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Analog Devices Inc. LT3650IDD-4.1#TRPBF
- Part No.:
- LT3650IDD-4.1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3650IDD-4.1#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,651
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Product details
Overview
LT3650IDD-4.1#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down Li-Ion/Polymer battery charger IC with 4.75V–32V input range, 4.1V float voltage, and integrated 2A switch. It delivers constant-current/constant-voltage charging with programmable C/10 or timer-based termination, preconditioning for deeply discharged batteries, and NTC temperature monitoring. It is used in 12V–24V automotive cradle chargers and industrial handheld instruments.
For engineers reviewing the LT3650IDD-4.1#TRPBF datasheet, LT3650IDD-4.1#TRPBF pinout, LT3650IDD-4.1#TRPBF application, or LT3650IDD-4.1#TRPBF equivalent, key selection considerations include its 4.1V float voltage accuracy (±0.5%), 5% charge current accuracy, 1MHz fixed-frequency average current mode control, thermal foldback protection, and compatibility with 3mm × 3mm DFN-12 packaging for space-constrained power management designs.
Technical Context
The LT3650IDD-4.1#TRPBF implements a 1MHz fixed-frequency average current mode buck converter architecture with internal 2A switch and bootstrapped gate drive (BOOST pin). Its control loop directly regulates average inductor current via SENSE–BAT differential voltage, with ITH error amplifier output clamped to 1V to enforce 100mV sense threshold and 2A max current.
It integrates dual termination schemes: C/10 detection (VSENSE–VBAT = 10mV ±2.5mV) and user-programmable safety timer (3-hour default via 0.68µF capacitor on TIMER pin), with bad-battery detection triggered if preconditioning exceeds 22.5 minutes. Preconditioning activates below 2.9V BAT and reduces charge current to 15% of programmed maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.10V ±0.02V (LT3650-4.1 variant; enables precise single-cell Li-Ion full-charge regulation) |
| Max Charge Current | 2A (set by external 0.05Ω sense resistor; supports high-power portable battery systems) |
| Input Voltage Range | 4.75V to 32V (enables direct use with 12V/24V automotive and industrial supplies without pre-regulation) |
| Charge Termination | C/10 detection or 3-hour programmable timer (provides flexibility for battery chemistry and system reliability requirements) |
| Accuracy | 0.5% float voltage, 5% charge current, 2.5% C/10 detection (ensures consistent cell stress and cycle life across temperature) |
| Standby Current | 85µA (minimizes parasitic drain when battery is fully charged and system is idle) |
| Operating Frequency | 1MHz ±10% (allows compact 6.8µH inductor and 10µF output capacitance in space-limited layouts) |
Pinout & Package
LT3650IDD-4.1#TRPBF is housed in a 3mm × 3mm, 12-pin plastic DFN package with exposed thermal pad (Pin 13 = GND). The package supports high-power dissipation (θJC = 3°C/W) and requires soldering the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.75V–32V; powers internal circuitry and switch; requires ≥7.5V or BOOST–SW > 2V for startup |
| CLP (2) | System current limit monitor | Enables dynamic reduction of charge current to maintain total system input current limit (e.g., USB PD or adapter compliance) |
| SHDN (3) | Enable/disable control | 1.225V precision threshold; 120mV hysteresis; pulls VIN current to 15µA in shutdown |
| CHRG (4) | Open-collector status output | Pulled low during active charging; high-impedance at termination; indicates C/10 or timer EOC |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC over/under-temperature, bad-battery detection, or timer fault; sinks up to 10mA |
| TIMER (6) | Charge cycle timeout programming | Connects to ground (disable) or 0.68µF capacitor (3-hour default); enables time-based termination and bad-battery detection |
| RNG/SS (7) | Charge current programming & soft-start | Sources 50µA; sets max current via VRNG/SS × ICHG(MAX); supports RC soft-start to limit inrush |
| NTC (8) | Battery temperature sensing input | Sources 50µA; monitors 10kΩ B=3380 thermistor; disables charging if VNTC < 0.29V (T > 40°C) or > 1.36V (T < 0°C) |
| BAT (9) | Battery voltage feedback | Direct connection to battery anode; senses float voltage; triggers auto-recharge at 97.5% VFLT (4.0V) |
| SENSE (10) | Current sense input | Connects to high-side of RSENSE; 100mV full-scale corresponds to 2A; bias current < 0.1µA post-termination |
| BOOST (11) | Switch gate drive bootstrap rail | Capacitor (≥1µF) between BOOST and SW enables saturated switch operation; improves efficiency at high VIN |
| SW (12) | Switch node output | Drives external inductor; internal 2A switch with 0.175Ω typical RDS(ON); VIN–VSW ≤ 350mV at 2A |
| SGND (13) | Power ground & thermal pad | Exposed pad must be soldered to PCB ground plane; primary thermal path (θJC = 3°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| No blocking diode required | Integrated reverse-voltage protection eliminates external diode, reducing BOM count and forward drop loss |
| Auto-precondition & bad-battery detection | Activates trickle charge below 2.9V BAT; halts charging and asserts FAULT if battery fails to rise within 22.5 min |
| Programmable input current limit (CLP) | Allows shared input rail management-e.g., limits total system draw to 2A while allocating remaining current to peripherals |
| Binary-coded open-collector status outputs | CHRG and FAULT pins provide unambiguous real-time state signaling without level-shifting or pull-up conflicts |
| Thermal foldback and standby mode | Reduces IMAX automatically above junction temperature threshold; enters 85µA standby after termination to preserve battery |
Applications
| Automotive Cradle Charger | Industrial Handheld Instrument |
|---|---|
|
Use Scenario: 12V vehicle power socket charging a ruggedized tablet or data logger with Li-Po battery. IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, input current sharing with host MCU, and NTC-based thermal cutoff. Use Value: Enables direct 12V–24V charging without pre-regulator; CLP pin ensures total system load stays within fuse rating; 4.1V float prevents overvoltage stress on aged cells. |
Use Scenario: Portable gas detector or multimeter powered by removable 3.7V Li-Ion pack, recharged via wall adapter. IC Role / Device Role / Timing Role: Monolithic charger with auto-restart, preconditioning, and fault reporting for field-deployed equipment requiring high reliability. Use Value: Preconditioning safely revives deeply discharged batteries; 85µA standby minimizes self-discharge during storage; DFN-12 footprint fits compact enclosures. |
| Notebook Computer Docking Station | Desktop Battery Cradle |
|
Use Scenario: Docking station supplying power to laptop while simultaneously charging its internal battery from 19V DC input. IC Role / Device Role / Timing Role: Secondary charging controller handling battery top-off and thermal supervision independent of main system PMIC. Use Value: 32V max input accommodates wide-range adapters; timer-based termination ensures predictable charge completion; CHRG/FAULT enable host firmware diagnostics. |
Use Scenario: Benchtop cradle for calibrating or servicing medical devices with swappable Li-Ion packs. IC Role / Device Role / Timing Role: Standalone charger IC providing visible status (via CHRG/FAULT LEDs) and safe, repeatable charge cycles per ANSI/AAMI standards. Use Value: C/10 termination guarantees full capacity without overcharge; NTC monitoring satisfies IEC 62368-1 thermal safety; 0.5% float accuracy supports calibration-grade battery health tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-Ion battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3650EDD-4.1#TRPBF | Same electrical specs and pinout; rated for 0°C to 85°C (vs. –40°C to 85°C for LT3650IDD-4.1#TRPBF) | Suitable for commercial-temperature environments only; not qualified for extended industrial cold starts | Select LT3650IDD-4.1#TRPBF for operation below 0°C or where guaranteed performance across –40°C to 85°C is required. |
| BQ24610RGER | 4.1V float option available; 3.5A max current; requires external MOSFETs; no integrated switch; no NTC monitoring | Supports higher current but adds complexity; lacks integrated thermal safety and compact monolithic form factor | Choose LT3650IDD-4.1#TRPBF when board space, BOM simplicity, and built-in NTC/FAULT signaling are prioritized over >2A current. |
Compared with LT3650EDD-4.1#TRPBF, the LT3650IDD-4.1#TRPBF guarantees full specification compliance down to –40°C, critical for outdoor or automotive cold-cranking environments; versus BQ24610RGER, it trades external FET flexibility for reduced layout area, lower component count, and embedded safety features-making it optimal for compact, cost-sensitive, thermally supervised chargers.
Availability
LT3650IDD-4.1#TRPBF is available at Aetrix Electronics and suitable for 12V–24V automotive cradle chargers, industrial handheld instruments, notebook docking stations, and desktop battery cradles requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.
Supply support for LT3650IDD-4.1#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3650 product line delivers monolithic, high-input-voltage Li-Ion chargers optimized for rugged, space-constrained applications where input supply varies widely (e.g., automotive, industrial, and portable instrumentation), emphasizing integration, thermal robustness, and safety compliance.
FAQ
What is the float voltage setting for LT3650IDD-4.1#TRPBF?
The LT3650IDD-4.1#TRPBF is factory-configured for a nominal 4.10V float voltage with ±0.02V (0.5%) accuracy over temperature. This value is fixed for the -4.1 variant and differs from the LT3650-4.2's 4.20V setting. It is trimmed during production and does not require external resistor programming.
How does LT3650IDD-4.1#TRPBF handle deeply discharged batteries?
The LT3650IDD-4.1#TRPBF automatically enters precondition mode when BAT voltage falls below 2.9V, reducing charge current to 15% of the programmed maximum (e.g., 300mA for a 2A setup). Charging resumes at full rate once BAT exceeds 2.9V + 90mV hysteresis. If preconditioning fails within 22.5 minutes, a bad-battery fault is asserted.
Can LT3650IDD-4.1#TRPBF operate without an NTC thermistor?
Yes. The NTC pin on LT3650IDD-4.1#TRPBF is optional: leaving it unconnected disables temperature monitoring. The IC will still perform full CC/CV charging, but without thermal fault protection. For safety-critical applications, a 10kΩ B=3380 NTC must be connected from NTC to GND to enable automatic charge suspension above 40°C or below 0°C.
What is the purpose of the CLP pin on LT3650IDD-4.1#TRPBF?
The CLP pin on LT3650IDD-4.1#TRPBF enables system-level input current limiting. By connecting a sense resistor between CLP and VIN, the IC dynamically reduces battery charge current to ensure total input current (charger + system load) does not exceed a set threshold-critical for USB PD, PoE, or fused 12V supply designs.
Does LT3650IDD-4.1#TRPBF require an external blocking diode on the VIN line?
No. LT3650IDD-4.1#TRPBF includes internal reverse-voltage protection and can be connected directly to the input supply without an external blocking diode. This eliminates ~0.3V forward drop and associated heat, simplifying design and improving efficiency-especially important in high-current or thermally constrained applications.
LT3650IDD-4.1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 32V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LT3650IDD-4.1#TRPBF FAQ
1.How can I place an order for LT3650IDD-4.1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650IDD-4.1#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 LT3650IDD-4.1#TRPBF reliable?
The price and inventory of LT3650IDD-4.1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3650IDD-4.1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3650IDD-4.1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650IDD-4.1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650IDD-4.1#TRPBF?
LT3650IDD-4.1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650IDD-4.1#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 LT3650IDD-4.1#TRPBF?
For technical support, including LT3650IDD-4.1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650IDD-4.1#TRPBF requirements.
6.How does Aetrix verify that LT3650IDD-4.1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3650IDD-4.1#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 LT3650IDD-4.1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3650IDD-4.1#TRPBF?
All LT3650IDD-4.1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650IDD-4.1#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 LT3650IDD-4.1#TRPBF part is unused and in its original packaging.
Return procedure for LT3650IDD-4.1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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