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参数资料
| 型号： | MAX6440UTKRYD3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MON SNGL SOT23-6 |
| 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-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated μP Reset
CURRENT-
V HTH
LIMITED
AC WALL
ADAPTER
DC/DC CONVERTER
IN SHDN
V BATT
V HYST
LED
OUT
V LTH
IN
CHG
GATE
BATT
1-CELL
V BATT
V CC
LBOL
LBO
t LBOP
PULSE-WIDTH
SELECT INPUT
TSEL
MAX1879
GND
Li+
BATTERY
MAX6441
MAX6442
LBOH
THERM
ADJ
LBOLH
HTH = BATTERY VOLTAGE GOOD, ENABLE OPERATION.
LTH = BATTERY VOLTAGE LOW, SUSPEND/DISABLE OPERATION.
Figure 5. Hysteresis
THERMISTOR
Figure 6. Li+ Charger Application (Using MAX1879)
GND
RESET
logic levels, open-drain/open-collector outputs, or a
momentary push-button switch to GND (the MR function
Li+
3.6V
IN
DC/D C
SHDN
OUT
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
V BATT
LBOL
V CC
LBOH
NMI
V CC
additional noise immunity (see Figure 4).
Hysteresis
MR
MAX6441
MAX6442
GND
RESET
μ P
RESET
GND
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
Figure 7. DC-to-DC Converter Application
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-
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).
10
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