LP3906 Datasheet, PDF (30/38 Pages) National Semiconductor (TI) – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface

LP3906 Control Registers (Continued)
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.
Name
Access
Data
Reset
D7-2
—
—
Reserved
000010
D1
BK_SLOMOD
R/W
Buck Spread Spectrum Modulation
0 – 10 kHz triangular wave
1 – 2 kHz triangular wave
1
20197825
D0
BK_SSEN
R/W
Spread Spectrum Function Output
0 – Disabled
1 – Enabled
0
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