LM2831XMF EVAL National Semiconductor, LM2831XMF EVAL Datasheet

EVAL BOARD FOR LM2831XMF

LM2831XMF EVAL

Manufacturer Part Number
LM2831XMF EVAL
Description
EVAL BOARD FOR LM2831XMF
Manufacturer
National Semiconductor
Datasheets
1.LM2831YMFNOPB.pdf (27 pages)
2.LM2831XMF_EVAL.pdf (6 pages)

Specifications of LM2831XMF EVAL

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
0.6 ~ 5.5V
Current - Output
1.5A
Voltage - Input
3 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
1.6MHz
Board Type
Fully Populated
Utilized Ic / Part
LM2831
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
Other names
*LM2831XMF EVAL
LM2831XMFEVAL
© 2009 National Semiconductor Corporation
LM2831X 6-Pin LLP Demo
Board
Introduction
The demo board included in this shipment converts 3V to 5.5V
input to 1.8V output for 1.5A load current using the LM2831X
1.6 MHz DC-DC switching converter. This is a 4-layer board
using the internal layers as a VIN plane and Ground plane.
A bill of materials below describes the parts used on this demo
board. A schematic and layout have also been included below
Pin-Out
Pin Description 6-Pin LLP
DAP
Pin
1
2
3
4
5
6
Die Attach Pad
Name
VIND
VINA
GND
SW
EN
FB
Feedback pin. Connect to external resistor divider to set output voltage.
Signal and power ground pin. Place the bottom resistor of the feedback network as close
as possible to this pin.
Output switch. Connect to the inductor and catch diode.
Power Input supply.
Control circuitry supply voltage. Connect VINA to VIND on PC board.
Enable control input. Logic high enables operation. Do not allow this pin to float or be
greater than VINA + 0.3V.
Connect to system ground for low thermal impedance, but it cannot be used as a primary
GND connection.
LM2831X 6-Pin LLP Demo Board Schematic
300007
National Semiconductor
Application Note 1550
Matthew Reynolds
January 8, 2009
along with measured performance characteristics. The above
restrictions for the input voltage are valid only for the demo
board as shipped with the demo board schematic below.
Operating Conditions
V
V
I
O
IN
O
= 1.5A
= 1.8V
= 3V to 5.5V
30000702
Function
30000701
www.national.com

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LM2831XMF EVAL Summary of contents

Page 1

... VIND 5 VINA 6 EN DAP Die Attach Pad © 2009 National Semiconductor Corporation National Semiconductor Application Note 1550 Matthew Reynolds January 8, 2009 along with measured performance characteristics. The above restrictions for the input voltage are valid only for the demo board as shipped with the demo board schematic below. ...

Page 2

LM2831 Gain/Phase LM2831 Efficiency: Vin = 3.3V 1.8V www.national.com 30000703 2 30000704 30000705 ...

Page 3

Part ID U1 1.5A Buck Regulator C1, Input Cap C2 Output Cap C3 Output Cap D1, Catch Diode 0. – R9 Layout Bill Of Materials LM2831X-Version Part Value Manufacturer NSC 22 µF, 6.3V, X5R ...

Page 4

Internal Plane 1 (GND) 4 30000707 ...

Page 5

Internal Plane Bottom Layer 5 30000708 30000709 www.national.com ...

Page 6

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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