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Analog Devices Inc. LT3650EDD-8.4#PBF
- Part No.:
- LT3650EDD-8.4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3650EDD-8.4#PBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,016
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Product details
Overview
LT3650EDD-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 charge current up to 2A via external sense resistor, 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 LT3650EDD-8.4#PBF datasheet, LT3650EDD-8.4#PBF pinout, LT3650EDD-8.4#PBF application, or LT3650EDD-8.4#PBF equivalent, key selection considerations include its 8.4V float voltage accuracy (±0.5%), 1MHz fixed-frequency average current mode control, 0.05Ω sense resistor compatibility, thermal foldback behavior, and DFN-12 package thermal performance (θJC = 3°C/W).
Technical Context
The LT3650EDD-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 (0.175Ω typical) and high efficiency across 9V–32V inputs.
It integrates dual termination schemes: C/10 detection (7.5–12.5mV sense threshold) and user-programmable safety timer (3-hour default via 0.68µF capacitor). Preconditioning activates below 5.8V BAT, reducing charge current to 15% of programmed maximum, while auto-recharge triggers at 97.5% of 8.4V float voltage (i.e., 8.2V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 8.4V ±0.5% - precise regulation for 2-cell Li-ion full-charge state; enables stable battery voltage hold without overvoltage risk. |
| Max Charge Current | 2A - set by external 0.05Ω sense resistor; supports fast charging of high-capacity 2S packs in space-constrained systems. |
| Input Voltage Range | 9V to 32V - compatible with 12V/24V industrial and automotive supplies; 11.5V minimum start-up ensures reliable cold-start capability. |
| Termination Accuracy | C/10 detection ±2.5% - ensures accurate end-of-charge detection; prevents premature cutoff or overcharging during CV phase. |
| Operating Frequency | 1MHz ±10% - enables use of small 10µH inductors and compact 1µF BOOST capacitor; reduces EMI filtering burden. |
| NTC Monitoring Range | 0.29V–1.36V (≈0°C–40°C) - provides safe-temperature window for Li-ion charging; suspends charge outside range and pulls FAULT low. |
| Standby Current | 85µA - minimizes system power draw when battery is fully charged; extends host device runtime in always-connected applications. |
Pinout & Package
LT3650EDD-8.4#PBF is housed in a 3mm × 3mm, 0.75mm-profile 12-pin Plastic DFN package with exposed thermal pad (Pin 13 = GND). The package supports high-power dissipation (θJC = 3°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 capacitance. |
| 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 charge; high-impedance at termination; sinks ≤10mA; signals CC/CV phase and fault conditions. |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC fault, bad-battery condition, or timer timeout; remains high-impedance otherwise; shares pull-up with CHRG. |
| TIMER (6) | Charge cycle timer programming | Connect 0.68µF to GND for 3-hour full-cycle timeout; grounded to disable timer and enable C/10-only termination. |
| RNG/SS (7) | Charge current programming & soft-start | Sources 50µA; sets max ICHG via VRNG/SS (0–1V range); supports RC soft-start or active current servoing. |
| NTC (8) | Temperature monitor input | Sources 50µA for 10kΩ B=3380 thermistor; disables charge if voltage <0.29V or >1.36V; includes 5°C hysteresis. |
| BAT (9) | Battery voltage feedback | Direct connection to battery+; senses float voltage (8.4V); auto-recharge triggers at 8.2V; bias current <0.1µA post-termination. |
| 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) | Switch gate drive bootstrap rail | 0–8.5V relative to SW; requires ≥1µF capacitor to SW; refreshed via external diode from BAT or auxiliary source. |
| SW (12) | Switch node output | Drives external inductor; connects to emitter of internal NPN switch; VSW(ON) ≤350mV at 2A; must be routed with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable float voltage | 8.4V ±0.5% - eliminates need for external voltage dividers or trimming; ensures cell-level compliance with Li-ion chemistry limits. |
| Auto-preconditioning | Activates below 5.8V BAT and reduces charge current to 15% IMAX - safely recovers deeply discharged 2S batteries without thermal runaway risk. |
| Dual termination modes | Configurable C/10 detection or 3-hour timer - provides flexibility for battery aging compensation (timer) or precision capacity-based cutoff (C/10). |
| Integrated system current limiting | CLP pin servos charge current to maintain total input current - enables shared power rail operation in multi-load systems like handheld test equipment. |
| Binary-coded status outputs | CHRG and FAULT pins provide unambiguous open-collector signaling - simplifies host MCU GPIO monitoring without ADC or complex logic. |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Cradle Chargers |
|---|---|
|
Use Scenario: Portable multimeters, thermal imagers, and gas detectors powered by removable 2S Li-ion packs. IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, preconditioning, and temperature-safe charging under variable ambient conditions. Use Value: Enables rapid field recharging from vehicle 12V/24V sockets; NTC monitoring prevents charging in extreme temperatures; 85µA standby preserves battery life during storage. |
Use Scenario: In-vehicle docking stations for tablets or ruggedized PDAs used in fleet management or logistics. IC Role / Device Role / Timing Role: High-input-voltage charger with auto-restart and bad-battery detection to handle intermittent ignition power and battery swaps. Use Value: 11.5V startup ensures operation even with weak vehicle batteries; CLP-based current limiting prevents fuse blowing during simultaneous accessory loads. |
| Desktop Cradle Chargers | Notebook Computers (Auxiliary Charging) |
|
Use Scenario: Office desk docks for enterprise tablets or barcode scanners requiring overnight top-off without supervision. IC Role / Device Role / Timing Role: Standalone charger IC providing timer-based 3-hour full-cycle termination and auto-recharge at 97.5% float voltage. Use Value: Eliminates need for host CPU involvement; 0.5% float accuracy maintains long-term cell health; DFN-12 footprint saves board area vs discrete solutions. |
Use Scenario: Secondary charging path in thin-and-light notebooks where main adapter cannot supply full battery replenishment. IC Role / Device Role / Timing Role: Supplemental 2A buck charger operating from USB-C PD or auxiliary DC input, independent of main PMIC. Use Value: 1MHz switching allows ultra-compact magnetics; BOOST/SW architecture achieves >90% efficiency at 20V input; RNG/SS pin enables dynamic current scaling based on system thermal headroom. |
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 |
|---|---|---|---|
| MP2617AGQ-Z | 8.4V float, 2A max, but uses peak current mode control and lacks CLP system current limiting; no integrated timer; requires external NTC bias. | Best suited for cost-sensitive, non-automotive applications where system-level current management is handled externally. | Select MP2617AGQ-Z only if CLP functionality is unnecessary and external timer circuitry can be added. |
| BQ24610RGER | 8.4V float, 3A max, but operates from 4.5V–28V input (lower high-end range); uses voltage-mode control; no NTC monitoring; requires external MOSFET. | Preferred for higher-current 2S applications with lower input voltage ceilings and no thermal monitoring requirement. | Choose BQ24610RGER when >2A charge current is needed and NTC safety is managed at system level. |
Compared with MP2617AGQ-Z and BQ24610RGER, the LT3650EDD-8.4#PBF uniquely integrates system current limiting (CLP), factory-trimmed 3-hour timer, and robust NTC monitoring in a single DFN package-reducing BOM count and layout complexity for industrial-grade 2S charging.
Availability
LT3650EDD-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 traceability.
Supply support for LT3650EDD-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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3650EDD-8.4#PBF belongs to Linear's high-voltage monolithic battery charger product line, designed specifically for robust, low-component-count charging of 2-cell Li-ion batteries from wide-range DC supplies in harsh environments.
FAQ
What is the exact float voltage of the LT3650EDD-8.4#PBF and how tightly is it specified?
The LT3650EDD-8.4#PBF delivers a nominal 8.4V battery float voltage with ±0.5% accuracy over temperature and line conditions. This specification is guaranteed across –40°C to 85°C and ensures compliance with standard 2-cell Li-ion chemistry requirements without external calibration. The LT3650EDD-8.4#PBF achieves this via an internal trimmed reference and low-drift error amplifier, eliminating need for external resistive dividers.
Can the LT3650EDD-8.4#PBF operate from a 9V input, and what is the minimum required for startup?
Yes, the LT3650EDD-8.4#PBF supports operation down to 9V input, but requires ≥11.5V to initiate startup unless the BOOST–SW voltage exceeds 2V. This dual-condition startup ensures reliable turn-on across varying input sources. Below 11.5V, the LT3650EDD-8.4#PBF remains in UVLO until either VIN rises or BOOST–SW is established - a critical design consideration for 12V automotive systems with cranking dips.
How does the LT3650EDD-8.4#PBF implement preconditioning, and at what battery voltage does it activate?
The LT3650EDD-8.4#PBF activates preconditioning automatically when the BAT pin voltage falls below 5.8V - the factory-set threshold for 2-cell Li-ion recovery. During preconditioning, charge current is reduced to 15% of the programmed maximum (e.g., 300mA for a 2A setup) to safely lift deeply discharged cells. The LT3650EDD-8.4#PBF exits preconditioning once BAT exceeds 5.8V + 90mV hysteresis, then resumes full-current charging.
What are the two termination methods supported by the LT3650EDD-8.4#PBF, and how are they configured?
The LT3650EDD-8.4#PBF supports both C/10 current-based termination and programmable timer-based termination. C/10 mode is enabled by grounding the TIMER pin; termination occurs when sensed current drops to 10% of programmed IMAX (e.g., 200mA for 2A). Timer mode is activated by connecting a capacitor (e.g., 0.68µF) from TIMER to GND, setting a 3-hour full-cycle timeout. The LT3650EDD-8.4#PBF combines both: it detects C/10 but continues topping until timer expiry.
Does the LT3650EDD-8.4#PBF include temperature monitoring, and what components are required?
Yes, the LT3650EDD-8.4#PBF includes integrated NTC thermistor monitoring via the NTC pin, which sources 50µA and expects a 10kΩ, B=3380 thermistor connected to GND. Charging halts if the NTC voltage falls below 0.29V (~40°C) or rises above 1.36V (~0°C), with ~5°C hysteresis. No external biasing components are needed - the LT3650EDD-8.4#PBF handles all sensing and decision logic internally.
LT3650EDD-8.4#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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-DFN (3x3)
LT3650EDD-8.4#PBF FAQ
1.How can I place an order for LT3650EDD-8.4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650EDD-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 LT3650EDD-8.4#PBF reliable?
The price and inventory of LT3650EDD-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 LT3650EDD-8.4#PBF is usually 5 days.
3.What payment methods are accepted for LT3650EDD-8.4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650EDD-8.4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650EDD-8.4#PBF?
LT3650EDD-8.4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650EDD-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 LT3650EDD-8.4#PBF?
For technical support, including LT3650EDD-8.4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650EDD-8.4#PBF requirements.
6.How does Aetrix verify that LT3650EDD-8.4#PBF is sourced from the original manufacturer or authorized distributors?
All LT3650EDD-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 LT3650EDD-8.4#PBF meets industry standards.
7.What is the process for return or replacement of LT3650EDD-8.4#PBF?
All LT3650EDD-8.4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650EDD-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 LT3650EDD-8.4#PBF part is unused and in its original packaging.
Return procedure for LT3650EDD-8.4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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