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
36 35 34 33 32 31 30 29
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-4.1#PBF
LT3651EUHE-4.1#TRPBF 365141
–40°C to 125°C
36-Lead (5mm
×
6mm) Plastic QFN
LT3651IUHE-4.1#PBF
LT3651IUHE-4.1#TRPBF 365141
–40°C to 125°C
36-Lead (5mm
×
6mm) Plastic QFN
LT3651EUHE-4.2#PBF
LT3651EUHE-4.2#TRPBF 365142
–40°C to 125°C
36-Lead (5mm
×
6mm) Plastic QFN
LT3651IUHE-4.2#PBF
LT3651IUHE-4.2#TRPBF 365142
–40°C to 125°C
36-Lead (5mm
×
6mm) Plastic QFN
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/
365142ff
2
For more information
www.linear.com/LT3651-4.1
LT3651-4.1/LT3651-4.2
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Operating Range
V
IN
OVLO Threshold
V
IN
OVLO Hysteresis
V
IN
UVLO Threshold
V
IN
UVLO Hysteresis
Battery Float Voltage, V
BAT(FLT)
LT3651-4.1
l
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(FLT)
,
C
TIMER
= 0.68µF R
T
= 50k, CLP = CLN = V
IN
, BOOST – SW = 4V.
,
CONDITIONS
l
MIN
6.5
32
l
TYP
35
1.1
4.6
0.2
MAX
32
40
4.8
4.12
4.14
4.22
4.24
UNITS
V
V
V
V
V
V
V
mV
V
V
mV
mA
µA
µA
mV
mV
mA
mA/A
mV
V
IN
Rising
V
IN
Rising
4.08
4.05
4.18
4.16
4.1
4.2
–105
2.85
2.9
70
8.6
85
17
480
–140
40
25
14
LT3651-4.2
l
Battery Recharge Voltage Hysteresis
Battery Precondition Threshold Voltage,
V
BAT(PRE)
Battery Precondition Threshold Hysteresis
Operating V
IN
Supply Current
Top Switch On Voltage
Bottom Switch On Voltage
BOOST Supply Current
BOOST Switch Drive
Precondition Current Sense Voltage
Input Current Limit Voltage
CLP Input Bias Current
CLN Input Bias Current
I
LIM
Bias Current
System Current Limit Programming Gain
Maximum Charge Current Sense Voltage
C/10 Trigger Sense Voltage
BAT Input Bias Current
SENSE Input Bias Current
RNG/SS Bias Current
Charge Current Limit Programming Gain
NTC Range Limit (High)
NTC Range Limit (Low)
NTC Threshold Hysteresis
NTC Disable Impedance
NTC Bias Current
Shutdown Threshold
Shutdown Hysteresis
SHDN
Input Bias Current
Status Low Voltage
Threshold Voltage Relative to V
BAT(FLT)
LT3651-4.1 V
BAT
Rising
LT3651-4.2 V
BAT
Rising
Threshold Voltage Relative to V
BAT(PRE)
CC/CV Mode, Top Switch On, I
SW
= 0A
Standby Mode
Shutdown (SHDN = 0V)
V
IN
– V
SW
, I
SW
= 4A
V
SW
, I
SW
= 4A
Switch High, I
SW
= 0A, 2.5V < (V
BOOST
– V
SW
) < 4.5V
I
BOOST
/I
SW
, I
SW
= 4A
V
SENSE
– V
BAT
, V
BAT
= 2.5V
V
CLP
– V
CLN
, I
LIM
Open
l
70
95
120
36
115
mV
nA
µA
l
43
88
4.5
50
11.5
95
8.6
0.1
0.1
57
103
12.3
1
1
56
12.5
1.45
0.31
µA
V/V
mV
mV
µA
µA
µA
V/V
V
V
%
kΩ
V
ILIM
/(V
CLP
– V
CLN
), V
ILIM
= 0.5V
V
SENSE
– V
BAT
, V
BAT
= 3.5V, V
RNG/SS
> 1.1V
V
SENSE
– V
BAT
Charging Terminated
Charging Terminated
l
l
l
44
8.5
1.25
0.27
150
46.5
1.15
50
10.8
1.36
0.29
10
470
50
1.20
95
–10
V
RNG/SS
/(V
SENSE
– V
BAT
), V
RNG/SS
= 0.5V
V
NTC
Rising
V
NTC
Falling
% of Threshold
Minimum External Impedance to GND
V
NTC
= 0.75V
V
SHDN
Rising
l
l
l
l
l
l
53.5
1.23
µA
V
mV
nA
V
CHRG
, V
FAULT
, V
ACPR
, Load = 10mA
l
0.45
V
365142ff
For more information
www.linear.com/LT3651-4.1
3
LT3651-4.1/LT3651-4.2
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(FLT)
,
C
TIMER
= 0.68µF R
T
= 50k, CLP = CLN = V
IN
, BOOST – SW = 4V.
,
PARAMETER
TIMER Charge/Discharge Current
TIMER Disable Threshold
Full Charge Cycle Time-Out
Precondition Timeout
Timer Accuracy
Switcher Operating Frequency, f
O
Minimum SW On-Time, t
ON(MIN)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3651 is tested under pulse loaded conditions such that
T
J
= T
A
. The LT3651E is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3651I is guaranteed over the full –40°C to 125°C operating junction
R
T
= 50kΩ
R
T
= 250kΩ
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
0.1
TYP
25
0.25
3
22.5
MAX
UNITS
µA
V
Hour
Minute
–13
1.1
250
150
13
%
MHz
kHz
ns
temperature range. The junction temperature (T
J
in °C) is calculated from
the ambient temperature (T
A
in °C) and power dissipation (P
D
in Watts)
according to the formula:
T
J
= T
A
+ P
D
•
θ
JA
where
θ
JA
(in °C/W) is the package thermal impedance.
Note 3:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
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