LP8543 datasheet(32/40 Pages) TI

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ISAT >

(VOUT ± VIN)

VOUT

VIN

Where D =

Where IRIPPLE =

(2 x L x f)

DQG '¶ = (1-D)

(VOUT ± VIN)

(VOUT)

+ IRIPPLE

IOUTMAX

'¶

'0'

Slave Address

(7 bits)

Control Register Add.

(8 bits)

Data- Data

(8 bits)

R/W

Data transfered, byte +

Ack/NAck

Slave Address

(7 bits)

'1' A

R/W

Direction of the transfer

will change at this point

From Master to Slave

From Slave to Master

A - ACKNOWLEDGE (SDA Low)

S - START CONDITION

P - STOP CONDITION

Sr - REPEATED START CONDITION

NA - ACKNOWLEDGE (SDA High)

'0'

Slave Address

(7 bits)

Control Register Add.

(8 bits)

R/W

From Master to Slave

From Slave to Master

A - ACKNOWLEDGE (SDA Low)

S - START CONDITION

P - STOP CONDITION

Data transfered, byte +

Ack

LP8543

SNVS604D – AUGUST 2009 – REVISED MARCH 2013

www.ti.com

<>Data from master [ ] Data from slave

Recommended External Components

Inductor Selection

A 15 µH shielded inductor is suggested for LP8543 boost converter. Inductor maximum current can be calculated

from the equations below.

•

IRIPPLE: Average to peak inductor current

•

IOUTMAX: Maximum load current

•

VIN: Maximum input voltage in application

•

L: Min inductor value including worst case tolerances

•

f: Minimum switching frequency

•

VOUT: Output voltage

(1)

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