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MAX4943ELAT

Overvoltage-Protection Controllers with Internal FET

Maxim Integrated 

Overvoltage-Protection Controllers with

Internal FET

ed device does not allow current to flow into OUT. The

pFET is turned off when the voltage between GP and IN

is less than the pFET gate threshold voltage.

ESD Test Conditions

ESD performance depends on a number of conditions.

The MAX4943–MAX4946/MAX4949 are specified for

±15kV (HBM) typical ESD resistance on IN when IN is

bypassed to ground with a 1µF ceramic capacitor.

Human Body Model

Figure 4 shows the Human Body Model and Figure 5

shows the current waveform it generates when dis-

charged into a low impedance. This model consists of a

100pF capacitor charged to the ESD voltage of interest,

which is then discharged into the device through a

1.5kΩ resistor.

IEC 61000-4-2

The IEC 61000-4-2 standard covers ESD testing and

performance of finished equipment. It does not specifi-

cally refer to integrated circuits. The MAX4943–

MAX4946/MAX4949 are specified for ±15kV Air-Gap

Discharge and ±8kV Contact Discharge IEC 61000-4-2

on the IN pin when IN is bypassed to ground with a 1µF

ceramic capacitor.

The major difference between tests done using the

Human Body Model and IEC 61000-4-2 is a higher peak

current in IEC 61000-4-2, due to lower series resistance.

RC

50MΩ TO 100MΩ

RD

330Ω

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

150pF

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

Figure 6. IEC 61000-4-2 ESD Test Model

Hence, the ESD withstand voltage measured to IEC

61000-4-2 generally is lower than that measured using the

Human Body Model. Figure 6 shows the IEC 61000-4-2

model. The Contact Discharge method connects the

probe to the device before the probe is charged. The

Air-Gap Discharge test involves approaching the device

with a charged probe.

PROCESS: BiCMOS

Chip Information

Typical Operating Circuit

5V AC

ADAPTER

1μF

GP

IN

VI/0

OUT

TO μC

ACOK

15ms (typ)

DEBOUNCE

CHARGE

PUMP

30ms (typ)

TIMER

GND

MAX4943–MAX4946/MAX4944L/

MAX4945L/MAX4949

CHARGER

DC-DC

CONVERTER

8 _______________________________________________________________________________________

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