Rainbow Electronics MAX4981 - Manual (Page 9)

Human Body Model
Figure 3 shows the Human Body Model, and Figure 4
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 inter-
est that is then discharged into the device through a
1.5kΩ resistor.
Chip Information
PROCESS: BiCMOS
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
_______________________________________________________________________________________ 9
OUT IN
CONTROL
LOGIC
MAX4978/
MAX4979
BANDGAP
REFERENCE
5V AC
ADAPTER
C0NTROL
CHARGER
CHARGE
PUMP
+
-
+
-
OVLO
UVLO
1 μF
EN
GND
1k Ω
SDT
PHONE
LOADS AC-DC
CONVERTER
~0.5 Ω
LONG WIRE
RESISTANCE
nFET
Figure 2. Typical Application Circuit with SDT
CHARGE CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR Cs
100pF
R
C
1M Ω
R
D
1.5k Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 3. Human Body ESD Test Model
I P 100%
90%
36.8%
t
RL
TIME
t DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE) Ir
10%
0
0
AMPERES
Figure 4. Human Body Current Waveform