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Analog Devices Inc. LT3650IMSE-8.4#TRPBF
- Part No.:
- LT3650IMSE-8.4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3650IMSE-8.4#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
LT3650IMSE-8.4#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2-cell Li-Ion/Polymer battery charger IC with integrated 2A switch, operating from 9V to 32V input and delivering 8.4V float voltage. It features programmable C/10 or timer-based charge termination, NTC temperature monitoring, bad-battery detection, and auto-recharge at 97.5% of float voltage-designed for industrial handheld instruments and 12V–24V automotive charging systems.
For engineers reviewing the LT3650IMSE-8.4#TRPBF datasheet, LT3650IMSE-8.4#TRPBF pinout, LT3650IMSE-8.4#TRPBF application, or LT3650IMSE-8.4#TRPBF equivalent, key selection criteria include its 8.4V fixed float voltage, 12-pin MSOP package with exposed thermal pad, ±0.5% float voltage accuracy, 5% charge current accuracy, and support for system current limiting via CLP pin.
Technical Context
The LT3650IMSE-8.4#TRPBF implements average current mode control with a fixed 1MHz switching frequency, using an internal bootstrapped gate drive (BOOST pin) to saturate its integrated 2.5A switch. Its precision voltage error amplifier regulates battery voltage against a trimmed 8.4V reference, while the current error amplifier servoing to VSENSE–VBAT enables accurate CC/CV charging.
Charge termination is configurable: C/10 detection triggers when ITH falls to 0.1V (corresponding to 10% of programmed IMAX), or via a user-programmable timer (e.g., 3-hour full cycle with 0.68µF capacitor). Preconditioning activates below 5.8V battery voltage, reducing charge current to 15% of maximum until threshold is crossed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 8.4V ±0.5% - precisely regulated final charge voltage for 2-cell Li-ion stacks; ensures full capacity without overvoltage stress. |
| Max Charge Current | Up to 2A - set externally via sense resistor (RSENSE = 0.1V/IMAX); supports fast charging in space-constrained systems. |
| Input Voltage Range | 9V to 32V (11.5V min start-up) - compatible with 12V/24V industrial and automotive supplies; 40V absolute max withstand. |
| Termination Options | C/10 detection or programmable timer - enables flexible safety policies: current-based cutoff or time-limited top-off for aging batteries. |
| NTC Monitoring | 10kΩ B=3380 thermistor interface - disables charging if VNTC < 0.29V (T > 40°C) or > 1.36V (T < 0°C); includes 5°C hysteresis per threshold. |
| Standby Current | 85µA - ultra-low quiescent draw after charge completion; minimizes parasitic battery discharge during long-term connection. |
| Package | 12-lead MSOP with exposed thermal pad - 3mm × 3mm footprint; θJA = 43°C/W enables high-power operation without heatsink. |
Pinout & Package
LT3650IMSE-8.4#TRPBF is housed in a 12-lead plastic MSOP package (3mm × 3mm, 0.65mm pitch) with exposed thermal pad (Pin 13) soldered to PCB ground for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 9V–32V; powers internal circuitry and switch; requires ≥10µF low-ESR decoupling. |
| CLP (2) | System current limit monitor | Enables dynamic charge current reduction to maintain total input current budget; connect sense resistor between CLP and VIN. |
| SHDN (3) | Enable/disable control | 1.225V rising threshold with 120mV hysteresis; pulls VIN current to 15µA in shutdown. |
| CHRG (4) | Open-collector status output | Pulled low during active charging; high-impedance at termination; sinks up to 10mA. |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC fault, bad-battery condition, or timer timeout; high-impedance otherwise. |
| TIMER (6) | Charge cycle timer programming | Connect capacitor to GND to set full-cycle timeout (e.g., 0.68µF = 3 hours); tie to GND to disable timer. |
| RNG/SS (7) | Charge current programming & soft-start | Sources 50µA; sets max ICHG via voltage (VRNG/SS × 0.1 = VSENSE–BAT); supports RC soft-start. |
| NTC (8) | Battery temperature sensing | Biases external 10kΩ NTC; monitors voltage range 0.29V–1.36V; suspends charging outside safe zone. |
| BAT (9) | Battery voltage feedback | Direct connection to battery cathode; senses float voltage and triggers auto-recharge at 97.5% VFLT. |
| SENSE (10) | Current sense input | Connects to high-side of RSENSE; 100mV full-scale corresponds to 2A max; bias current <0.1µA post-termination. |
| BOOST (11) | Bootstrap gate drive supply | Connect 1µF+ capacitor to SW; enables low RDS(on) switch operation; referenced to SW pin. |
| SW (12) | Switch node output | Drives external inductor; integrates 2.5A switch with 350mV drop at 2A; requires careful layout for EMI control. |
| SGND (13) | Signal and thermal ground | Exposed pad; must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input current limit | CLP pin enables real-time coordination between battery charge current and system load, preventing input supply overload. |
| Auto-precondition & bad-battery detection | Activates trickle-charge below 5.8V; halts charging and asserts FAULT if battery fails to reach precondition threshold within 22.5 minutes (1/8 of 3h timer). |
| Binary-coded open-collector status outputs | CHRG and FAULT pins provide unambiguous, level-sensitive indication of charge state, thermal faults, and battery health without external logic. |
| Dynamic charge rate programming | RNG/SS pin allows real-time adjustment of IMAX (e.g., for thermal derating) or controlled soft-start to limit inrush current. |
| High-accuracy float regulation | 0.5% tolerance on 8.4V reference ensures cell-level voltage compliance across temperature (–40°C to 85°C). |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Charging |
|---|---|
|
Use Scenario: Portable test equipment powered by 2-cell Li-ion packs, requiring reliable charging from vehicle 12V/24V systems during field service. IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, NTC-based thermal safety, and auto-restart after battery replacement. Use Value: Eliminates need for external current-sense amplifiers or discrete timers; 8.4V float voltage matches standard 2S Li-ion chemistry. |
Use Scenario: In-vehicle cradle charger for ruggedized tablets used in construction or logistics fleets. IC Role / Device Role / Timing Role: High-voltage charger IC interfacing directly to automotive battery rail; CLP pin enforces total system current limit under engine-off conditions. Use Value: Withstands 32V transients; 11.5V startup ensures operation even with weak batteries; timer-based termination prevents overcharging in hot environments. |
| Desktop Cradle Chargers | Notebook Computers (Docking) |
|
Use Scenario: Multi-unit charging station for warehouse scanners, where consistent full-charge cycles extend battery life across hundreds of devices. IC Role / Device Role / Timing Role: Standalone charger controller with binary status outputs enabling host MCU to monitor charge progress and faults per port. Use Value: C/10 termination ensures precise end-of-charge detection; 85µA standby current prevents overnight battery drain when docked but idle. |
Use Scenario: Docking station providing supplemental charging to notebook computers via proprietary connector. IC Role / Device Role / Timing Role: Secondary charging path that operates only when main AC adapter is unavailable; uses BAT pin feedback for seamless voltage handoff. Use Value: Auto-recharge at 97.5% float voltage maintains optimal state-of-charge without user intervention; NTC monitoring adds safety layer beyond host system controls. |
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#TRPBF | Higher 32V input rating, integrated power-path management, and USB-compatible input current limit; no CLP pin for system current control. | Designed for USB PD or adapter-input systems requiring automatic input source selection; lacks direct analog system current servo capability. | Select LT3652EMSE-8.4#TRPBF when input source arbitration or USB compliance is required; retain LT3650IMSE-8.4#TRPBF for dedicated high-voltage industrial supplies with CLP-based load sharing. |
| BQ24610RGER | TI part with 8.4V float, 3A max charge current, and adjustable termination timer; requires external MOSFETs; no integrated switch or NTC monitoring. | Targeted at cost-sensitive designs where board area is less constrained; demands additional FETs, drivers, and thermistor circuitry. | Choose BQ24610RGER for higher current scalability or multi-chemistry flexibility; choose LT3650IMSE-8.4#TRPBF for monolithic integration, smaller footprint, and built-in safety features. |
Compared with LT3652EMSE-8.4#TRPBF, the LT3650IMSE-8.4#TRPBF offers superior system-level current coordination via CLP but lacks power-path management; versus BQ24610RGER, it delivers full integration at lower component count but with fixed 2A switch limit.
Availability
LT3650IMSE-8.4#TRPBF 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 traceability.
Supply support for LT3650IMSE-8.4#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and medical markets.
The LT3650IMSE-8.4#TRPBF belongs to Linear's high-voltage monolithic battery charger product line, engineered specifically for robust, low-component-count charging solutions in 9V–32V input environments with stringent safety and accuracy requirements.
FAQ
What is the exact float voltage of the LT3650IMSE-8.4#TRPBF?
The LT3650IMSE-8.4#TRPBF has a factory-trimmed float voltage of 8.4V, specified as 8.36V (min) to 8.44V (max) at 25°C, with ±0.5% accuracy over –40°C to 85°C. This value is fixed and not adjustable-it is distinct from the LT3650IMSE-8.2#TRPBF, which targets 8.2V. The 8.4V setting matches standard 2-cell Li-ion battery chemistry requirements.
Does the LT3650IMSE-8.4#TRPBF support both C/10 and timer-based charge termination?
Yes, the LT3650IMSE-8.4#TRPBF supports dual termination modes. C/10 termination occurs automatically when charge current drops to 10% of the programmed maximum; timer-based termination is enabled by connecting a capacitor to the TIMER pin (e.g., 0.68µF yields ~3 hours). Both methods can coexist-the timer extends charging beyond C/10 for top-off, and bad-battery detection is only active when the timer is enabled.
How does the CLP pin function in the LT3650IMSE-8.4#TRPBF?
The CLP pin on the LT3650IMSE-8.4#TRPBF enables system-level current limiting by monitoring input supply current. When a sense resistor connects CLP to VIN, the IC dynamically reduces battery charge current to maintain total input current at the programmed limit (e.g., 50mV across resistor = 1A system cap). If unused, CLP must be tied to VIN to disable this feature and allow full charge current.
What NTC thermistor values are compatible with the LT3650IMSE-8.4#TRPBF?
The LT3650IMSE-8.4#TRPBF is designed for use with a 10kΩ, B = 3380 NTC thermistor connected between the NTC pin and ground. The IC sources 50µA, producing 0.5V at 25°C. Charging halts if voltage falls below 0.29V (≈40°C) or rises above 1.36V (≈0°C), with ~5°C hysteresis. External impedance must stay below 250kΩ for reliable operation.
What is the thermal performance of the LT3650IMSE-8.4#TRPBF in MSOP package?
The LT3650IMSE-8.4#TRPBF in 12-lead MSOP package has θJA = 43°C/W and θJC = 3°C/W. With the exposed pad (Pin 13) properly soldered to a 1-in² copper pour, it sustains continuous 2A charging at ambient temperatures up to 70°C. Junction temperature must remain ≤125°C; thermal foldback reduces IMAX above ~100°C to protect reliability.
LT3650IMSE-8.4#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-MSOP-EP
LT3650IMSE-8.4#TRPBF FAQ
1.How can I place an order for LT3650IMSE-8.4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650IMSE-8.4#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 LT3650IMSE-8.4#TRPBF reliable?
The price and inventory of LT3650IMSE-8.4#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3650IMSE-8.4#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3650IMSE-8.4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650IMSE-8.4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650IMSE-8.4#TRPBF?
LT3650IMSE-8.4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650IMSE-8.4#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 LT3650IMSE-8.4#TRPBF?
For technical support, including LT3650IMSE-8.4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650IMSE-8.4#TRPBF requirements.
6.How does Aetrix verify that LT3650IMSE-8.4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3650IMSE-8.4#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 LT3650IMSE-8.4#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3650IMSE-8.4#TRPBF?
All LT3650IMSE-8.4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650IMSE-8.4#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 LT3650IMSE-8.4#TRPBF part is unused and in its original packaging.
Return procedure for LT3650IMSE-8.4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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