LP5526

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SNVS431D – FEBRUARY 2006 – REVISED MARCH 2013

A 10uH shielded inductor is suggested for LP5526 boost converter. The inductor should have a saturation

current rating higher than the RMS current it will experience during circuit operation (1300mA). Less than 300m

Ω

ESR is suggested for high efficiency and sufficient output current. Open core inductors cause flux linkage with

circuit components and interfere with the normal operation of the circuit. This should be avoided. For high

efficiency, choose an inductor with a high frequency core material such as ferrite to reduce the core losses. To

minimize radiated noise, use a toroid, pot core or shielded core inductor. The inductor should be connected to

the SW pin as close to the IC as possible. Examples of suitable inductors are: TDK SLF6028T-100M1R3,

Coilcraft MSS6122-103MLB.

LIST OF RECOMMENDED EXTERNAL COMPONENTS

Symbol

Symbol explanation

Value

Unit

Type

C between VDD1,2 and GND

100

nF

Ceramic, X7R / X5R

C between VDDIO and GND

100

nF

Ceramic, X7R / X5R

C between VDDA and GND

1

µF

Ceramic, X7R / X5R

C between FB and GND

2 x 4.7 or 1 x

µF

Ceramic, X7R / X5R, tolerance +/-

10

10%

Maximum DC bias effect at 20V

-50

%

C between battery voltage and GND

10

µF

Ceramic, X7R / X5R

10

µH

Shielded inductor, low ESR

Saturation current

1300

mA

100

nF

Ceramic, X7R / X5R

2.4

k

Ω

±1%

82

k

Ω

±1%

Rectifying diode (Vf at maximum load)

0.3-0.5

V

Reverse voltage

30

V

Schottky diode

Repetitive peak current

1500

mA

C in EMI filter

100

pF

Ceramic, X7R / X5R, 50V

R in EMI filter

390

Ω

±1%

LEDs

User Defined

Note: See Application Note AN-1442 "Design and Programming Examples for Lighting Management Unit

LP5526" SNVA145 for more information on how to design with LP5526

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