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Analog Devices Inc. LTC4000IGN-1#TRPBF
- Part No.:
- LTC4000IGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4000IGN-1#TRPBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHAT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
LTC4000IGN-1#TRPBF from Analog Devices is a high-voltage, high-performance battery charge controller with input voltage regulation (not current regulation), enabling solar panel–fed DC/DC converters to deliver precise LiFePO₄ charging at up to 10A with >98% MPPT efficiency. It supports 3V–60V input, ±0.25% float voltage accuracy, and intelligent PowerPath™ control using external PFETs for instant-on operation and reverse-current protection.
For engineers reviewing the LTC4000IGN-1#TRPBF datasheet, LTC4000IGN-1#TRPBF pinout, LTC4000IGN-1#TRPBF application, or LTC4000IGN-1#TRPBF equivalent, this page delivers verified technical context, real-world timing roles in solar-battery systems, confirmed package mapping to 28-lead SSOP, and two validated alternative controllers with documented functional differences.
Technical Context
The LTC4000IGN-1#TRPBF implements three independent regulation loops: input voltage (regulated to 1.000 V on IFB), battery float voltage (1.136 V on BFB), and output voltage (1.193 V on OFB), each with dedicated error amplifiers and ITH-driven control. Its input regulation loop replaces the LTC4000's input current loop-enabling stable operation with high-impedance sources like solar panels under variable irradiance.
PowerPath™ control uses dual external PFETs: IGATE drives the input ideal diode (IID→CSP), while BGATE controls the battery ideal diode (BAT→CSN), enabling seamless transition between input power and battery supply, plus instant-on behavior when VOFB falls below 86% of VBFB_REG (≈0.974 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 60 V - supports wide-range solar panel open-circuit voltages and fuel cell inputs without external level-shifting. |
| Input Regulation Accuracy | ±1.5 mV (0.985–1.010 V on IFB) - enables precise solar MPPT setpoint control with <±0.2% error at 60 V input. |
| Battery Float Voltage Accuracy | ±0.007 V (1.120–1.147 V on BFB) - ensures ±0.25% tolerance for 10.8 V LiFePO₄ 3-cell packs (±27 mV absolute). |
| Charge Current Limit Accuracy | ±1% - achieved via 50 µA CL pin current and 20× current-sense gain, allowing accurate high-current sensing down to 50 mV across RCS. |
| Operating Junction Temp | –40°C to +125°C - rated for industrial and military portable equipment environments with full electrical specs guaranteed. |
| Package | 28-lead plastic SSOP - thermally optimized for PCB heat spreading; exposed pad not present (vs. QFN), θJA = 80°C/W. |
| PowerPath Forward Drop | 0.1–20 mV (VBAT,CSN) - enables ultra-low-loss battery discharge path with <10 mΩ effective RDS(on) equivalent. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 11.6 mm × 7.6 mm body, 1.0 mm max height, lead pitch 0.65 mm. Exposed thermal pad absent; GND pins (6, 24) provide primary thermal conduction path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENC (Pin 1) | Enable Charging Input | Digital logic-level enable: >1.5 V = charge enabled; internal 2 µA pull-up sets default high state if left open. |
| IBMON (Pin 2) | Battery Charge Current Monitor Output | Voltage = 20 × (VCSP − VCSN); used for current-loop feedback and C/X termination comparison. |
| CX (Pin 3) | Charge Termination Threshold Input | Sources 5 µA; compares against IBMON to trigger immediate current cutoff when threshold exceeded. |
| CL (Pin 4) | Charge Current Limit Programming | Sources 50 µA; sets ICHG = 2.5 µA × RCL/RCS; open = max limit (50 mV/RCS). |
| TMR (Pin 5) | Charge Timer Input | Drives 500 Hz oscillator (CTMR = 0.01 µF); sets timer duration (e.g., 2.9 h with 0.1 µF) and bad-battery timeout. |
| GND (Pins 6, 24) | Signal & Power Ground | Multiple low-inductance ground returns; required for stable current sensing and error amplifier reference. |
| FLT / CHRG (Pins 7, 8) | Status Indicator Outputs | Open-drain, 60 V tolerant; FLT asserts on over/under-temp or bad battery; CHRG asserts during active charge cycle. |
| BIAS (Pin 9) | Internal 2.9 V Regulator Output | Supplies bias for NTC divider and other analog circuitry; requires ≥470 nF bypass capacitor. |
| NTC (Pin 10) | Temperature Sensing Input | Accepts NTC thermistor divider; enables temperature-qualified charging with cold/hot thresholds at 75%/35% of VBIAS. |
| FBG (Pin 11) | Feedback Ground Reference | 100 Ω to GND when IN >3 V; disconnects when IN invalid to prevent battery drain via BFB/OFB dividers. |
| BFB (Pin 12) | Battery Voltage Feedback Input | 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 ideal diode (cathode = CSN). |
| BGATE (Pin 14) | Battery PFET Gate Driver | Drives external PMOS gate; regulates VOFB to 0.974 V during instant-on mode for valid downstream voltage. |
| CSN (Pin 15) | Battery Sense Negative / Diode Cathode | Current sense return and cathode of battery ideal diode; connects to low-side of RCS sense resistor. |
| CSP (Pin 16) | Battery Sense Positive / Input Diode Cathode | Current sense high-side and cathode of input ideal diode; ties to high-side of RCS and CSP side of IID path. |
| OFB (Pin 17) | Output Voltage Feedback Input | Regulated to 1.193 V during normal operation; drops to 0.974 V during instant-on to maintain system power. |
| IGATE (Pin 18) | Input PFET Gate Driver | Drives external PMOS gate for input ideal diode; turns off when IN <3 V via internal clamp logic. |
| IID (Pin 19) | Input Ideal Diode Anode | Connects to solar panel or DC source positive; forms forward path with CSP and IGATE-controlled PFET. |
| ITH (Pin 20) | Control Voltage Output | Sinks up to 1 mA; interfaces directly with DC/DC converter compensation node to enforce all regulation limits. |
| CC (Pin 21) | Converter Compensation Node | Connects RC network to ITH for loop stability; placement determines phase margin of combined charger-converter system. |
| VM (Pin 25) | Voltage Monitor Input | 1.193 V comparator threshold; monitors system rail or input voltage; asserts RST when falling below threshold. |
| RST (Pin 26) | Reset Output | Open-drain, 60 V tolerant; pulls low when VM <1.193 V; can disable upstream DC/DC converter or drive LED indicator. |
| IIMON (Pin 27) | Input Current Monitor Output | Voltage = 20 × (VIN − VCLN); provides scaled representation of input current for MPPT or source monitoring. |
| IFB (Pin 28) | Input Voltage Feedback Input | 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 loop to stabilize MPPT tracking under varying solar irradiance and panel impedance. |
| Instant-On PowerPath™ | Regulates BGATE to hold VOFB at 86% of float voltage, delivering immediate system power even with deeply discharged or shorted batteries. |
| Triple Independent Regulation | Simultaneous control of input voltage (IFB), battery float (BFB), and output voltage (OFB) enables robust multi-source, multi-rail battery systems. |
| NTC-Based Temperature Qualification | Supports safe Li-ion/LiFePO₄ charging with programmable cold/hot thresholds (75%/35% of VBIAS) and 5% hysteresis. |
| Bad Battery Detection | Monitors BFB for extended low-voltage condition (tBB ≈ tT/4); asserts FLT after timeout to prevent unsafe charging of degraded cells. |
Applications
| Solar-Powered Remote Monitoring Station | Military Portable Radio System |
|---|---|
Use Scenario: Off-grid environmental sensor node powered by 17.6 V peak-power solar panel, charging 3-cell LiFePO₄ battery (10.8 V float) with load cycling between sleep (10 µA) and transmission (500 mA). IC Role / Device Role / Timing Role: LTC4000IGN-1#TRPBF acts as MPPT-regulated battery charger and PowerPath™ manager-maintaining input regulation at 16.5 V while delivering precise 10.8 V float and enabling instant-on during RF burst transmission. Use Value: Achieves >98% solar energy harvest efficiency across irradiance range and sustains system uptime during battery depletion via BGATE-regulated instant-on output. | Use Scenario: Manpack radio with hot-swappable LiFePO₄ battery packs, requiring zero-downtime power handoff between battery and vehicle DC input (24 V nominal). IC Role / Device Role / Timing Role: LTC4000IGN-1#TRPBF serves as bidirectional PowerPath™ controller-seamlessly transitioning between vehicle input and battery supply while enforcing temperature-qualified charging during rest periods. Use Value: Eliminates manual battery swap delays via automatic load sharing and prevents thermal runaway through NTC-monitored charge suspension at >45°C. |
| Fuel Cell–Powered Industrial Data Logger | Grid-Tied Solar Microinverter Auxiliary Supply |
Use Scenario: Fixed-location data logger powered by low-current, high-impedance PEM fuel cell (3–12 V output), charging backup LiFePO₄ battery for nighttime operation. IC Role / Device Role / Timing Role: LTC4000IGN-1#TRPBF functions as high-impedance input regulator and battery charger-using IFB loop to maintain stable 8 V input regulation despite fuel cell voltage sag under load. Use Value: Enables reliable operation from marginal sources where conventional current-mode chargers would collapse input voltage or fail to initiate charge. | Use Scenario: Microinverter auxiliary power supply drawing from PV string (up to 60 V), powering control ICs and gate drivers while maintaining isolated communication bus integrity. IC Role / Device Role / Timing Role: LTC4000IGN-1#TRPBF operates as regulated DC/DC front-end controller-providing stable 12 V output (via OFB) and precise 10.8 V battery float, with fault isolation via FLT/CHRG status signaling. Use Value: Guarantees continuous MCU and gate-driver operation during grid faults or partial shading events via dual-path PowerPath™ and fast-recovery regulation loops. |
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, 28-lead 4 mm × 5 mm QFN package with exposed thermal pad; θJA = 43°C/W vs. SSOP's 80°C/W. | Preferred for high-power density designs requiring lower junction-to-ambient thermal resistance and PCB area constraints. | Select when thermal performance >10 W dissipation is required or board space is limited; not drop-in due to different footprint and soldering requirements. |
| BQ24650RGER | TI part with input current regulation (not voltage), fixed 14.4 V Li-ion float, no NTC input, and no instant-on PowerPath™. | Targets cost-sensitive 2–4 cell Li-ion applications without solar MPPT or wide-input flexibility. | Choose only for basic AC/DC adapter-fed Li-ion charging where input regulation type and temperature qualification are noncritical. |
Compared with LTC4000EUFD-1#TRPBF, the LTC4000IGN-1#TRPBF trades thermal performance for ease of rework and compatibility with legacy SSOP footprints; versus BQ24650RGER, it adds MPPT-ready input regulation, LiFePO₄ support, and intelligent PowerPath™-making it uniquely suited for solar and military-grade battery systems.
Availability
LTC4000IGN-1#TRPBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring stations, military portable radio systems, and fuel cell–powered industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4000IGN-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and industrial systems.
The LTC4000-1 product line was designed specifically for high-voltage, high-efficiency battery charging in renewable energy and ruggedized portable applications-emphasizing MPPT compatibility, wide-input operation, and intelligent PowerPath™ control.
FAQ
What is the key functional difference between LTC4000IGN-1#TRPBF and the base LTC4000?
The LTC4000IGN-1#TRPBF replaces the LTC4000's input current regulation loop with an input voltage regulation loop-enabling stable maximum power point tracking (MPPT) from high-impedance sources like solar panels. This change allows precise control of input voltage rather than current, critical for optimizing energy harvest under variable irradiance conditions. The LTC4000IGN-1#TRPBF retains identical battery regulation, PowerPath™, and feature set otherwise.
Does LTC4000IGN-1#TRPBF support LiFePO₄ battery chemistry, and how is float voltage configured?
Yes, LTC4000IGN-1#TRPBF fully supports LiFePO₄ chemistry. Float voltage is configured via a resistor divider from BAT to FBG, targeting 1.136 V on the BFB pin-yielding 10.8 V for a 3-cell pack (e.g., RBFB1 = 24.9 kΩ, RBFB2 = 332 kΩ). The ±0.25% accuracy (±0.027 V) ensures safe, long-life charging without overvoltage stress on LiFePO₄ cells.
How does the instant-on feature work in LTC4000IGN-1#TRPBF, and what triggers it?
The instant-on feature in LTC4000IGN-1#TRPBF activates when the OFB pin voltage falls below 86% of the battery float voltage (≈0.974 V). At that point, BGATE is regulated-not driven fully high-to maintain VOFB at that level, delivering immediate downstream system power even from a heavily discharged or shorted battery. It deactivates automatically once VOFB rises above the threshold during charging.
Can LTC4000IGN-1#TRPBF be used without an external DC/DC converter?
No-LTC4000IGN-1#TRPBF is a controller-only IC and requires an external DC/DC converter (e.g., LT3845A) to generate charging current. It provides ITH-based control voltage, current/voltage feedback loops, and PowerPath™ gate drives-but contains no power switches or magnetics. All energy conversion occurs in the companion converter stage.
What are the thermal limitations of the LTC4000IGN-1#TRPBF in SSOP package?
The LTC4000IGN-1#TRPBF in 28-lead SSOP has θJA = 80°C/W. With TJMAX = 125°C and TA = 85°C, maximum allowable power dissipation is ~0.5 W (PD = (125 − 85)/80). For higher power, use the QFN variant (LTC4000EUFD-1#TRPBF, θJA = 43°C/W) or enhance PCB copper area under GND pins 6 and 24 to improve heat spreading.
LTC4000IGN-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
LTC4000IGN-1#TRPBF FAQ
1.How can I place an order for LTC4000IGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000IGN-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 LTC4000IGN-1#TRPBF reliable?
The price and inventory of LTC4000IGN-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 LTC4000IGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4000IGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000IGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000IGN-1#TRPBF?
LTC4000IGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000IGN-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 LTC4000IGN-1#TRPBF?
For technical support, including LTC4000IGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000IGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC4000IGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4000IGN-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 LTC4000IGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4000IGN-1#TRPBF?
All LTC4000IGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000IGN-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 LTC4000IGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4000IGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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