MAX14527 Datasheet, PDF (5/7 Pages) Maxim Integrated Products – Adjustable Overvoltage Protector with High Accuracy

Adjustable Overvoltage Protector
with High Accuracy
Pin Description
PIN
NAME
FUNCTION
Voltage Input. Bypass IN with a 1µF ceramic capacitor as close as possible to the device to obtain ±15kV
1, 2
IN Human Body Model (HBM) ESD protection. Connect all the IN pins together for proper operation. IN is
protected to ±2kV HBM when IN is not bypassed with a capacitor to GND.
External OVLO Adjustment. Connect OVLO to GND when using the internal threshold. Connect a resistor-
3
OVLO divider to OVLO to set a different OVLO threshold; this external resistor-divider is completely independent
from the internal threshold.
4, 5
I.C. Internally Connected. Do not connect. Leave I.C. unconnected.
6
GND Ground
7, 8
OUT Output Voltage. Output of internal switch. Connect all the OUT outputs together for proper operation.
—
EP
Exposed Pad. Connect exposed pad to ground. For enhanced thermal dissipation, connect EP to a copper
area as large as possible. Do not use EP as a sole ground connection.
Functional Diagram
IN
OUT
IN
OUT
CHARGE
PUMP
V_BG
REFERENCE
TEMPERATURE
FAULTS
+
-
LOGIC
CONTROL
OVLO
SEL
GND
MAX14527
MAX14528
Detailed Description
The MAX14527/MAX14528 overvoltage protection
devices feature a low R_ON internal FET and protect low-
voltage systems against voltage faults up to +28V. If
the input voltage exceeds the overvoltage threshold,
the internal FET is turned off to prevent damage to the
protected components. The 15ms debounce time pre-
vents false turn-on of the internal FET during startup.
Device Operation
The MAX14527/MAX14528 have timing logic that
controls the turn-on of the internal FET. If V_IN <
V_{OVLO_THRESH}, the internal charge pump is enabled.
The charge-pump startup, after a 15ms debounce
delay, turns on the internal FET (see the Functional
Diagram). At any time, if V_IN rises above V_{OVLO_}
THRESH^{, OUT is disconnected from IN.}
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