LT3651-4.X

RECOMMENDED FOR NEW DESIGNS

Monolithic 4A High Voltage 1 Cell Li-Ion Battery Charger

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Overview

  • Wide Input Voltage Range: Up to 32V (40V Absolute Maximum)
  • Programmable Charge Current Up to 4A
  • Selectable C/10 or On-board 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 <70% Float Voltage
  • Bad Battery Detection with Auto-Reset
  • Average Current Mode, Synchronous Switcher
  • User Programmable Frequency
  • Low Profile (0.75mm) 5mm × 6mm 36-Pin QFN Package

The LT3651 is a 1 cell 4A Li-Ion/Polymer battery charger that operates with input voltages up to 32V. 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 supply current drops to 85μA into a standby mode.

The LT3651 offers 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 is available in a 5mm × 6mm 36-pin 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
LT3651-4.X
Monolithic 4A High Voltage 1 Cell Li-Ion Battery Charger
6.5V to 32V Single Cell 4A Charger Efficiency, Power Loss vs DCIN Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Battery Charger ICs 1
LTM8061
RECOMMENDED FOR NEW DESIGNS 32V, 2A μModule (Power Module) Li-Ion/Polymer Battery Charger
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Protection Switches & Controllers 2
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
LTC2955
RECOMMENDED FOR NEW DESIGNS Pushbutton On/Off Controller with Automatic Turn-On
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3651-4.1
  • LT3651-4.2
  • LT3651-8.2
  • LT3651-8.4
LTspice

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

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC1362A-A

LT3651EUHE-4.2 Demo Board | 6.5V ≤ VIN ≤ 32V, 4A Li-Ion Battery Charger, VOUT = 4.2V @ 4A

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Product Details

Demonstration circuit 1362A-A (4.2V fixed output) is a 4A high voltage Li-Ion battery charger featuring the LT3651EUHE-4.2. The LT3651 is a complete, high power Li-Ion battery charger that can operate over a wide input voltage range. The charger is a constant-current, constant-voltage type with a maximum charge current of 4A that can be externally set. A precondition feature trickle charges a low voltage battery and bad battery detection provides a signal if the battery doesn’t respond to preconditioning. The LT3651EUHE is available in a 36-lead (5mm × 6mm) QFN surface mount package with two exposed thermal pads.

eval board
schematic 7
DC1362A-B

LT3651EUHE-4.1 Demo Board | 6.5V ≤ VIN ≤ 32V, 4A Li-Ion Battery Charger, VOUT =  4.1V @  4A

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Product Details

Demonstration circuit 1362A-B (fixed 4.1V output) is a 4A high voltage Li-Ion battery charger featuring the LT3651EUHE-4.1. The LT3651 is a complete, high power Li-Ion battery charger that can operate over a wide input voltage range. The charger is a constant-current, constant-voltage type with a maximum charge current of 4A that can be externally set. A precondition feature trickle charges a low voltage battery and bad battery detection provides a signal if the battery doesn’t respond to preconditioning. The LT3651EUHE is available in a 36-lead (5mm × 6mm) QFN surface mount package with two exposed thermal pads.
DC1362A-A
LT3651EUHE-4.2 Demo Board | 6.5V ≤ VIN ≤ 32V, 4A Li-Ion Battery Charger, VOUT = 4.2V @ 4A
DC1362A-A Demo Board DC1362A-A Demo Board DC1362A-A Demo Board DC1362A-A Demo Board DC1362A-A Demo Board DC1362A-A - Schematic
DC1362A-B
LT3651EUHE-4.1 Demo Board | 6.5V ≤ VIN ≤ 32V, 4A Li-Ion Battery Charger, VOUT =  4.1V @  4A
DC1362A-A - Schematic

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