LM5018_15 Datasheet, PDF (1/32 Pages) Texas Instruments – 100-V, 300-mA Constant On-Time Synchronous Buck Regulator

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LM5018
SNVS787G – JANUARY 2012 – REVISED OCTOBER 2015
LM5018 100-V, 300-mA Constant On-Time Synchronous Buck Regulator
1 Features
•1 Wide 7.5- to 100-V Input Range
• Integrated 300-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:
– WSON-8
– SO PowerPAD™-8
2 Applications
• Smart Power Meters
• Telecommunication Systems
• Automotive Electronics
• Isolated Bias Supply
3 Description
The LM5018 is a 100-V, 300-mA synchronous step-
down regulator with integrated high-side and low-side
MOSFETs. The constant-on-time (COT) control
scheme employed in the LM5018 device 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 LM5018 device is available in WSON-8 and SO
PowerPAD-8 plastic packages.
PART NUMBER
LM5018
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
SO PowerPAD (8)
4.89 mm × 3.90 mm
WSON (8)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
7.5 V - 100 V
VIN
+
C _IN
R_UV2
SD
R_UV1
LM5018
2
V_IN
4
RON
R_ON
3
UVLO
7
BST
8
SW
+
C_BST
C_VCC
VCC
6
FB
5
RTN
1
L1
R_FB2
R_FB1
VOUT
R_C
+
C_OUT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.