LM5007_15 Datasheet, PDF (1/25 Pages) Texas Instruments – High Voltage 80-V Step Down Switching Regulator

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LM5007
SNVS252G – SEPTEMBER 2003 – REVISED NOVEMBER 2015
LM5007 High Voltage 80-V Step Down Switching Regulator
1 Features
•1 Integrated 80-V, 0.7-A N-Channel Buck Switch
• Internal HV V_CC 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
• VSSOP-8 and WSON-8 Packages
2 Applications
• Non-Isolated Buck Regulator
• Secondary High Voltage Post Regulator
• 42-V Automotive Systems
3 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, 0.7-A N-Channel Buck
Switch. The device is easy to apply and is provided in
the VSSOP-8 and the thermally enhanced WSON-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, V_CC undervoltage
lockout, gate drive undervoltage lockout, and Max
Duty Cycle limiter.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5007
VSSOP (8)
WSON (8)
3.00 mm × 3.00 mm
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
9V-75V
VIN
C_IN
R_ON
Shutdown
C_VCC
R_CL
LM5007
8 _VIN
BST ²
6 _RON
SW ¹
C_BST
L1
7 _VCC
3 _RCL
RTN
4
FB ⁵
D1
R_FB2
R_FB1
VOUT
R_r
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.