1 Features
1• AEC-Q100-Qualified for Automotive Applications:
– Temperature grade 1: –40°C to +125°C, TA
• 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 20-Pin HTSSOP Package
• Create a Custom Design using the LM3102-Q1
with the WEBENCH® Power Designer

2 Applications
• Automotive Body Electronics
• Automotive Lighting
• Automotive Infotainment and Telematics
• General 12-V and 24-V Automotive DC/DC
Conversion

3 Description
The LM3102-Q1 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-Q1 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-Q1 is available in the thermally enhanced
20-pin HTSSOP package.