0123
40
50
60
70
80
90
100
EFFICIENCY (%)
OUTPUT CURRENT (A)
9 VIn
12 Vin
20 Vin
VIN
CIN
22 PF
Enable
RFBT
See Table
CSS
0.47 PF
RFBB
See Table Co
220 PF
LMZ22003
VOUT
SS/TRK
SYNC
FB
VIN
EN
PGND
VOUT @ 3A
AGND
LMZ22003
SNVS658I –MARCH 2011–REVISED AUGUST 2015
LMZ22003 3-A SIMPLE SWITCHER
®
Power Module With 20-V Maximum Input Voltage
1 Features 2 Applications
1• Integrated Shielded Inductor • Point-of-load Conversions from 12-V Input Rail
• Simple PCB Layout • Time-Critical Projects
• Frequency Synchronization Input (650 kHz to 950 • Space Constrained and High Thermal
kHz) Requirement Applications
• Flexible Start-up Sequencing Using External Soft- • Negative Output Voltage Applications
Start, Tracking and Precision Enable (See AN-2027 SNVA425)
• Protection Against Inrush Currents and Faults 3 Description
such as Input UVLO and Output Short Circuit The LMZ22003 SIMPLE SWITCHER®power module
• Junction Temperature Range –40°C to 125°C is an easy-to-use step-down DC-DC solution capable
• Single Exposed Pad and Standard Pinout for Easy of driving up to 3-A load. The LMZ22003 is available
Mounting and Manufacturing in an innovative package that enhances thermal
• Fast Transient Response for Powering FPGAs performance and allows for hand or machine
soldering.
and ASICs
• Fully Enabled for WEBENCH®Power Designer The LMZ22003 can accept an input voltage rail
between 6 V and 20 V and can deliver an adjustable
• Pin Compatible With and highly accurate output voltage as low as 0.8 V.
LMZ23605/LMZ23603/LMZ22005 The LMZ22003 only requires two external resistors
• Electrical Specifications and three external capacitors to complete the power
– 18-W Maximum Total Output Power solution. The LMZ22003 is a reliable and robust
design with the following protection features: thermal
– Up to 3-A Output Current shutdown, programmable input undervoltage lockout,
– Input Voltage Range 6 V to 20 V output overvoltage protection, short circuit protection,
– Output Voltage Range 0.8 V to 6 V output current limit, and this device allows start-up
into a prebiased output. The sync input allows
– Efficiency up to 92% synchronization over the 650- to 950-kHz switching
• Performance Benefits frequency range.
– High Efficiency Reduces System Heat
Generation Device Information(1)(2)
– Tested To EN55022 Class B(1) PART NUMBER PACKAGE BODY SIZE (NOM)
– Low Component Count, Only 5 External LMZ22003 NDW (7) 10.16 mm × 9.85 mm
Components (1) For all available packages, see the orderable addendum at
the end of the data sheet.
– Low Output Voltage Ripple (2) Peak reflow temperature equals 245°C. See SNAA214 for
– Uses PCB as Heat Sink, No Airflow Required more details.
NOTE: EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007.
See AN-2125 SNVA473 and layout for information on
device under test. Vin = 12 V, Vo = 3.3 V, Io = 3 A
Simplified Application Schematic Efficiency 5-V Output at 25°C Ambient
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.