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LM3481QMM 数据表(PDF) 1 Page - Texas Instruments

部件名 LM3481QMM
功能描述  LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM3481QMM 数据表(HTML) 1 Page - Texas Instruments

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LM3481
VIN
ISEN
COMP
FB
AGND
UVLO
VCC
DR
PGND
FA/SYNC/SD
+
+
VIN = 3.0V to 48V
VOUT = 5V, 1A
CIN
COUT
RSEN
L1
L2
CBYP
RFA
CSEN
Q1
CS
RC
CC
RF1
RF2
R7
R8
D1
LM3481
www.ti.com
SNVS346E – NOVEMBER 2007 – REVISED APRIL 2012
LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching
Regulators
Check for Samples: LM3481
1
FEATURES
KEY SPECIFICATIONS
2
LM3481QMM in the VSSOP-10 Package are
Wide Supply Voltage Range of 2.97V to 48V
Automotive Grade Products that are AEC-Q100
100 kHz to 1 MHz Adjustable and
Grade 1 Qualified (-40°C to +125°C Operating
Synchronizable Clock Frequency
Junction Temperature)
±1.5% (Over Temperature) Internal Reference
10-Lead VSSOP Package
10 µA Shutdown Current (Over Temperature)
Internal Push-Pull Driver with 1A Peak Current
Capability
DESCRIPTION
Current Limit and Thermal Shutdown
The LM3481 is a versatile Low-Side N-FET high
performance controller for switching regulators. It is
Frequency Compensation Optimized with a
suitable for use in topologies requiring a low-side
Capacitor and a Resistor
FET, such as boost, flyback, SEPIC, etc. The
Internal Softstart
LM3481 can be operated at extremely high switching
Current Mode Operation
frequencies in order to reduce the overall solution
size. The switching frequency of the LM3481 can be
Adjustable Undervoltage Lockout with
adjusted to any value between 100 kHz and 1 MHz
Hysteresis
by using a single external resistor or by synchronizing
Pulse Skipping at Light Loads
it to an external clock. Current mode control provides
superior bandwidth and transient response in addition
APPLICATIONS
to cycle-by-cycle current limiting. Current limit can be
programmed with a single external resistor.
Distributed Power Systems
The LM3481 has built in protection features such as
Notebook, PDA, Digital Camera, and other
thermal shutdown, short-circuit protection and over
Portable Applications
voltage protection. Power saving shutdown mode
Offline Power Supplies
reduces the total supply current to 5µA and allows
Set-Top Boxes
power supply sequencing. Internal soft-start limits the
inrush current at start-up.
TYPICAL APPLICATION CIRCUIT
Figure 1. Typical SEPIC Converter
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 © 2007–2012, 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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