LMR61428

SNVS815 – JUNE 2012

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Power components - such as the inductor, input and output filter capacitors, and output diode - should be placed

as close to the regulator IC as possible, and their traces should be kept short, direct and wide. The ground pins

of the input and output filter capacitors and the PGND and SGND pins of LMR61428 should be connected using

copper area to dissipate the heat due to power loss in the circuitry and prevent the thermal protection circuitry in

the IC from shutting the IC down. Additional ground planes as intermediate levels help with shielding and

improve EMI mitigation.

Application Examples

Figure 8. EXAMPLE 1. 5V/0.5A Step-Up Regulator

U1

Texas Instruments

LMR61428XMM

C1

Vishay/Sprague

595D226X06R3B2T, Tantalum

C2

Vishay/Sprague

595D686X0010C2T, Tantalum

D1

Motorola

MBRS140T3

L

Coilcraft

DT1608C-682

Figure 9. EXAMPLE 2. 2mm Tall 5V/0.2A Step-Up Regulator for Low Profile Applications

10

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