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Analog Devices Inc. LT3650EMSE-4.1#TRPBF
- Part No.:
- LT3650EMSE-4.1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3650EMSE-4.1#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,065
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Product details
Overview
LT3650EMSE-4.1#TRPBF 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 3-hour timer termination, preconditioning for deeply discharged batteries, and NTC-based temperature monitoring. It is used in 12V–24V automotive cradle chargers and industrial handheld instruments requiring robust high-input-voltage battery management.
For engineers reviewing the LT3650EMSE-4.1#TRPBF datasheet, LT3650EMSE-4.1#TRPBF pinout, LT3650EMSE-4.1#TRPBF application, or LT3650EMSE-4.1#TRPBF equivalent, key selection considerations include its 4.1V fixed float voltage, MSOP-12 package with exposed thermal pad, 0.5% float voltage accuracy, C/10 detection accuracy of ±2.5%, and compatibility with external current-sense resistor programming up to 2A.
Technical Context
The LT3650EMSE-4.1#TRPBF employs average current mode control at 1MHz fixed frequency, using internal error amplifiers to servo directly to average inductor current via the SENSE–BAT differential voltage. Its 2A integrated switch is driven by a bootstrapped BOOST rail referenced to SW, enabling low on-resistance (0.175Ω) and high efficiency across wide VIN–VBAT differentials.
It implements dual termination schemes: C/10 detection (ITH = 0.1V) or programmable timer (CTIMER = 0.68µF → 3h), with bad-battery detection triggered if preconditioning fails within 22.5 minutes. Auto-recharge initiates when BAT voltage drops 2.5% below 4.1V float, and standby current drops to 85µA post-termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 32V - supports direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Float Voltage | 4.10V ±0.02V (0.5% accuracy) - precisely regulates single-cell Li-Ion to 4.1V for extended cycle life in high-reliability applications. |
| Max Charge Current | Up to 2A - set externally via RSENSE = 0.1V / IMAX; enables fast charging of 2000–4000mAh batteries. |
| C/10 Detection Accuracy | ±2.5% - ensures reliable charge termination at ICHG = IMAX/10, minimizing overcharge risk. |
| Standby Supply Current | 85µA - reduces system quiescent load during battery maintenance, critical for always-connected devices. |
| NTC Monitoring Range | 0.29V–1.36V (≈0°C–40°C) - suspends charging outside safe thermal window, with ~5°C hysteresis per threshold. |
| Operating Frequency | 0.9–1.1MHz - enables compact magnetics and low-profile 3mm×3mm DFN or MSOP-12 packaging. |
Pinout & Package
LT3650EMSE-4.1#TRPBF is housed in a 12-lead plastic MSOP package (3mm × 4.9mm, 0.65mm pitch) with exposed thermal pad (Pin 13 = SGND) that must be soldered to PCB ground for thermal and electrical integrity.
| 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 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 bias to 15µA in shutdown; allows UVLO integration via resistor divider. |
| CHRG (4) | Open-collector status output | Pulled low during active charging; high-impedance after termination; sinks ≤10mA; indicates C/10 or timer completion. |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC fault, bad-battery condition, or timer timeout; high-impedance otherwise; shares pull-up with CHRG. |
| TIMER (6) | Charge cycle timer programming | Connect CTIMER to GND for C/10-only termination; 0.68µF sets 3h full-cycle timeout and 22.5min precondition limit. |
| RNG/SS (7) | Charge current programming & soft-start | Sources 50µA; VRNG/SS × 0.1 = VSENSE–VBAT; enables dynamic current scaling and controlled ramp-up to avoid inrush. |
| NTC (8) | Battery temperature sensing input | Sources 50µA into 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 anode; senses float voltage (4.1V); triggers auto-recharge at 97.5% of VFLT (4.0V). |
| SENSE (10) | Current sense input | High-side connection to RSENSE; 100mV across RSENSE = 2A max; bias current <0.1µA post-termination. |
| BOOST (11) | Switch gate drive bootstrap supply | Connected via ≥1µF capacitor to SW; supplies boosted voltage to switch driver; range: 0V to 4.5V relative to SW. |
| SW (12) | Internal switch emitter output | Drives external inductor; switch on-resistance = 0.175Ω; voltage swing limited to VIN–350mV under 2A load. |
| SGND (13) | Signal and thermal ground | Exposed pad; must be soldered to PCB ground plane for thermal dissipation (θJC = 3°C/W) and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No blocking diode required | Integrated reverse-voltage protection eliminates external diode, reducing BOM count and forward drop loss in 12V/24V systems. |
| User-selectable termination | Configurable via TIMER pin: either precise C/10 detection or time-limited top-off (3h typical) - supports both safety-critical and capacity-optimized use cases. |
| Precondition & bad-battery detection | Automatically trickle-charges batteries <2.9V at 15% IMAX; halts and signals fault if no voltage rise within 22.5min - prevents damage from shorted or degraded cells. |
| Auto-recharge at 97.5% VFLT | Resumes charging when BAT drops to 4.0V (for LT3650-4.1); maintains battery at optimal 4.1V float without user intervention or external circuitry. |
| Binary-coded status outputs | CHRG and FAULT pins provide unambiguous open-collector signals for MCU GPIO monitoring - no level-shifting needed for 3.3V/5V logic. |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Cradle Chargers |
|---|---|
|
Use Scenario: Portable test meters and data loggers powered by single-cell Li-Ion, operating in field environments with variable input sources (car battery, wall adapter, solar). IC Role / Device Role / Timing Role: Primary battery management IC providing CC/CV charging, thermal cutoff, and automatic recharge - replaces discrete charge controller + protection IC. Use Value: Enables 2A fast charging from 12V/24V inputs while maintaining <0.5% float accuracy and 85µA standby, extending runtime and shelf life. |
Use Scenario: Vehicle-mounted docking stations for tablets or ruggedized tablets used in fleet management or logistics. IC Role / Device Role / Timing Role: High-voltage battery charger IC with built-in UVLO (via SHDN), input current limiting (CLP), and fault signaling - manages battery health during frequent hot-plug events. Use Value: Eliminates need for external DC-DC pre-regulator; withstands automotive transients up to 40V; NTC monitoring prevents thermal runaway during continuous charging. |
| Desktop Cradle Chargers | Notebook Computers (Auxiliary Charging) |
|
Use Scenario: AC-powered desktop docks for handheld scanners or medical devices requiring overnight full-charge cycles. IC Role / Device Role / Timing Role: Monolithic charger with programmable 3h safety timer and C/10 termination - ensures complete, safe charge without software supervision. Use Value: Reduces bill-of-materials by integrating switch, current sense, timer, and status logic; MSOP-12 footprint simplifies layout versus discrete solutions. |
Use Scenario: Secondary charging path in notebooks where main PMIC handles primary battery, and LT3650EMSE-4.1#TRPBF charges auxiliary backup battery or supercapacitor bank. IC Role / Device Role / Timing Role: Standalone high-accuracy 4.1V charger with autonomous restart and low-quiescent operation - operates independently of host CPU power states. Use Value: Maintains backup power integrity with 85µA standby and auto-recharge at 4.0V, ensuring RTC and firmware recovery remain functional during main battery depletion. |
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 |
|---|---|---|---|
| LTC4000-1#PBF | Adjustable float voltage (programmable 3.5V–4.5V); no integrated switch; requires external MOSFETs; higher BOM complexity. | Used where flexible chemistry support (LiFePO₄, LiCoO₂) or higher current (>2A) is needed; not drop-in compatible. | Select LTC4000-1#PBF only when float voltage flexibility or >2A scaling justifies added design effort and component count. |
| BQ24610RGER | Fixed 4.2V float; 3.5A max charge current; integrated MOSFETs; 4.5V–28V input; no NTC monitoring or preconditioning. | Targets cost-sensitive 4.2V Li-Ion applications without thermal safety requirements; lacks auto-recharge and bad-battery detection. | Choose BQ24610RGER for high-current 4.2V charging where NTC and precondition features are unnecessary and input voltage is ≤28V. |
Compared with LTC4000-1#PBF and BQ24610RGER, the LT3650EMSE-4.1#TRPBF provides fixed 4.1V float with superior thermal safety (NTC + hysteresis), autonomous preconditioning, and lower standby current (85µA vs ≥200µA), making it optimal for reliability-critical 12V–24V industrial and automotive battery systems.
Availability
LT3650EMSE-4.1#TRPBF 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-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3650EMSE-4.1#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 healthcare markets.
The LT3650EMSE-4.1#TRPBF belongs to Linear's high-voltage monolithic battery charger product line, designed specifically for robust, low-component-count charging of single-cell Li-Ion batteries from wide-range industrial and automotive power sources.
FAQ
What is the exact float voltage of the LT3650EMSE-4.1#TRPBF?
The LT3650EMSE-4.1#TRPBF has a factory-trimmed fixed float voltage of 4.10V with ±0.02V (0.5%) accuracy over –40°C to 85°C. This value is specific to the "-4.1" variant and differs from the -4.2 version (4.20V). The precision enables reliable charging of Li-Ion cells optimized for 4.1V operation to extend cycle life and reduce stress.
Does the LT3650EMSE-4.1#TRPBF require an external blocking diode on the VIN line?
No, the LT3650EMSE-4.1#TRPBF does not require an external blocking diode on VIN. It integrates reverse-voltage protection, allowing direct connection to 12V or 24V supply rails even when the battery remains connected during input removal. This eliminates conduction loss and simplifies layout in automotive and industrial power systems.
How is charge current programmed on the LT3650EMSE-4.1#TRPBF?
Charge current is programmed using an external sense resistor (RSENSE) between SENSE and BAT pins: RSENSE = 0.1V / ICHG(MAX). For example, 50mΩ sets 2A maximum. The RNG/SS pin further enables dynamic scaling (0–100% IMAX) or soft-start via a resistor or capacitor, providing flexibility for inrush control and system load management.
What happens if the battery voltage is below 2.9V when the LT3650EMSE-4.1#TRPBF starts?
If BAT voltage is below 2.9V, the LT3650EMSE-4.1#TRPBF automatically enters precondition mode, delivering 15% of the programmed maximum current (e.g., 300mA for 2A setting) until BAT rises above 2.9V. If no response occurs within 22.5 minutes (1/8 of 3h timer), a bad-battery fault is asserted, pulling FAULT low and halting charging.
Can the LT3650EMSE-4.1#TRPBF be used with a 4.2V Li-Ion cell?
The LT3650EMSE-4.1#TRPBF is specified for 4.1V float and should not be used with standard 4.2V Li-Ion cells unless explicitly qualified for reduced-voltage operation. Using it on 4.2V cells results in undercharging (≈95% SOC), potentially impacting runtime. For 4.2V cells, select the LT3650EMSE-4.2#TRPBF variant instead.
LT3650EMSE-4.1#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:
- 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#TRPBF FAQ
1.How can I place an order for LT3650EMSE-4.1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650EMSE-4.1#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-4.1#TRPBF reliable?
The price and inventory of LT3650EMSE-4.1#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-4.1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3650EMSE-4.1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650EMSE-4.1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650EMSE-4.1#TRPBF?
LT3650EMSE-4.1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650EMSE-4.1#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-4.1#TRPBF?
For technical support, including LT3650EMSE-4.1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650EMSE-4.1#TRPBF requirements.
6.How does Aetrix verify that LT3650EMSE-4.1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3650EMSE-4.1#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-4.1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3650EMSE-4.1#TRPBF?
All LT3650EMSE-4.1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650EMSE-4.1#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-4.1#TRPBF part is unused and in its original packaging.
Return procedure for LT3650EMSE-4.1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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