LP8557IAYFQR datasheet(29/49 Pages) TI2

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LP8557, LP85571

www.ti.com

SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015

8.6.1.8 BOOST

Address: 0x13h

Reset: 0x02h (LP8557I)

BFSET

BCSET

—

BCOMP

BFREQ

Bits

Field

Type

Default

Description

BFSET

R/W

Set boost frequency via the FSET pin.

0 = Boost frequency is set with BFREQ bits. (Default)

1 = boost frequency is set with an external, RFSET, resistor.

BCSET

R/W

Set boost inductor size via ISET pin.

0 = boost inductor and compensation is set with BCOMP bit. (Default)

1 = boost inductor is set with an external, RISET, resistor.

5:2

reserved

R/O

0000b

BCOMP

R/W

Boost compensation options.

0 = Boost compensation option 0

1 = Boost compensation option 1 (Default).

BFREQ

R/W

Boost frequency.

0 = 500 kHz (Default)

1 = 1 MHz

The BFSET bit distinguishes how the boost switching frequency is set. If BFSET = 0, the boost switching

frequency is set by the BFREQ bit. If BFSET = 1, the switching frequency is set with an external resistor. On the

LP8557I (BFSET = 0), the boost switching frequency is 500 kHz by default. It may be re-configured via the I2C

interface by overriding the BFREQ bit. Please note the re-configuration must be done every time the power on

the VDD pin is recycled.

The BCSET bit distinguishes how the boost inductor and compensation is set. If BCSET = 0, the boost inductor

and compensation is set by the BCOMP bit. If BCSET = 1, the boost inductor and compensation is set with an

external resistor. On the LP8557I (BCSET = 0), the boost compensation is set to option 1 by default. It may be

re-configured via I2C interface by overriding BCOMP bit. Please note the re-configuration must be done every

time the power on the VDD pin is recycled.

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