參數(shù)資料
型號(hào)： MAX6439UTCHZD7-T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 電源管理
英文描述： General Purpose Timers; Temperature Range: -40°C to 85°C; Package: 14-PDIP
中文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6
封裝： SOT-23, 6 PIN
文件頁(yè)數(shù)： 10/14頁(yè)
文件大?。?/td> 235K
代理商： MAX6439UTCHZD7-T
M
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 V
CC
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 t
DEB
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 0.1μF 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 V
BATT
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 μP Reset
10
______________________________________________________________________________________
V
BATT
LBO
t
LBOP
V
HTH
V
LTH
V
HYST
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
V
BATT
V
CC
CURRENT-
LIMITED
AC WALL
ADAPTER
IN
OUT
SHDN
DC/DC CONVERTER
Figure 6. Li+ Charger Application (Using MAX1879)
DC/DC
SHDN
MR
V
BATT
RESET
MAX6441
MAX6442
NMI
RESET
μ
P
V
CC
GND
GND
V
CC
Li+
3.6V
LBOL
LBOH
OUT
IN
Figure 7. DC-to-DC Converter Application
相關(guān)PDF資料
PDF描述
MAX6439UTCIRD3-T CMOS Serial Controller Interface; Temperature Range: -40°C to 85°C; Package: 28-CerDIP
MAX6439UTCIRD7-T CMOS Programmable Peripheral Interface; Temperature Range: -40°C to 85°C; Package: 40-CerDIP
MAX6439UTCISD3-T CMOS Octal Latching Bus Driver; Temperature Range: -40°C to 85°C; Package: 20-CerDIP
MAX6439UTCISD7-T CMOS Programmable Peripheral Interface; Temperature Range: -40°C to 85°C; Package: 44-MQFP
MAX6439UTCITD3-T CMOS Programmable Peripheral Interface; Temperature Range: -40°C to 85°C; Package: 44-PLCC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6439UTCIRD3 制造商:Maxim Integrated Products 功能描述:LOW-POWERSINGLE/DUAL-LEVEL BATTERY - Rail/Tube
MAX6439UTCIRD3+ 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 3.5V 6PIN SOT-23 - Rail/Tube
MAX6439UTCIRD3+T 功能描述:電池管理 Single 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
MAX6439UTCIRD3-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
MAX6439UTCIRD7 制造商:Maxim Integrated Products 功能描述:LOW-POWERSINGLE/DUAL-LEVEL BATTERY - Rail/Tube
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