Detailed Description

The MAX14736/MAX14737 overvoltage-protection (OVP)

devices guard battery-powered modules in portable devices

against overvoltage faults. The low, 15mΩ (typ) on-resistance,

as well as the low 13µA (typ) quiescent supply current of the

devices minimize power consumption, making them an excel-

lent choice for low-power systems. Additionally, the devices

feature a precision overvoltage-lockout (OVLO) threshold,

ultra-fast response time, and surge suppression to ±35V,

which serve to provide excellent protection against even high-

slew rate, high-voltage transients.

The integrated power transistor in the devices is a

p-channel device, but the intrinsic body diode from OUT

to IN is removed through appropriate design techniques.

Consequently, when the switch is in the off state, reverse-

current blocking is inherent to the devices. The devices

feature a push-pull POK output that is driven low if either

an overvoltage, undervoltage, or thermal fault is detected;

or if the device is placed into shutdown mode.

The MAX14736 has an active-low enable pin (EN), while

the enable pin (EN) on MAX14737 is active-high. When

driven to the active state, the device is enabled. When driven

to the inactive state, the device is placed in a low-power

shutdown mode and the switch is kept in the off state.

Device Operation

The devices contain timing logic that controls the turn-

on of the internal FET. When the device is enabled and

is powered. After 15ms of debounce time, which prevents

false turn-on of the FET during startup, the soft-start function

limits inrush current through the FET for 30ms (typ).

disconnected from IN.

IN

OUT

GND

TIMING AND

CONTROL

LOGIC

GATE DRIVER

TEMPERATURE

FAULTS

IN

OUT

IN

OUT

EN

MAX14736/MAX14737

POK

POK

IN

OUT

IDEAL DIODES

(EN)*

* EN for MAX14736

EN for MAX14737

MAX14736/MAX14737

Precision, Ultra-Fast, Low Supply Current,

Bidirectional Overvoltage Protector

www.maximintegrated.com

Maxim Integrated │ 8

Functional Diagram