LP3910 Datasheet, PDF (60/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
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8.6.14 Buck-Boost Control Register
The buck-boost is controlled through its dedicated control register. The buck-boost is enabled through the power-
on sequencing. The system processor is required to select the desired buck-boost output voltage through bits
D4–0 before enabling it by setting bit D6 in the control register. The buck-boost is also disabled when b’00000 is
programmed in the register field D4–0, regardless of the state of the bit D6. When the buck-boost is disabled, its
output is internally tied low through a 1-MΩ resistor. If D4–0 is set to b’00000 the 1 MΩ resistor is disconnected.
The default output voltage for the buck-boost is factory programmable.
Access
Data
Reset
Table 14. Buck–Boost Control Register (07)H
D7
Read Only 0
Reserved
D6
Force PWM
0: Automatic
modulation mode
1: Force PWM
modulation
D5
Operation
0: disable
1: enable
n/a
0
1
D4–0
R/W
Buck–Boost Output Voltage (V)
5’h00
disabled
5’h01
1.80
5’h02
1.85
5’h03
1.90
5’h04
1.95
5’h05
2.00
5’h06
2.05
5’h07
2.10
5’h08
2.15
5’h09
2.20
5’h0A
2.25
5’h0B
2.30
5’h0C
2.35
5’h0D
2.40
5’h0E
2.45
5’h0F
2.50
5’h10
2.55
5’h11
2.60
5’h12
2.65
5’h13
2.70
5’h14
2.75
5’h15
2.80
5’h16
2.85
5’h17
2.90
5’h18
2.95
5’h19
3.00
5’h1A
3.05
5’h1B
3.10
5’h1C
3.15
5’h1D
3.20
5’h1E
3.25
5’h1F
3.30
Factory-Programmed Default
60
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