4000IGN-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 LTC4000IGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4000IGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000IGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000IGN-1#PBF?
LTC4000IGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000IGN-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 LTC4000IGN-1#PBF?
For technical support, including LTC4000IGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000IGN-1#PBF requirements.
6.How does Aetrix verify that LTC4000IGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4000IGN-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 LTC4000IGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4000IGN-1#PBF?
All LTC4000IGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000IGN-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 LTC4000IGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC4000IGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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