LP8556 datasheet(41/52 Pages) TI

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LP8556

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SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012

CFG5 register

PWM_FREQ

3:0

R/W

0h = 4,808Hz (11-bit)

1h = 6,010Hz (10-bit)

2h = 7,212Hz (10-bit)

3h = 8,414Hz (10-bit)

4h = 9,616Hz (10-bit)

5h = 12,020Hz (9-bit)

6h = 13,222Hz (9-bit)

7h = 14,424Hz (9-bit)

8h = 15,626Hz (9-bit)

9h = 16,828Hz (9-bit)

Ah = 18,030Hz (9-bit)

Bh = 19,232Hz (9-bit)

Ch = 24,040Hz (8-bit)

Dh = 28,848Hz (8-bit)

Eh = 33,656Hz (8-bit)

Fh = 38,464Hz(8-bit)

CFG6

Address A6h

CFG6 register

BOOST_FREQ[1:0]

VBOOST[5:0]

Name

Bit

Access

Description

BOOST_FREQ

7:6

R/W

Set boost switching frequency when BOOST_FSET_EN = 0.

00 = 312 kHz

01 = 625 kHz

10 = 1250 kHz

11 = undefined

VBOOST

5:0

R/W

Boost output voltage. When ADAPTIVE = 1, this is the boost minimum and

initial voltage.

CFG7

Address A7h

CFG7 register

RESERVED

EN_DRV3

EN_DRV2

RESERVED

IBOOST_LIM[1:0]

Name

Bit

Access

Description

RESERVED

7:6

EN_DRV3

R/W

Selects boost driver strength to set boost slew rate. See EMI REDUCTION

section for more detail.

0 = Driver3 disabled

1 = Driver3 enabled

EN_DRV2

R/W

Selects boost driver strength to set boost slew rate. See EMI REDUCTION

section for more detail.

0 = Driver2 disabled

1 = Driver2 enabled

RESERVED

3:2

R/W

IBOOST_LIM

1:0

R/W

Select boost inductor current limit

(IBOOST_LIM_2X = 0 / IBOOST_LIM_2X = 1)

00 = 0.9A / 1.6A

01 = 1.2A / 2.1A

10 = 1.5A / 2.6A

11 = 1.8A / not permitted

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