LM5010A Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – High Voltage 1A Step Down Switching Regulator

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LM5010A
LM5010A-Q1
SNVS376E – OCTOBER 2005 – REVISED FEBRUARY 2013
High-Voltage 1-A Step-Down Switching Regulator
Check for Samples: LM5010A, LM5010A-Q1
FEATURES
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•2 Wide 6V to 75V Input Voltage Range
• Valley Current Limiting At 1.25A
• Programmable Switching Frequency Up To 1
MHz
• Integrated 80V N-Channel Buck Switch
• Integrated High Voltage Bias Regulator
• No Loop Compensation Required
• Ultra-Fast Transient Response
• Nearly Constant Operating Frequency With
Line and Load Variations
• Adjustable Output Voltage
• 2.5V, ±2% Feedback Reference
• Programmable Soft-Start
• Thermal Shutdown
• LM5010AQ is AEC-Q100 Grade 1 and 0
qualified
• Packages
– WSON-10 (4 mm x 4 mm)
– HTSSOP-14
– Both Packages Have Exposed Thermal Pad
For Improved Heat Dissipation
APPLICATIONS
• Non-Isolated Telecommunications Regulator
• Secondary Side Post Regulator
• Automotive Electronics
DESCRIPTION
The LM5010A Step-Down Switching Regulator is an
enhanced version of the LM5010 with the input
operating range extended to 6V minimum. The
LM5010A features all the functions needed to
implement a low cost, efficient, buck regulator
capable of supplying in excess of 1A load current.
This high voltage regulator integrates an N-Channel
Buck Switch, and is available in thermally enhanced
WSON-10 and HTSSOP-14 packages. The constant
on-time regulation scheme requires no loop
compensation resulting in fast load transient
response and simplified circuit implementation. The
operating frequency remains constant with line and
load variations due to the inverse relationship
between the input voltage and the on-time. The valley
current limit detection is set at 1.25A. Additional
features include: VCC under-voltage lock-out, thermal
shutdown, gate drive under-voltage lock-out, and
maximum duty cycle limiter.
Basic Step-Down Regulator
6V - 75V
Input
C1
SHUTDOWN
VIN
VCC
R_ON
LM5010A
BST
RON/SD
SW
SS
ISEN
C6
FB
RTN
SGND
C3
C4
L1
D1
R1
R2
V_OUT
R3
C2
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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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