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3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
configured in automatic retry mode (see MOSFET
Thermal Considerations ) .
Using the MAX4271/MAX4273 in latched mode allows
the consideration of MOSFETs with higher R DS(ON) and
lower power ratings. A MOSFET can typically withstand
single-shot pulses with higher dissipation than the
specified package rating. Low MOSFET gate capaci-
tance is not necessary since the inrush current limiting
is achieved by limiting the gate dv/dt. Table 3 lists
some recommended manufacturers and components.
Sense Resistor
The slow comparator threshold voltage is set at 50mV.
Select a sense resistor that causes a 50mV voltage
drop at a current level above the maximum normal
operating current; typically, set the overload current at
1.2 to 1.5 times the nominal load current. The fast com-
parator threshold is typically set at 200mV. This will set
the fault current limit at four times the overload current
Fast Comparator Threshold (RTH) (MAX4273)
The fast comparator threshold is determined by the
external resistor connected at RTH. To select threshold
voltages between 50mV and 750mV, use resistor val-
ues between 5k Ω and 75k Ω according to Figure 7.
Resistor values between 200 Ω and 5k Ω are not recom-
mended. Setting the threshold voltage of the fast com-
parator below 50mV will effectively override the slow
comparator operation. The MAX4273 fast comparator
can be disabled by shorting the RTH pin to V IN (V IN -
25mV or less). Ground RTH to set the threshold to
200mV internally.
Startup and Retry Timers (CTIM, CTON)
The startup (t START ) and retry (t RETRY ) timers are deter-
mined by the capacitors connected at CTIM and
CTON. The capacitor connected to CTIM has two func-
tions for the three devices as follows:
limit. The MAX4273 fast comparator threshold can be
set between 50mV and 750mV; see Table 4 for a
detailed listing.
Choose the sense resistor power rating according to
the device configuration. If no retry mode is selected,
P RSENSE = (I OVERLOAD ) 2 x R SENSE ; if retry is selected,
then P RSENSE = (I FAULT ) 2 x R SENSE x (t ON /t RETRY ).
Table 3. Component Manufacturers
DEVICE
MAX4271
MAX4272
MAX4273
CTIM FUNCTION
Startup time
Startup time and sets retry timer
Sets retry timer
COMPONENT
Sense Resistors
MOSFETS
MANUFACTURER
Dale-Vishay
IRC
Fairchild
International Rectifier
Motorola
PHONE
402-564-3131
704-264-8861
888-522-5372
310-322-3331
602-244-3576
WEB
www.vishay.com
www.irctt.com
www.fairchildsemi.com
www.irf.com
www.mot-sps.com/ppd/
Table 4. Current Levels vs. R SENSE
R SENSE (m Ω )
10
50
100
PART NUMBER
MAX4271/MAX4272
MAX4273
MAX4271/MAX4272
MAX4273
MAX4271/MAX4272
MAX4273
OVERLOAD THRESHOLD
SET BY SLOW COMPARATOR (A)
5
5
1
1
0.5
0.5
FAULT CURRENT THRESHOLD
SET BY FAST COMPARATOR (A)
20
5 to 75
4
1 to 15
2
0.5 to 7.5
16
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