MAX4271ESA+ Maxim Integrated Products, MAX4271ESA+ Datasheet - Page 18

• Manufacturer Part Number: MAX4271ESA+
• Description: IC CNTRLR HOT SWAP 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX4271ESA+

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 2.7 V ~ 13.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Product: Controllers & Switches
• Supply Voltage (max): 13.2 V
• Supply Voltage (min): 2.7 V
• Power Dissipation: 471 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
Table 6. “No-Overcurrent” Turn-On Timing (Startup Without Current Limit)
Figure 8. Startup and Retry Timeout
Case B. Startup With Current Regulation
In applications where the board capacitance (C
at V
drop across R
threshold (V
C
time is determined by:
where the maximum load current I
R
grams for a startup transient with current regulation. (See
Startup Time (C
Characteristics.) When operating under this condition, an
external gate capacitor is not required. Adding an exter-
nal gate capacitor at GATE to GND reduces the regulat-
18
Fairchild FDS6670A
International Rectifier
IRF7401
Motorola MMSF5N03HD
SENSE
BOARD
OUT
______________________________________________________________________________________
. Figure 3 shows the waveforms and timing dia-
10,000
1000
is high, the inrush current causes a voltage
can be considered constant and the turn-on
0.01
100
0.1
DEVICE
10
1
t
0.01
FC,TH
ON
SENSE
t
RETRY
BOARD
= C
). In this case, the current charging
0.1
vs. CTIM (MAX4272/MAX4273)
BOARD
t
that exceeds the fast comparator
ON
CTON AND CTIM
t
t
= 470µF) in the Typical Operating
ON
ON
CAPACITANCE (nF)
AND t
vs. CTIM (MAX4271/MAX4272)
vs. CTON (MAX4273)
1
✕
RETRY
V
C
IN
10
GATE
(nF)
22
22
22
0
0
0
/ I
vs.
FAST,SET
FAST,SET
100
V
1000
IN
0.175
0.101
0.22
2.3
1.9
2.0
= 3V
= V
BOARD
FC,TH
MOSFET t
V
)
/
IN
0.130
0.074
0.16
1.8
1.8
2
= 5V
ON
ed current ripple but increases t
gate delay (t
The actual startup time is determined by the longer of
the two timings of Case A and Case B. Set the startup
timer t
the output voltage to settle; also take into consideration
device parameter variation.
The retry timer defines the dead time before the IC tries
to restart a startup sequence following a fault detection.
This feature is available on the MAX4272/MAX4273.
Before selecting the retry timer value, determine how
long a temporary high-current fault condition may be
present. In the event of a permanent fault, the automat-
ic retry will effectively force current pulses through the
Figure 9. Operation with an External Capacitor
(ms)
R
PULLUP
V
V
START
C
IN
IN
SPD
0.073
*OPTIONAL (SEE TEXT)
0.19
0.16
3.2
3.5
3.2
= 12V
d
) (Figure 4).
at 2
STAT
ON
CSPD
IN
✕
V
IN
0.075
0.033
0.470
t
0.07
0.54
0.54
R
ON
SENSE
= 3V
MAX4271
MAX4272
MAX4273
to guarantee enough time for
GND
SENSE
MOSFET t
V
GATE
M1
OFF
IN
0.067
0.13
0.13
1.1
1.1
1.0
CTIM
= 5V
R
S
OFF
*
by increasing the
(ms)
V
OUT
C
C
GATE
V
C
TIM
BOARD
IN
0.145
0.085
1.95
0.16
1.95
2.0
= 12V
Retry