LM2735XSDEVAL National Semiconductor, LM2735XSDEVAL Datasheet
LM2735XSDEVAL
Manufacturer Part Number
LM2735XSDEVAL
Description
BOARD EVAL LM2735 1.6MHZ 6LLP
Manufacturer
National Semiconductor
Specifications of LM2735XSDEVAL
Main Purpose
DC/DC, Step Up
Outputs And Type
1, Non-Isolated
Voltage - Output
12V
Current - Output
500mA
Voltage - Input
3 ~ 5.5V
Regulator Topology
Boost
Frequency - Switching
1.6MHz
Board Type
Fully Populated
Utilized Ic / Part
LM2735
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
© 2007 National Semiconductor Corporation
LM2735X 6-Pin LLP Demo
Board
Introduction
The demo board included in this shipment converts 3V to 5.5V
input to 12V output for up to 500mA load current using the
LM2735X 1.6MHz DC-DC switching converter. 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 6-Pin LLP
DAP
Pin
1
2
3
4
5
6
PGND
AGND
Name
GND
VIN
SW
EN
FB
300266
Function
Power ground pin. Place PGND and output capacitor GND close together.
Supply voltage for power stage, and Input supply voltage.
Shutdown control input. Logic high enables operation. Do not allow this pin to float
or be greater than VIN + 0.3V.
Feedback pin. Connect FB to external resistor divider to set output voltage.
Signal ground pin. Place the bottom resistor of the feedback network as close as
possible to pin 5.
Output switch. Connect to the inductor, output diode.
Signal & Power ground. Connect to pin 1 & pin 5 on top layer. Place 4-6 via’s from
DAP to bottom layer GND plane.
LM2735X 6-Pin LLP Schematic
Top View
Pin-Out
National Semiconductor
Application Note 1666
Matthew Reynolds
June 2007
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
= 500mA
= 12V
= 3V to 5.5V
30026602
30026601
www.national.com
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LM2735XSDEVAL Summary of contents
Page 1
... VIN AGND 6 SW DAP GND © 2007 National Semiconductor Corporation National Semiconductor Application Note 1666 Matthew Reynolds June 2007 restrictions for the input voltage are valid only for the demo board as shipped with the demo board schematic below. Operating Conditions 5.5V IN ...
Page 2
Bill of Materials LM2735X Part Input Cap C5 Input Cap C3 Output Cap C4 Output Cap C2 Comp Cap D1, Catch Diode 0. www.national.com Part Value Manufacturer 2.1A Boost Regulator 22µF, 6.3V, X5R ...
Page 3
PCB Layout 30026604 Top Layer 30026605 Bottom Layer 3 www.national.com ...
Page 4
... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...