LMR14203 Datasheet, PDF (1/16 Pages) Texas Instruments – SIMPLE SWITCHER® 42Vin, 0.3A Step-Down Voltage Regulator in SOT-23

LMR14203
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SNVS732C – OCTOBER 2011 – REVISED APRIL 2013
LMR14203 SIMPLE SWITCHER^® 42Vin, 0.3A Step-Down Voltage Regulator in SOT-23
Check for Samples: LMR14203
FEATURES
1
•2 Input Voltage Range of 4.5V to 42V
• Output Voltage Range of 0.765V to 34V
• Output Current up to 0.3A
• 1.25 MHz Switching Frequency
• Low Shutdown Iq, 16 µA Typical
• Short Circuit Protected
• Internally Compensated
• Soft-Start Function
• Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)
• Fully Enabled for WEBENCH® Power Designer
PERFORMANCE BENEFITS
• Tight Accuracy for Powering Digital ICs
• Extremely Easy to Use
• Tiny Overall Solution Reduces System Cost
DESCRIPTION
The LMR14203 is a PWM DC/DC buck (step-down)
regulator. With a wide input range from 4.5V-42V, it is
suitable for a wide range of applications such as
power conditioning from unregulated sources. They
feature a low R_DSON (0.9Ω typical) internal switch for
maximum efficiency (85% typical). Operating
frequency is fixed at 1.25 MHz allowing the use of
small external components while still being able to
have low output voltage ripple. Soft-start can be
implemented using the shutdown pin with an external
RC circuit allowing the user to tailor the soft-start time
to a specific application.
The LMR14203 is optimized for up to 300 mA load
current.
Additional features include: thermal shutdown, V_IN
under-voltage lockout, and gate drive under-voltage
lockout. The LMR14203 is available in a low profile
SOT-6L package.
APPLICATIONS
• Point-of-Load Conversions from 5V, 12V, and
24V Rails
• Space Constrained Applications
• Battery Powered Equipment
• Industrial Distributed Power Applications
• Power Meters
• Portable Hand-Held Instruments
System Performance
Efficiency vs Load Current
V_IN = 12V, V_OUT = 1.2V and 3.3V
100
90
80
70
60
50
40
30
20
10
1.2Vout
3.3Vout
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30
LOAD CURRENT (A)
Efficiency vs Load Current
V_IN = 24V, V_OUT = 1.2V and 3.3V
100
90
80
70
60
50
40
30
20
10
1.2Vout
3.3Vout
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30
LOAD CURRENT (A)
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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