LM3103_14 Datasheet, PDF (1/20 Pages) Texas Instruments – SIMPLE SWITCHER® Synchronous 1MHz 0.75A Step-Down Voltage Regulator

LM3103
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SNVS523E – SEPTEMBER 2007 – REVISED NOVEMBER 2009
LM3103 SIMPLE SWITCHER® Synchronous 1MHz 0.75A
Step-Down Voltage Regulator
Check for Samples: LM3103
FEATURES
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•2 Low Component Count and Small Solution
Size
• Stable with Ceramic and Other Low ESR
Capacitors
• No Loop Compensation Required
• High Efficiency at a Light Load by DCM
Operation
• Pre-bias Startup
• Ultra-Fast Transient Response
• Programmable Soft-Start
• Programmable Switching Frequency up to 1
MHz
• Valley Current Limit
• Thermal Shutdown
• Output Over-Voltage Protection
• Precision Internal Reference for an Adjustable
Output Voltage Down to 0.6V
TYPICAL APPLICATIONS
• 5VDC, 12VDC, 24VDC, 12VAC, and 24VAC
Systems
• Embedded Systems
• Industrial Control
• Automotive Telematics and Body Electronics
• Point of Load Regulators
• Storage Systems
• Broadband Infrastructure
• Direct Conversion from 2/3/4 Cell Lithium
Batteries Systems
KEY SPECIFICATIONS
• Input Voltage Range 4.5 V to 42 V
• 0.75 A Output Current
• 0.6V, ±2% Reference
• Integrated Dual N-Channel Main and
Synchronous MOSFETs
• Thermally Enhanced HTSSOP-16 Package
DESCRIPTION
The LM3103 Synchronously Rectified Buck Converter
features all required functions to implement a highly
efficient and cost effective buck regulator. It is
capable of supplying 0.75A to loads with an output
voltage as low as 0.6V. Dual N-Channel synchronous
MOSFET switches allow a low component count, thus
reducing complexity and minimizing board size.
Different from most other COT regulators, the
LM3103 does not rely on output capacitor ESR for
stability, and is designed to work exceptionally well
with ceramic and other very low ESR output
capacitors. It requires no loop compensation, results
in a fast load transient response and simple circuit
implementation. The operating frequency remains
nearly constant with line variations due to the inverse
relationship between the input voltage and the on-
time. The operating frequency can be externally
programmed up to 1 MHz. Protection features include
V_CC under-voltage lock-out, output over-voltage
protection, thermal shutdown, and gate drive under-
voltage lock-out. The LM3103 is available in the
thermally enhanced HTSSOP-16 package.
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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.
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