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Analog Devices Inc. LT3650EMSE-4.1#PBF
- Part No.:
- LT3650EMSE-4.1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3650EMSE-4.1#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:102
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Product details
Overview
LT3650EMSE-4.1#PBF 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 - used in 12V–24V automotive cradle chargers and industrial handheld instruments.
For engineers reviewing the LT3650EMSE-4.1#PBF datasheet, LT3650EMSE-4.1#PBF pinout, LT3650EMSE-4.1#PBF application, or LT3650EMSE-4.1#PBF equivalent, key selection considerations include its 4.1V fixed float voltage, MSOP-12 package with exposed thermal pad, 1MHz average current mode control, ±0.5% float voltage accuracy, and compatibility with system-level input current limiting via CLP pin.
Technical Context
The LT3650EMSE-4.1#PBF implements a fixed-frequency (1MHz) average current mode buck regulator architecture optimized for single-cell Li-Ion charging. Its internal 2A switch is driven by a bootstrapped BOOST rail referenced to SW, enabling low on-resistance operation without external blocking diodes.
Charge control integrates dual termination schemes: C/10 detection (7.5–12.5mV sense threshold) and user-programmable safety timer (e.g., 3-hour full cycle with 0.68µF capacitor). Preconditioning activates below 2.9V BAT, reducing charge current to 15% of programmed maximum until voltage rises above 2.99V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 32V - supports direct connection to 12V/24V automotive and industrial supplies without pre-regulation. |
| Float Voltage | 4.10V ±0.5% - precisely regulated output for Li-Ion cells requiring 4.1V nominal full-charge voltage. |
| Max Charge Current | Up to 2A - set externally via SENSE–BAT resistor; 100mV full-scale sense voltage enables accurate current programming. |
| Termination Method | C/10 detection or 3-hour programmable timer - selectable via TIMER pin configuration; enables top-off charging beyond C/10 when timer active. |
| Switching Frequency | 1MHz fixed - allows compact external magnetics and filtering; average current mode ensures stable regulation across load and line variations. |
| NTC Monitoring | Active thermistor interface (50µA bias, 0.29V–1.36V valid range) - suspends charging outside safe temperature window (≈0°C–40°C). |
| Standby Current | 85µA - ultra-low quiescent draw after charge termination preserves system battery life during idle periods. |
Pinout & Package
LT3650EMSE-4.1#PBF is housed in a 12-lead plastic MSOP package (3mm × 4.9mm) with exposed thermal pad (Pin 13 = GND), rated for –40°C to +85°C operation.
| 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 input current at programmed level (e.g., 50mV threshold). |
| 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; 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) | End-of-cycle timer programming | Connect capacitor to GND for time-based termination (e.g., 0.68µF = 3 hours); tie to GND for C/10-only mode. |
| RNG/SS (7) | Charge current programming | Sets max current via voltage (0–1V range); 50µA sourced; supports soft-start with external capacitor. |
| NTC (8) | Battery temperature monitor | 50µA bias for 10kΩ B=3380 thermistor; disables charging if voltage <0.29V (>40°C) or >1.36V (<0°C). |
| BAT (9) | Battery voltage feedback | Direct connection to battery terminal; senses float voltage; triggers auto-recharge at 97.5% VFLT. |
| SENSE (10) | Current sense input | High-side sense node; 100mV full-scale corresponds to 2A; bias current <0.1µA post-termination. |
| BOOST (11) | Bootstrap supply for switch driver | Connected to SW via ≥1µF capacitor; enables saturation of internal 2A switch for high efficiency. |
| SW (12) | Switch node output | Drives external inductor; internal switch connects SW to VIN; on-resistance ≈0.175Ω. |
| SGND (13) | Signal and thermal ground | Exposed pad must be soldered to PCB ground plane for thermal management and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| No external blocking diode required | Internal reverse-voltage protection eliminates diode loss and board space, enabling direct VIN-to-charger connection. |
| Auto-preconditioning below 2.9V | Reduces charge current to 15% of programmed maximum until battery recovers, preventing damage to deeply discharged cells. |
| Binary-coded open-collector status pins | CHRG and FAULT provide unambiguous real-time state reporting (charging, terminated, NTC fault, bad-battery) without I²C or SPI overhead. |
| Programmable input current limit via CLP | Allows shared input rail management: charger dynamically reduces ICHG to keep total system current within defined limit. |
| Thermal foldback protection | Automatically reduces IMAX as junction temperature rises, maintaining safe operation under high ambient or high-power conditions. |
Applications
| Industrial Handheld Instruments | 12V to 24V Automotive Cradle Chargers |
|---|---|
Use Scenario: Portable test equipment powered by removable Li-Ion packs, operating in field environments with variable input sources (e.g., vehicle 12V socket or bench supply). IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, preconditioning, and thermal safety for 3.7V nominal cells. Use Value: 4.1V float voltage matches cell chemistry requirements; wide VIN range accommodates engine cranking dips and alternator surges without dropout. | Use Scenario: Vehicle-mounted docking station that charges handheld radios or tablets while parked or in motion. IC Role / Device Role / Timing Role: High-efficiency buck charger with auto-restart and bad-battery detection to handle intermittent power and failed cells. Use Value: CLP pin enables coexistence with other vehicle loads; NTC monitoring prevents charging in extreme cabin temperatures. |
| Desktop Cradle Chargers | Notebook Computers (Auxiliary Charging) |
Use Scenario: AC-powered desktop dock providing fast, safe charging for professional mobile devices with hot-swap battery capability. IC Role / Device Role / Timing Role: Standalone monolithic charger IC delivering up to 2A with precise 4.1V regulation and status signaling. Use Value: MSOP-12 package fits compact cradle PCBs; 1MHz switching minimizes EMI and filter size; 85µA standby current extends dock's off-state battery life. | Use Scenario: Secondary charging path in thin-and-light notebooks where main PMIC lacks high-voltage input capability. IC Role / Device Role / Timing Role: Off-line Li-Ion charger supplementing primary power management, accepting 19V adapter input directly. Use Value: 32V absolute max rating tolerates transient overvoltages; timer-based termination ensures predictable full-charge cycles independent of battery aging. |
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 |
|---|---|---|---|
| LTC4000-4.1#PBF | External MOSFET controller (no integrated switch); supports higher currents and multi-cell configurations; requires external power stage. | Used in scalable, high-power or multi-chemistry systems where flexibility outweighs integration. | Select LTC4000-4.1#PBF only if system requires >2A, >1-cell, or custom FET selection - not a drop-in replacement. |
| MP2617GQ-Z | 4.2V fixed float voltage; 2A max; 28V max input; no CLP input current limiting or NTC interface; smaller QFN-16 package. | Suitable for cost-sensitive consumer electronics where 4.2V float and basic charging suffice. | Choose MP2617GQ-Z for simpler designs omitting system-level current sharing and temperature monitoring. |
Compared with LTC4000-4.1#PBF, LT3650EMSE-4.1#PBF offers full integration and lower BOM count but less scalability; versus MP2617GQ-Z, it provides tighter float voltage accuracy (±0.5% vs ±1%), CLP-based system current control, and robust NTC support - critical for industrial reliability.
Availability
LT3650EMSE-4.1#PBF is available at Aetrix Electronics and suitable for industrial handheld instruments, 12V to 24V automotive cradle chargers, and desktop cradle chargers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3650EMSE-4.1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3650 product line was designed specifically for high-input-voltage, monolithic Li-Ion charging in space-constrained industrial and automotive applications - emphasizing integration, safety, and robustness over 4.75V–32V inputs.
FAQ
What is the exact float voltage of the LT3650EMSE-4.1#PBF?
The LT3650EMSE-4.1#PBF has a factory-trimmed float voltage of 4.10V with ±0.5% accuracy over temperature (–40°C to +85°C). This value is fixed and non-adjustable - distinct from the LT3650-4.2 variant (4.20V). The specification is verified in the Electrical Characteristics table under VBAT(FLT) for LT3650-4.1, with typical values ranging from 4.08V to 4.12V at 25°C.
Does the LT3650EMSE-4.1#PBF require an external blocking diode on the VIN line?
No, the LT3650EMSE-4.1#PBF does not require an external blocking diode. It incorporates internal reverse-voltage protection that prevents battery discharge back into the input supply when VIN is absent or below battery voltage. This eliminates diode forward-drop losses and simplifies layout - confirmed in the "Operation" section and "Features" list of the official datasheet.
How is charge termination configured on the LT3650EMSE-4.1#PBF?
Charge termination on the LT3650EMSE-4.1#PBF is selected via the TIMER pin: connect a capacitor to GND for time-based termination (e.g., 0.68µF = 3 hours), or tie TIMER directly to GND for C/10-only mode. In C/10 mode, termination occurs when sensed current drops to 10% of programmed maximum (7.5–12.5mV across RSENSE). Both methods are mutually exclusive and hardware-configured.
What package type and thermal characteristics does the LT3650EMSE-4.1#PBF use?
The LT3650EMSE-4.1#PBF uses a 12-lead plastic MSOP package (3mm × 4.9mm) with exposed thermal pad (Pin 13 = SGND). Its thermal resistance is θJA = 43°C/W and θJC = 3°C/W. The exposed pad must be soldered to a PCB ground plane for effective heat dissipation - specified in the "Pin Configuration" diagram and Absolute Maximum Ratings table.
Can the LT3650EMSE-4.1#PBF support battery temperature monitoring?
Yes, the LT3650EMSE-4.1#PBF supports battery temperature monitoring via the NTC pin (Pin 8), which sources 50µA to bias a 10kΩ B=3380 thermistor. Charging is suspended and FAULT asserted if the NTC voltage falls below 0.29V (>40°C) or rises above 1.36V (<0°C), with ~5°C hysteresis. Leaving NTC unconnected disables the function.
LT3650EMSE-4.1#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:
- 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-MSOP-EP
LT3650EMSE-4.1#PBF FAQ
1.How can I place an order for LT3650EMSE-4.1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650EMSE-4.1#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 LT3650EMSE-4.1#PBF reliable?
The price and inventory of LT3650EMSE-4.1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3650EMSE-4.1#PBF is usually 5 days.
3.What payment methods are accepted for LT3650EMSE-4.1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650EMSE-4.1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650EMSE-4.1#PBF?
LT3650EMSE-4.1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650EMSE-4.1#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 LT3650EMSE-4.1#PBF?
For technical support, including LT3650EMSE-4.1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650EMSE-4.1#PBF requirements.
6.How does Aetrix verify that LT3650EMSE-4.1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3650EMSE-4.1#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 LT3650EMSE-4.1#PBF meets industry standards.
7.What is the process for return or replacement of LT3650EMSE-4.1#PBF?
All LT3650EMSE-4.1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650EMSE-4.1#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 LT3650EMSE-4.1#PBF part is unused and in its original packaging.
Return procedure for LT3650EMSE-4.1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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