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参数资料
| 型号： | MAX6849KAZD7+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MON ADJ SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 电池监控器 |
| 电池化学： | 碱性，锂离子，镍镉，镍金属氢化物 |
| 电源电压： | 1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
Low-Power, Adjustable Battery Monitors with
Hysteresis and Integrated μP Reset
582 mV × R TOTAL
R 2 = ?
? - R 3
1) Choose a value for R TOTAL , the sum of R1, R2, and
R3. Because the MAX6848/MAX6849 have very high
input impedance, R TOTAL can be up to 500k ? .
2) Calculate R3 based on R TOTAL and the desired
upper trip point:
R 3 =
V TRIPHIGH
3) Calculate R2 based on R TOTAL , R3, and the desired
lower trip point:
? 582mV × R TOTAL ?
? V TRIPLOW ?
to three alkaline/NiCd/NiMH cells. The LBOH output
indicates that the battery voltage is weak, and is used
to warn the microprocessor of potential problems.
Armed with this information, the microprocessor can
reduce system power consumption. The LBOL output
indicates the battery is empty and system power should
be disabled. By connecting LBOL to the SHDN pin of the
DC-DC converter, power to the microprocessor is
removed. Microprocessor power does not return until the
battery has recharged to a voltage greater than V LTH+
(see Figure 7).
Table 1. Factory-Trimmed V CC Reset
Threshold Levels
PART NO.
V CC NOMINAL
4) Calculate R1 based on R TOTAL , R3, and R2:
R 1 = R TOTAL - R 2 - R 3
5) LBOL high-trip level:
V TRIPLOW ? 1.05
6) LBOH high-trip level:
V TRIPHIGH ? 1.05
Monitoring Multicell Battery Applications
For monitoring multicell Li+ (or a higher number of alka-
SUFFIX
(_)
T
S
R
Z
Y
W
V
RESET
THRESHOLD (V)
3.075
2.925
2.625
2.313
2.188
1.665
1.575
line/NiCd/NiMH cells), connect V DD to a supply voltage
between 1.6V to 5.5V. Figure 6 shows V DD connected
directly to V CC. To calculate the values of R1, R2, and
Table 2. V CC Reset Timeout Period Suffix
Guide
R3, see the Resistor-Value Selection section.
TIMEOUT
ACTIVE TIMEOUT PERIOD (ms)
DC-DC Converter Application
The MAX6848/MAX6849 dual battery monitors can be
used in conjunction with a DC-DC converter to power
microprocessor systems using a single Li+ cell or two
PERIOD SUFFIX
D3
D7
MIN
150
1200
MAX
300
2400
V CC
IN
D C-D C
OUT
V MONITORED
V DD
V CC
LBO*
Li+
3.6V
SHDN
R1
MAX6846
V DD
LBOL
V CC
V CC
R2
LTHIN
MAX6847
MAX6848
MAX6849
(LBOL)
(LBOH)
LTHIN
LBOH
NMI
μ P
MAX6848
HTHIN
GND
MAX6849
R3
* FOR THE MAX6846/MAX6847.
( ) FOR THE MAX6848/MAX6849.
HTHIN
GND
RESET
RESET
GND
Figure 6. Monitoring Multicell Li+ Applications
Figure 7. DC-DC Converter Application
10
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相关代理商/技术参数 |
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| MAX684EUA+T | 功能描述:电荷泵 3.3Vin to Reg 5Vout Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX684EUA-T | 功能描述:电荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX6850AEE | 功能描述:VFD驱动器 RoHS:否 制造商:Maxim Integrated 工作电源电压:8 V to 76 V, 3 V to 5.5 V 电源电流:0.9 mA, 700 uA 最大工作温度:+ 125 C 封装 / 箱体:SOIC-20 封装:Tube |
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