LM2735XMFEVAL/NOPB National Semiconductor, LM2735XMFEVAL/NOPB Datasheet

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LM2735XMFEVAL/NOPB

Manufacturer Part Number
LM2735XMFEVAL/NOPB
Description
BOARD DEMO FOR LM2735 SOT23-5
Manufacturer
National Semiconductor
Datasheets
1.LM2735XMFEVALNOPB.pdf (4 pages)
2.LM2735XMFEVALNOPB.pdf (42 pages)

Specifications of LM2735XMFEVAL/NOPB

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2010 National Semiconductor Corporation
LM2735X 5-Pin SOT23 Demo
Board
Introduction
The demo board included in this shipment uses the LM2735X
1.6MHz DC-DC switching regulator that converts 3V to 5.5V
input to 12V output for up to 500mA load current depending
on Vin. This is a 2-layer board using the bottom layer as a
Ground plane.
A bill of materials below describes the parts used on this demo
board. A schematic and layout have also been included below
along with measured performance characteristics. The above
Pin Description for 5-Pin SOT23
Pin
1
2
3
4
5
Name
GND
VIN
SW
FB
EN
300264
LM2735X 5-Pin SOT Schematic
Function
Output switch. Connect to the inductor, output diode.
Signal and power ground pin. Place the bottom resistor of the feedback
network as close as possible to this pin.
Feedback pin. Connect FB to external resistor divider to set output voltage.
Shutdown control input. Logic high enables operation. Do not allow this pin to
float or be greater than VIN + 0.3V.
Supply voltage for power stage, and Input supply voltage.
Top View
Pin-Out
National Semiconductor
Application Note 1664
Matthew Reynolds
November 19, 2010
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
I
O
O
IN
O
_max @ 3Vin = 300mA
_max @ 5Vin = 500mA
= 12V
= 3V to 5.5V
30026402
30026401
www.national.com

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LM2735XMFEVAL/NOPB Summary of contents

Page 1

... Pin Description for 5-Pin SOT23 Pin Name GND VIN © 2010 National Semiconductor Corporation National Semiconductor Application Note 1664 Matthew Reynolds November 19, 2010 restrictions for the input voltage are valid only for the demo board as shipped with the demo board schematic below. Operating Conditions 5. 12V ...

Page 2

Bill of Materials Part ID U1 C1, Input Cap C2 Output Cap C3 Comp Cap D1, Catch Diode www.national.com Part Value Manufacturer 2.1A Boost Regulator 22µF, 6.3V, X5R 10µF, 25V, X5R 330pF 0.4V Schottky 1A, 20V ...

Page 3

PCB Layout 30026404 Top Layer 30026405 Bottom Layer 3 www.national.com ...

Page 4

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com 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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