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Analog Devices Inc. LT3650IMSE-8.4#PBF
- Part No.:
- LT3650IMSE-8.4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3650IMSE-8.4#PBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,162
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Product details
Overview
LT3650IMSE-8.4#PBF 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 - used in 12V–24V industrial handhelds and automotive cradle chargers.
For engineers reviewing the LT3650IMSE-8.4#PBF datasheet, LT3650IMSE-8.4#PBF pinout, LT3650IMSE-8.4#PBF application, or LT3650IMSE-8.4#PBF equivalent, key selection considerations include its 8.4V float voltage accuracy (±0.5%), 2A max charge current programmability via sense resistor, 1MHz fixed-frequency average current mode control, thermal foldback behavior, and MSOP-12 package compatibility with PCB layout constraints for high-voltage battery charging systems.
Technical Context
The LT3650IMSE-8.4#PBF implements a constant-current/constant-voltage (CC/CV) charging profile using average current mode control with a 1MHz fixed-frequency buck architecture. Its internal 2A switch is driven by a bootstrapped BOOST rail referenced to SW, enabling low on-resistance operation (350mV drop at 2A) and high efficiency across the 9V–32V input range.
Charge termination is configurable: either when sensed current falls to C/10 (7.5–12.5mV across SENSE–BAT), or after a user-programmed timer interval (e.g., 3 hours with 0.68µF on TIMER). Preconditioning activates below 5.8V BAT, reducing charge current to 15% of programmed maximum, while NTC monitoring suspends charging if voltage at NTC pin falls outside 0.29V–1.36V (≈0°C–40°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 | Up to 2A - set externally via sense resistor (RSENSE = 0.1V / IMAX); enables fast recharge in space-constrained systems. |
| Input Voltage Range | 9V to 32V (11.5V min start-up) - supports direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Termination Options | C/10 detection (7.5–12.5mV threshold) or programmable timer (e.g., 3 hr with 0.68µF) - provides flexibility for battery chemistry and safety compliance. |
| NTC Monitoring | 50µA bias current into NTC pin; 0.29V–1.36V active window - enables safe charging only within validated temperature band (≈0°C–40°C). |
| Standby Current | 85µA - minimizes system power draw when battery is fully charged and no recharge is needed. |
| Switch On-Drop | 350mV at 2A - reduces conduction loss and thermal stress during high-current CC phase. |
Pinout & Package
LT3650IMSE-8.4#PBF is housed in a 12-lead plastic MSOP package (3mm × 3mm, 0.75mm height) with exposed thermal pad (Pin 13 = SGND). The package supports high-power dissipation (θJA = 43°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 ≥10µF low-ESR input capacitor. |
| CLP (2) | System current limit monitor | Enables dynamic charge current reduction to maintain total system input current; connect sense resistor between CLP and VIN. |
| SHDN (3) | Enable/disable control | 1.225V threshold (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; high-impedance when terminated; indicates C/10 event or temperature fault. |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC out-of-range, bad-battery detection, or timer timeout; signals non-recoverable failure conditions. |
| TIMER (6) | Charge cycle timing capacitor | Connects to GND via capacitor (e.g., 0.68µF → 3 hr full cycle); disables timer when tied to GND for C/10-only termination. |
| RNG/SS (7) | Charge current programming & soft-start | Sources 50µA; sets max current via voltage (VRNG/SS × IMAX); supports RC soft-start to limit inrush. |
| NTC (8) | Battery temperature sensing | Biases external 10kΩ NTC; monitors voltage (0.29V–1.36V) to suspend charging outside safe thermal zone. |
| BAT (9) | Battery voltage feedback | Direct connection to battery anode; senses float voltage (8.4V) and triggers auto-recharge at 97.5% (8.2V). |
| 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) | Bootstrap gate drive supply | Connected to SW via ≥1µF capacitor; supplies >8.5V headroom for switch saturation and low RDS(on). |
| SW (12) | Switch node output | Drives external inductor; switches between VIN and GND; peak voltage ≤40V; on-resistance ~0.175Ω. |
| SGND (13) | Signal & thermal ground | Exposed pad; must be soldered to PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable float voltage | 8.4V with ±0.5% accuracy ensures precise 2-cell Li-ion termination without cell imbalance risk. |
| Auto-preconditioning | Activates below 5.8V BAT and limits current to 15% of programmed max - safely recovers deeply discharged batteries. |
| Binary-coded status outputs | CHRG and FAULT pins provide unambiguous real-time state reporting (charging, terminated, NTC fault, bad-battery) to host MCU. |
| Dynamic charge rate control | RNG/SS pin enables real-time current adjustment or soft-start via voltage or RC network - prevents inrush and supports adaptive charging. |
| Bad-battery detection | Triggers if battery fails to reach 5.8V within 22.5 min (1/8 of 3-hr timer) - halts charging and asserts FAULT to prevent unsafe operation. |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Cradle Chargers |
|---|---|
|
Use Scenario: Portable test equipment powered by 2-cell Li-ion packs, recharged via 24V vehicle power outlet. IC Role / Device Role / Timing Role: Primary battery charger IC managing CC/CV profile, preconditioning, and NTC-based thermal cutoff. Use Value: Enables reliable field recharging without external supervision; 8.4V float voltage matches nominal 2S Li-ion stack; 32V abs max withstands automotive load dump transients. |
Use Scenario: In-vehicle docking station for tablets or ruggedized mobile devices with hot-swap battery support. IC Role / Device Role / Timing Role: Monolithic charger controlling charge current, detecting failed batteries, and signaling status to vehicle CAN interface. Use Value: Auto-recharge at 97.5% float voltage maintains readiness; CLP pin allows shared input current budgeting with other vehicle subsystems. |
| Desktop Cradle Chargers | Notebook Computers (Embedded Charging) |
|
Use Scenario: AC-powered desktop dock that charges removable 2-cell Li-ion battery packs for medical or logistics scanners. IC Role / Device Role / Timing Role: Standalone charger IC providing safety-critical functions: timer-based termination, bad-battery lockout, and open-collector status signaling. Use Value: Eliminates need for external microcontroller supervision; binary CHRG/FAULT outputs simplify host firmware logic and reduce BOM count. |
Use Scenario: Embedded secondary charging path in notebook platforms where main PMIC handles primary battery, but auxiliary 2S pack powers peripherals. IC Role / Device Role / Timing Role: Dedicated high-voltage charger IC interfacing directly to battery terminals, isolated from main system power domain. Use Value: 9V–32V input range allows reuse of existing notebook adapter; MSOP-12 footprint fits tight layout constraints near battery connector. |
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 |
|---|---|---|---|
| LT3652IMSE-8.4#PBF | Higher 32V absolute max input rating; identical 8.4V float, C/10/timer termination, and MSOP-12 package. | Supports wider transient tolerance (e.g., 40V load dump) without external clamping; same PCB footprint. | Select LT3652IMSE-8.4#PBF when system-level transients exceed 32V or long-term reliability under harsh voltage surges is required. |
| BQ24610RGER | TI part with 8.4V float, 2A max, but uses voltage-mode control (not average current mode); no built-in NTC monitoring. | Requires external thermistor circuit and comparator for temperature safety; different loop stability requirements. | Choose BQ24610RGER only if TI ecosystem alignment or specific voltage-mode loop design preference outweighs need for integrated NTC and current-mode robustness. |
Compared with LT3650IMSE-8.4#PBF, LT3652IMSE-8.4#PBF offers enhanced input surge resilience while maintaining pin and function compatibility, whereas BQ24610RGER trades integrated safety features for vendor-specific toolchain advantages and requires added external components for thermal protection.
Availability
LT3650IMSE-8.4#PBF is available at Aetrix Electronics and suitable for industrial handheld instruments, 12V–24V automotive cradle chargers, and desktop cradle chargers requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3650IMSE-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) designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications systems.
The LT3650IMSE-8.4#PBF belongs to Linear's high-voltage monolithic battery charger product line, engineered specifically for 2-cell Li-ion applications in 12V–24V infrastructure where minimal external components, integrated safety, and robust thermal management are critical.
FAQ
What is the exact float voltage of the LT3650IMSE-8.4#PBF and how tightly is it regulated?
The LT3650IMSE-8.4#PBF delivers a nominal 8.4V float voltage with ±0.5% accuracy over temperature and line conditions. This specification ensures precise termination for 2-cell Li-ion batteries without overvoltage stress, and is achieved via a trimmed internal reference and low-drift error amplifier. The LT3650IMSE-8.4#PBF maintains this accuracy across –40°C to 85°C ambient, supporting reliable operation in industrial environments.
Can the LT3650IMSE-8.4#PBF be used with a 12V input supply, and what is the minimum startup voltage?
Yes, the LT3650IMSE-8.4#PBF operates from 9V to 32V input, making it compatible with standard 12V systems. Its minimum startup voltage is 11.5V - below which the device will not initiate switching unless the BOOST–SW differential exceeds 2V. For reliable 12V operation, ensure input stays above 11.5V under load, and use adequate input capacitance to suppress dips during high-current pulses. The LT3650IMSE-8.4#PBF remains functional down to 9V once running.
How does the LT3650IMSE-8.4#PBF implement bad-battery detection, and what happens when it triggers?
The LT3650IMSE-8.4#PBF detects bad batteries by monitoring whether the battery voltage reaches 5.8V during preconditioning within one-eighth of the programmed timer duration (e.g., 22.5 minutes for a 3-hour timer). If not, it asserts FAULT low and halts charging. The LT3650IMSE-8.4#PBF also auto-resets upon battery replacement - a new charge cycle starts immediately when a valid battery is inserted, provided SHDN is high and NTC is in range.
Does the LT3650IMSE-8.4#PBF support automatic recharge, and at what threshold does it trigger?
Yes, the LT3650IMSE-8.4#PBF supports automatic recharge when the battery voltage drops 2.5% below its float voltage - i.e., from 8.4V to 8.2V. This behavior is inherent and requires no external components. Once triggered, the LT3650IMSE-8.4#PBF exits standby mode and initiates a full CC/CV cycle. The 2.5% hysteresis prevents oscillation and ensures stable re-entry into charging.
What package type and thermal characteristics apply to the LT3650IMSE-8.4#PBF?
The LT3650IMSE-8.4#PBF uses a 12-lead plastic MSOP package (3mm × 3mm, 0.75mm height) with exposed thermal pad (Pin 13 = SGND). Its thermal resistance is θJA = 43°C/W and θJC = 3°C/W. To achieve rated performance, the exposed pad must be soldered to a PCB ground plane with ≥4 thermal vias. The LT3650IMSE-8.4#PBF junction temperature must remain ≤125°C under all operating conditions.
LT3650IMSE-8.4#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3650IMSE-8.4#PBF FAQ
1.How can I place an order for LT3650IMSE-8.4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650IMSE-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 LT3650IMSE-8.4#PBF reliable?
The price and inventory of LT3650IMSE-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 LT3650IMSE-8.4#PBF is usually 5 days.
3.What payment methods are accepted for LT3650IMSE-8.4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650IMSE-8.4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650IMSE-8.4#PBF?
LT3650IMSE-8.4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650IMSE-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 LT3650IMSE-8.4#PBF?
For technical support, including LT3650IMSE-8.4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650IMSE-8.4#PBF requirements.
6.How does Aetrix verify that LT3650IMSE-8.4#PBF is sourced from the original manufacturer or authorized distributors?
All LT3650IMSE-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 LT3650IMSE-8.4#PBF meets industry standards.
7.What is the process for return or replacement of LT3650IMSE-8.4#PBF?
All LT3650IMSE-8.4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650IMSE-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 LT3650IMSE-8.4#PBF part is unused and in its original packaging.
Return procedure for LT3650IMSE-8.4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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