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MAX891LEUA-T
Current-limited 500mA, high-side P-channel switch with thermal shutdown. On-resistance 0.12omega
_______________General DescriptionThe MAX891L/MAX892L smart, low-voltage, P-channel,
MOSFET power switches are intended for high-side
load-switching applications. These switches operate
with inputs from 2.7V to 5.5V, making them ideal for
both 3V and 5V systems. Internal current-limiting circuitry
protects the input supply against overload. Thermal-
overload protection limits power dissipation and junc-
tion temperatures.
The MAX891L/MAX892L’s maximum current limits are
500mA and 250mA, respectively. The current limit
through the switch is programmed with a resistor from
SET to ground. When the switch is on, the quiescent
supply current is a low 13µA. When the switch is off, the
quiescent current decreases to 0.1µA.
The MAX891L/MAX892L are available in 8-pin µMAX
packages.
________________________ApplicationsPCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________FeaturesUltra-Small µMAX Package—Only 1.11mm High2.7V to 5.5V Input RangeProgrammable Current LimitLow 13µAQuiescent Current at VIN= 3.3V,
0.1µA Switch OffThermal ShutdownFAULT
Indicator OutputOn-Resistances:
0.12Ω(MAX891L)
0.25Ω(MAX892L)
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
__________________Pin Configuration
__________Typical Operating Circuit19-1223; Rev 0; 4/97
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 3V, TA
= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND ..................................................................-0.3V to 6VON, FAULTto GND....................................................-0.3V to 6V
SET, OUT to GND........................................-0.3V to (VIN+ 0.3V)
Maximum Continuous Switch Current
MAX891L ..........................................................................0.75A
MAX892L ........................................................................0.375A
Continuous Power Dissipation (TA= +70°C)
µMAX (derate 4.1mW/°C above +70°C) .......................330mW
Operating Temperature Range
MAX891LEUA/MAX892LEUA............................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ...........................+300°C
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
Note 1: Tested with IOUT= 50mA for the MAX891L, 25mA for the MAX892L, and VSETraised until VIN- VOUT‡0.8V.
Note 2:Parameters to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS(VIN= 3V, TA
= -40°C to +85°C,unless otherwise noted.) (Note 2)
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
__________________________________________Typical Operating Characteristics(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
MAX891L/MAX892L
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
______________________________________________________________Pin Description
_______________Detailed DescriptionThe MAX891L/MAX892L P-channel MOSFET power
switches limit output current to a user-programmed
level. When the output current is increased beyond
the set current level, the current is also increased
through the replica switch (IOUT/965) and through
RSET(Figure 1).The current-limit error amplifier com-
pares the voltage across RSETto the internal 1.24V ref-
erence and regulates the current back to the lesser of
the programmed current limit (ILIMIT) or the maximum
current limit (IMAX).
These switches are not bidirectional; therefore, the
input voltage must be higher than the output voltage.
Setting the Current LimitThe MAX891L/MAX892L feature internal current-limit-
ingcircuitry with maximum programmable values
(IMAX) of 500mA and 250mA, respectively. For best
performance, set the current limit (ILIMIT) between
0.2IMAX≤ILIMIT≤IMAX. This current limit remains in
effect throughout the input supply-voltage range.
Program the current limit with a resistor (RSET) from
SET to ground (Figure 2) as follows:
ISET= ILIMIT/ IRATIO
RSET= 1.240 / ISET
where ILIMITis the desired current limit, and IRATIOis
the IOUTto ISETcurrent ratio (965).
Short-Circuit ProtectionThe MAX891L/MAX892L are short-circuit-protected
switches. In the event of an output short circuit or cur-
rent-overload condition, the current through the switch is
limited by the internal current-limiting error amplifier to
1.5 x ILIMIT. When the fault condition is removed, the
replica error amplifier sets the current limit back to
ILIMIT.
For a high DVDS/Dt during an output short-circuit condi-
tion, the switch turns off and disconnects the input sup-
ply from the output. The current-limiting amplifier then
slowly turns the switch on with the output current limited
to 1.5x ILIMIT. When the fault condition is removed, the
current limit is set back to ILIMIT. Refer to the Current-
Limit Response graphs in the Typical Operating
Characteristics.
