EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
DHC PACKAGE
16-LEAD (5mm
×
3mm) PLASTIC DFN
(NOTE 6)
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 5°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3637EMSE#PBF
LTC3637IMSE#PBF
LTC3637HMSE#PBF
LTC3637MPMSE#PBF
LTC3637EDHC#PBF
LTC3637IDHC#PBF
LTC3637HDHC#PBF
LTC3637MPDHC#PBF
TAPE AND REEL
LTC3637EMSE#TRPBF
LTC3637IMSE#TRPBF
LTC3637HMSE#TRPBF
LTC3637MPMSE#TRPBF
LTC3637EDHC#TRPBF
LTC3637IDHC#TRPBF
LTC3637HDHC#TRPBF
LTC3637MPDHC#TRPBF
PART MARKING*
3637
3637
3637
3637
3637
3637
3637
3637
PACKAGE DESCRIPTION
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°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/
2
3637fa
For more information
www.linear.com/LTC3637
LTC3637
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
OUT
UVLO
PARAMETER
Input Voltage Operating Range
Output Voltage Operating Range
V
IN
Undervoltage Lockout
DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown Mode
RUN and OVLO Pin Threshold Voltage
V
IN
Rising
V
IN
Falling
Hysteresis
l
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, unless otherwise noted.
CONDITIONS
MIN
4
0.8
3.45
3.30
3.65
3.5
150
165
12
3
1.17
1.06
–10
1.21
1.10
110
0
TYP
MAX
76
V
IN
3.85
3.70
UNITS
V
V
V
V
mV
µA
µA
µA
V
V
mV
nA
Input Supply (V
IN
)
I
Q
No Load
RUN = 0V
Rising
Falling
Hysteresis
RUN = 1.3V
V
FB
Rising, V
PRG1
= V
PRG2
= 0V
LTC3637E, LTC3637I
LTC3637H, LTC3637MP
V
FB
Falling, V
PRG1
= V
PRG2
= 0V
V
FB
= 1V, V
PRG1
= 0V, V
PRG2
= 0V
V
FB
Rising, V
PRG1
= SS, V
PRG2
= 0V
V
FB
Falling, V
PRG1
= SS, V
PRG2
= 0V
V
FB
Rising, V
PRG1
= 0V, V
PRG2
= SS
V
FB
Falling, V
PRG1
= 0V, V
PRG2
= SS
V
FB
Rising, V
PRG1
= V
PRG2
= SS
V
FB
Falling, V
PRG1
= V
PRG2
= SS
l
l
l
l
l
l
350
20
10
1.25
1.14
10
RUN Pin Leakage Current
Output Supply (V
FB
)
Feedback Comparator Threshold Voltage
(Adjustable Output)
Feedback Comparator Hysteresis
(Adjustable Output)
Feedback Pin Current
Feedback Comparator Threshold Voltages
(Fixed Output)
l
l
l
0.792
0.788
2.5
–10
4.940
4.910
3.250
3.230
1.775
1.765
0.800
0.800
5
0
5.015
4.985
3.310
3.290
1.805
1.795
0.001
0.808
0.812
7
10
5.090
5.060
3.370
3.350
1.835
1.825
V
V
mV
nA
V
V
V
V
V
V
%/V
Feedback Voltage Line Regulation
Operation
Peak Current Comparator Threshold
V
IN
= 4V to 76V
I
SET
Floating
100k Resistor from I
SET
to GND
I
SET
Shorted to GND
I
SW
= –200mA
V
IN
= 65V, SW = 0V
SS Pin < 2.5V
SS Pin Floating
3
l
l
l
2
0.9
0.17
2.4
1.2
0.24
0.35
0.1
5
0.8
2.8
1.5
0.31
1
6
A
A
A
Ω
μA
μA
ms
Power Switch On-Resistance
Switch Pin Leakage Current
Soft-Start Pin Pull-Up Current
Internal Soft-Start Time
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 LTC3637 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3637E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3637I is guaranteed
over the –40°C to 125°C operating junction temperature range, the
LTC3637H is guaranteed over the –40°C to 150°C operating junction
temperature range and the LTC3637MP is tested and guaranteed over the
–55°C to 150°C operating junction temperature range.
High junction temperatures degrade operating lifetimes; operating lifetime
is derated for junction temperatures greater than 125°C. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors.
Note 3:
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
is 43°C/W for the DFN or 45°C/W for the MSOP
.
3637fa
For more information
www.linear.com/LTC3637
3
LTC3637
ELECTRICAL CHARACTERISTICS
Note that the maximum ambient temperature consistent with these
specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 4:
This IC includes over temperature 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
the device. The overtemperature protection level is not production tested.
Note 5:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6:
For application concerned with pin creepage and clearance
distances at high voltages, the MSOP package should be used. See
京公网安备 11010802033920号
EEWORLD
