MAX4971EVKIT+ Maxim Integrated, MAX4971EVKIT+ Datasheet - Page 7

• Manufacturer Part Number: MAX4971EVKIT+
• Description: Power Switch ICs - Power Distribution Overvoltage-Protection Controllers with a Low RON Internal FET
• Manufacturer: Maxim Integrated

Specifications of MAX4971EVKIT+

• On Resistance (max): 90 mOhms
• On Time (max): 13 ms
• Off Time (max): 8 us
• Operating Supply Voltage: 2.2 V to 28 V
• Maximum Power Dissipation: 678 mW

Figure 1. MAX4970/MAX4971/MAX4972 Timing Diagram
Figure 2. Autoretry Timing Diagram
nFET ON
CURRENT
THROUGH
nFET
**ACOK
**ACOK TIMING FOR THE MAX4970/MAX4971.
*ACOK
*ACOK TIMING FOR THE MAX4972.
t
OUT
GP
OFF
t
IN
RETRY
I
LIM
_______________________________________________________________________________________
t
t
ACOK
ACOK
nFET OFF
t
t
INDBC
ACOK
Overvoltage-Protection Controllers
t
ON
10% V
90% V
OUT
OUT
t
OFF
nFET ON
with a Low R
t
t
INDBC
ACOK
Note that the UVLO threshold is measured at IN, but the
input voltage is applied at the drain of the external
pFET. The body diode of the external pFET adds to the
UVLO threshold increasing its value to V
V
source voltage on the external pFET to 7.0V (typ) for
protection of the pFET during an overvoltage fault.
The MAX4970/MAX4971/MAX4972 have a 2.45V under-
voltage-lockout threshold (UVLO). When V
than V
The MAX4970 has a 5.8V (typ) overvoltage thres-
hold (OVLO), the MAX4971 has a 6.35V (typ) OVLO
threshold, and the MAX4972 has a 4.65V (typ) OVLO
threshold. When V
high impedance for the MAX4972.
UVLO
UVLO
. The internal clamp diode limits the gate to
, ACOK is high impedance.
t
t
OFF
OFF
Undervoltage Lockout (UVLO)
ON
Overvoltage Lockout (OVLO)
IN
is greater than V
t
t
t
t
INDBC
OVLO
UVLO
ACOK
ACOK
ACOK
Internal FET
OVLO
BODYDIODE
, ACOK is
IN
is less
7
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