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LT3651EUHE-8.2#TRPBF

Description
IC CHRG MGMT LI-ION/LI-POL 36QFN
Categorysemiconductor    Power management   
File Size340KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LT3651EUHE-8.2#TRPBF Overview

IC CHRG MGMT LI-ION/LI-POL 36QFN

LT3651EUHE-8.2#TRPBF Parametric

Parameter NameAttribute value
battery chemistryLi-ion/polymer
Number of batteries2
Current - chargingConstant current - programmable
Programmable featurescurrent, timer
failsafeover temperature
Charging current - maximum4A
Battery pack voltage8.2V
Voltage - Power Supply (Highest)32V
interface-
Operating temperature-40°C ~ 125°C (TJ)
Package/casing36-WFQFN Exposed Pad
Supplier device packaging36-QFN(5x6)
LT3651-8.2/LT3651-8.4
Monolithic 4A High Voltage
2-Cell Li-Ion Battery Charger
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
DESCRIPTION
The
LT
®
3651-8.2/LT3651-8.4
are 2-cell, 4A Li-Ion/Poly-
mer 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 cur-
rent 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.
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
APPLICATIONS
n
n
n
n
Industrial Handheld Instruments
12V to 24V Automotive and Heavy Equipment
Desktop Cradle Chargers
Notebook Computers
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V to 32V 2-Cell 4A Charger
V
IN
12V TO 32V
Si7611DN
100k
10k
22µF
TO
SYSTEM
LOAD
91
EFFICIENCY
90
1µF
CMPSH1-4
SENSE
24m
100µF
10µH
WÜRTH 74477010
EFFICIENCY (%)
V
BAT
= 7.8V
I
BAT
= 4A
4.5
POWER LOSS (W)
Efficiency, Power Loss vs V
IN
5.0
10V
CLP
SHDN
ACPR
FAULT
CHRG
RT
CLN
V
IN
SW
BOOST
LT3651-8.2/LT3651-8.4
89
4.0
88
3.5
POWER LOSS
301k
BAT
NTC
TIMER
I
LIM
RNG/SS GND
+
2-CELL
Li-Ion
BATTERY
365188284 TA01a
87
10
15
20
V
IN
(V)
25
30
35
3.0
36518284 TA01b
36518284fa
For more information
www.linear.com/LT3651-8.2
1

LT3651EUHE-8.2#TRPBF Related Products

LT3651EUHE-8.2#TRPBF LT3651EUHE-8.4#TRPBF LT3651IUHE-8.2#PBF LT3651IUHE-8.4#TRPBF LT3651IUHE-8.2#TRPBF LT3651EUHE-8.4#PBF LT3651EUHE-8.2#PBF LT3651IUHE-8.4#PBF
Description IC CHRG MGMT LI-ION/LI-POL 36QFN IC CHRG MGMT LI-ION/LI-POL 36QFN IC CHRG MGMT LI-ION/LI-POL 36QFN IC CHRG MGMT LI-ION/LI-POL 36QFN IC CHRG MGMT LI-ION/LI-POL 36QFN IC CHRG MGMT LI-ION/LI-POL 36QFN IC CHRG MGMT LI-ION/LI-POL 36QFN IC CHRG MGMT LI-ION/LI-POL 36QFN
battery chemistry Li-ion/polymer Li-ion/polymer Li-ion/polymer Li-ion/polymer Li-ion/polymer Li-ion/polymer Li-ion/polymer Li-ion/polymer
Number of batteries 2 2 2 2 2 2 2 2
Current - charging Constant current - programmable Constant current - programmable Constant current - programmable Constant current - programmable Constant current - programmable Constant current - programmable Constant current - programmable Constant current - programmable
Programmable features current, timer current, timer current, timer current, timer current, timer current, timer current, timer current, timer
failsafe over temperature over temperature over temperature over temperature over temperature over temperature over temperature over temperature
Charging current - maximum 4A 4A 4A 4A 4A 4A 4A 4A
Battery pack voltage 8.2V 8.4V 8.2V 8.4V 8.2V 8.4V 8.2V 8.4V
Voltage - Power Supply (Highest) 32V 32V 32V 32V 32V 32V 32V 32V
Operating temperature -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
Package/casing 36-WFQFN Exposed Pad 36-WFQFN Exposed Pad 36-WFQFN Exposed Pad 36-WFQFN Exposed Pad 36-WFQFN Exposed Pad 36-WFQFN Exposed Pad 36-WFQFN Exposed Pad 36-WFQFN Exposed Pad
Supplier device packaging 36-QFN(5x6) 36-QFN(5x6) 36-QFN(5x6) 36-QFN(5x6) 36-QFN(5x6) 36-QFN(5x6) 36-QFN(5x6) 36-QFN(5x6)
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