Buck Regulator - Texas Instruments
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Reference Design
LM5019
SNVS788G – JANUARY 2012 – REVISED NOVEMBER 2017
LM5019 100-V, 100-mA Constant On-Time Synchronous Buck Regulator
1 Features
•1 Wide 7.
5-V to 100-V Input Range • Integrated 100-mA High-Side 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.
225 V • Precision 2% Feedback Reference • Frequency Adjustable to 1 MHz • Adjustable Undervoltage Lockout • Remote Shutdown • Thermal Shutdown • Packages:
– 8-Pin WSON – 8-Pin SO PowerPAD • Create a Custom Design Using the LM5019 With the WEBENCH® Power Designer
2 Applications
• Smart Power Meters • Telecommunication Systems • Automotive Electronics • Isolated Bias Supply
3 Description
The LM5019 is a 100-V, 100-mA synchronous stepdown regulator 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 conditions.
The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed.
Other protection features include thermal shutdown and bias supply undervoltage lockout.
The LM5019 device is available in WSON-8 and SO PowerPAD-8 plastic packages.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5019
SO PowerPAD (8) WSON (8)
4.
89 mm × 3.
90 mm 4.
00 mm × 4.
00 mm
(1) For all available packages, see the orderable...
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