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Analog Devices Inc. LTC4006EGN-2#TRPBF
- Part No.:
- LTC4006EGN-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4006EGN-2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 3CELL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,570
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Product details
Overview
LTC4006EGN-2#TRPBF from Analog Devices (formerly Linear Technology) is a standalone synchronous buck-mode Li-ion battery charger controller for 3-cell (12.6V) packs, delivering up to 4A programmable charge current with ±4% accuracy, ±0.8% float voltage accuracy (12.6V), and 96% peak efficiency - used in portable medical instruments, ruggedized industrial handhelds, and battery-backup UPS modules.
For engineers reviewing the LTC4006EGN-2#TRPBF datasheet, LTC4006EGN-2#TRPBF pinout, LTC4006EGN-2#TRPBF application, or LTC4006EGN-2#TRPBF equivalent, this device requires attention to its thermistor-based temperature qualification, adaptive C/10 termination, AC adapter current limiting, and 16-pin SSOP package layout for high-current gate drive routing.
Technical Context
The LTC4006EGN-2#TRPBF implements a constant-off-time, current-mode PWM architecture with synchronous rectification, supporting dropout operation down to 0.5V input-to-battery differential and 98% maximum duty cycle. Its dual-loop control integrates average current sensing via CSP/BAT and voltage regulation via internal 1.19V reference and precision resistor divider on BAT.
Thermistor monitoring uses sample-and-hold circuitry with programmable timing (via RT pin), while the INFET driver enables reverse-current protection (<1.25µs response) and AC-present indication via ACP/SHDN open-drain output. Charge termination combines timer-based timeout, C/10 detection, and low-battery fault handling below 2.5V/cell.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 12.6V ±0.8% - factory-trimmed for 3-cell Li-ion; no external resistor required |
| Max Charge Current | Programmable up to 4A via RSENSE; ±4% accuracy excludes sense resistor tolerance |
| Efficiency | Up to 96% - enables compact thermal design in sealed portable enclosures |
| Operating Input Range | 6V to 28V DCIN - supports wide-range adapters and industrial power rails |
| Temp Range | –40°C to +85°C ambient - qualified for extended outdoor and vehicle-mounted use |
| Switching Frequency | 255–345 kHz - avoids audible noise even with ceramic output capacitors |
| Duty Cycle Max | 98% - sustains regulation when VDCIN – VBAT ≤ 0.5V, critical for low-voltage adapters |
Pinout & Package
16-lead narrow SSOP (GN) package, 0.635mm pitch, exposed pad for thermal dissipation. Pin 1 marked with dot; pin 1 is DCIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (1) | Input power rail | Accepts 6–28V; powers CLN and drives INFET; UVLO threshold 4.2–5.5V |
| CHG (2) | Open-drain status output | Pulled low during charging; 25µA sink at C/10; high-Z at termination or fault |
| ACP/SHDN (3) | Adapter present / shutdown control | Open-drain indicator; internal 10µA pull-up; <1V forces shutdown and timer reset |
| RT (4) | Timer programming node | Resistor to GND sets total charge time: tTIMER = 1 hour × RRT/154kΩ |
| GND (5) | Analog/digital ground reference | Low-noise return for sensing; separate from PGND; must be star-connected |
| NTC (6) | Thermistor interface | Sampled periodically; suspends charging if outside safe temp window (configurable) |
| ITH (7) | Current loop control voltage | 0–3V analog control of peak inductor current; compensation network required |
| IMON (8) | Current monitor output | Linear 0.309V–1.19V output (0–100% ICHARGE); requires filtering capacitor |
| CSP (9) | Current sense positive input | Measures voltage across RSENSE; referenced to BAT; high common-mode rejection |
| BAT (10) | Battery sense / current sense negative | Float voltage reference point; internal divider sets 12.6V; disconnected in shutdown |
| CLP (11) | Input current limit positive | 100mV threshold above CLN; used to cap adapter current without affecting charge rate |
| CLN (12) | Input current limit reference / supply | IC power rail; bypass with 10–22µF; also serves as CL1 negative input |
| TGATE (13) | Top P-FET gate driver | Drives external high-side PFET; fast rise/fall times (50–110ns) minimize switching loss |
| PGND (14) | Power ground return | High-current path for BGATE; must be low-inductance connection to CLN and RSENSE |
| BGATE (15) | Bottom N-FET gate driver | Drives external low-side NFET; 4.5–10V swing; 40–90ns transition times |
| INFET (16) | Input PFET gate driver | Controls reverse-current blocking FET; responds within 1.25µs to reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive low-voltage conditioning | Automatically trickle-charges batteries below 2.5V/cell at 10% of programmed current |
| Thermistor-based safety lockout | Suspends charging if NTC voltage exceeds high/low thresholds; resumes automatically on recovery |
| AC adapter current limiting | Prevents overloading input supplies by clamping input current independently of battery state |
| Dropout-aware PWM architecture | Maintains regulation down to 0.5V VDCIN–VBAT differential using watchdog-controlled forced off-time |
| C/10 + timer dual-termination | Terminates when current falls to 10% of set value OR timer expires - prevents overcharge and cell stress |
| Reverse-current protection | INFET driver disables input FET within 1.25µs if VDCIN < VCLN by >25mV, blocking backfeed |
Applications
| Portable Medical Diagnostics | Rugged Industrial Handhelds |
|---|---|
|
Use Scenario: Battery-powered ultrasound probe with 3S Li-ion pack operating in field-deployed environments where temperature swings and intermittent AC availability are common. IC Role / Device Role / Timing Role: Standalone charger controller managing full CC/CV profile, thermistor-based thermal qualification, and AC adapter current limiting to avoid tripping shared lab power supplies. Use Value: Enables reliable 4A charging without external microcontroller supervision; ±0.8% voltage accuracy ensures cell longevity across –20°C to +60°C operating range. |
Use Scenario: Intrinsically safe gas detector with hot-swappable 3S battery, requiring automatic deep-discharge recovery and fail-safe thermal cutoff before deployment in hazardous zones. IC Role / Device Role / Timing Role: Autonomous charge manager performing low-voltage preconditioning, C/10 termination, and NTC-monitored charge suspension - all without host processor involvement. Use Value: Eliminates need for external ADC or firmware logic; built-in 2.5V/cell undervoltage lockout and 3.9V/cell restart threshold prevent lithium plating during field reinsertion. |
| Uninterruptible Power Modules | Mobile Test & Measurement Equipment |
|
Use Scenario: Compact 12V backup system for edge IoT gateways, maintaining runtime during grid outages while accepting wide-input 9–24V PoE or wall adapters. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 96% peak conversion, with CLP/CLN current limiting to protect upstream DC-DC converters under simultaneous load+charge conditions. Use Value: Reduces thermal footprint in sealed enclosures; 6–28V input range accommodates both PoE+ injectors and universal AC adapters without redesign. |
Use Scenario: Portable oscilloscope with dual-battery operation, requiring precise 12.6V float voltage, low-noise operation with ceramic caps, and seamless transition between AC and battery power. IC Role / Device Role / Timing Role: Synchronous buck charger with constant-off-time modulation that eliminates audible noise - critical for sensitive analog front-end performance. Use Value: Enables silent operation during signal acquisition; IMON pin provides calibrated current telemetry for battery fuel gauging without additional components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24725ARHDT | 40V max input; integrated MOSFET drivers only (no power FETs); requires external sense resistor and thermistor circuit | Designed for notebook SMBus systems; lacks autonomous C/10 + timer dual-termination logic | Choose for SMBus-managed systems needing host-controlled charge profiles; not suitable for standalone operation |
| MP2759GQZ | Single-chip solution with integrated power FETs; 3.5A max; fixed 12.6V output; no RT-programmable timer | Targeted at space-constrained consumer devices; no CLP/CLN current limiting or INFET reverse protection | Choose for cost-sensitive, low-component-count designs where 3.5A and fixed timing suffice; no external FET flexibility |
Compared with BQ24725ARHDT and MP2759GQZ, the LTC4006EGN-2#TRPBF offers unique standalone autonomy, programmable 4A current, dual-termination safety, and robust reverse-current blocking - making it optimal for industrial and medical systems requiring zero-host dependency and high reliability.
Availability
LTC4006EGN-2#TRPBF is available at Aetrix Electronics and suitable for portable medical diagnostics, rugged industrial handhelds, and uninterruptible power modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC4006EGN-2#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and aerospace markets.
The LTC4006EGN-2#TRPBF belongs to Linear's legacy high-efficiency battery management portfolio, engineered specifically for standalone, high-reliability Li-ion charging in harsh environments where microcontroller supervision is impractical or undesirable.
FAQ
What is the exact float voltage programmed into the LTC4006EGN-2#TRPBF?
The LTC4006EGN-2#TRPBF is factory trimmed to deliver a precise 12.6V ±0.8% float voltage, optimized for 3-cell (3S) lithium-ion battery packs. This value is internally set and requires no external resistive divider - unlike the LTC4006EGN-4 (16.8V) or LTC4006EGN-6 (8.4V) variants. The ±0.8% tolerance applies across the full –40°C to +85°C operating temperature range.
How does the LTC4006EGN-2#TRPBF handle deeply discharged batteries below 2.5V per cell?
The LTC4006EGN-2#TRPBF initiates automatic trickle charging at 10% of the programmed maximum current when any cell voltage falls below 2.5V. If the low-voltage condition persists beyond 25% of the total charge time (set by the RT resistor), charging terminates and the CHG pin goes high-impedance. The LTC4006EGN-2#TRPBF will only resume charging autonomously when the battery voltage rises above 3.9V/cell.
Can the LTC4006EGN-2#TRPBF operate without an external thermistor?
Yes - the LTC4006EGN-2#TRPBF can operate without a thermistor by connecting a 300kΩ to 500kΩ resistor from DCIN to the NTC pin. This disables thermistor monitoring while preserving all other functions. However, disabling thermal qualification removes a critical safety layer; Analog Devices recommends retaining the NTC network for medical, industrial, or automotive applications where battery temperature excursions are possible.
What is the purpose of the CLP and CLN pins on the LTC4006EGN-2#TRPBF?
The CLP and CLN pins implement independent input current limiting on the LTC4006EGN-2#TRPBF. CLN serves as both the negative reference for the current-limit amplifier and the IC's main power supply rail. CLP is the positive input, with a fixed 100mV threshold above CLN. When used, this function caps adapter current without affecting battery charge current - essential for shared power sources or current-limited adapters.
Does the LTC4006EGN-2#TRPBF support reverse-current protection, and how is it implemented?
Yes - the LTC4006EGN-2#TRPBF provides hardware-based reverse-current protection via its INFET pin. When VDCIN drops below VCLN by more than 25mV, the INFET driver turns off the external input PFET within 1.25µs, preventing battery discharge back into the adapter. This is fully autonomous and requires no external logic or comparators - a key differentiator from many competing controllers.
LTC4006EGN-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 12.6V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC4006EGN-2#TRPBF FAQ
1.How can I place an order for LTC4006EGN-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4006EGN-2#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 LTC4006EGN-2#TRPBF reliable?
The price and inventory of LTC4006EGN-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4006EGN-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4006EGN-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4006EGN-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4006EGN-2#TRPBF?
LTC4006EGN-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4006EGN-2#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 LTC4006EGN-2#TRPBF?
For technical support, including LTC4006EGN-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4006EGN-2#TRPBF requirements.
6.How does Aetrix verify that LTC4006EGN-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4006EGN-2#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 LTC4006EGN-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4006EGN-2#TRPBF?
All LTC4006EGN-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4006EGN-2#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 LTC4006EGN-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4006EGN-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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