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参数资料
| 型号： | MAX6439UTPQRD3-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | SOT-23, 6 PIN |
| 文件页数： | 2/14页 |
| 文件大小： | 235K |
| 代理商： | MAX6439UTPQRD3-T |
MAX6439–MAX6442
Manual Reset
Many microprocessor-based products require manual
reset capability, allowing the operator, a test technician,
or external logic circuitry to initiate a reset while the
monitored supplies remain above their reset thresholds.
These devices have a dedicated active-low MR pin.
When MR is pulled low, RESET asserts a one-shot low
pulse for the MR reset timeout period. The MR input has
an internal 1.5k
pullup resistor to VCC and can be left
unconnected if not used. MR can be driven with CMOS-
logic levels, open-drain/open-collector outputs, or a
momentary push-button switch to GND (the MR function
is internally debounced for the tDEB timeout period) to
create a manual reset function. If MR is driven from long
cables, or if the device is used in a noisy environment,
connect a 0.1F capacitor from MR to GND to provide
additional noise immunity (see Figure 4).
Hysteresis
Hysteresis increases the comparator’s noise margin by
increasing the upper threshold or decreasing the lower
threshold. The hysteresis prevents the output from
oscillating (chattering) when VBATT is near the low-bat-
tery threshold. This is especially important for applica-
tions where the load on the battery creates significant
fluctuations in battery voltages (see Figure 5).
Applications Information
Li+ Battery Charger Application
The MAX6441/MAX6442 dual-output battery monitors
can be used in conjunction with a battery charger to
provide a system with additional information about the
battery charge state. Many battery chargers, such as
the MAX1879, provide the user with a CHG output,
which tells the system when the battery is charged. The
MAX6441/MAX6442 dual-output battery monitors pro-
vide three outputs, which can be used to relay the bat-
tery condition to the system. This information is useful in
determining which system resources can be powered by
the battery at the current charge state (see Figure 6).
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated P Reset
10
______________________________________________________________________________________
VBATT
LBO
tLBOP
VHTH
VLTH
VHYST
HTH = BATTERY VOLTAGE GOOD, ENABLE OPERATION.
LTH = BATTERY VOLTAGE LOW, SUSPEND/DISABLE OPERATION.
Figure 5. Hysteresis
BATT
GND
1-CELL
Li+
BATTERY
THERM
ADJ
GATE
PULSE-WIDTH
SELECT INPUT
CHG
LED
THERMISTOR
IN
MAX1879
MAX6441
MAX6442
TSEL
GND
LBOL
LBOLH
RESET
LBOH
VBATT
VCC
CURRENT-
LIMITED
AC WALL
ADAPTER
IN
OUT
SHDN
DC/DC CONVERTER
Figure 6. Li+ Charger Application (Using MAX1879)
DC/DC
SHDN
MR
VBATT
RESET
MAX6441
MAX6442
NMI
RESET
P
VCC
GND
VCC
Li+
3.6V
LBOL
LBOH
OUT
IN
Figure 7. DC-to-DC Converter Application
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PDF描述 |
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| MAX6439UTPQRD7-T | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset |
| MAX6439UTPQTD7-T | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset |
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| MAX6439UTPQWD7-T | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset |
| MAX6439UTPQYD3-T | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6439UTPQRD7 | 制造商:Maxim Integrated Products 功能描述:LOW-POWERSINGLE/DUAL-LEVEL BATTERY - Rail/Tube |
| MAX6439UTPQRD7+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.3V 6PIN SOT-23 - Rail/Tube |
| MAX6439UTPQRD7+T | 功能描述:电池管理 Single Battery Monitor RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX6439UTPQRD7-T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX6439UTPQSD3 | 制造商:Maxim Integrated Products 功能描述:LOW-POWERSINGLE/DUAL-LEVEL BATTERY - Rail/Tube |
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