1 Features
1• 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
• Prebias Start-Up
• Ultra-Fast Transient Response
• Programmable Soft-Start
• Programmable Switching Frequency up to 1 MHz
• Valley Current Limit
• Output Overvoltage Protection
• Precision Internal Reference for an Adjustable
Output Voltage Down to 0.8 V
• Thermal Shutdown
• Key Specifications
– Input Voltage Range 4.5 V to 42 V
– 2.5-A Output Current
– 0.8 V, ±1.5% Reference
– Integrated Dual N-Channel Main and
Synchronous MOSFETs
– Thermally Enhanced HTSSOP-20 Package

2 Applications
• 5-VDC, 12-VDC, 24-VDC, 12-VAC, and 24-VAC
Systems
• Embedded Systems and Industrial Control
• Automotive Telematics and Body Electronics
• Point of Load Regulators
• Storage Systems
• Broadband Infrastructure
• Direct Conversion from 2-, 3-, and 4-Cell Lithium
Batteries Systems

3 Description
The LM3102 Synchronously Rectified Buck Converter
features all required functions to implement a highly
efficient and cost-effective buck regulator. The device
can supply 2.5 A to loads with an output voltage as
low as 0.8 V. 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
LM3102 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. The device 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 VCC undervoltage
lockout (UVLO), output overvoltage protection,
thermal shutdown, and gate drive UVLO. The
LM3102 is available in the thermally enhanced
HTSSOP-20 package, and LM3102 is also available
in a DSBGA low-profile chip-scale package with
reduced output current.