LTC3632 LINER [Linear Technology], LTC3632 Datasheet

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LTC3632

Manufacturer Part Number
LTC3632
Description
High Effi ciency, High Voltage 20mA Synchronous Step-Down Converter
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
5V TO 50V
Wide Input Voltage Range: Operation from
4.5V to 50V
Overvoltage Lockout Provides Protection Up to 60V
Internal High Side and Low Side Power Switches
No Compensation Required
20mA Output Current
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12μA
Wide Output Voltage Range: 0.8V to V
0.8V ±1% Feedback Voltage Reference
Adjustable Peak Current Limit
Internal and External Soft-Start
Precise RUN Pin Threshold with Adjustable
Hysteresis
Few External Components Required
Low Profi le (0.75mm) 3mm × 3mm DFN and
Thermally Enhanced MS8E Packages
4mA to 20mA Current Loops
Industrial Control Supplies
Distributed Power Systems
Portable Instruments
Battery-Operated Devices
Automotive Power Systems
V
IN
1μF
5V, 20mA Step-Down Converter
V
RUN
HYST
I
SET
IN
LTC3632
GND
SW
V
SS
FB
1mH
1.47M
280k
3632 TA01a
IN
10μF
V
5V
20mA
OUT
High Effi ciency, High Voltage
DESCRIPTION
The LTC
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 effi ciency 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
effi ciency 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.
®
3632 is a high effi ciency, high voltage step-down
Effi ciency and Power Loss vs Load Current
100
90
60
50
40
30
20
80
70
Step-Down Converter
0.1
20mA Synchronous
LOAD CURRENT (mA)
POWER LOSS
EFFICIENCY
1
V
V
IN
IN
10
3632 TA01b
LTC3632
= 10V
= 48V
1000
100
10
1
3632fb
1
®

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