LP3910SQ-AN Datasheet, PDF (46/60 Pages) National Semiconductor (TI) – Power Management IC for Hard Drive Based Portable Media Players

LDO1 CONTROL REGISTER
LDO1 can be configured through its own I²C control register.
The output voltage is programmable in steps of 100 mV from
1.2V to 3.3V. LDO1 gets enabled during the power-on se-
quence. Disable/enable control is provided through bit D5 in
LDO1 CONTROL REGISTER (08)H
Access
Data
D7–6
Read Only 0
Reserved
D5
R/W
Operation
0: disable
1: enable
Reset
n/a
1
the LDO1 control register after selecting the appropriate D4–
0 settings, which determine the output voltage.
The output voltage can be altered while LDO1 is enabled.
When LDO1 is disabled, it shunts the output to AGND with a
R_SHUNT = 200Ω (Max.).
D4–0
LDO1 Output Voltage (V)
5’h00
1.2
5’h01
1.3
5’h02
1.4
5’h03
1.5
5’h04
1.6
5’h05
1.7
5’h06
1.8
5’h07
1.9
5’h08
2.0
5’h09
2.1
5’h0A
2.2
5’h0B
2.3
5’h0C
2.4
5’h0D
2.5
5’h0E
2.6
5’h0F
2.7
5’h10
2.8
5’h11
2.9
5’h12
3.0
5’h13
3.1
5’h14
3.2
5’h15 –5’h1F
3.3
5’h00
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