LP3906 datasheet(33/47 Pages) TI1

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2 MHz

Time

Spread Spectrum

frequency

10 kHz triangle

wave

Peak frequency deviation

2 kHz triangle

wave

LP3906

www.ti.com

SNVS456M – AUGUST 2006 – REVISED MAY 2013

BUCK 2 RAMP CONTROL REGISTER (B2RC) - 0x2B

This register allows the user to program the rate of change between the target voltages of Buck 2

D6-4

D3-0

Name

- - - -

B2RS

Access

- - - -

R/W

Data

Reserved

Data Code

Ramp Rate mV/us

4h'0

Instant

4h'1

4h'2

4h'3

4h'4

4h'5

4h'6

4h'7

4h'8

4h'9

4h'A

4h'B - 4h'F

Reset

010

1000

BUCK FUNCTION REGISTER (BFCR) – 0x38

This register allows the Buck switcher clock frequency to be spread across a wider range, allowing for less

Electro-magnetic Interference (EMI). The spread spectrum modulation frequency refers to the rate at which the

frequency ramps up and down, centered at 2 MHz.

D7-2

Name

—

BK_SLOMOD

BK_SSEN

Access

—

R/W

Data

Reserved

Buck Spread Spectrum Modulation

Spread Spectrum Function Output

0 – 10 kHz triangular wave

0 – Disabled

1 – 2 kHz triangular wave

1 – Enabled

Reset

000010

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