MAX4945AELA+T Maxim Integrated Products, MAX4945AELA+T Datasheet - Page 7

• Manufacturer Part Number: MAX4945AELA+T
• Description: IC CTLR OVP W/FET 5.80V 8-UDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX4945AELA+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX4945AELA+T; MAX4945AELA+TTR

When the input voltage goes above ground, GP pulls
low and turns on the pFET. An internal clamp protects
the pFET by ensuring that the GP to IN voltage does not
exceed 19V (max) when the input (IN) rises to +28V.
The MAX4944L/MAX4945L/MAX4946/MAX4949 have a
2.45V (typ) undervoltage-lockout threshold (V
while the remaining devices have a 4.15V (typ) V
threshold. When V
impedance.
The MAX4943 has a 7.4V (typ) overvoltage threshold
(V
threshold, the MAX4945_ has a 5.80V (typ) V
threshold, the MAX4946 has a 4.56V (typ) V
threshold, and the MAX4949 has a 8.90V (typ) V
threshold. When V
high impedance.
ACOK is an active-low, open-drain output that asserts
low when V
od. Connect a pullup resistor from ACOK to the logic
I/O voltage of the host system. During a short-circuit
fault, ACOK may deassert due to V
valid operating voltage range.
The MAX4943–MAX4946/MAX4949 feature thermal-shut-
down circuitry. The internal switch turns off when the junc-
tion temperature exceeds +175°C (typ) and immediately
goes into a fault mode. The device exits thermal shut-
down after the junction temperature cools by 40°C (typ).
For most applications, bypass IN to GND with a 1µF
ceramic capacitor as close as possible to the device to
enable ±15kV (HBM) ESD protection on the pin. If
±15kV is not required, there is no capacitor required at
IN. If the power source has significant inductance due
to long lead length, take care to prevent overshoots
due to the LC tank circuit and provide protection if nec-
essary to prevent exceeding the +30V absolute maxi-
mum rating on IN.
The optional external pFET can provide reverse polarity
protection down to -28V (for a 30V pFET), if the protect-
OVLO
Overvoltage-Lockout Thresholds (OVLO)
), the MAX4944_ has a 6.35V (typ) V
UVLO
Applications Information
Undervoltage Lockout (UVLO)
Thermal-Shutdown Protection
< V
_______________________________________________________________________________________
IN
Overvoltage-Protection Controllers with
IN
Reverse Polarity Protection
IN
is less than V
is greater than OVLO, ACOK is
< V
OVLO
IN Bypass Capacitor
for the 30ms (typ) peri-
UVLO
GP GATE Drive
IN
not being in the
, ACOK is high
ACOK
UVLO
OVLO
OVLO
OVLO
OVLO
UVLO
),
Figure 3. Autoretry Timing Diagram
Figure 4. Human Body ESD Test Model
Figure 5. Human Body Current Waveform
AMPERES
SWITCH ON
CURRENT
THROUGH
SWITCH
VOLTAGE
SOURCE
HIGH-
DC
I
P
36.8%
100%
90%
10%
CHARGE-CURRENT-
0
LIMIT RESISTOR
0
t
OFF
1MΩ
t
R
RL
t
RETRY
C
100pF
I
LIM
C s
STORAGE
CAPACITOR
CURRENT WAVEFORM
Internal FET
TIME
SWITCH OFF
RESISTANCE
DISCHARGE
1.5kΩ
R
D
t
DL
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
DEVICE
UNDER
SWITCH ON
TEST
7