MAX888ECJ(1999) 查看數據表（PDF） - Maxim Integrated
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MAX888ECJ Datasheet PDF : 20 Pages
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Wireless and Satellite Handset
Power-Management ICs
Table 3. MAX888 Output Voltage Settings
REGULATOR OUTPUT VOLTAGE (V)
DACX DATA
OUT5
OUT2
OUT1
OUT0
D3
D2
D1
D0
1.25
1.527
1.25
1.527
0
0
0
0
1.40
1.627
1.40
1.627
0
0
0
1
1.55
1.727
1.55
1.727
0
0
1
0
1.70
1.827
1.70
1.827
0
0
1
1
1.85
1.927
1.85
1.927
0
1
0
0
2.00
2.027
2.00
2.027
0
1
0
1
2.15
2.127
2.15
2.127
0
1
1
0
2.30
2.227
2.30
2.227
0
1
1
1
2.45
2.327
2.45
2.327
1
0
0
0
2.60
2.427
2.60
2.427
1
0
0
1
2.75
2.527
2.75
2.527
1
0
1
0
2.90
2.627
2.90
2.627
1
0
1
1
3.05
2.727
3.05
2.727
1
1
0
0
3.20
2.827
3.20
2.827
1
1
0
1
3.35
2.927
3.35
2.927
1
1
1
0
3.50
3.027
3.50
3.027
1
1
1
1
Note: The output voltage of each regulator can be set independently. The POR states are in boldface.
Table 4. Oscillator Frequency Setting
ADDRESS 03h DATA
fOSC (kHz)
D3
D2
D1
D0
375
X
X
0
0
535
X
X
0
1
670
X
X
1
0
925
X
X
1
1
Note: The POR states are in boldface.
Table 5. OUT3 Output Voltage Setting
ADDRESS 03h
DATA
D3
D2
D1
D0
0V (REG3 Off)
0
0
X
X
2.85V
0
1
X
X
4.65V
1
0
X
X
VOUT2 (REG3 Off)
1
1
X
X
Note: The POR states are in boldface.
Low-Battery Detector
A low-battery comparator detects low-battery condi-
tions. The trip threshold is internally set to VREF (1.25V
typ). LBHYS sets the hysteresis with external resistors.
LBO and LBHYS have open-drain outputs. The exter-
nally set low-battery threshold must be higher than the
UVLOF threshold (2.45V typical).
Set the threshold and hysteresis by connecting resis-
tors R1 (between BATT and LBI), R2 (between LBI and
LBHYS), and R3 (LBHYS and GND) (Figure 2).
After choosing the upper and lower thresholds, calcu-
late the resistor values as follows:
1) Choose a value for R1. Typical values range from
500kΩ to 1.5MΩ.
2) Calculate R2:
R2 =
R1
VTHR
VREF
–
1
3) Calculate R3:
( ) ⋅ R3 = R2 VTHF − VREF − R1 VREF
VREF − VTHF
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