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参数资料
| 型号： | MAX16063TG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC PWR MNTR/OVRVOLT PROT 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源监控器，过压保护 |
| 电源电压： | 1 V ~ 5.5 V |
| 电流 - 电源： | 45µA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
1% Accurate, Low-Voltage,
Quad Window Voltage Detector
Use the following formulas to calculate the error:
powered directly from the system voltage supply. Select
R1 and R2 to set the trip voltage. When the supply volt-
I IB ? R 1 +
? R 2 + R 3 ?
E OV ( %) = IB
E UV (%) =
? R 1 R 3 ?
V TRIPLOW
I (R2 + (2 x R1))
V TRIPHIGH
x 100
x 100
age remains below the selected threshold, a low logic
level on UVOUT_ turns on the p-channel MOSFET. In
the case of an overvoltage event, UVOUT_ goes high
turning off the MOSFET, and shuts down the power to
the load.
Figure 4 shows a similar application using a fuse and a
silicon-controlled rectifier (SCR). An overvoltage event
turns on the SCR and shorts the supply to ground. The
where E UV and E OV are the undervoltage and over-
voltage error (in %), respectively.
2) Calculate R3 based on R TOTAL and the desired
upper trip point:
surge of current through the short circuit blows the fuse
and terminates the current to the load. Select R3 so that
the gate of the SCR is properly biased when UVOUT_
goes high.
Unused Inputs
R 3 =
V TH xR TOTAL
V TRIPHIGH
Any unused UVIN_ inputs must be connected to V CC , and
any unused OVIN_ inputs must be connected to GND.
UVOUT_ / O VOUT_ Outputs
3) Calculate R2 based on R TOTAL , R3, and the
desired lower trip point:
UVOUT_ and OVOUT_ outputs assert low when UVIN_
and OVIN_, respectively, drop below or exceed their
specified thresholds. The undervoltage/overvoltage out-
R 2 =
V TH xR TOTAL
V TRIPLOW
? R 3
puts are open-drain with a (30μA) internal pullup to V CC .
For many applications, no external pullup resistor is
required to interface with other logic devices. An external
pullup resistor to any voltage up to 5.5V overdrives the
4) Calculate R1 based on R TOTAL , R3, and R2:
R 1 = R TOTAL ? R 2 ? R 3
Overvoltage Shutdown
The MAX16063 is ideal for overvoltage-shutdown appli-
cations. Figure 3 shows a typical circuit for this applica-
tion using a pass p-channel MOSFET. The MAX16063 is
V SUPPLY
internal pullup if interfacing to different logic supply volt-
ages. Internal circuitry prevents reverse current flow from
the external pullup voltage to V CC (Figure 5). When
choosing the external pullup resistor, the resistance value
should be large enough to ensure that the output can sink
the necessary current during a logic-low condition and
small enough to be able to overdrive the internal pullup
current and meet output high specifications (V OH ).
Resistor values of 50k ? to 200k ? can generally be used.
FUSE
V SUPPLY
R1
V CC
UVIN_
LOAD
V CC
LOAD
R2
MAX16063
R3*
R1
MAX16063
R3
SCR
UVIN_
GND
UVOUT_
R2
UVOUT_
GND
*OPTIONAL. VALUES OF 10k ? AND ABOVE ARE RECOMMENDED.
Figure 3. Overvoltage Shutdown Circuit (with External Pass
MOSFET)
Figure 4. Overvoltage Shutdown Circuit (with SCR Fuse)
10
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