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MAX16010TA_-T

Ultra-Small, Overvoltage Protection/Detection Circuits

Maxim Integrated 

Ultra-Small, Overvoltage Protection/

Detection Circuits

VBATT

R1

VCC

IN+

RPULLUP

R2

REF MAX16012 OUT

OUT

IN-

GND

P1

P2

VBATT

VCC

GATE1

GATE2

R1

MAX16013

SET

R2

GND

Figure 2. Typical Operating Circuit for the MAX16012

Figure 3. Overvoltage Limiter Protection

The MAX16013/MAX16014 can be configured as an

overvoltage switch controller to turn on/off a load (see

the Typical Application Circuit). When the programmed

overvoltage threshold is tripped, the internal fast com-

parator turns off the external p-channel MOSFET (P2),

pulling GATE2 to VCC to disconnect the power source

from the load. When the monitored voltage goes below

the adjusted overvoltage threshold, the MAX16013

enhances GATE2, reconnecting the load to the power

source (toggle ENABLE on the MAX16014 to reconnect

the load). The MAX16013 can be configured as an

overvoltage limiter switch by connecting the resistive

divider to the load instead of VCC (Figure 3). See the

Overvoltage Limiter section.

Supply Voltage

Connect a 5.5V to 72V supply to VCC for proper opera-

tion. For noisy environments, bypass VCC to GND with a

0.1µF or greater capacitor. When VCC falls below the

UVLO voltage the following states are present (Table 1).

Table 1. UVLO State (VCC < VUVLO)

PART OUTA

OUTB

MAX16010 Low Low

OUT GATE2

—

—

MAX16011

Low

Low, LOGIC = low

High, LOGIC = high

—

—

MAX16012 —

—

Low

—

MAX16013

MAX16014

—

—

—

High

Hysteresis

Hysteresis adds noise immunity to the voltage monitors

and prevents oscillation due to repeated triggering

when the monitored voltage is near the threshold trip

voltage. The hysteresis in a comparator creates two trip

points: one for the rising input voltage (VTH+) and one

for the falling input voltage (VTH-). These thresholds are

shown in Figure 4.

Enable Inputs (EN or EN)

The MAX16011 offers an active-high enable input (EN),

while the MAX16010 offers both an active-high enable

input (EN) and active-low enable input (EN). For the

MAX16010, drive EN low or EN high to force the output

low. When the device is enabled (EN = high and EN =

low) the state of OUTA and OUTB depends on INA+

and INB- logic states.

VHYST

VTH+

VIN+

VTH-

VCC

VOUT

0V

tPROP

tPROP

tPROP

Figure 4. Input and Output Waveforms

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