LM5006_15 Datasheet, PDF (1/27 Pages) Texas Instruments – LM5006 80V, 600 mA Constant On-Time Buck Switching Regulator

LM5006
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SNVS646B – FEBRUARY 2011 – REVISED MARCH 2013
LM5006 80V, 600 mA Constant On-Time Buck Switching Regulator
Check for Samples: LM5006
FEATURES
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•2 Operating Input Voltage Range: 6V to 75V
• Integrated 80V, N-Channel Buck Switch
• Internal Start-Up Regulator
• No Loop Compensation Required
• Ultra-Fast Transient Response
• Operating Frequency Remains Constant with
Line and Load Variations
• Adjustable Output Voltage from 2.5V
• Precision Internal Reference, ±2.5%
• Intelligent Current Limit Reduces Foldback
• Programmable Input UV Detector with Status
Flag Output
• Gate Output Driver for Synchronous Rectifier
• Pre-Charge Switch Enables Bootstrap Gate
Drive with no Load
• Thermal Shutdown
TYPICAL APPLICATIONS
• Non-Isolated Telecommunication Buck
Regulator
• Secondary High Voltage Post Regulator
• +42V Automotive Systems
PACKAGE
• VSSOP - 10
DESCRIPTION
The LM5006 Step Down Switching Regulator features
all of the functions needed to implement a low cost,
efficient Buck bias regulator. This high voltage
regulator contains an 80V N-Channel MOSFET
Switch and a startup regulator. The device is easy to
implement and is provided in an VSSOP-10 package.
The regulator’s control scheme uses an on-time
inversely proportional to V_IN. This feature results in
the operating frequency remaining relatively constant
with line and load variations. The control scheme
requires no loop compensation, resulting in fast
transient response. An intelligent current limit is
implemented with a forced off-time which is inversely
proportional to V_OUT. This scheme ensures short
circuit control while providing minimum foldback.
Other features include: Thermal Shutdown, VCC
Under Voltage Lock-out, Max Duty Cycle Limiter, a
Pre-charge Switch, a programmable Under Voltage
Detector with a status flag output, and a gate driver
output for a synchronous rectifier.
Typical Application, Basic Step-Down Regulator
6V - 75V
Input
V_IN
VIN
GND
C1
R_T
VCC
LM5006
BST
SHUTDOWN
R_UV2
R_UV1
RT/SD
UV
R_UVO
UV STATUS
UVO
SW
LG
FB
RTN
C3
C4
L1
Q1
R_FB2
R_FB1
V_OUT
R3
C2
GND
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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.
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