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參數資料
| 型號： | MAX6442KAPTZD7-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Single Synchronous Buck Pulse-Width Modulation (PWM) Controller; Temperature Range: 0°C to 70°C; Package: 16-QFN T&R |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SOT-23, 8 PIN |
| 文件頁數： | 10/14頁 |
| 文件大?。?/td> | 235K |
| 代理商： | MAX6442KAPTZD7-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
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| MAX6441UTB | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated ?P Reset |
| MAX6441UTC | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated ?P Reset |
| MAX6441UTD | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated ?P Reset |
| MAX6441UTE | Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated ?P Reset |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX6443US16L | 制造商:Maxim Integrated Products 功能描述:+P RESET CIRCUITS WITH LONG MANUAL - Cut Tape Product |
| MAX6443US16L+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.58V 7UA 4PIN SOT-143 - Rail/Tube |
| MAX6443US16L+T | 功能描述:監(jiān)控電路 Single uPower Reset Circuit RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6443US16L-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6443US17L | 制造商:Maxim Integrated Products 功能描述:+P RESET CIRCUITS WITH LONG MANUAL - Rail/Tube |
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