LM5019_14 Datasheet, PDF (1/25 Pages) Texas Instruments – 100 V, 100 mA Constant On-Time Synchronous Buck Regulator

LM5019
www.ti.com
SNVS788E – JANUARY 2012 – REVISED DECEMBER 2013
LM5019 100 V, 100 mA Constant On-Time Synchronous Buck Regulator
Check for Samples: LM5019
FEATURES
1
•2 Wide 7.5 V to 100 V Input Range
• Integrated 100 V, 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 1.225 V
• Precision 2% Feedback Reference
• Frequency Adjustable to 1 MHz
• Adjustable Undervoltage Lockout
• Remote Shutdown
• Thermal Shutdown
• Packages:
– WSON-8
– SO Power PAD-8
APPLICATIONS
• Smart Power Meters
• Telecommunication Systems
• Automotive Electronics
• Isolated Bias Supply
DESCRIPTION
The LM5019 is a 100 V, 100 mA synchronous step-
down 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 is available in WSON-8 and SO Power
PAD-8 plastic packages.
Typical Application
7.5V-100V
VIN
+
C_IN
R_UV2
SD
R_UV1
LM5019
7
2
V_IN
4 _RON
R_ON
3 _UVLO
BST
SW ⁸
+
C_BST
C_VCC
VCC ₆
RTN
1
FB
5
L1
R_FB2
R_FB1
VOUT
R_C
+
C_OUT
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012–2013, Texas Instruments Incorporated