MAX4273EEE Maxim Integrated Products, MAX4273EEE Datasheet - Page 16

• Manufacturer Part Number: MAX4273EEE
• Description: IC CTRLR 3-12V HOTSWAP 16-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX4273EEE

• 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: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

configured in automatic retry mode (see MOSFET
Thermal Considerations).
Using the MAX4271/MAX4273 in latched mode allows
the consideration of MOSFETs with higher R
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.
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
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
then P
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
Table 3. Component Manufacturers
Table 4. Current Levels vs. R
16
Sense Resistors
MOSFETS
RSENSE
R
SENSE
______________________________________________________________________________________
RSENSE
100
10
50
COMPONENT
= (I
(mΩ)
OVERLOAD
= (I
FAULT
MAX4271/MAX4272
MAX4273
MAX4271/MAX4272
MAX4273
MAX4271/MAX4272
MAX4273
)
)
PART NUMBER
2
2
x R
x R
SENSE
SENSE
Dale-Vishay
IRC
Fairchild
International Rectifier
Motorola
MANUFACTURER
; if retry is selected,
x (t
SENSE
Sense Resistor
ON
/t
RETRY
DS(ON)
SET BY SLOW COMPARATOR (A)
).
OVERLOAD THRESHOLD
and
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 5kΩ and 75kΩ according to Figure 7.
Resistor values between 200Ω and 5kΩ 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
25mV or less). Ground RTH to set the threshold to
200mV internally.
The startup (t
mined by the capacitors connected at CTIM and
CTON. The capacitor connected to CTIM has two func-
tions for the three devices as follows:
0.5
0.5
5
5
1
1
MAX4271
MAX4272
MAX4273
402-564-3131
704-264-8861
888-522-5372
310-322-3331
602-244-3576
DEVICE
Fast Comparator Threshold (RTH) (MAX4273)
PHONE
START
Startup and Retry Timers (CTIM, CTON)
) and retry (t
Startup time
Startup time and sets retry timer
Sets retry timer
SET BY FAST COMPARATOR (A)
FAULT CURRENT THRESHOLD
www.vishay.com
www.irctt.com
www.fairchildsemi.com
www.irf.com
www.mot-sps.com/ppd/
CTIM FUNCTION
RETRY
0.5 to 7.5
5 to 75
1 to 15
20
) timers are deter-
4
2
WEB
IN
(V
IN
-