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參數(shù)資料
| 型號(hào)： | MAX888ECJ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Wireless and Satellite Handset Power-Management ICs |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, TQFP-32 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 257K |
| 代理商： | MAX888ECJ |
M
Wireless and S atellite Handset
Power-Management ICs
______________________________________________________________________________________
15
Low-Battery Detec tor
A low-battery comparator detects low-battery condi-
tions. The trip threshold is internally set to V
REF
(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
500k
to 1.5M
.
2) Calculate R2:
3) Calculate R3:
R3
R2 V
V
R1
V
V
V
THF
REF
REF
REF
THF
)
R
R
V
V
THR
REF
2
1
1
=
±
Table 3. MAX888 Output Voltage Settings
Table 5. OUT3 Output Voltage Setting
Table 4. Oscillator Frequency Setting
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1.25
1.40
1.55
1.70
1.85
2.00
2.15
2.30
2.45
2.60
2.75
2.90
3.05
3.20
3.35
3.50
1.527
1.627
1.727
1.827
1.927
2.027
2.127
2.227
2.327
2.427
2.527
2.627
2.727
2.827
2.927
3.027
1.25
1.40
1.55
1.70
1.85
2.00
2.15
2.30
2.45
2.60
2.75
2.90
3.05
3.20
3.35
3.50
1.527
1.627
1.727
1.827
1.927
2.027
2.127
2.227
2.327
2.427
2.527
2.627
2.727
2.827
2.927
3.027
REGULATOR OUTPUT VOLTAGE (V)
OUT2
DACX DATA
OUT1
OUT0
D2
D0
D1
D3
OUT5
Note:
The output voltage of each regulator can be set independently. The POR states are in boldface.
0
0
1
1
X
X
X
X
0
1
0
1
D3
D1
D2
ADDRESS 03h
DATA
0V (REG3 Off)
2.85V
4.65V
VOUT2 (REG3 Off)
X
X
X
X
D0
X
X
X
X
0
0
1
1
X
X
X
X
0
1
0
1
D0
D3
D1
D2
670
925
ADDRESS 03h DATA
f
OSC
(kHz)
375
535
Note:
The POR states are in boldface.
Note:
The POR states are in boldface.
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