LM3489EVAL National Semiconductor, LM3489EVAL Datasheet

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LM3489EVAL

Manufacturer Part Number
LM3489EVAL
Description
BOARD EVALUATION LM3489
Manufacturer
National Semiconductor
Datasheets
1.LM3489MMNOPB.pdf (16 pages)
2.LM3489EVAL.pdf (7 pages)

Specifications of LM3489EVAL

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
3.3V
Current - Output
500mA
Voltage - Input
7 ~ 28V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
LM3489
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
Frequency - Switching
-
© 2006 National Semiconductor Corporation
LM3489 Demonstration
Board
Introduction
The LM3489 is a high efficiency PFET switching regulator
controller that can be used to quickly and easily develop a
small, cost effective, switching buck regulator for a wide
range of applications. The hysteretic control architecture
provides for simple design without any control loop stability
concerns using a wide variety of external components. The
PFET architecture also allows for low component count as
well as ultra-low dropout, and 100% duty cycle operation.
Another benefit is high efficiency operation at light loads
without an increase in output ripple. A dedicated Enable Pin
(Enabled if left unconnected) provides a shutdown mode
drawing only 7 µA.
Evaluation Board Schematic
Bill of Materials
COUT
Label
CADJ
CIN1
CIN2
M1
Cff
D1
R1
L
Description
Tantalum Capacitor 22µF 35V EEJL1VD226R
Tantalum Capacitor 22µF 35V 293D226X0035E
0603 Ceramic Chip Capacitor 0.1µF 50V ECJ1VB1H104K
Low ESR Capacitor, POSCAP 100µF 6.3V 6TPC100M
0603 Ceramic Chip 1nF 50V ECJ1VB1H102K
0603 Ceramic Chip 1nF 50V VJ0805A102KXAA
0805 Ceramic Chip 100pF 50V ECJ1VC1H101J
0805 Ceramic Chip 100pF 50V VJ0805A101KXAA
Schottky Diode 1A 40V MBRS140T3
Schottky Diode 1A 40V CMSH1-40
Inductor 22µH LQH66SN220M03L
P-channel MOSFET 60V FDC5614P
0805 Chip Resistor 33kΩ CRCW08053302F
FIGURE 1. LM3489 Evaluation Board Schematic
AN201915
National Semiconductor
Application Note 1471
TK Man
May 2006
Current limit protection can be implemented by measuring
the voltage across the PFET’s R
need for a sense resistor. The cycle-by-cycle current limit
can be adjusted with a single resistor, ensuring safe opera-
tion over a range of output currents.
This LM3489 demonstration board provides a 3.3V output
with 500 mA nominal load capability (max. 1A) from a wide
input voltage range of 7V to 28V. The reference design is
optimized for overall conversion efficiency. This application
note contains the demo board schematic, PCB layout, Bill of
Materials and typical operating waveforms are provided for
reference.
ON Semiconductor
DS(ON)
Manufacturer
Central Semi
Panasonic
Panasonic
Panasonic
Panasonic
Fairchild
Murata
Vishay
Vishay
Vishay
Vishay
Sanyo
, thus eliminating the
20191515
www.national.com

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LM3489EVAL Summary of contents

Page 1

... Schottky Diode 1A 40V CMSH1-40 L Inductor 22µH LQH66SN220M03L M1 P-channel MOSFET 60V FDC5614P R1 0805 Chip Resistor 33kΩ CRCW08053302F © 2006 National Semiconductor Corporation National Semiconductor Application Note 1471 TK Man May 2006 Current limit protection can be implemented by measuring the voltage across the PFET’s R need for a sense resistor ...

Page 2

... Chip Resistor 270Ω CRCW08052700F 0603 Chip Resistor 270Ω ERJ3GEYF271 U1 Buck Controller With ENABLE PIN LM3489MM Demonstration Board PCB Layout FIGURE 2. LM3489 Demonstration Board PCB Top Overlay www.national.com Manufacturer Panasonic Panasonic Panasonic Panasonic National Semiconductor 20191502 2 Vishay Vishay Vishay ...

Page 3

Demonstration Board PCB Layout FIGURE 3. LM3489 Demonstration Board PCB Top Layer Layout FIGURE 4. LM3489 Demonstration Board PCB Bottom Layer Layout (Continued) 20191503 20191504 3 www.national.com ...

Page 4

Demonstration Board Quick Setup Procedures Step 1 Connect power supply to VIN terminals 2 Connect load to the VOUT terminals 3 SD jumper should left open for normal operation -Short this jumper to shutdown 4 Set V = 12V, with ...

Page 5

Typical Performance and Waveforms for V = 3.3V 25˚C, unless otherwise specified. OUT J Efficiency vs Load Current Continuous Mode Operation Load Transient (V = 3.3V, 50mA - 500mA Load) OUT All curves taken OUT ...

Page 6

Typical Performance and Waveforms V = 3.3V 25˚C, unless otherwise specified. (Continued) OUT J Enable TransientLoad Transient (V = 3.3V, 500mA Loaded) OUT www.national.com All curves taken OUT 20191512 6 = 12V with the demonstration ...

Page 7

... BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. ...

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