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Analog Devices Inc. LT3650EDD-4.1#PBF
- Part No.:
- LT3650EDD-4.1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3650EDD-4.1#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,255
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Product details
Overview
LT3650EDD-4.1#PBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down Li-Ion/Polymer battery charger IC with integrated 2.5A switch, 4.1V float voltage, and 4.75V–32V input range. 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 - used in 12V–24V industrial handhelds and automotive cradle chargers.
For engineers reviewing the LT3650EDD-4.1#PBF datasheet, LT3650EDD-4.1#PBF pinout, LT3650EDD-4.1#PBF application, or LT3650EDD-4.1#PBF equivalent, key selection criteria include its 4.1V float voltage accuracy (±0.5%), 5% charge current accuracy, 1MHz fixed-frequency average current mode control, CLP-based system current limiting, and DFN-12 thermal performance with exposed GND pad.
Technical Context
The LT3650EDD-4.1#PBF implements average current mode control using internal voltage and current error amplifiers, with ITH voltage directly proportional to sensed inductor current. Its 1MHz switching frequency enables compact magnetics, while bootstrapped BOOST drive ensures low 350mV SW-on drop at 2A.
Charge management integrates dual termination schemes: C/10 detection (7.5–12.5mV sense threshold) or user-programmable timer (3 hr typical via 0.68µF capacitor), with bad-battery detection triggered if preconditioning exceeds 22.5 minutes. Preconditioning activates below 2.9V BAT and reduces charge current to 15% of programmed IMAX.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.10 V ±0.5% - sets final battery charge level; critical for cell longevity and capacity retention in single-cell Li-Ion systems. |
| Max Charge Current | 2 A - set by external 50 mΩ sense resistor; supports fast charging of 2000–4000 mAh batteries. |
| Input Voltage Range | 4.75 V to 32 V - enables direct use with 12V/24V automotive, industrial, and PoE-derived supplies without pre-regulation. |
| Switch On-Drop | 350 mV at 2 A - minimizes conduction loss and thermal stress in DFN-12 package with θJC = 3°C/W. |
| C/10 Detection Accuracy | ±2.5% - ensures reliable end-of-charge detection across temperature; corresponds to 7.5–12.5 mV sense voltage window. |
| Standby Current | 85 µA - maintains ultra-low quiescent draw after charge termination, preserving battery during long-term standby. |
| NTC Monitoring Range | 0.29 V to 1.36 V - maps to ~0°C–40°C for 10 kΩ B=3380 thermistor; suspends charging outside safe thermal zone. |
Pinout & Package
LT3650EDD-4.1#PBF uses a 3 mm × 3 mm, 12-pin plastic DFN package with exposed thermal pad (Pin 13 = SGND). 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 4.75–32 V; powers internal circuitry and switch; requires ≥10 µF low-ESR input capacitance. |
| CLP (2) | System current limit monitor | Enables dynamic reduction of charge current to maintain total input current ≤ programmed limit (e.g., 50 mV drop = 1 A system load). |
| SHDN (3) | Enable/disable control | 1.20 V threshold with 120 mV hysteresis; pulls VIN bias to 15 µA in shutdown; supports UVLO integration. |
| CHRG (4) | Open-collector status output | Pulled low during active charging or temperature/bad-battery fault; high-impedance when terminated or in standby. |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC over/under-temperature, bad-battery detection, or timer timeout; remains high-Z otherwise. |
| TIMER (6) | End-of-cycle timer programming | Connects to ground for C/10-only termination; connects to capacitor (e.g., 0.68 µF) for 3-hour full-cycle timeout. |
| RNG/SS (7) | Charge current programming | Sources 50 µA; sets max IMAX via resistor (e.g., 20 kΩ → 1 V → 100 mV across RSENSE → 2 A); supports soft-start with capacitor. |
| NTC (8) | Battery temperature sense input | Bias current 50 µA; monitors 10 kΩ NTC; disables charging if voltage <0.29 V (>40°C) or >1.36 V (<0°C). |
| BAT (9) | Battery voltage feedback | Direct connection to battery anode; senses float voltage (4.10 V); triggers auto-recharge at 97.5% of VFLT (4.00 V). |
| SENSE (10) | Current sense input | Measures voltage across RSENSE (BAT–SENSE); 100 mV = 2 A; bias current <0.1 µA post-termination to minimize leakage. |
| BOOST (11) | Bootstrap gate drive supply | Connected to SW via ≥1 µF capacitor; enables low RDS(on) switch operation; referenced to SW, not GND. |
| SW (12) | Switch node output | Drives external inductor; 2.5 A current limit; 350 mV on-drop at 2 A; requires careful layout to minimize EMI and ringing. |
| SGND (13) | Signal and thermal ground | Exposed pad; must be soldered to solid PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No blocking diode required | Internal reverse-voltage protection eliminates external diode, reducing BOM count and forward drop losses. |
| Auto-precondition at low voltage | Activates below 2.9 V BAT with 90 mV hysteresis; limits current to 15% IMAX to safely recover deeply discharged cells. |
| Binary-coded status outputs | CHRG and FAULT pins provide unambiguous real-time state reporting (charging, terminated, fault type) without I²C or SPI overhead. |
| Programmable input current limit | CLP pin allows system-level current budgeting - e.g., reserves 1 A for host MCU while allocating remaining power to battery charging. |
| Thermal foldback protection | Reduces IMAX as junction temperature rises, preventing thermal runaway in sealed enclosures or high ambient conditions. |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Cradle Chargers |
|---|---|
Use Scenario: Ruggedized portable test equipment powered by removable Li-Ion packs, operating in field environments with variable input sources (car battery, wall adapter, USB-PD). IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, preconditioning, and thermal safety; interfaces directly with 12V/24V vehicle power without intermediate DC-DC. Use Value: Enables single-chip charging from wide-input rails, eliminating pre-regulator stages and reducing board area by >30% versus discrete solutions. | Use Scenario: In-vehicle docking station for tablets or communication devices, drawing from automotive battery (9–16 V) or auxiliary 24 V supply. IC Role / Device Role / Timing Role: High-efficiency step-down charger with CLP-based system current limiting to avoid fuse tripping during simultaneous host + battery load. Use Value: Maintains stable 4.1 V float voltage (±0.5%) across temperature, ensuring consistent cell aging and >500-cycle lifetime in automotive thermal profiles. |
| Desktop Cradle Chargers | Notebook Computers (Auxiliary Charging) |
Use Scenario: AC-powered desktop dock that charges both host device and attached peripherals via shared 19 V input rail. IC Role / Device Role / Timing Role: Standalone Li-Ion charger IC with auto-restart (2.5% VFLT drop) and NTC monitoring, decoupled from host CPU control. Use Value: Eliminates need for firmware-controlled charging algorithms; provides hardware-enforced safety independent of OS or BIOS reliability. | Use Scenario: Secondary charging path in thin-and-light notebooks where main PMIC handles primary battery, and LT3650EDD-4.1#PBF manages auxiliary battery (e.g., keyboard, stylus). IC Role / Device Role / Timing Role: Independent monolithic charger with 3 mm × 3 mm DFN footprint, minimizing impact on constrained motherboard layout. Use Value: Delivers 2 A peak charge current in <10 mm² area with 85 µA standby draw, extending auxiliary battery runtime without increasing system quiescent load. |
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 |
|---|---|---|---|
| LT3650EDD-4.2#PBF | 4.20 V float voltage (±0.5%) vs. 4.10 V; identical pinout, specs, and feature set. | Designed for standard 4.2 V Li-Ion cells; not suitable where 4.1 V float is mandated for extended cycle life or high-temp operation. | Select LT3650EDD-4.1#PBF when cell chemistry or OEM spec requires 4.1 V float; use -4.2 variant only if 4.2 V is explicitly validated. |
| MP2617GQ-Z | 4.2 V float; 2.5 A max current; 2.5 MHz switching; no CLP input or timer-based termination; QFN-16 package. | Lacks system current limiting and programmable safety timer; requires external microcontroller for C/10 monitoring and restart logic. | Choose MP2617GQ-Z only if higher frequency and smaller inductors are prioritized over autonomous safety features and analog system-level current control. |
Compared with LT3650EDD-4.2#PBF, the LT3650EDD-4.1#PBF provides tighter voltage margin for conservative Li-Ion aging; compared with MP2617GQ-Z, it delivers fully autonomous charging with hardware-enforced timer, preconditioning, and CLP-based load management - reducing firmware dependency and validation scope.
Availability
LT3650EDD-4.1#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 LT3650EDD-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, automotive, and communications markets.
The LT3650 product line was designed specifically for high-input-voltage, monolithic Li-Ion charging in space-constrained industrial and automotive applications - emphasizing autonomy, thermal robustness, and analog safety features over digital configurability.
FAQ
What is the exact float voltage specification for LT3650EDD-4.1#PBF?
The LT3650EDD-4.1#PBF has a nominal float voltage of 4.10 V with ±0.5% accuracy over temperature (–40°C to 85°C). This is confirmed in the Electrical Characteristics table under VBAT(FLT) for LT3650-4.1, with min/typ/max values of 4.08 V / 4.10 V / 4.12 V. The 4.1 V setting distinguishes it from the 4.2 V variant and is optimized for longer cycle life in high-stress environments.
Does LT3650EDD-4.1#PBF require an external blocking diode on the VIN line?
No, the LT3650EDD-4.1#PBF does not require an external blocking diode on VIN. It incorporates internal reverse-voltage protection that prevents battery discharge into the input supply when VIN is absent or lower than battery voltage. This eliminates diode forward drop and associated power loss, simplifying design and improving efficiency in battery-backup or dual-source systems.
How is charge current programmed on LT3650EDD-4.1#PBF?
Charge current is programmed using an external sense resistor (RSENSE) between SENSE and BAT pins, where IMAX = 0.1 V / RSENSE. For 2 A, RSENSE = 50 mΩ. Additionally, the RNG/SS pin sources 50 µA, allowing dynamic adjustment: VRNG/SS = 50 µA × RRNG/SS sets a scaling factor (e.g., 0.5 V → 50% IMAX). Soft-start is implemented with a capacitor from RNG/SS to GND.
Can LT3650EDD-4.1#PBF terminate charging using only the internal timer?
Yes, LT3650EDD-4.1#PBF can terminate exclusively via its internal timer by connecting a capacitor from TIMER to GND (e.g., 0.68 µF = 3 hours). When enabled, the timer overrides C/10 detection - charging continues below C/10 until timeout, enabling top-off. Bad-battery detection is also active, halting charge if preconditioning exceeds one-eighth of the timer period (e.g., 22.5 min for 3 hr).
What thermal management is required for LT3650EDD-4.1#PBF in 2A operation?
For continuous 2A operation, LT3650EDD-4.1#PBF requires soldering the exposed thermal pad (Pin 13, SGND) to a minimum 200 mm² copper pour on the PCB. With θJC = 3°C/W and θJA = 43°C/W, junction temperature rise is ~70°C above ambient at full load. Use ≥10 µF input capacitance and ensure BOOST–SW capacitor (≥1 µF) is placed adjacent to pins 11/12 to minimize loop inductance and switching losses.
LT3650EDD-4.1#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:
- 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-DFN (3x3)
LT3650EDD-4.1#PBF FAQ
1.How can I place an order for LT3650EDD-4.1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650EDD-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 LT3650EDD-4.1#PBF reliable?
The price and inventory of LT3650EDD-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 LT3650EDD-4.1#PBF is usually 5 days.
3.What payment methods are accepted for LT3650EDD-4.1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650EDD-4.1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650EDD-4.1#PBF?
LT3650EDD-4.1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650EDD-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 LT3650EDD-4.1#PBF?
For technical support, including LT3650EDD-4.1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650EDD-4.1#PBF requirements.
6.How does Aetrix verify that LT3650EDD-4.1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3650EDD-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 LT3650EDD-4.1#PBF meets industry standards.
7.What is the process for return or replacement of LT3650EDD-4.1#PBF?
All LT3650EDD-4.1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650EDD-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 LT3650EDD-4.1#PBF part is unused and in its original packaging.
Return procedure for LT3650EDD-4.1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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