LMZ22008_15 Datasheet, PDF (1/36 Pages) Texas Instruments – 8A SIMPLE SWITCHER Power Module With 20-V Maximum Input Voltage and Current Sharing

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LMZ22008
SNVS712H – FEBRUARY 2010 – REVISED AUGUST 2015
LMZ22008 8-A SIMPLE SWITCHER^® Power Module With 20-V Maximum Input Voltage and
Current Sharing
1 Features
•1 Integrated Shielded Inductor
• Simple PCB Layout
• Frequency Synchronization Input (350 kHz to 600
kHz)
• Current Sharing Capability
• Flexible Start-up Sequencing Using External
Soft-Start, Tracking 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
• Fully Enabled for WEBENCH^® Power Designer
• Pin Compatible With LMZ22010/06,
LMZ12010/08/06, LMZ23610/08/06, and
LMZ13610/08/06
• Electrical Specifications
– 40-W Maximum Total Output Power
– Up to 8-A Output Current
– Input Voltage Range 6 V to 20 V
– Output Voltage Range 0.8 V to 6 V
– Efficiency up to 92%
• Performance Benefits
– High Efficiency Reduces System Heat
Generation
– Low Radiated Emissions (EMI) Tested to
EN55022
– Only 7 External Components
– Low Output Voltage Ripple
– No External Heat Sink Required
– Simple Current Sharing for Higher Current
Applications
NOTE: EN 55022:2006, +A1:2007, FCC Part 15 Subpart B,
tested on Evaluation Board with EMI configuration.
2 Applications
• Point-of-load Conversions from 12-V Input Rail
• Time-Critical Projects
• Space Constrained and High Thermal
Requirement Applications
• Negative Output Voltage Applications
See AN-2027 SNVA425
3 Description
The LMZ22008 SIMPLE SWITCHER^® power module
is an easy-to-use step-down DC-DC solution capable
of driving up to 8-A load. The LMZ22008 is available
in an innovative package that enhances thermal
performance and allows for hand or machine
soldering.
The LMZ22008 can accept an input voltage rail
between 6 V and 20 V and deliver an adjustable and
highly accurate output voltage as low as 0.8 V. The
LMZ22008 only requires two external resistors and
external capacitors to complete the power solution.
The LMZ22008 is a reliable and robust design with
the following protection features: thermal shutdown,
programmable input undervoltage lockout, output
overvoltage protection, short circuit protection, output
current limit, and allows start-up into a prebiased
output.
The sync input allows synchronization over the 314-
to 600-kHz switching frequency range and up to 6
modules can be connected in parallel for higher load
currents.
Device Information⁽¹⁾⁽²⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMZ22008
NDY (11)
15.00 mm × 15.00 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
LMZ22008
VIN
VOUT
Clock
Enable
CIN
3 x 10 2F
CSS
0.47 2F
(OPT)
Share
CFF 4.7 nF (OPT)
RFBT
See Table
RFBB
See Table
COUT
2 x 330 2F
1
Efficiency 3.3-V Output at 25°C
100
90
80
70
60
50
40
0
6Vin
8Vin
10Vin
12Vin
16Vin
20Vin
2
4
6
8
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.