LM5007_14 Datasheet, PDF (1/18 Pages) Texas Instruments – High Voltage (80V) Step Down Switching Regulator

LM5007
www.ti.com
SNVS252E – MAY 2004 – REVISED APRIL 2011
LM5007 High Voltage (80V) Step Down Switching Regulator
Check for Samples: LM5007
FEATURES
1
•2 Integrated 80V, 0.7A N-Channel Buck Switch
• Internal HV Vcc Regulator
• No Control Loop Compensation Required
• Ultra-Fast Transient Response
• On Time Varies Inversely with Line Voltage
• Operating Frequency Nearly Constant with
Varying Line Voltage
• Adjustable Output Voltage
• Highly Efficient Operation
• Precision Reference
• Low Bias Current
• Intelligent Current Limit Protection
• Thermal Shutdown
• External Shutdown Control
TYPICAL APPLICATIONS
• Non-Isolated Buck Regulator
• Secondary High Voltage Post Regulator
• +42V Automotive Systems
DESCRIPTION
The LM5007 Step Down Switching Regulator features all of the functions needed to implement low cost, efficient,
Buck bias regulators. This high voltage regulator contains an 80 V, 0.7A N-Channel Buck Switch. The device is
easy to apply and is provided in the MSOP-8 and the thermally enhanced LLP-8 packages. The regulator is
based on a hysteretic control scheme using an on time inversely proportional to V_IN. This feature allows the
operating frequency to remain relatively constant with load and input voltage variations. The hysteretic control
requires no control loop compensation, while providing very fast load transient response. An intelligent current
limit is implemented in the LM5007 with forced off time that is inversely proportional to V_OUT. This current limiting
scheme reduces load current foldback. Additional protection features include: Thermal Shutdown, Vcc
undervoltage lockout, gate drive undervoltage lockout, and Max Duty Cycle limiter.
Package
• MSOP - 8
• LLP - 8 (4mm x 4mm)
Connection Diagram
1
SW
2
BST
3
RCL
4
RTN
8
VIN
7
VCC
6
RON
5
FB
Figure 1. 8-Lead MSOP, LLP
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 © 2004–2011, Texas Instruments Incorporated