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Analog Devices Inc. LTC4000IGN#TRPBF
- Part No.:
- LTC4000IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4000IGN#TRPBF.pdf
- Description:
- IC BATT CHG IRON PHOSPHAT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
LTC4000IGN#TRPBF 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 and output ranges, 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#TRPBF datasheet, LTC4000IGN#TRPBF pinout, LTC4000IGN#TRPBF application, or LTC4000IGN#TRPBF equivalent, key selection criteria include its dual ideal diode control (input and battery), NTC-based temperature qualification, C/X or timer-based charge termination, and compatibility with buck, boost, or buck-boost converter topologies for scalable high-power charging systems.
Technical Context
The LTC4000IGN#TRPBF implements four independent regulation loops-input current, battery charge current, battery float voltage, and output voltage-each feeding into a shared high-impedance ITH control node that interfaces with external DC/DC converter compensation networks. Its PowerPath architecture uses two external PFETs: one for low-loss reverse-blocking at the input (IID→CSP path), another for bidirectional battery power management (BAT↔CSN path) enabling seamless switchover and instant-on functionality.
It integrates precision current sensing with 20× gain and <±300 µV offset, programmable thresholds for recharge (97.6% of VBFB_REG), low-battery detection (68% of VBFB_REG), and instant-on activation (86% of VBFB_REG). All critical thresholds-including NTC cold/hot limits (75%/35% of VBIAS) and CX comparator hysteresis (5 mV)-are specified over –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and telecom inputs without pre-regulation. |
| Battery Float Voltage Accuracy | ±0.25% - ensures tight cell voltage control for LiFePO₄ (e.g., 10.8V ±27 mV for 3-cell pack) to maximize cycle life and safety. |
| Charge Current Limit Accuracy | ±1% - enables precise high-current regulation up to 10A+ using external sense resistors and 20× gain monitoring. |
| PowerPath Instant-On Threshold | 86% of float voltage (typ.) - guarantees immediate system power delivery even when battery voltage drops to ~9.3V for a 10.8V pack. |
| NTC Temperature Qualification | Cold threshold: 75% VBIAS; Hot threshold: 35% VBIAS - provides robust, resistor-programmable thermal cutoff for safe charging across –40°C to +85°C ambient. |
| Operating Junction Temp | –40°C to 125°C - rated for harsh environments including industrial battery packs and portable test equipment. |
| Package Type | 28-lead SSOP - surface-mount package with exposed thermal pad (QFN variant also available; this part is SSOP). |
Pinout & Package
The LTC4000IGN#TRPBF is housed in a 28-lead plastic SSOP package (GN), with pins 1–14 on top row and 15–28 on bottom row. Exposed thermal pad is not present in SSOP; thermal performance relies on PCB copper area under body. Pin 6 (IBMON) and Pin 27 (IIMON) provide 20× amplified battery/input current sense outputs; Pin 13 (BIAS) supplies a regulated 2.9V reference for NTC biasing and divider networks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENC (Pin 1) | Enable Charging Input | Digital logic-level enable: >1.5V = active charge mode; internal 2µA pull-up defaults to enabled if left open. |
| IL (Pin 4) | Input Current Limit Programming | Sources 50µA to set input current limit via RIL; regulates VIN–CLN sense voltage to 50mV/RIS max. |
| CL (Pin 8) | Charge Current Limit Programming | Sources 50µA to set battery charge current limit via RCL; regulates VCSP–CSN sense voltage to 50mV/RCS max. |
| BAT (Pin 13) | Battery Anode Connection | Anode terminal of battery ideal diode; connects directly to positive terminal of LiFePO₄ or Li-ion pack. |
| CSN (Pin 15) | Battery Sense Negative / Diode Cathode | Negative side of battery current sense resistor; also cathode of battery ideal diode (BAT→CSN conduction path). |
| OFB (Pin 17) | Output Feedback Voltage Input | High-Z input for output voltage regulation; sets VOUT = 1.193V × (RO1+RO2)/RO2; drops to 0.974V during instant-on. |
| IGATE (Pin 18) | Input PFET Gate Driver | Drives external PMOS for input ideal diode (IID→CSP); clamped to 13–15V to ensure full enhancement of high-VGS FETs. |
| BGATE (Pin 14) | Battery PFET Gate Driver | Controls battery ideal diode (BAT→CSN) and regulates OFB to 0.974V during instant-on; clamp voltage 13–15V. |
| ITH (Pin 20) | Control Voltage Output | High-impedance node sinking up to 1mA; interfaces directly with DC/DC converter compensation network (e.g., LT3845A). |
| CC (Pin 21) | Converter Compensation | Connects RC network to ITH for loop stability; defines phase margin and transient response of combined charger-converter system. |
Key Features
| Feature | Design Value |
|---|---|
| Intelligent PowerPath™ Control | Two independent PFET drivers (IGATE/BGATE) enable lossless input reverse blocking, battery discharging, and instant-on switchover without MOSFET gate driver ICs. |
| Accurate Programmable Float Voltage | ±0.25% tolerance over –40°C to 125°C ensures reliable LiFePO₄ cell balancing and prevents overvoltage stress in multi-cell packs. |
| Temperature-Qualified Charging | NTC input with programmable cold/hot thresholds (75%/35% VBIAS) suspends charging outside safe thermal zones-no external ADC or microcontroller required. |
| C/X or Timer-Based Termination | Configurable termination: C/10 trickle charge (RCX = RCL ≤19.1kΩ) or adjustable timer (2.3–3.5h with 0.1µF capacitor) for optimal capacity utilization. |
| Bad Battery Detection | Monitors BFB voltage during charge; asserts FLT after tBB = tT/4 if VBFB remains below low-battery threshold-prevents charging faulty or shorted cells. |
Applications
| Portable Test Equipment | Industrial Backup Power Systems |
|---|---|
|
Use Scenario: Handheld multimeters and oscilloscopes requiring uninterrupted operation during AC power loss and fast recharge from wall adapter or USB-PD source. IC Role / Device Role / Timing Role: LTC4000IGN#TRPBF manages dual-path power (input vs. battery), regulates 3-cell LiFePO₄ pack at 10.8V, and enables instant-on from <9.5V battery voltage. Use Value: Eliminates brownouts during hot-swap; extends runtime via precise 10A charge current control and low-quiescent 10–20µA battery-only mode. |
Use Scenario: Rack-mounted PLCs and remote I/O modules with integrated 24V LiFePO₄ backup battery, powered from 48V DC distribution bus. IC Role / Device Role / Timing Role: LTC4000IGN#TRPBF acts as high-voltage battery manager, regulating charge from 48V input while maintaining isolated 24V system rail via external buck converter. Use Value: Supports 60V max input for industrial bus compliance; NTC qualification prevents thermal runaway in enclosed enclosures; PowerPath ensures zero-downtime failover. |
| Notebook/Subnotebook Computers | High-Performance Portable Instruments |
|
Use Scenario: Ultra-thin subnotebooks using 3-cell LiFePO₄ (10.8V) with USB-C PD input and requirement for rapid charge + system power priority. IC Role / Device Role / Timing Role: LTC4000IGN#TRPBF coordinates input current sharing between system load and battery, enforces 10A max charge, and maintains VOUT during deep discharge via BGATE regulation. Use Value: Enables "always-on" UX with no boot delay; ±1% current accuracy allows predictable charge time estimation; SSOP package fits constrained board space. |
Use Scenario: Field-deployable spectrum analyzers and signal generators needing ruggedized 28V Li-ion packs and 100W+ charging from vehicle or generator sources. IC Role / Device Role / Timing Role: LTC4000IGN#TRPBF serves as front-end controller for high-efficiency synchronous buck converter (e.g., LT3845A), managing 15A+ charge profiles and battery health monitoring. Use Value: Wide 3–60V input accommodates 12V/24V/48V vehicle systems; ±0.25% float voltage preserves battery longevity over 500+ cycles; fault pins (CHRG/FLT) feed into host MCU for diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#TRPBF | Integrated 2A synchronous buck charger; fixed 4.2V/8.4V/12.6V float; no PowerPath or instant-on; max 32V input. | Best for compact single-cell or 2-cell Li-ion designs where external PFET control and wide input range are unnecessary. | Select LTC4000IGN#TRPBF when system requires >2A charge current, >32V input, or seamless input/battery switchover. |
| BQ24610RGER | TI standalone 3–28V battery charger controller; supports NTC, C/V termination, but lacks dual ideal diode control and instant-on capability. | Suitable for cost-sensitive industrial chargers where PowerPath functionality is not required and input voltage stays below 28V. | Choose LTC4000IGN#TRPBF for designs demanding >28V input, true bidirectional battery power management, or guaranteed instant-on below 9V. |
Compared with LT3652IMSE#TRPBF and BQ24610RGER, the LTC4000IGN#TRPBF uniquely delivers programmable high-voltage PowerPath control, ±0.25% float accuracy over full temperature range, and instant-on operation-making it the only option for 48V-input, high-reliability LiFePO₄ systems requiring zero-downtime switchover and field-serviceable battery packs.
Availability
LTC4000IGN#TRPBF is available at Aetrix Electronics and suitable for industrial backup power systems, portable test equipment, and notebook/subnotebook computers requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC4000IGN#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear parts including the LTC4000 series.
The LTC4000IGN#TRPBF belongs to Linear's high-performance battery management portfolio, designed specifically for high-voltage, high-current charging systems where precision, reliability, and intelligent power routing are critical-such as medical portables, military radios, and industrial UPS modules.
FAQ
What is the operating temperature range for the LTC4000IGN#TRPBF?
The LTC4000IGN#TRPBF is rated for an operating junction temperature range of –40°C to 125°C. This specification is guaranteed for the "I" grade (industrial), and the SSOP package (GN) used in LTC4000IGN#TRPBF meets this rating with θJA = 80°C/W. All key parameters-including float voltage accuracy, current regulation, and NTC thresholds-are characterized across this full range.
Does the LTC4000IGN#TRPBF integrate power switches or require external MOSFETs?
The LTC4000IGN#TRPBF does not integrate any power switches. It requires two external P-channel MOSFETs: one driven by IGATE for input ideal diode control (IID→CSP), and another driven by BGATE for battery ideal diode and charging path control (BAT↔CSN). This architecture enables scalable current handling (10A+), low conduction loss, and thermal separation from the controller IC.
How does the LTC4000IGN#TRPBF implement instant-on functionality with a deeply discharged battery?
The LTC4000IGN#TRPBF monitors the OFB pin and, when VOFB falls below 86% of the programmed float voltage (e.g., <9.3V for a 10.8V pack), regulates BGATE to maintain VOFB at 0.974V. This forces the external battery PFET into linear mode, delivering regulated output voltage to downstream loads-even before the battery reaches full charge-ensuring no system boot interruption.
Can the LTC4000IGN#TRPBF be used with lithium iron phosphate (LiFePO₄) batteries?
Yes, the LTC4000IGN#TRPBF is explicitly validated for LiFePO₄ chemistries. Its ±0.25% float voltage accuracy, programmable 10.8V (3-cell) or 14.4V (4-cell) regulation, C/10 trickle charge for recovery, and NTC-based temperature qualification make it ideal for LiFePO₄ packs. The typical application circuit in the datasheet shows a 3-cell LiFePO₄ configuration with 10A charge current.
What is the purpose of the ITH pin on the LTC4000IGN#TRPBF?
The ITH pin on the LTC4000IGN#TRPBF is a high-impedance control voltage node that sinks current (up to 1mA) when any regulation loop-input current, charge current, battery voltage, or output voltage-reaches its limit. It directly interfaces with the compensation node of an external DC/DC converter (e.g., LT3845A), enabling unified loop control without additional op-amps or isolation components.
LTC4000IGN#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#TRPBF FAQ
1.How can I place an order for LTC4000IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4000IGN#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#TRPBF reliable?
The price and inventory of LTC4000IGN#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4000IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4000IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4000IGN#TRPBF?
LTC4000IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4000IGN#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#TRPBF?
For technical support, including LTC4000IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4000IGN#TRPBF requirements.
6.How does Aetrix verify that LTC4000IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4000IGN#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4000IGN#TRPBF?
All LTC4000IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4000IGN#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC4000IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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