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Linear Technology Electronic Components Datasheet

LTC3642 Datasheet

High Voltage 50mA Synchronous Step-Down Converter

No Preview Available !

FEATURES
n Wide Input Voltage Range: 4.5V to 45V
n Tolerant of 60V Input Transients
n Internal High Side and Low Side Power Switches
n No Compensation Required
n 50mA Output Current
n Low Dropout Operation: 100% Duty Cycle
n Low Quiescent Current: 12µA
n 0.8V 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
LTC3642
High Efficiency, High Voltage
50mA Synchronous
Step-Down Converter
DESCRIPTION
The LTC®3642 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 LTC3642 can supply up to 50mA load current and
features a programmable peak current limit that provides
a simple method for optimizing efficiency in lower current
applications. The LTC3642’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 LTC3642 is a robust converter suited for
regulating a wide variety of power sources. Additionally,
the LTC3642 includes a precise run threshold and soft‑start
feature to guarantee that the power system start-up is
well-controlled in any environment.
The LTC3642 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
5V, 50mA Step-Down Converter
VIN
5V TO 45V
1µF
VIN SW
LTC3642-5
RUN
HYST
VOUT
SS
ISET
GND
150µH
VOUT
5V
10µF 50mA
3642 TA01a
Efficiency and Power Loss vs Load Current
100 VIN = 10V
95
90
EFFICIENCY
100
85
80 POWER LOSS
10
75 1
70
65
0.1
1 10
LOAD CURRENT (mA)
0.1
100
3642 TA01b
3642fc
1


Linear Technology Electronic Components Datasheet

LTC3642 Datasheet

High Voltage 50mA Synchronous Step-Down Converter

No Preview Available !

LTC3642
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
HYST, ISET, SS Voltages................................ –0.3V to 6V
VFB................................................................ –0.3V to 6V
VOUT (Fixed Output Versions)........................ –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 9 7 HYST
ISET 3
GND
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 9 7 HYST
ISET 3
GND
6 VOUT/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
LTC3642EMS8E#PBF
LTC3642EMS8E#TRPBF
LTDTH
8-Lead Plastic MSOP
–40°C to 125°C
LTC3642EMS8E-3.3#PBF
LTC3642EMS8E-3.3#TRPBF
LTDYN
8-Lead Plastic MSOP
–40°C to 125°C
LTC3642EMS8E-5#PBF
LTC3642EMS8E-5#TRPBF
LTDYQ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3642IMS8E#PBF
LTC3642IMS8E#TRPBF
LTDTH
8-Lead Plastic MSOP
–40°C to 125°C
LTC3642IMS8E-3.3#PBF
LTC3642IMS8E-3.3#TRPBF
LTDYN
8-Lead Plastic MSOP
–40°C to 125°C
LTC3642IMS8E-5#PBF
LTC3642IMS8E-5#TRPBF
LTDYQ
8-Lead Plastic MSOP
–40°C to 125°C
LTC3642EDD#PBF
LTC3642EDD#TRPBF
LDTJ
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3642EDD-3.3#PBF
LTC3642EDD-3.3#TRPBF
LDYM
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3642EDD-5#PBF
LTC3642EDD-5#TRPBF
LDYP
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3642IDD#PBF
LTC3642IDD#TRPBF
LDTJ
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3642IDD-3.3#PBF
LTC3642IDD-3.3#TRPBF
LDYM
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3642IDD-5#PBF
LTC3642IDD-5#TRPBF
LDYP
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/
3642fc
2


Part Number LTC3642
Description High Voltage 50mA Synchronous Step-Down Converter
Maker Linear Technology
Total Page 22 Pages
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