LM5019 Datasheet, PDF (1/17 Pages) Texas Instruments – 100V, 100mA Constant On-Time Synchronous Buck Regulator

LM5019
February 6, 2012
100V, 100mA Constant On-Time Synchronous Buck
Regulator
General Description
The LM5019 is a 100V, 100mA synchronous step-down reg-
ulator with integrated high side and low side MOSFETs. The
constant-on-time (COT) control scheme employed in the
LM5019 requires no loop compensation, provides excellent
transient response, and enables very low step-down ratios.
The on-time varies inversely with the input voltage resulting
in nearly constant frequency over the input voltage range. A
high voltage startup regulator provides bias power for internal
operation of the IC and for integrated gate drivers.
A peak current limit circuit protects against overload condi-
tions. The undervoltage lockout (UVLO) circuit allows the
input undervoltage threshold and hysteresis to be indepen-
dently programmed. Other protection features include ther-
mal shutdown and bias supply undervoltage lockout.
The LM5019 is available in LLP-8 and PSOP-8 plastic pack-
ages.
Features
■ ^{Wide 9V to 100V Input Range}
■ ^{Integrated 100V, High and Low Side Switches}
■ ^{No Schottky Required}
■ ^{Constant On-Time Control}
■ ^{No Loop Compensation Required}
■ ^{Ultra-Fast Transient Response}
■ ^{Nearly Constant Operating Frequency}
■ ^{Intelligent Peak Current Limit}
■ ^{Adjustable Output Voltage from 1.225V}
■ ^{Precision 2% Feedback Reference}
■ ^{Frequency Adjustable to 1MHz}
■ ^{Adjustable Undervoltage Lockout}
■ ^{Remote Shutdown}
■ ^{Thermal Shutdown}
Packages
■ ^LLP-8
■ ^PSOP-8
Applications
■ ^{Smart Power Meters}
■ ^{Telecommunication Systems}
■ ^{Automotive Electronics}
■ ^{Isolated Bias Supply}
Typical Application
FIGURE 1.
© 2012 Texas Instruments Incorporated 301817 SNVS788B
30181701
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