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Analog Devices Inc. LTC4008EGN#TRPBF
- Part No.:
- LTC4008EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4008EGN#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
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Product details
Overview
LTC4008EGN#TRPBF from Analog Devices is a synchronous, constant-current/constant-voltage battery charger controller for Li-ion, Li-polymer, and other multi-chemistry batteries. It delivers up to 4A charge current with ±0.8% voltage accuracy, 96% peak efficiency, and supports 3V–28V output voltage range. Designed for notebook computers and portable instruments, it integrates thermistor-based temperature qualification, AC adapter current limiting, and dual MOSFET gate drivers (TGATE/BGATE) in a 20-pin narrow SSOP package.
For engineers reviewing the LTC4008EGN#TRPBF datasheet, LTC4008EGN#TRPBF pinout, LTC4008EGN#TRPBF application, or LTC4008EGN#TRPBF equivalent, key selection criteria include its ±4% charge current accuracy, 300 kHz nominal switching frequency, 98% maximum duty cycle, thermistor input (NTC), and integrated input FET driver (INFET) - all validated for high-efficiency buck-based charging systems requiring precise thermal management and input current regulation.
Technical Context
The LTC4008EGN#TRPBF employs a synchronous, quasi-constant-frequency, constant-off-time current-mode PWM architecture that avoids audible noise even with ceramic capacitors. Its inner loop uses ITH voltage to regulate peak inductor current, while outer loops manage voltage (via VFB/BATMON divider) and input current (via CLP/CLN amplifier with 100 mV threshold).
It integrates dedicated circuitry for thermistor sampling (RT-controlled timing), C/10 detection (FLAG latching at ~400 mV PROG), and fault handling (FAULT active-low on NTC violation). The INFET driver enables reverse-current protection and AC-present indication, distinguishing it from the LTC4008EGN-1 variant which omits this function.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current Accuracy | ±4% typical - ensures precise battery current control without external calibration |
| Voltage Accuracy | ±0.8% over temperature - guarantees tight float voltage regulation critical for Li-ion cell longevity |
| Switching Frequency | 255–345 kHz - enables compact magnetics and low EMI in portable designs |
| Max Duty Cycle | 98% - supports high VIN-to-VBAT ratios (e.g., 24V input → 12.6V battery) with minimal dropout loss |
| Input Voltage Range | 6V to 28V - accommodates wide-range AC adapters and industrial power supplies |
| Thermistor Interface | Dedicated NTC pin with programmable sampling via RT resistor - enables safe, temperature-qualified charging per JEITA standards |
| Gate Drivers | TGATE (PMOS) and BGATE (NMOS) outputs - directly drive external power FETs without level-shifting components |
Pinout & Package
Package: 20-lead narrow plastic SSOP (GN), RoHS-compliant, –40°C to 125°C operating junction temperature, θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (1) | Primary DC input supply | Accepts 6–28V; powers internal circuitry and CLP rail; bypass required ≥0.01 µF |
| ICL (2) | Input current limit indicator | Active-low open-drain flag signaling when charging current is reduced by CLP/CLN limiting |
| ACP/SHDN (3) | AC present / shutdown control | Open-drain output indicating adapter presence; also serves as enable/shutdown input (≤1 V disables) |
| RT (4) | Thermistor clock resistor | Connects to 150 kΩ (typ.) to set NTC sampling interval; mandatory for startup |
| FAULT (5) | Thermal fault indicator | Active-low open-drain output asserting when NTC detects unsafe battery temperature |
| GND (6) | Analog/digital ground reference | Low-power ground return; separate from PGND to minimize noise coupling |
| VFB (7) | Voltage feedback input | Connects to BATMON divider; sets final float voltage using internal 1.19 V reference |
| NTC (8) | Thermistor network input | Monitors battery temperature via external NTC; suspends charging if out-of-range |
| ITH (9) | Current mode control node | Inner-loop compensation point; voltage determines peak inductor current magnitude |
| PROG (10) | Charge current programming/monitoring | Resistor-to-ground sets full-scale current; voltage linearly tracks real-time charge current |
| CSP (11) | Current sense positive input | Measures voltage across external RSENSE (CSP–BAT) for current regulation |
| BAT (12) | Battery sense negative reference | Return path for CSP; provides battery voltage reference for current sensing and BATMON |
| BATMON (13) | Battery voltage monitor output | Switched output representing battery voltage; used with external divider to set VFLOAT |
| FLAG (14) | C/10 charge termination indicator | Latching active-low open-drain signal triggered when charge current falls to ≤10% of programmed value |
| CLN (15) | Current limit amplifier negative input | Reference for input current limiting; threshold = VCLP – 100 mV |
| CLP (16) | Current limit amplifier positive input / IC supply | Serves as both current limit reference and primary power rail for internal circuitry |
| TGATE (17) | Top gate driver output | Drives external PMOSFET source-follower stage in buck converter topology |
| PGND (18) | Power ground return | High-current return path for BGATE driver and power stage; isolated from signal GND |
| BGATE (19) | Bottom gate driver output | Drives external NMOSFET in synchronous buck configuration; fast rise/fall times (40–90 ns) |
| INFET (20) | Input FET gate driver | Controls external P-MOSFET for reverse-current protection and AC-present logic (LTC4008 only) |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous constant-off-time PWM | Eliminates audible noise with ceramic capacitors and maintains stable operation across wide VIN/VOUT ranges |
| Integrated thermistor interface | Programmable sampling via RT resistor enables JEITA-compliant temperature-qualified charging without external ADC or MCU |
| AC adapter current limiting | CLP/CLN inputs allow precise setting of input current limit (e.g., 2 A from 19 V adapter), maximizing charge rate under supply constraints |
| Charging current monitoring | Linear PROG pin voltage (0.309 V @ 0 A, 1.19 V @ full scale) enables real-time current readback with <1% error |
| Dual gate drivers with fast transitions | TGATE/BGATE support <100 ns switching edges, reducing conduction losses and enabling high-efficiency 4 A charging |
| Input FET control (INFET) | Provides reverse-current blocking (<10 µs turn-off) and AC-present indication, simplifying adapter detection and system-level safety |
Applications
| Portable Medical Instruments | Notebook Computers |
|---|---|
Use Scenario: Rechargeable Li-ion packs powering handheld ultrasound or glucose monitors requiring safe, temperature-aware charging in field-deployed units. IC Role / Device Role / Timing Role: Primary battery charger controller managing CC/CV profile, NTC-based thermal cutoff, and input current adaptation during variable AC adapter availability. Use Value: Enables certified medical-grade charging compliance (IEC 62368-1) via hardware-enforced thermal suspension and fault reporting through FAULT/FLAG pins. | Use Scenario: High-current charging of multi-cell Li-ion batteries in ultrabooks with limited PCB space and strict thermal budgets. IC Role / Device Role / Timing Role: Synchronous buck controller delivering up to 4 A at >95% efficiency, with TGATE/BGATE driving discrete FETs and INFET ensuring reverse-current protection. Use Value: Reduces thermal stress and extends battery life via ±0.8% voltage accuracy and programmable C/10 termination, eliminating software dependency for end-of-charge detection. |
| Battery Backup Systems | Industrial Portable Test Equipment |
Use Scenario: UPS modules for telecom edge devices needing reliable charging from 24 V DC sources with robust overvoltage and thermal fault handling. IC Role / Device Role / Timing Role: Multi-chemistry charger supporting Li-ion and LiFePO₄ chemistries, with adjustable VFLOAT (3–28 V) and OVSD threshold (102–110% of programmed voltage). Use Value: Ensures system uptime via hardware-based overvoltage shutdown and seamless transition between AC and battery power using INFET-controlled input isolation. | Use Scenario: Ruggedized multimeters or oscilloscopes requiring long runtime and field-rechargeable batteries with precise capacity tracking. IC Role / Device Role / Timing Role: Charge controller with PROG pin analog current monitoring and BATMON-based voltage telemetry, feeding MCU for state-of-charge estimation. Use Value: Delivers accurate real-time current measurement (±4%) and voltage feedback (±0.8%), enabling firmware-based fuel gauging without additional sense amplifiers or ADC channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4008EGN-1#TRPBF | Omits INFET driver; no reverse-current protection or ACP indication; identical charge control, thermistor, and gate drive functionality | Suitable where input FET control is handled externally or unnecessary (e.g., fixed-input systems) | Select LTC4008EGN-1#TRPBF only if INFET functionality is unused - saves external component count but removes hardware-level AC-present signaling and reverse-current blocking |
| BQ24725ARHBT | TI part with SMBus interface, integrated ADC, and different pinout; lacks dedicated NTC sampling circuit and INFET driver | Requires MCU host for configuration and monitoring; better suited for systems needing digital telemetry over analog simplicity | Choose BQ24725ARHBT when SMBus communication, multi-device coordination, or embedded telemetry are required - not a drop-in replacement due to protocol and pinout differences |
Compared with LTC4008EGN-1#TRPBF, the LTC4008EGN#TRPBF adds hardware-enforced reverse-current blocking and AC-present detection, making it preferable for adapter-powered portable systems. Versus BQ24725ARHBT, it offers simpler analog configuration and dedicated thermal safety circuitry but requires external MCU for advanced state reporting.
Availability
LTC4008EGN#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable medical instruments, and battery backup systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC4008EGN#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4008 product line delivers highly integrated, high-efficiency battery charger controllers optimized for portable computing and instrumentation, emphasizing precision voltage/current regulation, thermal safety, and minimal external component count.
FAQ
What is the maximum charge current supported by the LTC4008EGN#TRPBF?
The LTC4008EGN#TRPBF supports output currents exceeding 4 A, with programmable charge current accuracy of ±4% typical. Peak current is set by the combination of an external sense resistor (RSENSE) and programming resistor (RPROG), and the device maintains regulation across its full 3V–28V output voltage range. Real-world performance depends on layout, thermal design, and external FET selection - the datasheet confirms stable 4 A operation in typical notebook applications.
Does the LTC4008EGN#TRPBF include built-in thermistor support?
Yes, the LTC4008EGN#TRPBF includes a dedicated NTC pin (Pin 8) and internal thermistor sampling circuitry controlled by the RT resistor (Pin 4). It automatically suspends charging when battery temperature exceeds safe limits and resumes when within range, asserting the FAULT pin low during fault conditions. This hardware-based thermal management requires no MCU intervention and complies with JEITA temperature qualification profiles.
How does the LTC4008EGN#TRPBF handle input current limiting from an AC adapter?
The LTC4008EGN#TRPBF implements input current limiting via the CLP and CLN pins, with a fixed 100 mV threshold across the sense resistor. When input current exceeds the limit, the ICL pin goes low and the charger reduces charge current dynamically. This feature maximizes charge rate under constrained adapter capability (e.g., 19 V/2 A adapter), and is independent of battery voltage or chemistry - a key advantage for multi-platform designs.
What is the purpose of the INFET pin on the LTC4008EGN#TRPBF?
INFET (Pin 20) on the LTC4008EGN#TRPBF drives an external P-channel MOSFET to provide reverse-current blocking and AC adapter presence indication. It turns off in <10 µs if reverse voltage is detected, preventing battery discharge into the adapter, and releases the ACP/SHDN pin to indicate valid input power. This function is absent in the LTC4008EGN-1 variant, making INFET essential for adapter-powered portable systems requiring hardware-level safety.
Can the LTC4008EGN#TRPBF be used for chemistries other than Li-ion?
Yes, the LTC4008EGN#TRPBF is a multi-chemistry charger controller supporting Li-ion, Li-polymer, LiFePO₄, and other battery types. Its wide 3V–28V output voltage range and programmable float voltage (via VFB/BATMON resistor divider) allow configuration for different chemistries - e.g., 14.4 V for 4S LiFePO₄ or 12.6 V for 3S Li-ion. Charge termination is based on C/10 current detection, adaptable across chemistries via PROG pin scaling.
LTC4008EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
LTC4008EGN#TRPBF FAQ
1.How can I place an order for LTC4008EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4008EGN#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 LTC4008EGN#TRPBF reliable?
The price and inventory of LTC4008EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4008EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4008EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4008EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4008EGN#TRPBF?
LTC4008EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4008EGN#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 LTC4008EGN#TRPBF?
For technical support, including LTC4008EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4008EGN#TRPBF requirements.
6.How does Aetrix verify that LTC4008EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4008EGN#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 LTC4008EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4008EGN#TRPBF?
All LTC4008EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4008EGN#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 LTC4008EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC4008EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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