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MAX16010TA_-T

Ultra-Small, Overvoltage Protection/Detection Circuits

Maxim Integrated 

Ultra-Small, Overvoltage Protection/

Detection Circuits

+48V

R1

R2

R3

EN

VCC

INA+

OUTA

OUTB

MAX16010

INB-

GND EN

IN

EN DC-DC

REGULATOR

Figure 1. MAX16010 Monitor Circuit

Detailed Description

The MAX16010–MAX16014 is a family of ultra-small, low-

power, overvoltage protection circuits for high-voltage,

high-transient systems such as those found in automo-

tive, telecom, and industrial applications. These devices

operate over a wide 5.5V to 72V supply voltage range,

making them also suitable for other applications such as

battery stacks, notebook computers, and servers.

The MAX16010 and MAX16011 offer two independent

comparators for monitoring both undervoltage and

overvoltage conditions. These comparators offer open-

drain outputs capable of handling voltages up to 72V.

The MAX16010 features complementary enable inputs

(EN/EN), while the MAX16011 features an active-high

enable input and a selectable active-high/low OUTB

output.

The MAX16012 offers a single comparator and an inde-

pendent reference output. The reference output can be

directly connected to either the inverting or noninvert-

ing input to select the comparator output logic.

The MAX16013 and MAX16014 are overvoltage protec-

tion circuits that are capable of driving two p-channel

MOSFETs to prevent reverse battery and overvoltage

conditions. One MOSFET (P1) eliminates the need for

external diodes, thus minimizing the input voltage drop.

While the second MOSFET (P2) isolates the load or reg-

ulates the output voltage during an overvoltage condi-

tion. The MAX16014 keeps the MOSFET (P2) latched

off until the input power is cycled.

Voltage Monitoring

The MAX16010/MAX16011 include undervoltage and

overvoltage comparators for window detection (see

Figure 1). OUT_ asserts high when the monitored volt-

age is within the selected “window.” OUTB asserts low

when the monitored voltage falls below the lower

(VTRIPLOW) limit of the window, or OUTA asserts low if

the monitored voltage exceeds the upper limit

(VTRIPHIGH). The application in Figure 1 shows OUT_

enabling the DC-DC converter when the monitored volt-

age is in the selected window.

The resistor values R1, R2, and R3 can be calculated

as follows:

VTRIPLOW

=

VTH−

⎛

⎝⎜

R TOTAL

R2 + R3

⎞

⎠⎟

VTRIPHIGH

=

VTH+

⎛

⎝⎜

R

TOTAL

R3

⎞

⎠⎟

where RTOTAL = R1 + R2 + R3.

Use the following steps to determine the values for R1,

R2, and R3.

1) Choose a value for RTOTAL, the sum of R1, R2, and

R3. Because the MAX16010/MAX16011 have very

high input impedance, RTOTAL can be up to 5MΩ.

2) Calculate R3 based on RTOTAL and the desired

upper trip point:

R3 = VTH+ × RTOTAL

VTRIPHIGH

3) Calculate R2 based on RTOTAL, R3, and the desired

lower trip point:

R2 = VTH− × RTOTAL − R3

VTRIPLOW

4) Calculate R1 based on RTOTAL, R3, and R2:

R1 = RTOTAL - R2 - R3

The MAX16012 has both inputs of the comparator avail-

able with an integrated 1.30V reference (REF). When the

voltage at IN+ is greater than the voltage at IN- then OUT

goes high. When the voltage at IN- is greater than the

voltage at IN+ then OUT goes low. Connect REF to IN+

or IN- to set the reference voltage value. Use an external

resistive divider to set the monitored voltage threshold.

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