LP3906SQ-JXXI Datasheet, PDF (33/47 Pages) Texas Instruments – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C ompatible

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
Name
Access
Data
Reset
D7
----
----
Reserved
D6-4
----
----
Reserved
0
010
Data Code
4h'0
4h'1
4h'2
4h'3
4h'4
4h'5
4h'6
4h'7
4h'8
4h'9
4h'A
4h'B - 4h'F
D3-0
B2RS
R/W
1000
Ramp Rate mV/us
Instant
1
2
3
4
5
6
7
8
9
10
10
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.
2 MHz
Spread Spectrum
frequency
Peak frequency deviation
2 kHz triangle
wave
10 kHz triangle
wave
Name
Access
Data
Reset
D7-2
—
—
Reserved
000010
Time
D1
BK_SLOMOD
R/W
Buck Spread Spectrum Modulation
0 – 10 kHz triangular wave
1 – 2 kHz triangular wave
1
D0
BK_SSEN
R/W
Spread Spectrum Function Output
0 – Disabled
1 – Enabled
0
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