PVIN

SW

AGND

FB

PGOOD

EN

SS/TRK

AVIN

COMP

LM20124

L

VCC

PGND

(optional)

PVIN

SW

PGND

L

LM20124

LOOP1

LOOP2

LM20124, LM20124-Q1

www.ti.com

SNVS507F – OCTOBER 2007 – REVISED MARCH 2013

5. Make input and output bus connections as wide as possible. This reduces any voltage drops on the input or

output of the converter and can improve efficiency. If voltage accuracy at the load is important make sure

feedback voltage sense is made at the load. Doing so will correct for voltage drops at the load and provide the

best output accuracy.

6. Provide adequate device heatsinking. Use as many vias as is possible to connect the DAP to the power plane

heatsink. For best results use a 4x4 via array with a minimum via diameter of 12 mils. See the Thermal

Considerations section to insure enough copper heatsinking area is used to keep the junction temperature below

125°C.

Figure 33. Schematic of LM20124 Highlighting Layout Sensitive Nodes

Typical Application Circuits

This section provides several application solutions with a bill of materials. All bill of materials reference the below

figure. The compensation for these solutions were optimized to work over a wide range of input and output

outline in the design guide.

Designator

Description

Part Number

Manufacturer

Qty

U1

Synchronous Buck Regulator

LM20124

Texas Instruments

1

100 µF, 1210, X5R, 6.3V

GRM32ER60J107ME20

Murata

1

100 µF, 1210, X5R, 6.3V

GRM32ER60J107ME20

Murata

1

L

1 µH, 6 m

Ω

MSS1038-102NL

Coilcraft

1

1

Ω, 0603

CRCW06031R0J-e3

Vishay-Dale

1

100 nF, 0603, X7R, 16V

GRM188R71C104KA01

Murata

1

1 µF, 0603, X5R, 6.3V

GRM188R60J105KA01

Murata

1

6.65 k

Ω, 0603

CRCW06037871F-e3

Vishay-Dale

1

2.2 nF, 0603, X7R, 25V

VJ0603Y222KXXA

Vishay-Vitramon

1

33 nF, 0603, X7R, 25V

VJ0603Y333KXXA

Vishay-Vitramon

1

31.6 k

Ω, 0603

CRCW06033162F-e3

Vishay-Dale

1

10.2 k

Ω, 0603

CRCW06031022F-e3

Vishay-Dale

1

Copyright © 2007–2013, Texas Instruments Incorporated

Submit Documentation Feedback

21

Product Folder Links: LM20124 LM20124-Q1