LT3653E .............................................–40°C to 125°C
LT3653I ..............................................–40°C to 125°C
Storage Temperature..............................–65°C to 150°C
DCB PACKAGE
8-LEAD (2mm 3mm) PLASTIC DFN
θ
JA
= 64°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3653EDCB#PBF
LT3653IDCB#PBF
TAPE AND REEL
LT3653EDCB#TRPBF
LT3653IDCB#TRPBF
PART MARKING*
LDJN
LDJN
PACKAGE DESCRIPTION
8-Lead (2mm
×
3mm) Plastic DFN
8-Lead (2mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–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/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C; V
IN
= 12V, V
BOOST
= 17V, V
SW
= 0V, R
ILIM
= 33.2k, unless otherwise noted.
PARAMETER
V
IN
Operating Range
V
IN
Undervoltage Lockout
V
IN
Undervoltage Hysteresis
V
IN
Overvoltage Lockout
V
IN
Overvoltage Lockout Hysteresis
V
IN
Supply Current
V
OUT
Reverse Leakage Current
V
OUT
Nominal Set Point
V
OUT
Current Limit Range
V
OUT
Current Limit
Operating Frequency
V
C
Source Current
V
C
Sink Current
V
C
Switching Threshold
V
OUT
= 0V, V
C
= 1.5V
V
OUT
= 5V, V
C
= 1.5V
I
OUT
= 0mA
R
ILIM
= 33.2k
Not Switching
V
IN
= 0V, V
OUT
= 4.8V
V
IN
= Open, V
OUT
= 4.8V
V
C
Pin = Open
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l
TYP
7
500
33
1
2.8
MAX
30
7.5
36
3.4
1
1
UNITS
V
V
mV
V
V
mA
μA
μA
V
A
A
A
kHz
μA
μA
V
7.5
6.5
30
Rising
Rising
4.8
0.4
0.85
0.80
1350
1
1
1500
12
10
1.1
5
1.2
1.15
1.2
1650
3653f
2
LT3653
ELECTRICAL CHARACTERISTICS
PARAMETER
V
C
Clamp Voltage
Switch Peak Current Limit
Switch V
CESAT
Boost Diode Drop
Boost Pin Current
HVOK Output Voltage High
HVOK Output Voltage Low
CONDITIONS
V
OUT
= 0V
(Note 4)
I
SW
= 1A
I
DIODE
= 60mA
I
SW
= 1A
I
HVOK
= 1mA
I
HVOK
= –2μA
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C; V
IN
= 12V, V
BOOST
= 17V, V
SW
= 0V, R
ILIM
= 33.2k, unless otherwise noted.
MIN
TYP
1.75
2
275
0.9
28
4
4.4
5
0.25
1.2
MAX
UNITS
V
A
mV
V
mA
V
V
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 LT3653E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization, and correlation
with statistical process controls. The LT3653I specifications are
guaranteed over the full –40°C to 125°C temperature range. High junction
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 3:
Absolute Maximum Voltage at V
IN
pin is 60V for non-repetitive
1 second transients.
Note 4:
Switch Peak Current Limit guaranteed by design and/or correlation
to static test.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability.
3653f
3
LT3653
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Voltage Drop
400
350
SWITCHING FREQUENCY (MHz)
SWITCH VOLTAGE DROP (mV)
300
250
200
150
100
50
0
0
0.2
0.4
0.6
0.8
SWITCH CURRENT (A)
1
1.2
3653 G01
T
A
= 25°C unless otherwise noted
Switching Frequency
125ºC
25ºC
1.7
1.6
INPUT VOLTAGE (V)
1.5
1.4
1.3
1.2
1.1
1.0
–50
8.0
7.5
Undervoltage Lockout
RISING
7.0
6.5
6.0
5.5
5.0
4.5
-25
0
25
50
75
TEMPERATURE (ºC)
100
125
4.0
–50 -25
0
25 50 75 100 125 150
TEMPERATURE (ºC)
3653 G03
–45ºC
FALLING
3653 G02
Output Current Limit
1.2
R
ILIM
= 33.2k
1.15
OUTPUT VOLTAGE (V)
1.1
CURRENT LIMIT (A)
1.05
1
0.95
0.9
0.85
0.8
–50 –25
0
25
50
75
TEMPERATURE (ºC)
100
125
1
0
5
4
3
2
6
Output Current Limit
R
ILIM
= 27.4k
35
V
IN
Overvoltage Lockout
RISING
INPUT VOLTAGE (V)
33
FALLING
31
29
27
25
–50
0
0.2
0.4 0.6 0.8
1
OUTPUT CURRENT (A)
1.2
1.4
–25
0
25
50
75
TEMPERATURE (ºC)
100
125
3653 G04
3653 G05
3653 G06
BOOST Pin Current
35
30
BOOST PIN CURRENT (mA)
BOOST DIODE V
F
(V)
25
20
15
10
5
0
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Boost Diode V
F
0
0.2
0.4
0.5
0.8
SWITCH CURRENT (A)
1
1.2
3653 G07
0
50
100
150
200
DIODE CURRENT (mA)
250
300
3653 G08
3653f
4
LT3653
TYPICAL PERFORMANCE CHARACTERISTICS
V
C
Current
15
10
VC PIN CURRENT (μA)
5
0
–5
–10
–15
–20
–25
4
4.4
4.8
5.2
V
OUT
(V)
5.6
6
3653 G09
T
A
= 25°C unless otherwise noted
V
C
Operating Range
2.0
1.8
1.6
VC VOLTAGE (V)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
-25
0
25
50
75
TEMPERATURE (ºC)
100
125
SWITCHING THRESHOLD
CURRENT LIMIT CLAMP
3653 G10
PIN FUNCTIONS
V
IN
(Pin 1):
The V
IN
pin supplies current to the LT3653’s
internal regulator and the internal power switch. Locally
bypass this pin with a capacitor.
HVOK (Pin 2):
The HVOK pin is a status pin which indi-
cates that the internal bias rail is present and that an input
undervoltage lockout fault, an overvoltage lockout fault or
an over temperature fault are not present.
V
C
(Pin 3):
The V
C
pin is the output of the internal error
amplifier and is internally compensated. The voltage on this
pin controls the peak switch current. Connect this pin to
the battery charger V
C
pin for battery tracking function.
I
LIM
(Pin 4):
Connect a resistor to GND to program the
output current limit of the regulator. See the I
LIM
Resistor
section in Application Information.
V
OUT
(Pin 5):
The V
OUT
pin is connected to the negative
terminal of the internal current sense resistor of the output
current limit circuit. Maximum V
OUT
voltage is regulated
to 4.8V.
I
SENSE
(Pin 6):
The I
SENSE
pin is the positive input to the
internal current sense resistor of the output current limit
circuit. The I
SENSE
pin is also the anode of the internal
BOOST diode.
BOOST (Pin 7):
The BOOST pin provides a drive voltage,
higher than the input voltage, to the internal power switch.
The BOOST pin is internally connected to the cathode of
the BOOST diode.
SW (Pin 8):
The SW pin is the output of the internal power
switch. Connect this pin to the inductor, catch diode and
boost capacitor.
Exposed Pad (Pin 9):
Ground. The Exposed Pad must be
soldered to the PCB and electrically connected to ground.
Use a large ground plane and vias to optimize thermal
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