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參數(shù)資料
| 型號： | MAX16037 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power Battery Backup Circuits in Small レDFN Packages |
| 中文描述： | 低功耗電池備份電路，采用微型µDFN封裝 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 228K |
| 代理商： | MAX16037 |
M
Low-Power Battery Backup
Circuits in Small μDFN Packages
______________________________________________________________________________________
11
BATTON Indicator
(MAX16035/MAX16039 Only)
BATTON is a push-pull output that asserts high when in
battery-backup mode. BATTON typically sinks 3.2mA
at a 0.4V saturation voltage. In battery-backup mode,
this terminal sources approximately 10μA from OUT.
Use BATTON to indicate battery-switchover status or to
supply base drive to an external pass transistor for
higher current applications (see Figure 3).
RESETIN Comparator
(MAX16036/MAX16040 Only)
An internal 1.235V reference sets the RESETIN thresh-
old voltage.
RESET
asserts when the voltage at
RESETIN is below 1.235V. Use the RESETIN function to
monitor a secondary power supply.
Use the following equations to set the reset threshold
voltage (V
RTH
) of the secondary power supply (see
Figure 4):
V
RTH
= V
REF
(R1 / R2 + 1)
where V
REF
= 1.235V. To simplify the resistor selection,
choose a value for R2 and calculate R1.
R1 = R2 [(V
RTH
/ V
REF
) - 1]
Since the input current at RESETIN is 25nA (max), large
values (up to 1M
) can be used for R2 with no signifi-
cant loss in accuracy.
Power-Fail Comparator
The MAX16033–MAX16040 issue an interrupt (nonmask-
able or regular) to the μP when a power failure occurs.
The power line is monitored by two external resistors con-
nected to the power-fail input (PFI). When the voltage at
PFI falls below 1.235V, the power-fail output (
PFO
) drives
the processor’s NMI input low. An earlier power-fail warn-
ing can be generated if the unregulated DC input of the
regulator is available for monitoring. The MAX16033–
MAX16040 turn off the power-fail comparator and force
PFO
low when V
CC
falls below the reset threshold volt-
age (see Figure 1). The MAX160_ _L devices provide
push-pull
PFO
outputs. The MAX160_ _P devices provide
open-drain
PFO
outputs.
2.4V TO 5.5V
CE
(CEIN)
( ) FOR MAX16035 ONLY
A0–A15
μ
P
CMOS RAM
BATTON
V
CC
BATT
(CEOUT)
GND
RESET
OUT
0.1
μ
F
ADDRESS
DECODE
MAX16035
MAX16039
RESET
Figure 3. MAX16035/MAX16039 BATTON Driving an External Pass Transistor
MAX16036
MAX16040
R1
RESETIN
V
IN
V
CC
R2
Figure 4. Setting RESETIN Voltage for the
MAX16036/MAX16040
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX16033 | Low-Power Battery Backup Circuits in Small レDFN Packages |
| MAX16034 | Low-Power Battery Backup Circuits in Small レDFN Packages |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX16037LLA23+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.32V 8PIN UDFN - Rail/Tube |
| MAX16037LLA23+T | 功能描述:監(jiān)控電路 Battery Backup 2.5V-Ep RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 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(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX16037LLA26+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.63V 8PIN UDFN - Rail/Tube |
| MAX16037LLA26+T | 功能描述:監(jiān)控電路 Battery Backup 2.63V RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 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(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX16037LLA29+ | 制造商:Maxim Integrated Products 功能描述:MAXIM MAX16037LLA29+ VOLTAGE SUPERVISORS - Tape and Reel 制造商:Maxim Integrated Products 功能描述:Maxim MAX16037LLA29+ Voltage Supervisors |
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