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Analog Devices Inc. LT3650IDD-8.4#PBF
- Part No.:
- LT3650IDD-8.4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3650IDD-8.4#PBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LT3650IDD-8.4#PBF from Analog Devices (formerly Linear Technology) is a monolithic 2-cell Li-Ion/Polymer battery charger IC with 9V–32V input range, 8.4V float voltage, and up to 2A programmable charge current. It integrates a 2A internal switch, average current mode control, C/10 or timer-based termination, and NTC temperature monitoring. It targets industrial handheld instruments and 12V–24V automotive charging systems.
For engineers reviewing the LT3650IDD-8.4#PBF datasheet, LT3650IDD-8.4#PBF pinout, LT3650IDD-8.4#PBF application, or LT3650IDD-8.4#PBF equivalent, key selection considerations include its 8.4V float voltage accuracy (±0.5%), 12-pin DFN package (3mm × 3mm), preconditioning for deeply discharged batteries (<5.8V), bad-battery detection, and auto-recharge at 97.5% of float voltage.
Technical Context
The LT3650IDD-8.4#PBF implements a fixed-frequency (1MHz) average current mode step-down architecture with bootstrapped gate drive for its integrated 2A N-channel switch. Its control loop directly regulates average inductor current via the SENSE–BAT differential voltage, with ITH error voltage clamped at 1V to enforce 100mV sense threshold and 2A max current.
It supports dual termination modes: C/10 detection (7.5–12.5mV sense threshold) or user-programmable safety timer (3-hour typical via 0.68µF capacitor on TIMER pin). Preconditioning activates below 5.8V BAT, reducing charge current to 15% of programmed IMAX; NTC monitoring disables charging if VNTC < 0.29V (>40°C) or >1.36V (<0°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 8.4V ±0.5% - precisely regulates 2-cell Li-ion stack to full charge without overvoltage risk. |
| Max Charge Current | 2A - set by external sense resistor (RSENSE = 0.1V / IMAX); enables fast recharge for 2600–5000mAh packs. |
| Input Voltage Range | 9V to 32V - supports 12V/24V automotive and industrial supplies; 11.5V startup minimum ensures reliable cold-cranking operation. |
| C/10 Detection Accuracy | ±2.5% - ensures precise end-of-charge detection at 200mA for 2A program, minimizing undercharge or overcharge. |
| Standby Current | 85µA - maintains low quiescent draw after charge termination, preserving system battery life during idle. |
| NTC Monitoring Range | 0.29V–1.36V - corresponds to ~0°C–40°C for standard 10kΩ B=3380 thermistor, enabling safe thermal envelope enforcement. |
| Timer Accuracy | ±10% - guarantees predictable 3-hour full-cycle timeout with 0.68µF capacitor, critical for production consistency. |
Pinout & Package
LT3650IDD-8.4#PBF is housed in a 12-lead (3mm × 3mm) 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 9V–32V; powers internal circuitry and switch; requires ≥11.5V or BOOST–SW > 2V for startup. |
| CLP (2) | System current limit monitor | Enables dynamic reduction of charge current to maintain total input current budget; connect sense resistor between CLP and VIN. |
| SHDN (3) | Enable/disable control | 1.225V threshold with 120mV hysteresis; pulls VIN current to 15µA in shutdown; allows UVLO integration via resistor divider. |
| CHRG (4) | Open-collector status output | Pulled low during active charging or fault; high-impedance when terminated; compatible with VIN-level pull-ups. |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC fault, bad-battery condition, or timer expiration; remains high-impedance otherwise. |
| TIMER (6) | Charge cycle timer programming | Connect capacitor to GND to set full-cycle timeout (tEOC = CTIMER × 4.4×10⁶); ground to disable timer-based termination. |
| RNG/SS (7) | Charge current programming & soft-start | Sources 50µA; VRNG/SS sets IMAX via VSENSE = 0.1 × VRNG/SS; capacitor enables controlled current ramp-up. |
| NTC (8) | Temperature sensor input | Sources 50µA for 10kΩ thermistor; disables charging outside 0.29V–1.36V range; includes 5°C hysteresis per threshold. |
| BAT (9) | Battery voltage feedback | Directly monitors cell stack voltage; sets float regulation point; triggers auto-recharge at 97.5% of VFLT. |
| SENSE (10) | Current sense input | Measures voltage across external RSENSE (SENSE–BAT); 100mV = 2A; bias current <0.1µA post-termination. |
| BOOST (11) | Bootstrap supply for switch driver | Drives gate above VIN; requires ≥1µF capacitor to SW; operates 0–8.5V relative to SW pin. |
| SW (12) | Switch node output | Emitter of internal 2A N-channel switch; connects to inductor; on-resistance ~0.175Ω enables high efficiency. |
| SGND (13) | Signal and thermal ground | Exposed pad; must be soldered to PCB ground plane for thermal management and reference stability. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 8.4V float voltage | 0.5% accuracy ensures optimal 2-cell Li-ion longevity and capacity retention without manual calibration. |
| User-selectable C/10 or timer termination | Enables design flexibility: precision current-based cutoff or time-bound "top-off" for consistent batch charging. |
| Auto-preconditioning below 5.8V | Trickle-charges deeply discharged cells at 15% IMAX to prevent damage before full-rate charging resumes. |
| Bad-battery detection with auto-reset | Halts charging and asserts FAULT if battery fails to reach 5.8V within 22.5 minutes (1/8 of 3h timer), then clears on battery replacement. |
| Binary-coded open-collector status outputs | CHRG and FAULT pins provide unambiguous, level-compatible signals for MCU GPIO monitoring without additional logic. |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Charging Systems |
|---|---|
|
Use Scenario: Portable test equipment powered by 2-cell Li-ion packs, operating in field environments with wide ambient temperature swings and variable input sources. IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, thermal safety, and automatic reconditioning after deep discharge. Use Value: Enables reliable multi-shift operation with 8.4V float accuracy and NTC-based thermal cutoff, eliminating manual intervention during battery maintenance. |
Use Scenario: In-vehicle cradle chargers for rugged tablets or communication devices connected to truck or bus 12V/24V systems with high ripple and cold-cranking transients. IC Role / Device Role / Timing Role: High-voltage input charger with 11.5V startup and 40V absolute max rating, providing robust charging despite unstable vehicle power rails. Use Value: Maintains charging functionality during engine cranking (VIN dip) and rejects load dump spikes, ensuring uninterrupted power to mission-critical devices. |
| Desktop Cradle Chargers | Notebook Computers (Auxiliary Charging) |
|
Use Scenario: Docking station that charges multiple portable devices simultaneously using shared 24V DC input, requiring precise per-battery regulation. IC Role / Device Role / Timing Role: Standalone charger IC delivering regulated 8.4V float and 2A current to individual 2-cell packs, with independent status signaling. Use Value: Supports parallel charging of diverse devices with binary CHRG/FAULT outputs simplifying host microcontroller interface and fault logging. |
Use Scenario: Secondary charging path in thin-and-light notebooks where main adapter cannot fully support peak CPU/GPU loads and battery top-off. IC Role / Device Role / Timing Role: Supplemental charger managing 2-cell pack during high-power usage, leveraging CLP pin to dynamically throttle charge current based on system load. Use Value: Prevents input overcurrent trips by coordinating charge current with system power demand via CLP servo loop, extending runtime without adapter upgrade. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-cell Li-ion charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652EMSE-8.4#PBF | MSOP-16 package; adds USB-compatible input current limit (100mA–1.5A) and PROG pin for analog current programming; no CLP pin. | Targeted at USB-powered or lower-input-current designs; lacks system-level current limiting via CLP. | Select LT3652EMSE-8.4#PBF when USB compliance or finer current resolution is required; avoid if CLP-based system load coordination is needed. |
| BQ24618RGER | Texas Instruments part; 8.4V float; 2.5A max; supports external FET; no integrated switch; requires external MOSFET and bootstrap diode. | Higher current scalability and thermal separation; increases BOM count and layout complexity versus monolithic LT3650IDD-8.4#PBF. | Select BQ24618RGER only when >2A current or discrete FET control is mandatory; LT3650IDD-8.4#PBF offers lower component count and smaller footprint. |
Compared with LT3652EMSE-8.4#PBF, LT3650IDD-8.4#PBF provides integrated system current limiting via CLP but lacks USB compliance; compared with BQ24618RGER, it delivers full monolithic integration at 2A but cannot scale beyond that without redesign.
Availability
LT3650IDD-8.4#PBF is available at Aetrix Electronics and suitable for industrial handheld instruments, 12V–24V automotive charging systems, and desktop cradle chargers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3650IDD-8.4#PBF 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 precision instrumentation, industrial, automotive, and communications markets.
The LT3650 product line delivers monolithic high-voltage Li-ion chargers optimized for 9V–32V input applications such as automotive accessories, industrial portables, and multi-cell battery packs where minimal external components and robust safety features are essential.
FAQ
What is the exact float voltage specification for LT3650IDD-8.4#PBF?
The LT3650IDD-8.4#PBF is factory-trimmed to deliver a nominal 8.4V float voltage with ±0.5% accuracy over temperature (–40°C to 85°C). This value is confirmed in the Electrical Characteristics table under VBAT(FLT) for LT3650-8.4, with min/typ/max values of 8.36V/8.4V/8.44V at 25°C and full-range guarantee of 8.32V to 8.48V.
Does LT3650IDD-8.4#PBF support automatic recharge, and at what threshold?
Yes, LT3650IDD-8.4#PBF supports automatic recharge when the battery voltage drops 2.5% below the float voltage - i.e., at 97.5% of VFLT. For the 8.4V variant, this corresponds to a recharge trigger at 8.2V. This behavior is inherent to the IC's analog control loop and requires no external configuration.
How is the maximum charge current programmed on LT3650IDD-8.4#PBF?
The maximum charge current for LT3650IDD-8.4#PBF is set by an external sense resistor (RSENSE) between SENSE and BAT pins, where RSENSE = 0.1V / IMAX. For example, a 50mΩ resistor programs 2A. The RNG/SS pin can dynamically scale this value downward (e.g., for soft-start), but the upper limit is fixed by RSENSE.
What is the function of the CLP pin on LT3650IDD-8.4#PBF, and how is it used?
The CLP pin on LT3650IDD-8.4#PBF enables system-level input current limiting: by connecting a sense resistor between CLP and VIN, the IC reduces charge current to hold total input current at a programmed level. If unused, CLP must be tied to VIN. This feature is unique to the LT3650 family and not present in most competing chargers.
Can LT3650IDD-8.4#PBF operate with input voltages below 11.5V?
LT3650IDD-8.4#PBF requires either VIN ≥ 11.5V or BOOST–SW > 2V to start switching. Below 11.5V, startup is only possible if the bootstrap capacitor is precharged - for example, via a diode from BAT or an auxiliary source. The absolute minimum operating VIN is 9V, but sustained operation below 11.5V demands careful BOOST supply design.
LT3650IDD-8.4#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 8.4V
- 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-8.4#PBF FAQ
1.How can I place an order for LT3650IDD-8.4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650IDD-8.4#PBF 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-8.4#PBF reliable?
The price and inventory of LT3650IDD-8.4#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3650IDD-8.4#PBF is usually 5 days.
3.What payment methods are accepted for LT3650IDD-8.4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650IDD-8.4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650IDD-8.4#PBF?
LT3650IDD-8.4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650IDD-8.4#PBF 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-8.4#PBF?
For technical support, including LT3650IDD-8.4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650IDD-8.4#PBF requirements.
6.How does Aetrix verify that LT3650IDD-8.4#PBF is sourced from the original manufacturer or authorized distributors?
All LT3650IDD-8.4#PBF 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-8.4#PBF meets industry standards.
7.What is the process for return or replacement of LT3650IDD-8.4#PBF?
All LT3650IDD-8.4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650IDD-8.4#PBF, 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-8.4#PBF part is unused and in its original packaging.
Return procedure for LT3650IDD-8.4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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