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Analog Devices Inc. LT3650EMSE-8.4#TRPBF
- Part No.:
- LT3650EMSE-8.4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3650EMSE-8.4#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,177
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Product details
Overview
LT3650EMSE-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 implements constant-current/constant-voltage charging, C/10 or timer-based termination (3-hour default), and NTC-based temperature monitoring. It is used in 12V–24V industrial handheld instruments and automotive cradle chargers.
For engineers reviewing the LT3650EMSE-8.4#TRPBF datasheet, LT3650EMSE-8.4#TRPBF pinout, LT3650EMSE-8.4#TRPBF application, or LT3650EMSE-8.4#TRPBF equivalent, key selection considerations include its 8.4V float voltage accuracy (±0.5%), programmable 2A max charge current via external sense resistor, 1MHz average current mode control, preconditioning for deeply discharged batteries, and binary-coded open-collector status outputs (CHRG/FAULT).
Technical Context
The LT3650EMSE-8.4#TRPBF uses a fixed-frequency (1MHz) average current mode step-down architecture with bootstrapped gate drive for its internal 2.5A switch. Its control loop directly regulates average inductor current via SENSE–BAT differential voltage, with ITH error voltage clamped at 1V to enforce 100mV sense threshold and 2A maximum current (RSENSE = 50mΩ).
It integrates dual termination schemes: C/10 detection (7.5–12.5mV sense threshold) and user-programmable timer (CTIMER = 0.68µF → 3h full cycle). Preconditioning activates below 5.8V BAT, reducing charge current to 15% of programmed IMAX; auto-recharge triggers at 97.5% of 8.4V float (i.e., 8.2V), and bad-battery detection halts charging if precondition persists beyond 22.5 minutes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 32V (11.5V min start-up); supports direct connection to 12V/24V automotive or industrial rails without pre-regulation. |
| Float Voltage | 8.4V ±0.5% (typical 8.4V, min 8.32V, max 8.48V); precisely regulated for 2-cell Li-ion chemistry compliance. |
| Max Charge Current | Up to 2A, set by external RSENSE (e.g., 50mΩ yields 2A); accuracy ±5% over temperature and line. |
| Termination Method | Selectable C/10 (ICHG ≤ 200mA @ 2A setting) or internal timer (3h default, programmable via CTIMER); enables top-off or safety-limited cycles. |
| NTC Monitoring | Supports 10kΩ B=3380 thermistor; disables charging if NTC voltage <0.29V (>40°C) or >1.36V (<0°C); includes 5°C hysteresis. |
| Standby Current | 85µA after charge termination; minimizes parasitic drain when connected to battery in standby. |
| Switch On-Resistance | 0.175Ω typical; ensures low conduction loss during high-current CC phase at 2A. |
Pinout & Package
LT3650EMSE-8.4#TRPBF is housed in a 12-lead plastic MSOP package (3mm × 4.9mm, 0.65mm pitch), with exposed thermal pad (Pin 13) soldered to PCB ground for thermal management (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 9–32V; powers internal circuitry and switch; requires ≥10µF low-ESR bulk 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 rising threshold with 120mV hysteresis; pulls VIN bias to 15µA in shutdown. |
| CHRG (4) | Open-collector status output | Pulled low during active charging; high-impedance when terminated; 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 CTIMER to GND for C/10-only termination; 0.68µF sets 3h full cycle and 22.5min precondition timeout. |
| RNG/SS (7) | Charge current programming & soft-start | Sources 50µA; VRNG/SS × 0.1 = VSENSE–VBAT; enables dynamic current scaling or RC soft-start (e.g., 1V = full IMAX). |
| NTC (8) | Battery temperature sense input | Bias current 50µA; monitors 10kΩ thermistor; disables charging outside 0°C–40°C safe range. |
| BAT (9) | Battery voltage feedback | Regulates float voltage at 8.4V; auto-recharge triggers at 8.2V (97.5% of float); requires ≥10µF decoupling. |
| SENSE (10) | Current sense input | High-side sensing node; VSENSE–VBAT = 100mV at 2A; bias current <0.1µA post-termination. |
| BOOST (11) | Bootstrap supply for switch driver | 0–8.5V relative to SW; requires ≥1µF capacitor to SW; enables low RDS(on) switch saturation. |
| SW (12) | Switch output | Drives external inductor; internal switch rated 2.5A; VSW(ON) = 350mV at 2A. |
| 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 2A charge current | Set via external RSENSE (e.g., 50mΩ); ±5% accuracy enables precise capacity-matched charging across production units. |
| User-selectable C/10 or timer termination | Eliminates need for external microcontroller; timer option provides guaranteed full-cycle duration (e.g., 3h) for battery conditioning. |
| Auto-precondition for low-VBAT batteries | Activates below 5.8V; reduces charge current to 15% IMAX to safely recover deeply discharged cells without thermal stress. |
| NTC-based temperature monitoring | Hardware-level protection using standard 10kΩ B=3380 thermistor; no firmware required for thermal cutoff. |
| Binary-coded status outputs (CHRG/FAULT) | Provides unambiguous real-time state reporting (charging/standby/fault) to host MCU or LED driver without ADC or logic decoding. |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Cradle Chargers |
|---|---|
Use Scenario: Portable test equipment powered by 2-cell Li-ion packs, recharged via vehicle 12V socket or bench supply. IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, preconditioning, and thermal safety without host processor intervention. Use Value: Enables robust field operation with automatic recovery from deep discharge and protection against overheating during extended charging sessions. |
Use Scenario: In-vehicle docking station for tablets or ruggedized mobile devices, drawing power from automotive battery (12V nominal, up to 16V running). IC Role / Device Role / Timing Role: High-input-voltage charger IC regulating 8.4V float for 2S Li-ion, with UVLO integration via SHDN pin and wide VIN tolerance. Use Value: Eliminates need for external buck converter; supports direct 12V/24V input while maintaining ±0.5% float accuracy critical for cell longevity. |
| Desktop Battery Cradles | Notebook Computer Docking Stations |
Use Scenario: Multi-bay desktop cradle recharging spare 2-cell Li-ion packs for field service teams. IC Role / Device Role / Timing Role: Standalone charger IC providing autonomous C/10 or timer-based termination, status signaling, and bad-battery detection. Use Value: Reduces BOM count by integrating switch, control, and protection; binary status pins simplify interface to indicator LEDs or basic controllers. |
Use Scenario: Docking station supplying power and charging auxiliary batteries (e.g., stylus, keyboard) alongside main laptop battery. IC Role / Device Role / Timing Role: Secondary charger managing dedicated 2S pack with independent float regulation and thermal monitoring. Use Value: Provides isolated, precision 8.4V charging without interfering with host system power management; NTC input ensures safe operation near heat-generating components. |
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 input voltage rating (up to 40V), integrated power path management, and USB-compatible input current limiting; same 8.4V float and MSOP-12 package. | Preferred for systems requiring input current limiting or seamless transition between adapter and battery power. | Select LT3652EMSE-8.4#TRPBF when input current control or power-path functionality is required; not drop-in due to different CLP/PROG pin behavior. |
| BQ24610RGER | TI part with 8.4V float, 3A max current, and adjustable termination; lacks integrated NTC monitoring and uses external MOSFETs instead of monolithic switch. | Suitable for higher-current designs where discrete FETs allow thermal optimization, but requires additional layout area and gate drive design. | Choose BQ24610RGER only when >2A current or discrete switch flexibility is mandatory; adds complexity versus LT3650EMSE-8.4#TRPBF's monolithic simplicity. |
Compared with LT3652EMSE-8.4#TRPBF and BQ24610RGER, the LT3650EMSE-8.4#TRPBF offers the most compact, self-contained solution for mid-power 2-cell charging-requiring only RSENSE, CTIMER, and NTC-with no external FETs or power-path logic, making it ideal for space-constrained industrial and automotive accessories.
Availability
LT3650EMSE-8.4#TRPBF is available at Aetrix Electronics and suitable for industrial handheld instruments, 12V–24V automotive cradle chargers, and desktop battery cradles requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3650EMSE-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 precision instrumentation, industrial, and automotive markets.
The LT3650 product line delivers monolithic, high-input-voltage Li-ion chargers optimized for rugged 12V/24V systems-designed to eliminate external switches, reduce bill-of-materials, and provide autonomous battery management with hardware-enforced safety.
FAQ
What is the exact float voltage of the LT3650EMSE-8.4#TRPBF and how tightly is it regulated?
The LT3650EMSE-8.4#TRPBF is factory trimmed to deliver a nominal 8.4V float voltage, with guaranteed accuracy of ±0.5% (8.32V to 8.48V) over –40°C to 85°C. This specification is verified per Electrical Characteristics table on page 3 of the official datasheet, ensuring reliable 2-cell Li-ion charging without external calibration or trimming components. The LT3650EMSE-8.4#TRPBF achieves this stability through an internal bandgap reference and precision error amplifier architecture.
Can the LT3650EMSE-8.4#TRPBF be used without the NTC thermistor, and what happens to temperature protection?
Yes, the LT3650EMSE-8.4#TRPBF operates without the NTC thermistor: leave the NTC pin unconnected, and temperature monitoring is automatically disabled. Charging proceeds normally, but thermal fault protection is inactive. The IC will not suspend charging or assert FAULT due to overtemperature. If thermal safety is required, a 10kΩ B=3380 NTC must be connected from NTC pin to GND; the LT3650EMSE-8.4#TRPBF sources 50µA and monitors voltage thresholds (0.29V–1.36V) to enforce 0°C–40°C limits.
How is the maximum charge current set on the LT3650EMSE-8.4#TRPBF, and what is the minimum sense resistor value?
The LT3650EMSE-8.4#TRPBF sets maximum charge current via the SENSE–BAT differential voltage, with 100mV corresponding to full-scale current (e.g., 2A with RSENSE = 50mΩ). The minimum recommended RSENSE is 25mΩ (4A equivalent), but the IC's switch current limit is 2.5A, so practical maximum is 2A. Accuracy is ±5%, and the sense resistor must handle peak power (I²×R); for 2A, 50mΩ dissipates 200mW. The LT3650EMSE-8.4#TRPBF also allows dynamic adjustment via the RNG/SS pin.
Does the LT3650EMSE-8.4#TRPBF support automatic recharge, and at what battery voltage does it trigger?
Yes, the LT3650EMSE-8.4#TRPBF supports automatic recharge: it restarts charging when the BAT pin voltage drops 2.5% below the float voltage (i.e., 8.2V for the 8.4V variant). This threshold is fixed and non-adjustable. After termination, the IC enters 85µA standby mode; when BAT falls to 8.2V, the voltage error amplifier detects under-voltage and resumes the full CC/CV cycle. The LT3650EMSE-8.4#TRPBF performs this autonomously-no external circuitry or host intervention is needed.
What package type and thermal characteristics apply to the LT3650EMSE-8.4#TRPBF?
The LT3650EMSE-8.4#TRPBF uses a 12-lead plastic MSOP package (3mm × 4.9mm, 0.65mm pitch) with exposed thermal pad (Pin 13). Its thermal resistance is θJA = 43°C/W and θJC = 3°C/W when the exposed pad is soldered to a 1-in² copper area. This enables reliable operation at full 2A charge current in ambient temperatures up to 85°C, provided adequate PCB copper pour and airflow. The LT3650EMSE-8.4#TRPBF datasheet specifies TJMAX = 125°C and requires the exposed pad to be grounded for both thermal and electrical performance.
LT3650EMSE-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
LT3650EMSE-8.4#TRPBF FAQ
1.How can I place an order for LT3650EMSE-8.4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650EMSE-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 LT3650EMSE-8.4#TRPBF reliable?
The price and inventory of LT3650EMSE-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 LT3650EMSE-8.4#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3650EMSE-8.4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650EMSE-8.4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650EMSE-8.4#TRPBF?
LT3650EMSE-8.4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650EMSE-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 LT3650EMSE-8.4#TRPBF?
For technical support, including LT3650EMSE-8.4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650EMSE-8.4#TRPBF requirements.
6.How does Aetrix verify that LT3650EMSE-8.4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3650EMSE-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 LT3650EMSE-8.4#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3650EMSE-8.4#TRPBF?
All LT3650EMSE-8.4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650EMSE-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 LT3650EMSE-8.4#TRPBF part is unused and in its original packaging.
Return procedure for LT3650EMSE-8.4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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