Rainbow Electronics MAX4987BE - Manual (Page 8)

MAX4987AE/MAX4987BE
are specified for ±15kV Air-Gap Discharge and ±6kV
Contact Discharge IEC 61000-4-2 on the CD+ and CD-
pins.
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.
Hence, the ESD withstand voltage measured to IEC
61000-4-2 generally is lower than that measured using
the Human Body Model. Figure 5 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.
Overvoltage-Protection Controller
with USB ESD Protection
8 _______________________________________________________________________________________
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR Cs
150pF
R C
50M Ω TO 100MΩ
R D
330 Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 5. IEC 61000-4-2 ESD Test Model
OVERCURRENT
FAULT
IN
CD+
CD-
OUT
V CC
CHARGE
PUMP
CONTROL
LOGIC
MAX4987AE/
MAX4987BE
ACOK
V IO
PHONE
LOAD
V BG
REFERENCE
+
-
+
-
OV
UV
EN
USB
CONNECTOR
VBUS
D+
D-
USB
TRANSCEIVER
V CC
D+
D-
GND
V CC
BATTERY
CHARGER
Typical Operating Circuit
Chip Information
PROCESS: BiCMOS