Voltage Regulator. LMR14203 Datasheet

LMR14203 Datasheet PDF


Part Number

LMR14203

Description

0.3A Step-Down Voltage Regulator

Manufacture

etcTI

Total Page 19 Pages
Datasheet
Download LMR14203 Datasheet


LMR14203
LMR14203
www.ti.com
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 RDSON (0.9typical) 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, VIN
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
VIN = 12V, VOUT = 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
VIN = 24V, VOUT = 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
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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.
Copyright © 2011–2013, Texas Instruments Incorporated

LMR14203
LMR14203
SNVS732C – OCTOBER 2011 – REVISED APRIL 2013
VIN
CIN
LMR14203
VIN CB
SHDN SW
GND
FB
CBOOT
R1
R2
L1
D1
VOUT
www.ti.com
COUT
Connection Diagram
Top View
LMR14203
CB 1
6 SW
GND 2
FB 3
PIN 1 ID 5 VIN
4 SHDN
Figure 1. 6 Lead SOT Package
See Package Number DDC0006A
Pin Descriptions
Pin Name
Function
1 CB SW FET gate bias voltage. Connect CBOOT cap between CB and SW.
2
GND
Ground connection.
3
FB
Feedback pin: Set feedback voltage divider ratio with VOUT = VFB (1+(R1/R2)). Resistors should be
in the 100-10K range to avoid input bias errors.
4
SHDN
Logic level shutdown input. Pull to GND to disable the device and pull high to enable the device. If
this function is not used tie to VIN or leave open.
5 VIN Power input voltage pin: 4.5V to 42V normal operating range.
6 SW Power FET output: Connect to inductor, diode, and CBOOT cap.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2 Submit Documentation Feedback
Product Folder Links: LMR14203
Copyright © 2011–2013, Texas Instruments Incorporated





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