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MAX893LESA-MAX893L-ESA
1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown
General DescriptionThe MAX893L smart, low-voltage, P-channel, MOSFET
power switch is intended for high-side load-switching
applications. This switch operates with inputs from
+2.7V to +5.5V, making it ideal for both +3V and +5V
systems. Internal current-limiting circuitry protects the
input supply against overload. Thermal overload pro-
tection limits power dissipation and junction tempera-
ture.
The MAX893L’s maximum programmed current limit is
1.2A. The typical short-circuit current is 1.5 times the
programmed current; therefore, a 1.2A programmed
limit will result in a 1.8A short-circuit current limit. The
current limit through the switch is programmed with a
resistor from SET to ground. The quiescent supply cur-
rent is a low 13μA. When the switch is off, the supply
current decreases to 0.1μA.
The MAX893L is available in an 8-pin SO package.
________________________ApplicationsUSB Ports
USB Hubs
PCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________Features+2.7V to +5.5V Input RangeProgrammable Current Limit
0.2A to 1.2A Range
±20% Accuracy1.2A Continuous Load Current1.8A Short-Circuit CurrentLow Quiescent Current
13μA at VIN= 3.3V
0.1μAwith Switch OffThermal ShutdownFAULT
Indicator Output0.07ΩOn-Resistance
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Pin Configuration
Typical Operating Circuit19-1450; Rev 0; 7/99
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch 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 Short-Circuit Switch Current .............2.0A
Continuous Power Dissipation (TA= +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
Operating Temperature Range
MAX893LESA...................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
ELECTRICAL CHARACTERISTICS(VIN= 3V, TA
= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 1:Tested with IOUT= 100mA and VSETraised until VIN- VOUT‡0.8V.
Note 2:Specifications to -40°C are guaranteed by design, not production tested.
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown OFF-SWITCH CURRENT
vs. TEMPERATURE
MAX893L toc04
TEMPERATURE (°C)
OFF-SWITCH CURRENT (nA)
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX893L toc05
TEMPERATURE (°C)
NORMALIZED R
ON
IOUT/ISET RATIO
vs. ILIMIT
MAX89L toc06
ILIMIT (%)
IOUT
SET
RATIO100120
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX893L toc07
OUTPUT VOLTAGE (V)
NORMALIZED OUTPUT CURRENT23456
TURN-ON TIME
vs. TEMPERATURE
MAX893L toc08
TEMPERATURE (°C)
TURN-OFF TIME
vs. TEMPERATURE
MAX893L toc09
TEMPERATURE (°C)
tOFF
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX893L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Pin Description
Detailed DescriptionThe MAX893L P-channel MOSFET power switch limits
output current to a programmed level. When the output
current is increased beyond the programmed current
limit, or 1.2A (IMAX), the current also increases through
the replica switch (IOUT / 1080) and through RSET
(Figure 1). The current-limit error amplifier compares
the voltage across RSETto the internal 1.24V reference,
and regulates the current to the programmed current
limit (ILIMIT).
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
Setting the Current LimitThe MAX893L features internal current-limiting circuitry
with a maximum programmable value (IMAX) of 1.2A.
For best performance, set the current limit (ILIMIT)
between 0.2A ≤ILIMIT≤1.2A. 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 / 1080
RSET= 1.24V / ISET = 1.34 ·103 / ILIMIT
where ILIMITis the desired current limit.
Short-Circuit ProtectionThe MAX893L is a short-circuit protected switch. In the
event of an output short circuit or a current overload
condition, the current through the switch is limited by
the internal current-limiting error amplifier to 1.5 ·ILIMIT.
The short-circuit current is typically 1.8A for a pro-
grammed current limit of 1.2A. When the short-circuit
condition is removed, the replica error amplifier will set
the current limit back to ILIMIT.
For a high ΔVDS/Δt during an output short-circuit condi-
tion, the switch turns off and disconnects the input supply
from the output. The current-limiting amplifier then slow-
ly turns the switch on with the output current limited to
1.5 ·ILIMIT. When the short-circuit condition is removed,
the current limit is set back to ILIMIT. See Output Short-
Circuit (Fast-Loop Response) and Output Overload
(Slow-Loop Response) in the Typical Operating
Characteristics.
