LT3650-4.1/LT3650-4.2
High Voltage 2 Amp
Monolithic Li-Ion Battery Charger
FeaTures
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DescripTion
The LT
®
3650 is a complete monolithic single-cell Li-Ion/
Polymer battery charger that operates over a 4.75V to
32V input voltage range (7.5V minimum start-up voltage).
The LT3650 provides a constant-current/constant-voltage
charge characteristic, with maximum charge current
externally programmable up to 2A, set using an external
current sense resistor. A precondition feature trickle-
charges a low voltage battery, and bad-battery detection
provides a signal and suspends charging if a battery does
not respond to preconditioning.
The LT3650 can be configured to terminate charging when
charge current falls to C/10, or one-tenth the programmed
maximum current. Once charging is terminated, the LT3650
enters a low current (85µA) standby mode. An auto-restart
feature starts a new charging cycle if the battery voltage
drops 2.5% from the float voltage, or if a new battery is
inserted into a charging system.
The LT3650 contains a user-programmable internal safety
timer (typically set to a three hour full cycle time). The IC
can be configured to use this internal timer if a time-based
termination scheme is desired in which charging can con-
tinue below C/10 until a desired time is reached.
The LT3650 is available in a low profile (0.75mm) 3mm ×
3mm 12-pin DFN and 12-pin MSOP packages.
L,
LT, LTC, LTM, Linear Technology, PowerPath and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
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Wide Input Voltage Range: 4.75V to 32V
(40V Absolute Maximum)
Programmable Charge Current Up to 2A
User-Selectable Termination: C/10 or Onboard
Termination Timer
Dynamic Charge Rate Programming/Soft-Start Pin
Programmable Input Current Limit
No V
IN
Blocking Diode Required
1MHz Fixed Frequency
Average Current Mode Control
0.5% Float Voltage Accuracy
5% Charge Current Accuracy
2.5% 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
Binary Coded Open-Collector Status Pins
3mm × 3mm DFN-12 or MSOP-12 Package
applicaTions
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Industrial Handheld Instruments
12V to 24V Automotive and Heavy Equipment
Desktop Cradle Chargers
Notebook Computers
Typical applicaTion
7.5V to 32V Single-Cell Li-Ion 2A Charger
V
IN
7.5V to 32V
10µF
CMSH3-40MA
V
IN
CLP
LT3650-4.2
SHDN
CHRG
FAULT
TIMER
BAT
NTC
RNG/SS
10µF
SENSE
0.05
SW
EFFICIENCY (%)
1µF
BOOST
CMPSH1-4
6.8µH
90
100
V
BAT
and Efficiency vs I
BAT
V
BAT
4.20
V
IN
= 12V
V
IN
= 20V
4.15
V
BAT
(V)
80
4.10
70
+
Li-ION
BATTERY
3650 TA01a
4.05
60
0
0.5
1
I
BAT
(A)
1.5
2
365042 TA01b
36504142fc
1
LT3650-4.1/LT3650-4.2
absoluTe MaxiMuM raTings
(Note 1)
V
IN
............................................................................40V
SHDN, CHRG, FAULT
...............................V
IN
+ 0.5V, 40V
CLP .........................................................V
IN
± 0.5V, 40V
SW ............................................................................40V
SW-V
IN
.....................................................................4.5V
BOOST .................................................... SW + 10V, 50V
SENSE, BAT ..............................................................10V
SENSE-BAT ............................................... –0.5V to 0.5V
TIMER, RNG/SS, NTC ..............................................2.5V
Operating Junction Temperature Range
(Note 2).................................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE .................................................................. 300°C
pin conFiguraTion
TOP VIEW
V
IN
CLP
SHDN
CHRG
FAULT
TIMER
1
2
3
4
5
6
13
12 SW
11 BOOST
10 SENSE
9 BAT
8 NTC
7 RNG/SS
V
IN
CLP
SHDN
CHRG
FAULT
TIMER
1
2
3
4
5
6
TOP VIEW
12
11
10
9
8
7
SW
BOOST
SENSE
BAT
NTC
RNG/SS
13
DD PACKAGE
12-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 3°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 3°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT3650EDD-4.1#PBF
LT3650IDD-4.1#PBF
LT3650EDD-4.2#PBF
LT3650IDD-4.2#PBF
LT3650EMSE-4.1#PBF
LT3650IMSE-4.1#PBF
LT3650EMSE-4.2#PBF
LT3650IMSE-4.2#PBF
TAPE AND REEL
LT3650EDD-4.1#TRPBF
LT3650IDD-4.1#TRPBF
LT3650EDD-4.2#TRPBF
LT3650IDD-4.2#TRPBF
LT3650EMSE-4.1#TRPBF
LT3650IMSE-4.1#TRPBF
LT3650EMSE-4.2#TRPBF
LT3650IMSE-4.2#TRPBF
PART MARKING*
LFGQ
LFGQ
LDDS
LDDS
365041
365041
365042
365042
PACKAGE DESCRIPTION
12-Lead Plastic DFN (3mm × 3mm)
12-Lead Plastic DFN (3mm × 3mm)
12-Lead Plastic DFN (3mm × 3mm)
12-Lead Plastic DFN (3mm × 3mm)
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°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 nonstandard 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/
36504142fc
2
LT3650-4.1/LT3650-4.2
elecTrical characTerisTics
SYMBOL
LT3650
V
IN
V
IN(OVLO)
V
IN(UVLO)
V
BAT(FLT)
V
IN
Operating Range
V
IN
Start Voltage
OVLO Threshold
OVLO Hysteresis
UVLO Threshold
UVLO Hysteresis
Battery Float Voltage
(Note 3)
V
IN
Rising
V
IN
Rising
LT3650-4.1
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at V
IN
= 20V, BOOST-SW = 4V,
SHDN
= 2V, SENSE = BAT = V
BAT(FLT)
, C
TIMER
= 0.68µF.
PARAMETER
CONDITIONS
MIN
4.75
32
35
1
4.6
0.2
4.08
4.06
4.18
4.16
4.1
4.2
–100
2.9
90
CC/CV Mode, I
SW
= 0
Standby Mode
Shutdown (SHDN = 0)
Switch-On, I
SW
= 0
2.5V < V
(BOOST – SW)
< 4.5V
I
SW
= 2A
V
IN
– V
SW
, I
SW
= 2A
l
l
TYP
MAX
32
7.5
40
4.75
4.12
4.14
4.22
4.24
UNITS
V
V
V
V
V
V
V
V
V
V
mV
V
mV
LT3650-4.2
l
∆V
RECHRG
V
BAT(PRE)
V
BAT(PREHYST)
I
VIN
I
BOOST
I
BOOST
/I
SW
V
SW(ON)
I
SW(MAX)
V
SENSE(PRE)
V
CLP(DC)
I
CLP
V
SENSE(DC)
V
SENSE(C/10)
I
BAT
I
SENSE
I
REVERSE
V
NTC(H)
V
NTC(L)
V
NTC(HYST)
R
NTC(DIS)
I
NTC
I
RNG/SS
V
RNG/SS
/ V
SENSE
V
SHDN
V
SHDN(HYST)
I
SHDN
Recharge Battery Threshold
Battery Precondition Threshold Voltage
Battery Precondition Threshold
Hysteresis
Operating Input Supply Current
Threshold Voltage Relative to V
BAT(FLT)
V
BAT
Rising
2.5
85
15
20
30
350
2.5
15
3.5
mA
µA
µA
mA
mA/A
mV
A
mV
BOOST Supply Current
BOOST Switch Drive
Switch-On Voltage Drop
Switch Current Limit
Precondition Current Sense Voltage
CLP Threshold Voltage
CLP Input Bias Current
Maximum Current Sense Voltage
C/10 Trigger Sense Voltage
BAT Input Bias Current
SENSE Input Bias Current
Charger Reverse Current:
I
BAT
+ I
SENSE
+ I
SW
NTC Range Limit (High)
NTC Range Limit (Low)
NTC Threshold Hysteresis
NTC Disable Impedance
NTC Bias Current
I
RNG/SS
Bias Current
Current Limit Programming:
V
RNG/SS
/V
SENSE(MAX)
Shutdown Threshold
Shutdown Hysteresis
SHDN
Input Bias Current
V
SENSE
– V
BAT
V
BAT
= 2.5
V
CLP
– V
IN
; V
SENSE
– V
BAT
= 50mV
l
37.5
95
7.5
50
200
100
10
0.1
0.1
1
62.5
105
12.5
1
1
mV
nA
mV
mV
µA
µA
µA
V
SENSE
– V
BAT
; V
BAT
= 3.5V, V
RNG/SS
= 1.2V
l
l
Charging Terminated
Charging Terminated
V
IN
= 0V; BAT = SENSE = SW = V
BAT(FLT)
V
NTC
Rising
V
NTC
Falling
% of Threshold
Minimum External Impedance to GND
V
NTC
= 0.8V
V
RNG/SS
= 0.5
Rising
l
l
l
l
1.25
0.27
250
47.5
45
8.5
1.17
1.36
0.29
20
500
50
50
10
1.20
120
–10
1.45
0.315
V
V
%
kΩ
l
l
l
l
l
52.5
55
11.5
1.23
µA
µA
V/V
V
mV
nA
36504142fc
3
LT3650-4.1/LT3650-4.2
elecTrical characTerisTics
SYMBOL
V
CHRG
, V
FAULT
I
TIMER
V
TIMER(DIS)
t
TIMER
PARAMETER
Status Low Voltage
Charge/Discharge Current
Timer Disable Threshold
Full Charge Cycle Timeout
Precondition Timeout
Timer Accuracy
f
O
DC
Operating Frequency
Duty Cycle Range
Continuous Operation
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at V
IN
= 20V, BOOST-SW = 4V,
SHDN
= 2V, SENSE = BAT = V
BAT(FLT)
, C
TIMER
= 0.68µF.
CONDITIONS
10mA Load
l
MIN
TYP
25
MAX
0.4
UNITS
V
µA
V
hr
min
0.1
0.25
3
22.5
–10
0.9
15
1
10
1.1
90
%
MHz
%
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 LT3650E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3650I specifications are
guaranteed over the full –40°C to 85°C temperature range. High junction
temperatures degrade operating lifetimes.
Note 3:
V
IN
voltages below the start threshold are only supported if
(V
BOOST
– V
SW
) > 2V.
Typical perForMance characTerisTics
Battery Float Voltage
vs Temperature
0.1
T
A
= 25°C, unless otherwise noted.
Maximum Charge Current vs I
RNG/SS
Voltage, I
CHG(MAX)
as a Percentage
of Programmed I
MAX
100
95
I
VIN
CURRENT (µA)
90
V
IN
Standby Mode Current
vs Temperature
100
80
I
CHG(MAX)
(%)
0.05
∆V
BAT(FLT)
(%)
85
80
75
70
60
0
40
–0.05
20
– 0.1
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
3650 G01
65
–50
–25
50
0
25
TEMPERATURE (°C)
75
100
365042 G02
0
0
0.2
0.4
0.6
V
RNG/SS
0.8
1.0
1.2
365042 G03
36504142fc
4
LT3650-4.1/LT3650-4.2
Typical perForMance characTerisTics
36
33
SWITCH FORWARD DROP (mV)
30
27
24
I
SW
/I
BOOST
21
18
15
12
9
6
3
0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
I
SW
(A)
365042 G04
T
A
= 25°C, unless otherwise noted.
CC/CV Charging; SENSE Pin Bias
Current vs V
SENSE
LT3650-4.2
Switch Drive (I
SW
/I
BOOST
)
vs I
SW
480
460
440
Switch Forward Drop (V
IN
– V
SW
)
vs Temperature
I
SW
= 2A
100
50
0
–50
I
SENSE
(µA)
–100
–150
–200
–250
–300
420
400
380
360
340
320
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
–350
0
0.5
1
1.5
365042 G05
2 2.5 3
V
SENSE
(V)
3.5
4
4.5
365042 G06
C/10 Threshold (V
SENSE
– V
BAT
)
vs Temperature
12
51.0
50.8
11
V
SENSE
– V
BAT
(mV)
V
CLP
– V
IN
(mV)
50.6
CLP Input Limit Threshold
(V
CLP
– V
IN
) vs Temperature,
I
CHG
at 50%
I
MAX
Current Limit (V
SENSE
– V
BAT
)
vs Temperature
101.0
100.8
100.6
V
SENSE
– V
BAT
(mV)
100.4
100.2
100.0
99.8
99.6
99.4
99.2
V
BAT
= 3.5V
50.4
50.2
50.0
49.8
49.6
49.4
49.2
10
9
8
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
365042 G07
49.0
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
99.0
–50
–25
365042 G08
50
25
0
75
TEMPERATURE (°C)
100
125
365042 G09
Thermal Foldback – I
MAX
Current Limit (V
SENSE
– V
BAT
)
vs Temperature
120
100
V
SENSE
– V
BAT
(mV)
80
60
40
20
0
CC/CV Charging; BAT Pin Bias
Current vs V
BAT
2.2
LT3650-4.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
–0.2
–0.4
0 0.5 1 1.5
5.0
4.5
4.0
BATTERY CURRENT (µA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
2 2.5
V
BAT
(V)
3
3.5
4
4.5
0
Battery Bias Current with Charger
Disabled (I
BAT
+ I
SENSE
+ I
BOOST
+ I
SW
)
I
BAT
(mA)
V
IN
FLOATING
V
IN
= 20V, V
SHDN
= 0V
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V
BAT
(V)
365042 G12
25 35 45 55 65 75 85 95 105 115 125 135
TEMPERATURE (°C)
365042 G10
365042 G11
36504142fc
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