User Manual

source has significant inductance due to long lead
length, take care to prevent overshoots due to the LC
tank circuit, and provide protection if necessary to pre-
vent exceeding the 30V absolute maximum rating on IN.
The MAX4881–MAX4884 provide protection against
voltage faults up to 28V, but this does not include neg-
ative voltages. If negative voltages are a concern, con-
nect a Schottky diode from IN to GND to clamp
negative input voltages.
Exposed Pad
The MAX4881–MAX4884 provide an exposed pad on the
bottom of the package. This pad is internally connected
to GND. For the best thermal conductivity and higher
power dissipation, solder the exposed pad to the ground
plane. Do not use the ground-connected pad as the only
MAX4881–MAX4884
Overvoltage Protection Controllers with
Current Limit in TDFN
10 ______________________________________________________________________________________
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
150pF
R
C
50Ω to 100Ω
R
D
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 10. IEC 61000-4-2 ESD Test Model
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
100pF
R
C
1MΩ
R
D
1.5kΩ
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 8. 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)
I
r
10%
0
0
AMPERES
Figure 9. Human Body Model Current Waveform
t
r
= 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
I
PEAK
I
Figure 11. IEC 61000-4-2 ESD Generator Current
PART
CONFIGURATION/
PACKAGE
V
DS
MAX (V)
R
ON
AT 4.5V (mΩ)
MANUFACTURER
Si1426DH Single/SC70-6 30 115
Vishay Siliconix
http://www.vishay.com
[phone]
FDG315N Single/SC70-6 30 160
Fairchild Semiconductor
http://www.fairchildsemi.com
[phone]
Table 1. MOSFET Suggestions