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LTC3632 Datasheet

High Voltage 20mA Synchronous Step-Down Converter

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LTC3632
High Efficiency, High Voltage
20mA Synchronous
Step-Down Converter
FEATURES
n Wide Input Voltage Range: Operation from
4.5V to 50V
n Overvoltage Lockout Provides Protection Up to 60V
n Internal High Side and Low Side Power Switches
n No Compensation Required
n 20mA Output Current
n Low Dropout Operation: 100% Duty Cycle
n Low Quiescent Current: 12µA
n Wide Output Voltage Range: 0.8V to VIN
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 Few External Components Required
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
DESCRIPTION
The LTC®3632 is a high efficiency, high voltage step-down
DC/DC converter with internal high side and synchronous
power switches that draws only 12μA typical DC sup-
ply current at no load while maintaining output voltage
regulation.
The LTC3632 can supply up to 20mA load current and
features a programmable peak current limit that provides
a simple method for optimizing efficiency in lower current
applications. The LTC3632’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 50V input range and internal
overvoltage monitor capable of protecting the part through
60V surges, the LTC3632 is a robust converter suited for
regulating a wide variety of power sources. Additionally,
the LTC3632 includes a precise run threshold and soft‑start
feature to guarantee that the power system start-up is
well-controlled in any environment.
The LTC3632 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
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
VIN
5V TO 50V
1µF
5V, 20mA Step-Down Converter
VIN SW
LTC3632
RUN
HYST
VFB
ISET SS
GND
1mH
1.47M
280k
3632 TA01a
VOUT
5V
10µF 20mA
Efficiency and Power Loss vs Load Current
100
90
80 EFFICIENCY
1000
70 100
60
50
POWER LOSS
40
10
30
20
0.1
VVIINN
=
=
10V
48V
1
1
LOAD CURRENT (mA)
10
3632 TA01b
3632fc
1


Linear Technology Electronic Components Datasheet

LTC3632 Datasheet

High Voltage 20mA Synchronous Step-Down Converter

No Preview Available !

LTC3632
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, 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
GND
7 HYST
6 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 9 7 HYST
ISET 3
GND
6 VFB
SS 4
5 RUN
DD PACKAGE
8-LEAD (3mm × 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
LTC3632EMS8E#PBF
LTC3632EMS8E#TRPBF
LTFFZ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3632IMS8E#PBF
LTC3632IMS8E#TRPBF
LTFFZ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3632EDD#PBF
LTC3632EDD#TRPBF
LFGB
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3632IDD#PBF
LTC3632IDD#TRPBF
LFGB
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/
3632fc
2


Part Number LTC3632
Description High Voltage 20mA Synchronous Step-Down Converter
Maker Linear Technology Corporation
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LTC3632 Datasheet PDF





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