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Analog Devices Inc. LTC4008EGN-1#TRPBF
- Part No.:
- LTC4008EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4008EGN-1#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
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Product details
Overview
LTC4008EGN-1#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, ±4% current programming accuracy, and operates across 6V–28V input and 3V–28V output ranges. Designed for notebook computers and portable instruments, it integrates thermistor-based temperature qualification, AC adapter current limiting, and dual gate drivers for external N/P-MOSFETs.
For engineers reviewing the LTC4008EGN-1#TRPBF datasheet, LTC4008EGN-1#TRPBF pinout, LTC4008EGN-1#TRPBF application, or LTC4008EGN-1#TRPBF equivalent, this device serves as a high-efficiency (up to 96%), quasi-constant-frequency PWM buck controller with programmable float voltage, C/10 detection, and fault-safe thermal management - critical for reliable embedded battery charging systems requiring stable supply and precise current/voltage regulation.
Technical Context
The LTC4008EGN-1#TRPBF implements a synchronous, constant-off-time, current-mode PWM architecture with 255–345 kHz switching frequency and 98% maximum duty cycle. Its inner-loop control uses ITH voltage to regulate peak inductor current via external sense resistor (RSENSE) and PROG pin programming resistor (RPROG), achieving ±4% charge current accuracy independent of input voltage variation.
Unlike the base LTC4008, the LTC4008EGN-1#TRPBF disables the INFET driver function - eliminating input P-FET control and ACP/SHDN's AC-present indication - while retaining full battery charging control, thermistor monitoring (NTC), input current limiting (ICL), and dual gate drive (TGATE/BGATE) for external buck converter MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Charge Current | 4A - supports high-capacity single-cell or multi-cell Li-ion packs with external MOSFETs and sense resistor. |
| Voltage Accuracy | ±0.8% at 25°C - ensures tight float voltage regulation (e.g., ±102 mV on 12.6V battery), minimizing overcharge risk. |
| Current Accuracy | ±4% - enables precise charge termination and C/10 detection without calibration, reducing BOM cost. |
| Input Voltage Range | 6V to 28V - compatible with wide-range DC adapters (e.g., 12V/19V/24V supplies) and industrial power rails. |
| Switching Frequency | 255–345 kHz - avoids audible noise with ceramic capacitors and allows compact magnetics design. |
| Duty Cycle Max | 98% - supports low-dropout operation down to 0.5V headroom, extending usable input range near battery voltage. |
| Thermistor Interface | Dedicated NTC pin with programmable sampling via RT resistor - enables safe, automatic charge suspension outside 0°C–45°C battery temp range. |
| Operating Temp | –40°C to 125°C junction - qualified for automotive-adjacent and ruggedized portable equipment environments. |
Pinout & Package
Package: 20-lead narrow plastic SSOP (GN), 0.635 mm pitch, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (1) | Primary power input | Accepts 6V–28V unregulated DC; powers internal circuitry and CLP rail; bypass required with ≥0.01µF capacitor. |
| ICL (2) | Input current limit indicator | Active-low open-drain flag signaling when charging current is reduced due to adapter current limit - enables dynamic algorithm adaptation. |
| ACP/SHDN (3) | Adapter present / shutdown control | Open-drain output (LTC4008-1: ACP disabled); pulled low to shut down charger - no AC-present indication function in this variant. |
| RT (4) | Thermistor clock timing | Connects to 150kΩ resistor to set thermistor sampling interval (6.7 ms sample, 26 µs hold); mandatory for NTC operation. |
| FAULT (5) | Thermal fault indicator | Active-low open-drain output latched low when NTC detects unsafe battery temperature - requires external pull-up. |
| GND (6) | Analog/digital ground reference | Low-power ground return; separate from PGND to minimize noise coupling into feedback paths. |
| VFB (7) | Voltage feedback input | Connects to resistor divider from BATMON to set float voltage using internal 1.19V reference - determines final battery charge voltage. |
| NTC (8) | Thermistor network input | Sampled periodically to monitor battery temperature; high-impedance node requiring external 10kΩ NTC + RC filter. |
| ITH (9) | Inner-loop current control | Analog control voltage (0–3V) setting peak inductor current; compensated via 6kΩ + ≥0.1µF to GND for loop stability. |
| PROG (10) | Charge current programming/monitoring | Resistor-to-GND sets full-scale current; voltage at pin linearly tracks actual charge current (0.309V = 0A, 1.19V = full scale). |
| CSP (11) | Current sense positive input | High-side input of CA1 amplifier measuring voltage across external RSENSE - enables accurate average/peak current sensing. |
| BAT (12) | Battery sense negative reference | Return path for CSP; also used as reference for RSENSE placement - must be Kelvin-connected to battery negative terminal. |
| BATMON (13) | Battery voltage monitor output | Switched output representing battery voltage; used with external divider to VFB to program float voltage - load ≥100kΩ required. |
| FLAG (14) | C/10 charge completion indicator | Active-low latched open-drain output signaling when charge current drops to ≤10% of programmed value - cleared only by cycling ACP/SHDN. |
| CLN (15) | Input current limit negative input | Reference for CL1 amplifier; threshold = VCLP – 100mV - connects to CLP if input current limiting is unused. |
| CLP (16) | Input current limit positive reference / IC supply | Serves as power rail for internal circuitry and reference for CL1; tied to DCIN through low-ESR capacitor. |
| TGATE (17) | Top gate driver output | Drives external high-side PMOSFET (e.g., Si4431BDY); 50mV high-level drop and 5.6–10V swing ensure efficient FET turn-on. |
| PGND (18) | Power ground return | High-current return path for BGATE driver and buck converter - must be routed separately from signal GND to avoid noise injection. |
| BGATE (19) | Bottom gate driver output | Drives external low-side NMOSFET (e.g., FDC645N); 50mV low-level drop and 5.6–10V swing support fast switching and low conduction loss. |
| INFET (20) | Input FET gate driver | No connection in LTC4008EGN-1#TRPBF - INFET functionality is fully disabled per datasheet revision C. |
Key Features
| Feature | Design Value |
|---|---|
| Quasi-constant frequency PWM | 255–345 kHz operation eliminates audible noise with ceramic capacitors - critical for quiet portable instrumentation. |
| Programmable C/10 detection | FLAG pin latches low at precisely 10% of programmed current - enables reliable end-of-charge signaling without external comparators. |
| Thermistor-based safety shutdown | NTC interface with user-programmable thresholds suspends charging outside safe battery temperature range and auto-resumes when safe. |
| AC adapter current limiting | ICL pin signals active input current limit condition - allows host system to throttle peripheral loads or adjust charging rate dynamically. |
| High-accuracy voltage regulation | ±0.8% float voltage accuracy minimizes overvoltage stress on Li-ion cells, extending cycle life and improving safety margin. |
| Wide operating temperature range | –40°C to 125°C junction rating supports deployment in harsh environments including automotive cabins and industrial enclosures. |
Applications
| Portable Medical Instruments | Notebook Computers |
|---|---|
|
Use Scenario: Rechargeable handheld ultrasound or glucose monitors requiring certified battery safety and long runtime between charges. IC Role / Device Role / Timing Role: Primary battery charger controller managing CC/CV profile, thermistor-monitored charge suspension, and C/10 termination for Li-ion packs. Use Value: Enables FDA-aligned thermal safety compliance via hardware-enforced NTC cutoff and ±0.8% voltage accuracy - reduces firmware validation burden. |
Use Scenario: OEM laptop platforms needing flexible, high-efficiency charging across multiple battery chemistries and adapter voltages (12V/19V/24V). IC Role / Device Role / Timing Role: Synchronous buck controller driving external MOSFETs to deliver up to 4A charge current with adaptive input current limiting. Use Value: 96% peak efficiency and 98% max duty cycle extend usable input range and reduce thermal load on compact PCB layouts. |
| Battery Backup Systems | Industrial Portable Test Equipment |
|
Use Scenario: Rack-mounted UPS modules or telecom backup units requiring reliable LiFePO₄ or Li-ion charging under variable line conditions. IC Role / Device Role / Timing Role: Multi-chemistry charger controller supporting programmable float voltage (3V–28V) and robust input current limiting for generator-fed inputs. Use Value: Input voltage range (6V–28V) and ±4% current accuracy allow single design to cover 12V/24V/48V nominal backup systems with minimal component changes. |
Use Scenario: Handheld oscilloscopes or multimeters operating in field environments where battery temperature fluctuates rapidly. IC Role / Device Role / Timing Role: Battery management controller with real-time thermistor sampling (via RT resistor) and latched FAULT output for fail-safe shutdown. Use Value: Hardware-based thermal protection eliminates reliance on MCU polling - guarantees response within 6.7 ms sample interval regardless of firmware state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2617GR-Z | Integrated power MOSFETs (no external FETs required); lower max current (2.5A); no thermistor input; fixed 4.2V float. | Best for space-constrained, low-cost consumer devices where external FET flexibility and multi-chemistry support are not needed. | Select MP2617GR-Z only if board area is critical and 4A+ current, NTC safety, or adjustable float voltage are unnecessary. |
| BQ24725ARHDT | Supports SMBus communication; includes input OVP/OCP protection; requires external NTC but lacks dedicated FAULT latch; 3.5A max. | Suitable for server/enterprise systems needing telemetry and coordinated power sequencing with host processors. | Choose BQ24725ARHDT when SMBus control, input protection, and system-level power management integration outweigh need for standalone thermal latching. |
Compared with MP2617GR-Z and BQ24725ARHDT, the LTC4008EGN-1#TRPBF provides superior thermal safety assurance via hardware-latched FAULT, wider input/output voltage flexibility (6V–28V), and higher 4A current capability - making it optimal for ruggedized, high-reliability portable equipment where external FET control and deterministic safety response are essential.
Availability
LTC4008EGN-1#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 guaranteed RoHS-compliant manufacturing.
Supply support for LTC4008EGN-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4008EGN-1#TRPBF belongs to ADI's Power Management product line, designed specifically for high-efficiency, multi-chemistry battery charging in portable and embedded systems where precision, reliability, and thermal safety are non-negotiable.
FAQ
What is the key functional difference between LTC4008EGN-1#TRPBF and the standard LTC4008?
The LTC4008EGN-1#TRPBF disables the INFET driver and ACP/SHDN's AC-present indication function - meaning it cannot control an input P-MOSFET or signal adapter presence. All other functions (battery charging control, thermistor monitoring, gate drive, C/10 detection) remain identical. This variant simplifies designs where input FET control is handled externally or unnecessary.
Does LTC4008EGN-1#TRPBF support LiFePO₄ battery chemistry?
Yes, LTC4008EGN-1#TRPBF supports LiFePO₄ via programmable float voltage (3V–28V). For a typical 3.6V/cell LiFePO₄ pack, configure the BATMON-to-VFB resistor divider to set VFLOAT = 3.6V × N, using the internal 1.19V reference. The ±0.8% voltage accuracy ensures safe, consistent termination.
How is C/10 detection implemented in LTC4008EGN-1#TRPBF, and can it be disabled?
LTC4008EGN-1#TRPBF uses an internal comparator monitoring the PROG pin voltage; FLAG latches low when VPROG drops to ~0.4V (corresponding to 10% of full-scale current). It cannot be disabled in hardware - but the latch is cleared only by cycling ACP/SHDN, allowing software-controlled reset after charge termination.
What is the minimum recommended RSENSE value for 4A operation with LTC4008EGN-1#TRPBF?
For 4A maximum charge current, the datasheet specifies RSENSE = 0.025Ω (1% tolerance, 0.5W). This yields ~100mV drop at full scale, optimizing signal-to-noise ratio for the current sense amplifier while staying within thermal limits and matching the ±4% current accuracy specification.
Can LTC4008EGN-1#TRPBF operate without a thermistor network connected?
Yes - LTC4008EGN-1#TRPBF will operate without NTC, but thermal safety is disabled. To disable thermistor monitoring safely, connect a 300kΩ–500kΩ resistor from DCIN to NTC pin per datasheet guidance. This prevents floating input and ensures FAULT remains inactive during normal operation.
LTC4008EGN-1#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-1#TRPBF FAQ
1.How can I place an order for LTC4008EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4008EGN-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 LTC4008EGN-1#TRPBF reliable?
The price and inventory of LTC4008EGN-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 LTC4008EGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4008EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4008EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4008EGN-1#TRPBF?
LTC4008EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4008EGN-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 LTC4008EGN-1#TRPBF?
For technical support, including LTC4008EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4008EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC4008EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4008EGN-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 LTC4008EGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4008EGN-1#TRPBF?
All LTC4008EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4008EGN-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 LTC4008EGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4008EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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