IC manufacturers Analog Devices

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Analog Devices LT3651-8.4

Monolithic 4A High Voltage 2-Cell Li-Ion Battery Charger

Overview

TopologyBuck Converter
Input voltage12-32 V
Switching frequency250-1100 kHz
Output 14 A
IC revisionA

Description

The LT®3651-8.2/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.

Features

  • 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

Typical applications

  • Desktop Cradle Chargers
  • Notebook Computers
  • 12V to 24V Automotive and Heavy Equipment
  • Industrial Handheld Instruments

Products

Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IRP,40K
(A)
ISAT
(A)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
74477010SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files WE-PD SMT Power Inductor 10 8.2 7.5 20 18 1280 Standard
Order Code Data­sheet Simu­lation
74477010SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Samples
Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IRP,40K
(A)
ISAT
(A)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples