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Linear Technology Electronic Components Datasheet

LTC3631 Datasheet

High Voltage 100mA Synchronous Step-Down Converter

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LTC3631
High Efficiency, High Voltage
100mA Synchronous
Step-Down Converter
FEATURES
DESCRIPTION
n Wide Input Voltage Range: Operation from 4.5V to 45V
n Overvoltage Lockout Provides Protection Up to 60V
n Internal High Side and Low Side Power Switches
n No Compensation Required
n 100mA Output Current
n Low Dropout Operation: 100% Duty Cycle
n Low Quiescent Current: 12μA
n 0.8V ±1% Feedback Voltage Reference
n Adjustable Peak Current Limit
n Internal and External Soft-Start
n Precise RUN Pin Threshold with Adjustable
Hysteresis
n 3.3V, 5V and Adjustable Output Versions
n Only Three External Components Required for Fixed
Output Versions
n Low Profile (0.75mm) 3mm × 3mm DFN and
Thermally-Enhanced MS8E Packages
APPLICATIONS
n 4mA to 20mA Current Loops
n Industrial Control Supplies
n Distributed Power Systems
n Portable Instruments
n Battery-Operated Devices
n Automotive Power Systems
The LTC®3631 is a high efficiency step-down DC/DC
converter with internal high side and synchronous power
switches that draws only 12μA typical DC supply current
at no load while maintaining output voltage regulation.
The LTC3631 can supply up to 100mA load current and
features a programmable peak current limit that provides
a simple method for optimizing efficiency in lower current
applications. The LTC3631’s combination of Burst Mode®
operation, integrated power switches, low quiescent cur-
rent, and programmable peak current limit provides high
efficiency over a broad range of load currents.
With its wide 4.5V to 45V input range and internal
overvoltage monitor capable of protecting the part through
60V surges, the LTC3631 is a robust converter suited for
regulating a wide variety of power sources. Additionally,
the LTC3631 includes a precise run threshold and soft-start
feature to guarantee that the power system start-up is
well-controlled in any environment.
The LTC3631 is available in the thermally enhanced
3mm × 3mm DFN and MS8E packages.
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.
TYPICAL APPLICATION
5V, 100mA Step-Down Converter
VIN
5V TO 45V
2.2μF
VIN SW
LTC3631-5
RUN
HYST
VOUT
SS
ISET
GND
100μH
3631 TA01a
VOUT
5V
10μF 100mA
Efficiency and Power Loss vs Load Current
100
90
EFFICIENCY
1000
80
70 100
60
POWER LOSS
50 10
40
30
20
0.1
VIN = 12V 1
VIN = 36V
1 10
LOAD CURRENT (mA)
100
3631 TA01b
3631fa
1


Linear Technology Electronic Components Datasheet

LTC3631 Datasheet

High Voltage 100mA Synchronous Step-Down Converter

No Preview Available !

LTC3631www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Supply Voltage..................................... –0.3V to 60V
SW Voltage (DC)............................–0.3V to (VIN + 0.3V)
RUN Voltage .............................................. –0.3V to 60V
VFB/VOUT, HYST, ISET, SS Voltages ................ –0.3V to 6V
Operating Junction Temperature Range
(Note 2).................................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS8E ................................................................ 300°C
PIN CONFIGURATION
TOP VIEW
SW 1
8 GND
VIN 2
ISET 3
9
7 HYST
6 VOUT/VFB
SS 4
5 RUN
MS8E PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W, θJC = 5°-10°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
SW 1
8 GND
VIN 2
7 HYST
9
ISET 3
6 VOUT/VFB
SS 4
5 RUN
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3631EMS8E#PBF
LTC3631EMS8E#TRPBF LTFDT
8-Lead Plastic MSOP
–40°C to 125°C
LTC3631EMS8E-3.3#PBF LTC3631EMS8E-3.3#TRPBF LTFFP
8-Lead Plastic MSOP
–40°C to 125°C
LTC3631EMS8E-5#PBF
LTC3631EMS8E-5#TRPBF LTFFR
8-Lead Plastic MSOP
–40°C to 125°C
LTC3631IMS8E#PBF
LTC3631IMS8E#TRPBF
LTFDT
8-Lead Plastic MSOP
–40°C to 125°C
LTC3631IMS8E-3.3E#PBF LTC3631IMS8E-3.3#TRPBF LTFFP
8-Lead Plastic MSOP
–40°C to 125°C
LTC3631IMS8E-5#PBF
LTC3631IMS8E-5#TRPBF LTFFR
8-Lead Plastic MSOP
–40°C to 125°C
LTC3631EDD#PBF
LTC3631EDD#TRPBF
LFDV
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3631EDD-3.3#PBF
LTC3631EDD-3.3#TRPBF LFFN
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3631EDD-5#PBF
LTC3631EDD-5#TRPBF
LFFQ
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3631IDD#PBF
LTC3631IDD#TRPBF
LFDV
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3631IDD-3.3#PBF
LTC3631IDD-3.3#TRPBF LFFN
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3631IDD-5#PBF
LTC3631IDD-5#TRPBF
LFFQ
8-Lead (3mm × 3mm) Plastic DFN
–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/
3631fa
2


Part Number LTC3631
Description High Voltage 100mA Synchronous Step-Down Converter
Maker Linear Technology Corporation
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LTC3631 Datasheet PDF






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