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Analog Devices Inc. LTC4006EGN-4#TRPBF
- Part No.:
- LTC4006EGN-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4006EGN-4#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 4CELL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,636
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Product details
Overview
LTC4006EGN-4#TRPBF from Analog Devices (formerly Linear Technology) is a standalone synchronous buck-mode Li-ion battery charger controller for 4-cell stacks, delivering up to 4A programmable charge current with ±4% accuracy, ±0.8% float voltage accuracy at 16.8V, and 96% peak efficiency. It integrates thermistor-based temperature qualification, automatic deep-discharge conditioning, and AC adapter current limiting for portable industrial and medical battery systems.
For engineers reviewing the LTC4006EGN-4#TRPBF datasheet, LTC4006EGN-4#TRPBF pinout, LTC4006EGN-4#TRPBF application, or LTC4006EGN-4#TRPBF equivalent, key selection criteria include its 16.8V fixed float voltage, 16-pin narrow SSOP package, 300kHz typical switching frequency, and support for external P/N-MOSFET power stage in high-reliability standalone charging designs.
Technical Context
The LTC4006EGN-4#TRPBF implements a constant-off-time, current-mode synchronous buck architecture with dual gate drivers (TGATE/BGATE) for external MOSFETs and an INFET driver for input PFET protection. Its inner-loop control uses ITH voltage to regulate peak inductor current, while EA and CA2 amplifiers enforce constant-voltage and constant-current regulation via BAT/CSP sensing and IMON feedback.
Thermistor monitoring operates via sampled NTC voltage thresholds (0.125V low / 4.5V reference / 0.5V high), with automatic charge suspension and restart upon safe temperature return. The RT pin sets total charge time (tTIMER = 1 hour × RRT/154kΩ), and C/10 termination triggers timer reset to 25% of full duration when charging current drops below 10% of programmed value.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 16.8V ±0.8% - precisely regulates 4-cell Li-ion stack to 4.2V/cell without external resistor dividers. |
| Charge Current Accuracy | ±4% - ensures repeatable current setting using single sense resistor (RSENSE = 0.025Ω for 4A). |
| Switching Frequency | 300kHz typical - enables compact magnetics and ceramic output capacitors without audible noise. |
| Max Duty Cycle | 98% - supports operation down to 0.5V dropout, critical for high-VBAT / low-VDCIN conditions. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial ambient environments with junction limit of 125°C. |
| Input Voltage Range | 6V to 28V - accommodates wide-range DC adapters including 12V/19V/24V supplies. |
| Thermistor Interface | NTC input with 0.125V/4.5V/0.5V thresholds - enables precise battery temperature qualification per JEITA standards. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.15mm max height, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (1) | External DC input supply | Accepts 6–28V; powers CLN rail and enables UVLO detection at ≥4.7V. |
| CHG (2) | Open-drain charge status output | Pulled low during active charge; 25µA sink at C/10; high-Z on timeout or fault. |
| ACP/SHDN (3) | AC present indicator / shutdown control | Open-drain output pulled up internally to 3.5V; pulling <1V disables charger. |
| RT (4) | Timer resistor connection | Sets total charge time (e.g., 309kΩ = ~2 hours); open-circuit prevents startup. |
| GND (5) | Analog/digital ground reference | Low-noise return for sensing, logic, and internal amplifiers. |
| NTC (6) | Thermistor network input | Sampled to detect unsafe battery temperature; suspends charging if out-of-range. |
| ITH (7) | Inner-loop current control voltage | 0–3V analog signal controlling peak inductor current; loop compensation via RC network. |
| IMON (8) | Charging current monitor output | Linear 0.309V–1.19V voltage proportional to 0–100% of programmed current. |
| CSP (9) | Current sense amplifier positive input | Measures voltage across RSENSE (CSP–BAT) for real-time current feedback. |
| BAT (10) | Battery sense and current sense reference | High-impedance node for float voltage regulation and current sense common point. |
| CLP (11) | Positive input to input current limit amplifier | 100mV threshold above CLN; used to cap adapter current draw during limited-supply operation. |
| CLN (12) | Negative reference for input current limit amp | Also serves as IC power rail; requires 10–22µF local bypass capacitor. |
| TGATE (13) | Top-gate driver output | Drives external P-channel MOSFET source-follower stage in buck converter. |
| PGND (14) | Power ground return | High-current return path for BGATE driver and inductor current. |
| BGATE (15) | Bottom-gate driver output | Drives external N-channel MOSFET in synchronous buck low-side switch. |
| INFET (16) | Input PFET gate driver | Controls external P-MOSFET for reverse-current blocking and AC adapter presence logic. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic deep-discharge conditioning | Trickle-charges cells <2.5V/cell at 10% of programmed current until voltage exceeds threshold. |
| Programmable charge termination timer | Set via single RT resistor (e.g., 309kΩ = 2-hour full charge); reset to 25% on C/10 detection. |
| Integrated thermistor qualification | Monitors NTC network at regular intervals; halts charging outside safe temperature window and resumes automatically. |
| Adapter current limiting | CLP/CLN inputs enable user-defined input current cap (e.g., 100mV across RCL) to maximize charge rate under weak supplies. |
| Reverse current protection | INFET driver shuts off input PFET in <10µs if VDCIN–VCLN < –25mV, preventing battery discharge into adapter. |
| Dropout mode watchdog | Forces TGATE off for 300ns every 40µs when duty cycle >98%, eliminating ceramic-capacitor audible noise. |
Applications
| Medical Portable Defibrillators | Industrial Handheld Testers |
|---|---|
Use Scenario: Field-deployable defibrillator requiring rapid, reliable recharge of 4-cell Li-ion packs between emergency uses. IC Role / Device Role / Timing Role: Standalone charger controller managing CC/CV profile, thermal safety, and C/10 termination without host MCU intervention. Use Value: ±0.8% 16.8V float accuracy ensures cell longevity; 96% efficiency minimizes heat buildup in sealed enclosures. | Use Scenario: Battery-backed handheld multimeter or oscilloscope operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary charging engine with integrated adapter current limiting and deep-discharge recovery for intermittent use patterns. Use Value: Automatic 10% trickle-charge restores deeply depleted batteries; –40°C to +85°C rating supports unconditioned storage and operation. |
| Ruggedized Military Radios | Emergency Lighting Backup Systems |
Use Scenario: Manpack radio with hot-swap battery capability and strict MIL-STD-810H environmental compliance. IC Role / Device Role / Timing Role: Charge supervisor enforcing JEITA-compliant temperature windows and robust reverse-current blocking via INFET. Use Value: NTC sampling with 0.125V/0.5V thresholds enables precise cold/hot charge suspend; 25µA CHG sink signals C/10 state to host microcontroller. | Use Scenario: UL924-certified emergency egress lighting with 4S Li-ion backup and multi-year shelf life requirements. IC Role / Device Role / Timing Role: Low-quiescent charger maintaining battery readiness while minimizing self-discharge during standby. Use Value: 15µA sleep-mode battery drain extends shelf life; programmable RT timer ensures predictable maintenance cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24610RGTT | Fixed 16.8V float; no built-in thermistor interface; requires external NTC comparator circuit. | Lacks integrated temperature qualification - adds BOM cost and layout complexity for thermal safety. | Choose when thermistor monitoring is handled externally or omitted; verify adapter current limiting implementation matches system needs. |
| MP2617GQZ | 16.8V float; 3.5A max current; integrated MOSFETs (no external FETs); 2.5V–26V input range. | Monolithic solution eliminates external power stage but limits max current and thermal design flexibility. | Prefer for space-constrained designs where 3.5A suffices and discrete FET optimization is unnecessary. |
Compared with BQ24610RGTT and MP2617GQZ, the LTC4006EGN-4#TRPBF provides superior thermal safety integration, higher 4A current capability with discrete FET control, and tighter ±0.8% voltage accuracy - making it optimal for mission-critical industrial and medical chargers demanding precision, reliability, and field-serviceable power stages.
Availability
LTC4006EGN-4#TRPBF is available at Aetrix Electronics and suitable for medical portable defibrillators, industrial handheld testers, ruggedized military radios, and emergency lighting backup systems requiring stable component supply across extended product lifecycles.
Supply support for LTC4006EGN-4#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC4006EGN-4#TRPBF belongs to ADI's Linear Technology legacy battery management portfolio, engineered specifically for high-efficiency, standalone Li-ion charging in applications where reliability, thermal safety, and discrete power stage control are mandatory.
FAQ
What is the exact float voltage programmed in the LTC4006EGN-4#TRPBF?
The LTC4006EGN-4#TRPBF is factory-programmed for a nominal 16.8V float voltage, corresponding to 4.2V per cell for 4-series Li-ion batteries. This value is trimmed to ±0.8% accuracy over the full –40°C to +85°C operating temperature range, ensuring precise cell balancing and long-term cycle life without external calibration.
Does the LTC4006EGN-4#TRPBF require external MOSFETs, and what types are supported?
Yes, the LTC4006EGN-4#TRPBF requires external power MOSFETs: a P-channel device driven by TGATE for the high-side switch, an N-channel device driven by BGATE for the low-side switch, and another P-channel device driven by INFET for input reverse-current protection. Gate drive voltages and timing specs (e.g., 50–110ns transition times) are optimized for standard logic-level or standard-threshold FETs.
How does the LTC4006EGN-4#TRPBF handle deeply discharged batteries below 2.5V per cell?
The LTC4006EGN-4#TRPBF automatically initiates trickle charging at 10% of the programmed 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. Recovery requires manual reset or battery voltage rise above 3.9V/cell.
Can the LTC4006EGN-4#TRPBF operate without a thermistor network connected?
Yes - the LTC4006EGN-4#TRPBF can operate without a thermistor by disabling the function: connect a 300kΩ–500kΩ resistor from DCIN to NTC. In this configuration, temperature qualification is bypassed, and charging proceeds normally. However, this removes JEITA-compliant thermal safety, so it is only recommended for controlled-environment applications where battery temperature remains within safe limits.
What is the purpose of the IMON pin on the LTC4006EGN-4#TRPBF, and how is it used?
The IMON pin on the LTC4006EGN-4#TRPBF provides a linear voltage output (0.309V at 0A, 1.19V at 100% of programmed current) proportional to instantaneous charging current. It enables real-time current monitoring without shunt resistor duplication. For accurate readings, a high-impedance buffer must be used, as any load on IMON directly affects charging current accuracy.
LTC4006EGN-4#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:
- 4
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 16.8V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC4006EGN-4#TRPBF FAQ
1.How can I place an order for LTC4006EGN-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4006EGN-4#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-4#TRPBF reliable?
The price and inventory of LTC4006EGN-4#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-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4006EGN-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4006EGN-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4006EGN-4#TRPBF?
LTC4006EGN-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4006EGN-4#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-4#TRPBF?
For technical support, including LTC4006EGN-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4006EGN-4#TRPBF requirements.
6.How does Aetrix verify that LTC4006EGN-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4006EGN-4#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-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4006EGN-4#TRPBF?
All LTC4006EGN-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4006EGN-4#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-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC4006EGN-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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