Rainbow Electronics MAX14528 - Manual (Page 5)

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.
MAX14527/MAX14528
Adjustable Overvoltage Protector
with High Accuracy
_______________________________________________________________________________________ 5
Pin Description
Functional Diagram
OUT
OUT
IN
IN
OVLO
GND
CHARGE
PUMP
LOGIC
CONTROL
SEL
V BG
REFERENCE
+
-
TEMPERATURE
FAULTS
MAX14527
MAX14528
PIN NAME FUNCTION
1, 2 IN
Voltage Input. Bypass IN with a 1µF ceramic capacitor as close as possible to the device to obtain ±15kV
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.
3 OVLO
External OVLO Adjustment. Connect OVLO to GND when using the internal threshold. Connect a resistor-
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.