LT3651-8.X
RECOMMENDED FOR NEW DESIGNSMonolithic 4A High Voltage 2-Cell Li-Ion Battery Charger
- Part Models
- 8
- 1ku List Price
- Starting From $6.24
Overview
- Wide Input Voltage Range: 9V to 32V (40V Absolute Maximum)
- Programmable Charge Current Up to 4A
- Selectable C/10 or Onboard Timer Termination
- Dynamic Charge Rate Programming/Soft-Start
- Programmable Input Current Limit
- ±0.5% Float Voltage Accuracy
- ±7.5% Charge Current Accuracy
- ±4% C/10 Detection Accuracy
- NTC Resistor Temperature Monitor
- Auto-Recharge at 97.5% Float Voltage
- Auto-Precondition at <70% Float Voltage
- Bad Battery Detection with Auto-Reset
- Average Current Mode, Synchronous Switcher
- User Programmable Frequency
- Low Profile (0.75mm) 5mm × 6mm 36-Lead QFN Package
The LT3651-8.2/LT3651-8.4 are 2-cell, 4A Li-Ion/Polymer battery chargers that operate over a 9V to 32V input voltage range. An efficient monolithic average current mode synchronous switching regulator provides constant current, constant voltage charging with programmable maximum charge current. A charging cycle starts with battery insertion or when the battery voltage drops 2.5% below the float voltage. Charger termination is selectable as either charge current or internal safety timer timeout. Charge current termination occurs when the charge current falls to one-tenth the programmed maximum current (C/10). Timer based termination is typically set to three hours and is user programmable (charging continues below C/10 until timeout). Once charging is terminated, the LT3651-8.2/LT3651-8.4 supply current drops to 85μA into a standby mode.
The LT3651-8.2/LT3651-8.4 offer several safety features. A discharged battery is preconditioned with a small trickle charge and generates a signal if unresponsive. A thermistor monitors battery temperature, halting charging if out of range. Excessive die temperature reduces charge current. Charge current is also reduced to maintain constant input current to prevent excessive input loading. The LT3651-8.2/LT3651-8.4 are available in a 5mm × 6mm 36-lead QFN package.
| Float Voltage | |
| LT3651-4.1 | 4.1V |
| LT3651-4.2 | 4.2V |
| LT3651-8.2 | 8.2V |
| LT3651-8.4 | 8.4V |
Applications
- Industrial Handheld Instruments
- 12V to 24V Automotive and Heavy Equipment
- Desktop Cradle Chargers
- Notebook Computers
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Technical Articles 1
Product Selector Card 1
Brochure 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3651EUHE-8.2#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3651EUHE-8.2#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3651EUHE-8.4#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3651EUHE-8.4#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3651IUHE-8.2#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3651IUHE-8.2#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3651IUHE-8.4#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3651IUHE-8.4#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Battery Monitors & Fuel Gauges 1 | ||
| LTC2943 | NOT RECOMMENDED FOR NEW DESIGNS | Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement |
| Hot Swap Controllers 1 | ||
| LTC4364 | RECOMMENDED FOR NEW DESIGNS | Surge Stopper with Ideal Diode |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4417 | RECOMMENDED FOR NEW DESIGNS | Prioritized PowerPath™ Controller |
Tools & Simulations
LTspice 3
- LT3651-8.4 Demo Circuit - 2-Cell Li-Ion Charger with Input Current Limit & Charge Timeout (9-32V to 8.4V @ 4A)
- LT3651- 8.4 Demo Circuit - 4A, 2-Cell Charger with Maximum Power Point Control (16-32V to 8.4V @ 4A)
- LT3651-8.2 - Battery Charger IC
Models for the following parts are available in LTspice:
- LT3651-4.1
- LT3651-4.2
- LT3651-8.2
- LT3651-8.4
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
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