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SM74304 データシート(PDF) 1 Page - Texas Instruments

部品番号 SM74304
部品情報  SM74304 High Voltage (80V) Step Down Switching Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

SM74304 データシート(HTML) 1 Page - Texas Instruments

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SW
BST
RCL
FB
RTN
RON
VCC
VIN
SM74304
www.ti.com
SNVS720A – OCTOBER 2011 – REVISED APRIL 2013
SM74304 High Voltage (80V) Step Down Switching Regulator
Check for Samples: SM74304
1
FEATURES
PACKAGE
2
Integrated 80V, 0.7A N-Channel Buck Switch
VSSOP-8
Internal HV Vcc Regulator
WSON-8 (4mm x 4mm)
No Control Loop Compensation Required
DESCRIPTION
Ultra-Fast Transient Response
The
SM74304
Step
Down
Switching
Regulator
On Time Varies Inversely with Line Voltage
features all of the functions needed to implement low
Operating Frequency Nearly Constant with
cost, efficient, Buck bias regulators. This high voltage
Varying Line Voltage
regulator contains an 80 V, 0.7A N-Channel Buck
Switch. The device is easy to apply and is provided in
Adjustable Output Voltage
the VSSOP-8 and the thermally enhanced WSON-8
Highly Efficient Operation
packages. The regulator is based on a hysteretic
Precision Reference
control
scheme
using
an
on
time
inversely
proportional to VIN. This feature allows the operating
Low Bias Current
frequency to remain relatively constant with load and
Intelligent Current Limit Protection
input
voltage
variations.
The
hysteretic
control
Thermal Shutdown
requires
no
control
loop
compensation,
while
providing very fast load transient response. An
External Shutdown Control
intelligent
current
limit
is
implemented
in
the
SM74304 with forced off time that is inversely
TYPICAL APPLICATIONS
proportional to VOUT. This current limiting scheme
Non-Isolated Buck Regulator
reduces load current foldback. Additional protection
features
include:
Thermal
Shutdown,
Vcc
Secondary High Voltage Post Regulator
undervoltage
lockout,
gate
drive
undervoltage
Photovoltaic Systems
lockout, and Max Duty Cycle limiter.
Connection Diagram
Figure 1. 8-Lead VSSOP, WSON
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.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2011–2013, Texas Instruments Incorporated
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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