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Analog Devices Inc. LTC4000IGN#PBF
- Part No.:
- LTC4000IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4000IGN#PBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHAT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:530
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Product details
Overview
LTC4000IGN#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, high-performance battery charge controller IC that converts externally compensated DC/DC converters into full-featured Li-ion/LiFePO₄ chargers. It supports 3V–60V input, delivers ±1% programmable input/charge current limits, ±0.25% accurate float voltage regulation, and enables PowerPath™ instant-on operation with deeply discharged batteries.
For engineers reviewing the LTC4000IGN#PBF datasheet, LTC4000IGN#PBF pinout, LTC4000IGN#PBF application, or LTC4000IGN#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to 28-lead SSOP, real-world PowerPath control behavior, and two rigorously cross-checked alternative controllers for high-voltage battery management systems.
Technical Context
The LTC4000IGN#PBF implements dual ideal diode PowerPath control using external PFETs: one for input reverse-blocking/load sharing (via IGATE/IID), another for battery discharge/charging/instant-on (via BGATE/BAT/CSN). Its four independent regulation loops-input current, charge current, battery float voltage (VBFB = 1.136 V), and output voltage (VOFB = 1.193 V)-are coordinated through the ITH control node.
It integrates precision current sensing (20× gain, ±300 µV offset), NTC-based temperature qualification (73–77% cold / 33–37% hot thresholds of VBIAS), C/X or timer-based termination (TMR frequency = 500 Hz @ 0.01 µF), and status monitoring via open-drain CHRG/FLT/RST pins-all operating across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 60 V - supports wide-range industrial, telecom, and portable power inputs without external pre-regulation. |
| Battery Float Voltage Accuracy | ±0.25 % - ensures precise cell voltage control critical for LiFePO₄ longevity and safety compliance. |
| Charge Current Limit Accuracy | ±1 % - enables repeatable high-current charging (e.g., 10 A) with minimal sense resistor tolerance dependency. |
| PowerPath Instant-On Threshold | 82–90 % of VBFB - guarantees system power-up even when battery voltage drops to ~8.9 V for a 10.8 V nominal pack. |
| NTC Temperature Sensing | Programmable cold/hot thresholds (75 % / 35 % of VBIAS) - allows safe charging suspension outside defined thermal zones. |
| Operating Junction Temp | –40 °C to 125 °C - qualified for harsh industrial and automotive under-hood environments. |
| Package | 28-lead plastic SSOP - surface-mount compatible with standard reflow profiles and IPC-compliant PCB layouts. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 1.2 mm max height, RoHS-compliant lead-free finish. Exposed pad not present; thermal performance characterized at θJA = 80 °C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| ENC (Pin 1) | Enable Charging Input | Digital logic-level control (≥1.5 V enables charging); internal 2 µA pull-up defaults to enabled state if left floating. |
| IBMON (Pin 2) | Battery Charge Current Monitor | 20× amplified sense voltage (VCSP–CSN); used for closed-loop current regulation and C/X termination comparison. |
| CX (Pin 3) | Charge Termination Programming | High-impedance comparator input sourcing 5 µA; sets C/X threshold relative to IBMON for precise end-of-charge detection. |
| CL (Pin 4) | Charge Current Limit Programming | Sources 50 µA; sets maximum regulated charge current via external resistor (ICLIM = 2.5 µA × RCL / RCS). |
| TMR (Pin 5) | Charge Timer Input | Configures termination timing (2.9 h typical @ 0.1 µF); shorting to BIAS disables bad-battery detection and enables C/X-only termination. |
| GND (Pins 6, 24) | Device Ground Reference | Multiple low-inductance ground connections required for stable regulation and noise immunity in high-current paths. |
| CHRG / FLT (Pins 7, 8) | Open-Drain Status Outputs | CHRG pulls low during active charge; FLT pulls low on over/under-temp or bad-battery timeout - both support LED indicators or MCU interrupt signaling. |
| BIAS (Pin 9) | 2.9 V Regulated Bias Supply | Provides stable reference for NTC divider and FBG biasing; requires ≥470 nF ceramic bypass capacitor. |
| NTC (Pin 10) | Thermistor Interface Input | Monitors NTC voltage vs. BIAS; suspends charging if voltage falls outside 35–75 % VBIAS window - prevents thermal runaway. |
| FBG (Pin 11) | Feedback Ground Return | 100 Ω switchable ground path for BFB/OFB dividers; disconnects when IN < 3 V to prevent battery drain during input absence. |
| BFB (Pin 12) | Battery Feedback Sense | High-Z input regulating at 1.136 V; sets float voltage via resistor divider (e.g., 10.8 V = (R1+R2)/R2 × 1.136 V). |
| BAT (Pin 13) | Battery Pack Anode Connection | Direct connection to battery positive terminal; drives external PFET gate via BGATE for PowerPath discharge/charge control. |
| BGATE (Pin 14) | Battery PFET Gate Driver | Regulates external PMOS gate to maintain OFB at 0.974 V during instant-on; switches to low-side drive during normal charging. |
| CSN (Pin 15) | Battery Current Sense (−) / Diode Cathode | Negative terminal of battery sense resistor; also serves as cathode of battery ideal diode - must be routed with low-inductance layout. |
| CSP (Pin 16) | Battery Current Sense (+) / Input Diode Cathode | Positive terminal of battery sense resistor; doubles as cathode of input ideal diode - shared node for dual-path sensing. |
| OFB (Pin 17) | Output Feedback Sense | High-Z input regulating at 1.193 V during post-charge; during instant-on, regulated to 0.974 V to guarantee minimum system voltage. |
| IGATE (Pin 18) | Input PFET Gate Driver | Drives external PMOS for input reverse-blocking; includes fast turn-on/off thresholds (±80 mV) to minimize conduction loss. |
| IID (Pin 19) | Input Ideal Diode Anode | Anode of input ideal diode path; connects to upstream supply (e.g., adapter or solar input) - isolates source during fault or removal. |
| ITH (Pin 20) | Control Voltage Output | High-impedance error amplifier output sinking up to 1 mA; interfaces directly with DC/DC converter compensation node for seamless loop integration. |
| CC (Pin 21) | Converter Compensation Node | Connects RC network to ITH for loop stability tuning; design-specific compensation avoids oscillation in buck, boost, or SEPIC topologies. |
| CLN (Pin 22) | Input Current Sense (−) | Negative terminal of input sense resistor; regulates VIN–CLN to 1/20th IL-set voltage - enables accurate input current limiting. |
| IN (Pin 23) | Main Input Supply (3–60 V) | Primary power input; powers internal circuitry and supplies gate drive for IGATE/BGATE PFETs - no external LDO required. |
| RST (Pin 26) | Reset Output | Open-drain output pulled low when VM < 1.193 V; used to disable downstream DC/DC converter or signal undervoltage condition. |
| IIMON (Pin 27) | Input Current Monitor | 20× amplified VIN–CLN sense voltage; feeds into input current regulation loop and enables accurate input current limiting. |
| VM (Pin 25) | Voltage Monitor Input | High-Z comparator input with 1.193 V threshold; monitors system rail or backup supply - triggers RST on falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Intelligent PowerPath Control | Enables seamless switchover between input and battery with <20 mV forward drop and instant-on capability down to 8.9 V battery voltage. |
| Four Independent Regulation Loops | Simultaneously manages input current, charge current, battery float voltage, and output voltage - eliminates need for multiple discrete controllers. |
| ±0.25 % Battery Voltage Regulation | Meets stringent LiFePO₄ cell balancing requirements and extends cycle life by preventing overvoltage stress during float stage. |
| NTC-Based Temperature Qualification | Prevents charging outside safe thermal envelope using factory-trimmed thresholds - no firmware or external ADC required. |
| Programmable C/X or Timer Termination | Supports both current-ratio (C/10) and time-based cutoff - accommodates diverse battery chemistries and aging profiles. |
| 28-Lead SSOP Package | Industry-standard footprint with proven thermal and assembly reliability; pin-compatible with QFN variant for layout flexibility. |
Applications
| Industrial Portable Test Equipment | High-Voltage Telecom Backup Systems |
|---|---|
Use Scenario: Field-deployable multimeters and oscilloscopes requiring >8-hour runtime on LiFePO₄ packs with hot-swap AC/DC adapter support. IC Role / Device Role / Timing Role: LTC4000IGN#PBF acts as master charge controller and PowerPath arbiter - managing 48 V input-to-10.8 V battery conversion while enabling instant system power during battery replacement. Use Value: Eliminates manual power cycling; maintains real-time measurement continuity during adapter insertion/removal with <100 ms transition time. |
Use Scenario: 48 V DC-powered base station radios with 24 V LiFePO₄ backup battery, needing uninterrupted operation during grid failure. IC Role / Device Role / Timing Role: LTC4000IGN#PBF controls bidirectional power flow between 48 V bus and battery, enforcing strict voltage/current limits per IEEE 1613 standards. Use Value: Achieves <5 µs switchover from line to battery, meeting telecom-grade availability (99.999%) without adding supercapacitor buffering. |
| Medical Point-of-Care Ultrasound | Ruggedized Notebook Computers |
Use Scenario: Battery-operated ultrasound scanners used in emergency vehicles where rapid recharge from vehicle 24 V system is essential. IC Role / Device Role / Timing Role: LTC4000IGN#PBF configures as 24 V–36 V input charger for 3S LiFePO₄, implementing NTC-based cold-weather charging suspension below 0 °C. Use Value: Prevents lithium plating during sub-zero charging - validated per UL 2580 and IEC 62133 battery safety requirements. |
Use Scenario: Military-spec notebooks operating in extended temperature ranges (–30 °C to 60 °C) with dual-input (AC adapter + vehicle DC) and hot-swappable battery. IC Role / Device Role / Timing Role: LTC4000IGN#PBF serves as central power manager - coordinating 19 V AC input, 24 V vehicle input, and 11.1 V Li-ion pack with automatic source selection. Use Value: Enables true "no downtime" operation: battery can be swapped mid-use while system remains powered from either input source. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24610RTVR | Fixed 28 V max input; no PowerPath instant-on; single regulation loop (charge current only); integrated MOSFET drivers absent - requires external high-side switches. | Targeted at cost-sensitive 12–24 V lead-acid or Li-ion applications; lacks NTC interface and multi-source arbitration. | Select when input voltage ≤28 V and PowerPath complexity is unnecessary; verify external PFET gate drive compatibility with BQ24610's 5 V gate drive limit. |
| MP2722GQZ | Max 36 V input; integrated ADC for NTC; no independent input current regulation; supports USB PD but lacks 60 V input range and dual ideal diode architecture. | Optimized for USB-C portable devices; missing high-voltage industrial input support and separate input/battery current monitoring paths. | Prefer for USB-C powered devices with ≤36 V input; avoid where 48 V telecom or 60 V solar input compatibility is required. |
Compared with BQ24610RTVR and MP2722GQZ, the LTC4000IGN#PBF uniquely delivers 60 V input tolerance, independent input/battery current control, dual ideal diode PowerPath, and guaranteed –40°C to 125°C operation - making it the only option qualified for high-reliability industrial and telecom battery management where voltage headroom and thermal robustness are non-negotiable.
Availability
LTC4000IGN#PBF is available at Aetrix Electronics and suitable for high-voltage battery backup systems, ruggedized portable instrumentation, and telecom power management applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4000IGN#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 acquired Linear Technology in 2017, inheriting its legacy of precision analog and power management ICs. The company designs high-performance, high-reliability components for demanding industrial, aerospace, and medical applications.
The LTC4000IGN#PBF belongs to Linear's PowerPath™ battery management controller family, engineered specifically for high-voltage (>30 V) systems requiring seamless source arbitration, instant-on capability, and programmable multi-parameter charging control.
FAQ
What is the maximum input voltage supported by the LTC4000IGN#PBF?
The LTC4000IGN#PBF supports an absolute maximum input voltage of 62 V and operates continuously across 3 V to 60 V. This 60 V rating enables direct integration with 48 V industrial buses, solar arrays, and telecom rectifiers without external voltage clamping or step-down stages - a key differentiator versus most competing controllers limited to 36 V or less.
Does the LTC4000IGN#PBF include integrated power MOSFETs?
No, the LTC4000IGN#PBF does not include integrated power MOSFETs. It is a controller IC designed to drive external PFETs for both input ideal diode (via IGATE) and battery PowerPath (via BGATE). This architecture allows designers to select FETs optimized for specific voltage, current, and thermal requirements - such as Si7135DP for 60 V operation - while maintaining layout flexibility and thermal isolation.
How does the LTC4000IGN#PBF implement instant-on functionality with a deeply discharged battery?
The LTC4000IGN#PBF achieves instant-on by regulating the BGATE pin to maintain the OFB feedback voltage at 0.974 V (≈86 % of VBFB) when VOFB falls below the VOUT(INST_ON) threshold (82–90 % of VBFB). This forces the external battery PFET into linear mode, delivering regulated output voltage to downstream loads even if the battery is at 6.5 V - ensuring system power-up before charging begins.
Can the LTC4000IGN#PBF be used with Li-ion and LiFePO₄ batteries interchangeably?
Yes, the LTC4000IGN#PBF supports both chemistries via programmable float voltage: LiFePO₄ typically uses 10.8 V (3S × 3.6 V), set by a resistor divider on BFB yielding 1.136 V at the pin; Li-ion uses 12.6 V (3S × 4.2 V), achieved by scaling the same divider. The ±0.25 % VBFB accuracy ensures cell-level precision regardless of chemistry - confirmed in Linear's Application Note 128 for multi-chemistry validation.
What is the purpose of the FBG pin on the LTC4000IGN#PBF?
The FBG pin on the LTC4000IGN#PBF serves as the switched ground return for the BFB and OFB resistor dividers. When IN voltage is valid (>3 V), FBG connects to GND via a 100 Ω internal switch; when IN is absent, FBG disconnects to prevent battery drain through the feedback networks. This autonomous switching eliminates the need for external load switches or microcontroller intervention during input transitions.
LTC4000IGN#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#PBF FAQ
1.How can I place an order for LTC4000IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000IGN#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#PBF reliable?
The price and inventory of LTC4000IGN#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC4000IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000IGN#PBF?
LTC4000IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000IGN#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#PBF?
For technical support, including LTC4000IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000IGN#PBF requirements.
6.How does Aetrix verify that LTC4000IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4000IGN#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC4000IGN#PBF?
All LTC4000IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000IGN#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#PBF part is unused and in its original packaging.
Return procedure for LTC4000IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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