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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.