MAX16063TG+ Maxim Integrated Products, MAX16063TG+ Datasheet - Page 10

• Manufacturer Part Number: MAX16063TG+
• Description: IC PWR MNTR/OVRVOLT PROT 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX16063TG+

• Applications: Power Supply Monitor, Overvoltage Protection
• Voltage - Supply: 1 V ~ 5.5 V
• Current - Supply: 45µA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1% Accurate, Low-Voltage,
Quad Window Voltage Detector
2) Calculate R3 based on R
3) Calculate R2 based on R
4) Calculate R1 based on R
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
Figure 3. Overvoltage Shutdown Circuit (with External Pass
MOSFET)
10
*OPTIONAL. VALUES OF 10kΩ AND ABOVE ARE RECOMMENDED.
Use the following formulas to calculate the error:
where E
voltage error (in %), respectively.
upper trip point:
desired lower trip point:
V
______________________________________________________________________________________
SUPPLY
E
E
UV
R1
R2
OV
UV
(%) =
( ( %)
and E
R
R
1
R
UVIN_
2
=
3 =
=
I
IB
=
I
IB
R
OV
V
⎛
⎝ ⎜
TOTAL
MAX16063
(
R
V
V
R
V
TH
V
GND
1
TRIPHIGH
TH
V
TRIPLOW
are the undervoltage and over-
2
V
CC
TRIPLOW
+
TRIPHIGH
Overvoltage Shutdown
+
x R
x R
R
UVOUT_
(
TOTAL
R R
2
2
−
TOTAL
1 3
+
TOTAL
x R
TOTAL
R
2
R
TOTAL
1
3
−
, R3, and R2:
))
⎞
⎠ ⎟
R
x
−
x
3
and the desired
R3*
100
100
R
, R3, and the
3
LOAD
powered directly from the system voltage supply. Select
R1 and R2 to set the trip voltage. When the supply volt-
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
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.
Any unused UVIN_ inputs must be connected to V
any unused OVIN_ inputs must be connected to GND.
UVOUT_ and OVOUT_ outputs assert low when UVIN_
and OVIN_, respectively, drop below or exceed their
specified thresholds. The undervoltage/overvoltage out-
puts are open-drain with a (30µA) internal pullup to V
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
internal pullup if interfacing to different logic supply volt-
ages. Internal circuitry prevents reverse current flow from
the external pullup voltage to V
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
Resistor values of 50kΩ to 200kΩ can generally be used.
Figure 4. Overvoltage Shutdown Circuit (with SCR Fuse)
V
SUPPLY
FUSE
R1
R2
UVIN_
UVOUT_ / OVOUT_ Outputs
MAX16063
GND
V
CC
UVOUT_
CC
Unused Inputs
(Figure 5). When
R3
SCR
CC
LOAD
, and
OH
CC
).
.