LMZ12001_15 Datasheet, PDF (1/31 Pages) Texas Instruments – LMZ12001 1-A SIMPLE SWITCHER® Power Module With 20-V Maximum Input Voltage

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LMZ12001
SNVS651H – JANUARY 2010 – REVISED AUGUST 2015
LMZ12001 1-A SIMPLE SWITCHER^® Power Module With 20-V Maximum Input Voltage
1 Features
•1 Integrated Shielded Inductor
• Simple PCB Layout
• Flexible Start-up Sequencing Using External Soft-
start Capacitor and Precision Enable
• Protection Against Inrush Currents and Faults
Such as Input UVLO and Output Short Circuit
• Junction Temperature Range –40°C to 125°C
• Single Exposed Pad and Standard Pinout for Easy
Mounting and Manufacturing
• Fast Transient Response for FPGAs and ASICs
• Low Output Voltage Ripple
• Pin-to-Pin Compatible With Family Devices:
– LMZ14203/2/1 (42-V Maximum 3 A, 2 A, 1 A)
– LMZ12003/2/1 (20-V Maximum 3 A, 2 A, 1 A)
• Fully WEBENCH^® Power Designer Enabled
• Electrical Specifications
– 6-W Maximum Total Power Output
– Up to 1-A Output Current
– Input Voltage Range 4.5 V to 20 V
– Output Voltage Range 0.8 V to 6 V
– Efficiency up to 92%
• Performance Benefits
– Operates at High Ambient Temperature with
no Thermal Derating
– High Efficiency Reduces System Heat
Generation
– Low Radiated Emissions (EMI) Tested to
EN55022 Class B Standard
– Low External Component Count
2 Applications
• Point-of-load Conversions from 5-V and 12-V
Input Rail
• Time-Critical Projects
• Space Constrained High Thermal Requirement
Applications
• Negative Output Voltage Applications
(See AN-2027 SNVA425)
3 Description
The LMZ12001 SIMPLE SWITCHER^® power module
is an easy-to-use step-down DC-DC solution capable
of driving up to 1-A load with exceptional power
conversion efficiency, line and load regulation, and
output accuracy. The LMZ12001 is available in an
innovative package that enhances thermal
performance and allows for hand or machine
soldering.
The LMZ12001 can accept an input voltage rail
between 4.5 V and 20 V and can deliver an
adjustable and highly accurate output voltage as low
as 0.8 V. The LMZ12001 only requires three external
resistors and four external capacitors to complete the
power solution. The LMZ12001 is a reliable and
robust design with the following protection features:
thermal shutdown, input undervoltage lockout, output
overvoltage protection, short circuit protection, output
current limit, and the device 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)
LMZ12001
NDW (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
LMZ12001
VIN
RON
See Table
Enable
CIN
10 2F
CSS
0.022 2F
CFF _{0.022 2F}
RFBT
See Table
RFBB
See Table
VOUT @ 1A
100 2F
Efficiency 5-V Input at 25°C
100
95
90
1.8
85
1.5
1.2
80
0.8
75
70
65
60
55
25°C
500
0.2
0.4
0.6
0.8
1
OUTPUT CURRENT (A)
1
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.