MAX14527 查看數據表（PDF） - Maxim Integrated

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MAX14527

Adjustable Overvoltage Protector with High Accuracy

Maxim Integrated 

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

VBG

REFERENCE

TEMPERATURE

FAULTS

+

-

LOGIC

CONTROL

OVLO

SEL

GND

MAX14527

MAX14528

Detailed Description

The MAX14527/MAX14528 overvoltage protection

devices feature a low RON 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 VIN <

VOVLO_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 VIN rises above VOVLO_

THRESH, OUT is disconnected from IN.

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