LMZ14203_15 Datasheet, PDF (1/29 Pages) Texas Instruments – SIMPLE SWITCHER 6V to 42V, 3A Power Module in Leaded SMT-TO Package

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LMZ14203
SNVS632R – DECEMBER 2009 – REVISED OCTOBER 2015
LMZ14203 SIMPLE SWITCHER^® 6V to 42V, 3A Power Module in Leaded SMT-TO Package
1 Features
•1 Integrated Shielded Inductor
• Simple PCB Layout
• Flexible Start-Up Sequencing Using External Soft-
Start and Precision Enable
• Protection Against Inrush Currents and Faults
Such as Input UVLO and Output Short Circuit
• –40°C to 125°C Junction Temperature Range
• Single Exposed Pad and Standard Pinout for Easy
Mounting and Manufacturing
• Fast Transient Response for Powering FPGAs
and ASICs
• Low Output Voltage Ripple
• Pin-to-Pin Compatible Family:
– LMZ1420x (42 V Maximum 3 A, 2 A, 1 A)
– LMZ1200x (20 V Maximum 3 A, 2 A, 1 A)
• Fully Enabled for WEBENCH^® Power Designer
• Electrical Specifications
– 18-W Maximum Total Output Power
– Up to 3-A Output Current
– Input Voltage Range 6 V to 42 V
– Output Voltage Range 0.8 V to 6 V
– Efficiency up to 90%
• Performance Benefits
– Operates at High Ambient Temperature With
No Thermal Derating
– High Efficiency Reduces System Heat
Generation
– Low Radiated Emissions (Electromagnetic
Interference [EMI]) Tested With EN55022
Class B Standard
– Passes 10-V/m Radiated Immunity EMI Test
Standard EN61000 4-3
2 Applications
• Point of Load Conversions From 12-V and 24-V
Input Rail
• Time-Critical Projects
• Space Constrained and High Thermal
Requirement Applications
• Negative Output Voltage Applications
(See AN-2027 SNVA425)
3 Description
The LMZ14203 SIMPLE SWITCHER power module
is an easy-to-use step-down DC-DC solution that can
drive up to 3-A load with exceptional power
conversion efficiency, line and load regulation, and
output accuracy. The LMZ14203 is available in an
innovative package that enhances thermal
performance and allows for hand or machine
soldering.
The LMZ14203 can accept an input voltage rail
between 6 V and 42 V and deliver an adjustable and
highly accurate output voltage as low as 0.8 V. The
LMZ14203 only requires three external resistors and
four external capacitors to complete the power
solution. The LMZ14203 is a reliable and robust
design with the following protection features: thermal
shutdown, input UVLO, output overvoltage protection,
short-circuit protection, output current limit, and
allows start-up into a prebiased output. A single
resistor adjusts the switching frequency up to 1 MHz.
Device Information⁽¹⁾⁽²⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMZ14203
TO-PMOD (7) 10.16 mm × 9.85 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
(2) Peak reflow temperature equals 245°C. See SNAA214 for
more details.
Simplified Application Schematic
LMZ14203
VIN
RON
Enable
CIN
CSS
CFF
RFBT
RFBB
VOUT
COUT
1
Efficiency 12-V Input at 25°C
100
95
90
5.0
85
3.3
2.5
80
1.8
75
1.5
1.2
70
65
0.8
60
55
25°C
50
0 0.5 1 1.5 2 2.5 3
OUTPUT CURRENT (A)
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.