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參數(shù)資料
| 型號： | MAX6849KAZD3-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | MO-178, SOT-23, 8 PIN |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 257K |
| 代理商： | MAX6849KAZD3-T |
MAX6846–MAX6849
Low-Power, Adjustable Battery Monitors with
Hysteresis and Integrated P Reset
10
______________________________________________________________________________________
1) Choose a value for RTOTAL, the sum of R1, R2, and
R3. Because the MAX6848/MAX6849 have very high
input impedance, RTOTAL can be up to 500k
.
2) Calculate R3 based on RTOTAL and the desired
upper trip point:
3) Calculate R2 based on RTOTAL, R3, and the desired
lower trip point:
4) Calculate R1 based on RTOTAL, R3, and R2:
5) LBOL high-trip level:
VTRIPLOW 1.05
6) LBOH high-trip level:
VTRIPHIGH 1.05
Monitoring Multicell Battery Applications
For monitoring multicell Li+ (or a higher number of alka-
line/NiCd/NiMH cells), connect VDD to a supply voltage
between 1.6V to 5.5V. Figure 6 shows VDD connected
directly to VCC. To calculate the values of R1, R2, and
R3, see the Resistor-Value Selection section.
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
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 VLTH+
(see Figure 7).
RR
R
TOTAL
12
3
=
--
R
mV
R
V
R
TOTAL
TRIPLOW
2
582
3
=
×
-
R
mV
R
V
TOTAL
TRIPHIGH
3
582
=
×
PART NO.
SUFFIX
( _ )
VCC NOMINAL
RESET
THRESHOLD (V)
T
3.075
S
2.925
R
2.625
Z
2.313
Y
2.188
W
1.665
V
1.575
Table 1. Factory-Trimmed VCC Reset
Threshold Levels
ACTIVE TIMEOUT PERIOD (ms)
TIMEOUT
PERIOD SUFFIX
MIN
MAX
D3
150
300
D7
1200
2400
Table 2. VCC Reset Timeout Period Suffix
Guide
DC-DC
SHDN
VDD
RESET
MAX6848
MAX6849
LTHIN
HTHIN
NMI
RESET
P
VCC
GND
VCC
Li+
3.6V
LBOL
LBOH
OUT
IN
Figure 7. DC-DC Converter Application
MAX6846
MAX6847
MAX6848
MAX6849
VMONITORED
VDD
VCC
LTHIN
HTHIN
GND
* FOR THE MAX6846/MAX6847.
( ) FOR THE MAX6848/MAX6849.
(LBOH)
R1
R2
R3
LBO*
(LBOL)
Figure 6. Monitoring Multicell Li+ Applications
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| MAX6849KAZD7+T | 功能描述:電池管理 Single Adjustable Battery Monitor RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX6849KAZD7-T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX684EUA | 功能描述:電荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX684EUA+ | 功能描述:電荷泵 3.3Vin to Reg 5Vout Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX684EUA+T | 功能描述:電荷泵 3.3Vin to Reg 5Vout Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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