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LT3651EUHE-8.4#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3651-8.2/LT3651-8.4
1
36518284fa
For more information www.linear.com/LT3651-8.2
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Monolithic 4A High Voltage
2-Cell Li-Ion Battery Charger
n
Industrial Handheld Instruments
n
12V to 24V Automotive and Heavy Equipment
n
Desktop Cradle Chargers
n
Notebook Computers
12V to 32V 2-Cell 4A Charger Efficiency, Power Loss vs V
IN
n
Wide Input Voltage Range: 9V to 32V
(40V Absolute Maximum)
n
Programmable Charge Current Up to 4A
n
Selectable C/10 or Onboard Timer Termination
n
Dynamic Charge Rate Programming/Soft-Start
n
Programmable Input Current Limit
n
±0.5% Float Voltage Accuracy
n
±7.5% Charge Current Accuracy
n
±4% C/10 Detection Accuracy
n
NTC Resistor Temperature Monitor
n
Auto-Recharge at 97.5% Float Voltage
n
Auto-Precondition at <70% Float Voltage
n
Bad Battery Detection with Auto-Reset
n
Average Current Mode, Synchronous Switcher
n
User Programmable Frequency
n
Low Profile (0.75mm) 5mm × 6mm 36-Lead
QFN Package
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.
L, LT, LT C, LTM , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
RT
TIMER
BOOST
SENSE
BAT
I
LIM
RNG/SS
GND
NTC
CLP
CLN
1µF
100µF
2-CELL
Li-Ion
BATTERY
365188284 TA01a
10µH
WÜRTH 74477010
TO
SYSTEM
LOAD
24mΩ
301k
V
IN
12V TO 32V
CMPSH1-4
10V
Si7611DN
100k
10k
LT3651-8.2/LT3651-8.4
V
IN
22µF
FAULT
CHRG
ACPR
SHDN
+
SW
10
15
20
25
30
35
V
IN
(V)
87
88
89
90
91
EFFICIENCY (%)
36518284 TA01b
EFFICIENCY
POWER LOSS
I
BAT
= 4A
3.0
3.5
4.0
4.5
5.0
POWER LOSS (W)
LT3651-8.2/LT3651-8.4
2
36518284fa
For more information www.linear.com/LT3651-8.2
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
(Note 1)
11 12 13 14
TOP VIEW
37
GND
38
SW
UHE PACKAGE
36-LEAD (5mm
×
6mm) PLASTIC QFN
15 16 17 18
36 35 34 33 32 31 30 29
21
22
23
24
25
26
27
28
8
7
6
5
4
3
2
1NTC
ACPR
BAT
SENSE
BOOST
GND
SW
NC
NC
NC
I
LIM
SHDN
CHRG
FAULT
TIMER
GND
SW
NC
NC
NC
RT
RNG/SS
V
IN
V
IN
V
IN
GND
CLN
CLP
SW
SW
SW
SW
SW
SW
SW
SW
20
19
9
10
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 37) IS GND, MUST BE SOLDERED TO PCB
EXPOSED
PAD (PIN 38) IS SW, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3651EUHE-8.2#PBF LT3651EUHE-8.2#TRPBF 365182
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
LT3651IUHE-8.2#PBF LT3651IUHE-8.2#TRPBF 365182
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
LT3651EUHE-8.4#PBF LT3651EUHE-8.4#TRPBF 365184
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
LT3651IUHE-8.4#PBF LT3651IUHE-8.4#TRPBF 365184
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
V
IN
.......................................................................... 40V
CLN, CLP,
SHDN
,
CHRG
,
FAULT
,
ACPR
............................... V
IN
+ 0.5V Up to 40V
CLP – CLN .............................................................±0.5V
SW ...........................................................................40V
SW – V
IN
..................................................................4.5V
BOOST .......................................... SW + 10V Up to 50V
SENSE, BAT ............................................................ 10V
SENSE-BAT ............................................. –0.5V to 0.5V
TIMER, RNG/SS, I
LIM
, NTC, RT .............................. 2.5V
Operating Junction Temperature Range
(Notes 2, 3) ................................................–40 to 125°C
Storage Temperature Range ......................–65 to 150°C
LT3651-8.2/LT3651-8.4
3
36518284fa
For more information www.linear.com/LT3651-8.2
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 20V, SHDN = 2V, SENSE = BAT = V
BAT (F LT )
,
C
TIMER
= 0.68µF, R
T
= 50k, CLP = CLN = V
IN
, BOOST – SW = 4V.
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Range
l
9.0 32 V
V
IN
OVLO Threshold V
IN
Rising 32 35 40 V
V
IN
OVLO Hysteresis 1.1 V
V
IN
UVLO Threshold V
IN
Rising
l
8.7 9.0 V
V
IN
UVLO Hysteresis 0.2 V
Battery Float Voltage, V
BAT(FLT)
LT3651-8.2
l
8.16
8.12
8.2 8.24
8.28
V
V
LT3651-8.4
l
8.36
8.32
8.4 8.44
8.48
V
V
Battery Recharge V
oltage Hysteresis Threshold Voltage Relative to V
BAT(FLT)
–200 mV
Battery Precondition Threshold Voltage, V
BAT(PRE)
LT3651-8.2, V
BAT
Rising
LT3651-8.4, V
BAT
Rising
5.65
5.80
V
V
Battery Precondition Threshold Hysteresis Threshold Voltage Relative to V
BAT(PRE)
90 mV
Operating V
IN
Supply Current CC/CV Mode, Top Switch On, I
SW
= 0
Standby Mode
Shutdown (SHDN = 0)
8.6
80
17
mA
µA
µA
Top Switch On V
oltage V
IN
– V
SW
, I
SW
= 4A 480 mV
Bottom Switch On Voltage V
SW
, I
SW
= 4A –140 mV
BOOST Supply Current Switch High, I
SW
= 0, 2.5V < (V
BOOST
– V
SW
) < 8.5V 17 mA
BOOST Switch Drive I
BOOST
/I
SW
, I
SW
= 4A 22 mA/A
Precondition Current Sense Voltage V
SENSE
– V
BAT
, V
BAT
= 5.0V 14 mV
Input Current Limit Voltage V
CLP
– V
CLN
, I
LIM
Open
l
70 95 115 mV
CLP Input Bias Current 120 nA
CLN Input Bias Current 36 µA
I
LIM
Bias Current
l
43 50 57 µA
System Current Limit Programming Gain V
ILIM
/(V
CLP
– V
CLN
), V
ILIM
= 0.5V 11.5 V/V
Maximum Charge Current Sense Voltage V
SENSE
– V
BAT
, V
BAT
= 7.5V, V
RNG/SS
> 1.1V
l
88 95 103 mV
C/10 Trigger Sense Voltage V
SENSE
– V
BAT
l
4.5 8.6 12.3 mV
BAT Input Bias Current Charging Terminated 0.1 1 µA
SENSE Input Bias Current Charging Terminated 0.1 1 µA
RNG/SS Bias Current
l
44 50 56 µA
Charge Current Limit Programming Gain V
RNG/SS
/(V
SENSE
– V
BAT
), V
RNG/SS
= 0.5V
l
8.5 10.8 12.5 V/V
NTC Range Limit (High) V
NTC
Rising
l
1.25 1.36 1.45 V
NTC Range Limit (Low) V
NTC
Falling
l
0.27 0.29 0.31 V
NTC Threshold Hysteresis % of Threshold 10 %
NTC Disable Impedance Minimum External Impedance to GND
l
150 470 kΩ
NTC Bias Current V
NTC
= 0.75V
l
46.5 50 53.5 µA
Shutdown Threshold V
SHDN
Rising
l
1.15 1.20 1.23 V
Shutdown Hysteresis 95 mV
SHDN Input Bias Current –10 nA
Status Low Voltage V
CHRG
, V
FAULT
, V
ACPR
, Load = 10mA
l
0.45 V
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LT3651EUHE-8.4#PBF

Mfr. #:
Buy LT3651EUHE-8.4#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Monolithic 4A High Voltage Li-Ion Battery Charger
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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