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參數(shù)資料
| 型號： | 5962-8766001GA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | MOSFETs |
| 英文描述： | 2 CHANNEL, BUF OR INV BASED MOSFET DRIVER, MBCY8 |
| 封裝： | METAL CAN-8 |
| 文件頁數(shù)： | 15/15頁 |
| 文件大?。?/td> | 784K |
| 代理商： | 5962-8766001GA |
MAX706P/R/S/T
,MAX706AP/AR/AS/A
T
,MAX708R/S/T
+3V Voltage Monitoring, Low-Cost P
Supervisory Circuits
_______________________________________________________________________________________
9
To build an early-warning power-failure circuit, use the
power-fail comparator input (PFI) to monitor the unregu-
lated DC supply voltage (see the
Typical Operating
Circuits). Connect the PFI to a resistive-divider network
such that the voltage at PFI falls below 1.25V just
before the regulator drops out. Use PFO to interrupt the
P so it can prepare for an orderly power-down.
Regulated and unregulated voltages can be monitored
by simply adjusting the PFI resistive-divider network
values to the appropriate ratio. In addition, the reset
signal can be asserted at voltages other that VCC reset
threshold, as shown in Figure 5. Connect PFO to MR to
initiate a reset pulse when the 12V supply drops below
a user-specified threshold (11V in this example) or
when VCC falls below the reset threshold.
Operation with +3V and +5V Supplies
The MAX706P/R/S/T, the MAX706AP/AR/AS/AT, and the
MAX708R/S/T provide voltage monitoring at the reset
threshold (2.63V to 3.08V) when powered from either
+3V or +5V. These devices are ideal in portable-instru-
ment applications where power can be supplied from
either a +3V battery or an AC-DC wall adapter that gen-
erates +5V (a +5V supply allows a P or a microcon-
troller to run faster than a +3V supply). With a +3V
supply, these ICs consume less power, but output drive
capability is reduced, the MR to RESET delay time
increases, and the MR minimum pulse width increases.
The
Electrical Characteristics table provides specifica-
tions for operation with both +3V and +5V supplies.
Ensuring a Valid
RESET Output Down to
VCC = 0V
When VCC falls below 1V, the MAX706R/S/T,
MAX706AR/AS/AT, and MAX708R/S/T RESET output no
longer sinks current; it becomes an open circuit. High-
impedance, CMOS logic inputs can drift to undeter-
mined voltages if left as open circuit. If a pulldown
resistor is added to the RESET pin , as shown in Figure
6, any stray charge or leakage current will flow to
ground, holding RESET low. Resistor value R is not criti-
cal, but it should not load RESET and should be small
enough to pull RESET and the input it is driving to
ground. 100k
is suggested for R1.
Applications Information
Adding Hysteresis to the Power-Fail
Comparator
Hysteresis adds a noise margin to the power-fail com-
parator and prevents repeated triggering of the PFO
when VIN is near the power-fail comparator trip point.
Figure 7 shows how to add hysteresis to the power-fail
comparator. Select the ratio of R1 and R2 such that PFI
MAX706_
MAX708R/S/T
VCC
GND
PFI
*OPTIONAL
R2
R3
R1
VIN
+3V/+3.3V
C1*
TO
P
PFO
VTRIP = 1.25
(R1 + R2)
R2
PFO
+3V/+3.3V
0V
VH
VH = 1.25 (1 +
R3 + R2
R1) VL = 1.25 + R1
1.25
-
VCC - 1.25
R2
× R3
R2
R3
VTRIP
VIN
VL
MAX706_
MAX708R/S/T
VCC
GND
PFI
R2
R1
+3V/+3.3V
PFO
+3V/+3.3V
0V
NOTE: VTRIP IS NEGATIVE.
0V
VTRIP
V-
VCC - 1.25 = 1.25 - VTRIP
R1
R2
V-
Figure 8. Monitoring a Negative Voltage
Figure 7. Adding Hysteresis to the Power-Fail Comparator
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