1 Features
1• LM25011-Q1 is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified (–40°C to +125°C
Operating Junction Temperature)
• LM25011A Allows Low-Dropout Operation at High
Switching Frequency
• Input Operating Voltage Range: 6 V to 42 V
• Absolute Maximum Input Rating: 45 V
• Integrated 2-A N-Channel Buck Switch
• Adjustable Current Limit Allows for Smaller
Inductor
• Adjustable Output Voltage from 2.51 V
• Minimum Ripple Voltage at VOUT
• Power Good Output
• Switching Frequency Adjustable to 2 MHz
• COT Topology Features:
– Switching Frequency Remains Nearly
Constant with Load Current and Input Voltage
Variations
– Ultra-Fast Transient Response
– No Loop Compensation Required
– Stable Operation with Ceramic Output
Capacitors
– Allows for Smaller Output Capacitor and
Current Sense Resistor
• Adjustable Soft-Start Timing
• Thermal Shutdown
• Precision 2% Feedback Reference
• Package: 10-Pin, HVSSOP
• Create a Custom Design Using the LM25011
Family with the WEBENCH Power Designer

2 Applications
• Automotive Safety
• Infotainment
• Telecommunication
• Front Camera

3 Description
The LM25011 constant on-time step-down switching
regulator features all the functions needed to
implement a low-cost, efficient, buck bias regulator
capable of supplying up to 2 A of load current. This
high-voltage regulator contains an N-Channel Buck
switch, a startup regulator, current limit detection, and
internal ripple control. The constant on-time
regulation principle requires no loop compensation,
results in fast load transient response, and simplifies
circuit implementation. The operating frequency
remains constant with line and load. The adjustable
valley current limit detection results in a smooth
transition from constant voltage to constant current
mode when current limit is reached, without the use
of current limit foldback. The PGD output indicates
the output voltage has increased to within 5% of the
expected regulation value. Additional features
include: Low output ripple, VIN under-voltage lockout,
adjustable soft-start timing, thermal shutdown,
gate drive pre-charge, gate drive under-voltage lockout,
and maximum duty cycle limit.
The LM25011A has a shorter minimum off-time than
the LM25011, which allows for higher frequency
operation at low input voltages.