MAX886ECJ Просмотр технического описания (PDF) - Maxim Integrated
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MAX886ECJ Datasheet PDF : 20 Pages
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Wireless and Satellite Handset
Power-Management ICs
Table 3. MAX888/MAX1863 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.
*MAX888
**MAX1863
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
0V (REG3 Off)**
2.85V
4.65V
D3
D2
D1
D0
0
0
X
X
0
1
X
X
1
0
X
X
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
VOUT2 (REG3 Off)*
1
1
X
X
Note: The POR states are in boldface.
*MAX888
**MAX1863
3) Calculate R3:
( ) R3 = R2 VTHF − VREF − R1 × VREF
VREF − VTHF
16 ______________________________________________________________________________________
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