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LM3489 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części LM3489
Szczegółowy opis  Hysteretic PFET Buck Controller With Enable Pin
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

LM3489 Arkusz danych(HTML) 1 Page - Texas Instruments

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ISENSE
ADJ
VIN
PGATE
FB
EN
LM3489
GND
PGND
1
2
3
4
5
6
7
8
+
+
Q1
VIN
VOUT
CIN1
COUT
D1
L
RADJ
RIS
CADJ
R1
R2
Cff
CIN2
LM3489
LM3489-Q1
www.ti.com
SNVS443B – MAY 2006 – REVISED FEBRUARY 2013
Hysteretic PFET Buck Controller With Enable Pin
Check for Samples: LM3489, LM3489-Q1
1
FEATURES
DESCRIPTION
The LM3489 is a high efficiency PFET switching
2
Easy to use control methodology
regulator controller that can be used to quickly and
No control loop compensation required
easily develop a small, cost effective, switching buck
Wide 4.5V to 35V input range
regulator for a wide range of applications. The
hysteretic control architecture provides for simple
1.239V to VIN adjustable output range
design without any control loop stability concerns
High efficiency 93%
using a wide variety of external components. The
±1.3% (±2% over temp) internal reference
PFET architecture also allows for low component
count as well as ultra-low dropout, 100% duty cycle
100% duty cycle operation
operation. Another benefit is high efficiency operation
Maximum operation frequency > 1MHz
at light loads without an increase in output ripple. A
Current limit protection
dedicated Enable Pin provides a shutdown mode
drawing
only
7µA.
Leaving
the
Enable
Pin
Dedicated enable pin (on if unconnected)
unconnected defaults to on.
Shutdown mode draws only 7µA supply
current
Current limit protection can be implemented by
measuring the voltage across the PFET’s RDS(ON),
VSSOP-8
thus eliminating the need for a sense resistor. A
LM3489 is AEC-Q100 Grade 1 qualified
sense resistor may be used to improve current limit
accuracy if desired. The cycle-by-cycle current limit
APPLICATIONS
can be adjusted with a single resistor, ensuring safe
operation over a range of output currents.
Set-Top Box
DSL or Cable Modem
PC/IA
Auto PC
TFT Monitor
Battery Powered Portable Applications
Distributed Power Systems
Always On Power
High Power LED Driver
Automotive
TYPICAL APPLICATION CIRCUIT
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 © 2006–2013, 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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