AN-1666 LM2735X 6-Pin WSON Demo Board User's Guide 1 Introduction

AN-1666 LM2735X 6-Pin WSON Demo Board User's Guide 1 Introduction
User's Guide
SNVA260A – June 2007 – Revised April 2013
AN-1666 LM2735X 6-Pin WSON Demo Board
1
Introduction
This demo board 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 describes the parts used on this demo board. A schematic and layout have also been
included, 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 is shown in Figure 1.
2
Operating Conditions
•
•
•
VIN = 3V to 5.5V
VO = 12V
IO = 500mA
VIN
VO
L1
C1
C5
D1
1
6
2
5
3
4
R1
R2
C2
C3
C4
R3
Figure 1. LM2735X 6-Pin WSON Schematic
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SNVA260A – June 2007 – Revised April 2013
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AN-1666 LM2735X 6-Pin WSON Demo Board
Copyright © 2007–2013, Texas Instruments Incorporated
1
Pin Description for 6-Pin WSON
3
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Pin Description for 6-Pin WSON
PGND
1
6
SW
VIN
2
5
AGND
EN
3
4
FB
Figure 2. Pin-Out
Table 1. Pin Description
4
Pin
Name
Function
1
PGND
Power ground pin. Place PGND and output capacitor GND close together.
2
VIN
Supply voltage for power stage, and Input supply voltage.
3
EN
Shutdown control input. Logic high enables operation. Do not allow this pin to float or be
greater than VIN + 0.3V.
4
FB
Feedback pin. Connect FB to external resistor divider to set output voltage.
5
AGND
6
SW
DAP
GND
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.
Bill of Materials
Table 2. Bill of Materials
2
Part ID
Part Value
Manufacturer
U1
2.1A Boost Regulator
Texas Instruments
LM2735
C1 Input Cap
22µF, 6.3V, X5R
TDK
C2012X5R0J226M
TDK
C3216X5R1E106M
C1608X5R1H331K
C5 Input Cap
No Load
C3 Output Cap
10µF, 25V, X5R
C4 Output Cap
No Load
Part Number
C2 Comp Cap
330pF
TDK
D1, Catch Diode
0.4Vf Schottky 1A, 20VR
ST
STPS120M
L1
6.2µH 3A
Coilcraft
MSS7341-622
R3
10.2kΩ, 1%
Vishay
CRCW06031022F
R2
86.6kΩ, 1%
Vishay
CRCW06038662F
R1
100kΩ, 1%
Vishay
CRCW06031003F
AN-1666 LM2735X 6-Pin WSON Demo Board
Copyright © 2007–2013, Texas Instruments Incorporated
SNVA260A – June 2007 – Revised April 2013
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LM2735X η vs Load Current, VO = 12V
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5
LM2735X η vs Load Current, VO = 12V
Figure 3. LM2735X η vs Load Current, VO = 12V
SNVA260A – June 2007 – Revised April 2013
Submit Documentation Feedback
AN-1666 LM2735X 6-Pin WSON Demo Board
Copyright © 2007–2013, Texas Instruments Incorporated
3
PCB Layout
6
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PCB Layout
Figure 4. Top Layer
Figure 5. Bottom Layer
4
AN-1666 LM2735X 6-Pin WSON Demo Board
Copyright © 2007–2013, Texas Instruments Incorporated
SNVA260A – June 2007 – Revised April 2013
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