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LTC3637HMSE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3637
1
3637fa
For more information www.linear.com/LTC3637
TYPICAL APPLICATION
FEATURES DESCRIPTION
76V, 1A Step-Down
Regulator
The LTC
®
3637 is a high efficiency step-down DC/DC
regulator with an internal high side power switch that
draws only 12μA DC supply current while maintaining a
regulated output voltage at no load.
The LTC3637 can supply up to 1A load current and features
a programmable peak current limit that provides a simple
method for optimizing efficiency and for reducing output
ripple and component size. The LTC3637’s combination
of Burst Mode
®
operation, integrated power switch, low
quiescent current, and programmable peak current limit
provides high efficiency over a broad range of load currents.
With its wide input range of 4V to 76V, and programmable
overvoltage lockout, the LTC3637 is a robust regulator
suited for regulating from a wide variety of power sources.
Additionally, the LTC3637 includes a precise run threshold
and soft-start feature to guarantee that the power system
start-up is well-controlled in any environment.
The LTC3637 is available in the thermally-enhanced
3mm × 5mm DFN and the MSE16 packages.
Efficiency and Power Loss vs Load Current
APPLICATIONS
n
Wide Operating Input Voltage Range: 4V to 76V
n
Internal 350mΩ Power MOSFET
n
No Compensation Required
n
Adjustable 100mA to 1A Maximum Output Current
n
Low Dropout Operation: 100% Duty Cycle
n
Low Quiescent Current: 12µA
n
Wide Output Range: 0.8V to V
IN
n
0.8V ±1% Feedback Voltage Reference
n
Precise RUN Pin Threshold
n
Internal and External Soft-Start
n
Programmable 1.8V, 3.3V, 5V or Adjustable Output
n
Few External Components Required
n
Programmable Input Overvoltage Lockout
n
Low Profile (0.75mm) 3mm × 5mm DFN and
Thermally-Enhanced MSE16 Packages
n
Industrial Control Supplies
n
Medical Devices
n
Distributed Power Systems
n
Portable Instruments
n
Battery-Operated Devices
n
Automotive
n
Avionics
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
V
FB
V
PRG2
SW
10µH
V
IN
RUN
FBO
47µF
2.2µF
200k
V
OUT
12V
1A
V
IN
12.5V TO 76V
3637 TA01a
OVLO
SS
V
PRG1
I
SET
GND
LTC3637
35.7k
12.5V to 76V Input to 12V Output, 1A Regulator
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (mW)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3637 TA01b
0
10
1000
100
0
1.0
V
IN
= 24V
V
IN
= 48V
V
IN
= 76V
EFFICIENCY
POWER LOSS
V
OUT
= 12V
LTC3637
2
3637fa
For more information www.linear.com/LTC3637
ABSOLUTE MAXIMUM RATINGS
V
IN
Supply Voltage ..................................... –0.3V to 80V
RUN Voltage............................................... –0.3V to 80V
SS, FBO, I
SET
Voltages ................................. –0.3V to 6V
V
FB
, V
PRG1
, V
PRG2
, OVLO Voltages .............. –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3, 4)
LTC3637E, LTC3637I ......................... –40°C to 125°C
LTC3637H .......................................... –40°C to 150°C
LTC3637MP ....................................... –55°C to 150°C
(Note 1)
1
3
5
6
7
8
SW
V
IN
FBO
V
PRG2
V
PRG1
GND
16
14
12
11
10
9
GND
RUN
OVLO
I
SET
SS
V
FB
TOP VIEW
17
GND
MSE PACKAGE
VARIATION: MSE16 (12)
16-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
16
15
14
13
12
11
10
9
17
GND
1
2
3
4
5
6
7
8
GND
NC
RUN
NC
OVLO
I
SET
SS
V
FB
SW
NC
V
IN
NC
FBO
V
PRG2
V
PRG1
GND
TOP VIEW
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
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3637EMSE#PBF LTC3637EMSE#TRPBF 3637 16-Lead Plastic MSOP –40°C to 125°C
LTC3637IMSE#PBF LTC3637IMSE#TRPBF 3637 16-Lead Plastic MSOP –40°C to 125°C
LTC3637HMSE#PBF LTC3637HMSE#TRPBF 3637 16-Lead Plastic MSOP –40°C to 150°C
LTC3637MPMSE#PBF LTC3637MPMSE#TRPBF 3637 16-Lead Plastic MSOP –55°C to 150°C
LTC3637EDHC#PBF LTC3637EDHC#TRPBF 3637
16-Lead (5mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3637IDHC#PBF LTC3637IDHC#TRPBF 3637
16-Lead (5mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3637HDHC#PBF LTC3637HDHC#TRPBF 3637
16-Lead (5mm × 3mm) Plastic DFN
–40°C to 150°C
LTC3637MPDHC#PBF LTC3637MPDHC#TRPBF 3637
16-Lead (5mm × 3mm) Plastic DFN
–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/
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ...............................................................300°C
LTC3637
3
3637fa
For more information www.linear.com/LTC3637
ELECTRICAL CHARACTERISTICS
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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply (V
IN
)
V
IN
Input Voltage Operating Range 4 76 V
V
OUT
Output Voltage Operating Range 0.8 V
IN
V
UVLO V
IN
Undervoltage Lockout V
IN
Rising
V
IN
Falling
Hysteresis
l
l
3.45
3.30
3.65
3.5
150
3.85
3.70
V
V
mV
I
Q
DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown Mode
No Load
RUN = 0V
165
12
3
350
20
10
µA
µA
µA
RUN and OVLO Pin Threshold Voltage Rising
Falling
Hysteresis
1.17
1.06
1.21
1.10
110
1.25
1.14
V
V
mV
RUN Pin Leakage Current RUN = 1.3V –10 0 10 nA
Output Supply (V
FB
)
Feedback Comparator Threshold Voltage
(Adjustable Output)
V
FB
Rising, V
PRG1
= V
PRG2
= 0V
LTC3637E, LTC3637I
LTC3637H, LTC3637MP
l
l
0.792
0.788
0.800
0.800
0.808
0.812
V
V
Feedback Comparator Hysteresis
(Adjustable Output)
V
FB
Falling, V
PRG1
= V
PRG2
= 0V
l
2.5 5 7 mV
Feedback Pin Current V
FB
= 1V, V
PRG1
= 0V, V
PRG2
= 0V –10 0 10 nA
Feedback Comparator Threshold Voltages
(Fixed Output)
V
FB
Rising, V
PRG1
= SS, V
PRG2
= 0V
V
FB
Falling, V
PRG1
= SS, V
PRG2
= 0V
l
l
4.940
4.910
5.015
4.985
5.090
5.060
V
V
V
FB
Rising, V
PRG1
= 0V, V
PRG2
= SS
V
FB
Falling, V
PRG1
= 0V, V
PRG2
= SS
l
l
3.250
3.230
3.310
3.290
3.370
3.350
V
V
V
FB
Rising, V
PRG1
= V
PRG2
= SS
V
FB
Falling, V
PRG1
= V
PRG2
= SS
l
l
1.775
1.765
1.805
1.795
1.835
1.825
V
V
Feedback Voltage Line Regulation V
IN
= 4V to 76V 0.001 %/V
Operation
Peak Current Comparator Threshold I
SET
Floating
100k Resistor from I
SET
to GND
I
SET
Shorted to GND
l
l
l
2
0.9
0.17
2.4
1.2
0.24
2.8
1.5
0.31
A
A
A
Power Switch On-Resistance I
SW
= –200mA 0.35 Ω
Switch Pin Leakage Current V
IN
= 65V, SW = 0V 0.1 1 μA
Soft-Start Pin Pull-Up Current SS Pin < 2.5V 3 5 6 μA
Internal Soft-Start Time SS Pin Floating 0.8 ms
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.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LTC3637HMSE#TRPBF

Mfr. #:
Buy LTC3637HMSE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators High Efficiency, 76V 1A Step-Down Regulator
Lifecycle:
New from this manufacturer.
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