MAX888ECJ(1999) Просмотр технического описания (PDF) - Maxim Integrated
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MAX888ECJ Datasheet PDF : 20 Pages
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Wireless and Satellite Handset
Power-Management ICs
100mA LDO Regulator 5
Regulator 5, a low-dropout linear regulator, can source a
minimum of 100mA. The output voltage is programmable
from 2.175V to 3.3V in 75mV steps for the MAX886
(Tables 1 and 2), or 1.25V to 3.50V in 150mV steps for the
MAX888 (Tables 1 and 3). IN5 may be powered from the
battery, OUT0, or any other voltage source less than 5.5V.
Control Data Byte
The control byte is eight bits long (four address bits,
four data bits). Each regulator has a DAC that sets the
output regulation voltage. Control codes are summa-
rized in Table 1.
Table 1. Control Data Byte
FUNCTION
OUT0 Output Voltage
OUT1 Output Voltage
OUT2 Output Voltage
OUT3 Output Voltage, fOSC
OUT5 Output Voltage
OUT1, 2, 4, 5 On/Off Control
OUT0 On/Off Control
Not Available
Not Available
A3
MSB
0
0
0
0
0
0
0
0
1
ADDRESS
A2
A1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
X
X
DATA
A0
D3
D2
D1
D0
LSB
0
DAC0
1
DAC1
0
DAC2
1
DAC3
fOSC
0
DAC5
1
ON5
ON4
ON2
ON1
0
X
X
X
ON0
1
X
X
X
X
X
X
X
X
X
Table 2. MAX886 Output Voltage Settings
REGULATOR OUTPUT VOLTAGE (V)
DACX DATA
OUT5
OUT2
OUT1
OUT0
D3
D2
D1
D0
2.175
2.175
2.70
2.625
0
0
0
0
2.250
2.250
2.85
2.700
0
0
0
1
2.325
2.325
3.00
2.775
0
0
1
0
2.400
2.400
3.15
2.850
0
0
1
1
2.475
2.475
3.30
2.925
0
1
0
0
2.550
2.550
3.45
3.000
0
1
0
1
2.625
2.625
3.60
3.075
0
1
1
0
2.700
2.700
3.75
3.150
0
1
1
1
2.775
2.775
3.90
3.225
1
0
0
0
2.850
2.850
4.05
3.300
1
0
0
1
2.925
2.925
4.20
3.375
1
0
1
0
3.000
3.000
4.35
3.450
1
0
1
1
3.075
3.075
4.50
3.525
1
1
0
0
3.150
3.150
4.65
3.600
1
1
0
1
3.225
3.225
4.80
3.675
1
1
1
0
3.300
3.300
4.95
3.750
1
1
1
1
Note: The output voltage of each regulator can be set independently. The POR states are in boldface.
14 ______________________________________________________________________________________
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