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参数资料
| 型号： | MAX16034 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power Battery Backup Circuits in Small レDFN Packages |
| 中文描述： | 低功耗电池备份电路，采用微型µDFN封装 |
| 文件页数： | 12/21页 |
| 文件大小： | 228K |
| 代理商： | MAX16034 |
M
Low-Power Battery Backup
Circuits in Small μDFN Packages
12
______________________________________________________________________________________
RESET
A μP’s reset input puts the μP in a known state. The
MAX16033–MAX16040 μP supervisory circuits assert a
reset to prevent code-execution errors during power-
up, power-down, and brownout conditions.
RESET
asserts when V
CC
is below the reset threshold voltage
and for at least 140ms (t
RP
) after V
CC
rises above the
reset threshold.
RESET
also asserts when
MR
is low
(MAX16033/MAX16037) or when RESETIN is below
1.235V (MAX16036/MAX16040). The MAX16034/
MAX16038 watchdog function causes
RESET
to assert in
pulses following a watchdog timeout (Figure 2). The
MAX160_ _L devices provide push-pull
RESET
outputs.
The MAX160_ _P devices provide open-drain
RESET
outputs.
Applications Information
Operation Without a Backup Power Source
The MAX16033–MAX16040 provide a battery backup
function. If a backup power source is not used, connect
BATT to GND and OUT to V
CC
.
Using a Super Cap as a
Backup Power Source
Super caps are capacitors with extremely high capaci-
tance, such as 0.47F. Figure 5 shows two methods to
use a super cap as a backup power source. Connect
the super cap through a diode to the 3V input (Figure
5a) or connect the super cap through a diode to 5V
(Figure 5b) if a 5V supply is available. The 5V supply
charges the super cap to a voltage close to 5V, allow-
ing a longer backup period. Since V
BATT
can be higher
than V
CC
while V
CC
is above the reset threshold volt-
age, there are no special precautions required when
using these μP supervisors with a super cap.
(a)
3V OR 3.3V
0.47F
1N4148
V
CC
BATT
MAX16033–
MAX16040
(b)
3V OR 3.3V
5V
0.47F
1N4148
V
CC
BATT
MAX16033–
MAX16040
Figure 5. Using a Super Cap as a Backup Source
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16035 | Low-Power Battery Backup Circuits in Small レDFN Packages |
| MAX16036 | Low-Power Battery Backup Circuits in Small レDFN Packages |
| MAX16038 | Low-Power Battery Backup Circuits in Small レDFN Packages |
| MAX16039 | Low-Power Battery Backup Circuits in Small レDFN Packages |
| MAX16040 | Low-Power Battery Backup Circuits in Small レDFN Packages |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16034LLB23+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.32V 10PIN UDFN - Rail/Tube |
| MAX16034LLB23+T | 功能描述:监控电路 Battery Backup 2.5V-Ep RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX16034LLB26+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.63V 10PIN UDFN - Rail/Tube |
| MAX16034LLB26+T | 功能描述:监控电路 Battery Backup 3.3V-Ep RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX16034LLB29+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.93V 10PIN UDFN - Rail/Tube |
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