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MAX890L
1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown
General DescriptionThe MAX890L 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-
tures.
The MAX890L’s maximum current limit is 1.2A. The cur-
rent limit through the switch is programmed with a
resistor from SET to ground. The quiescent supply cur-
rent is a low 10µA. When the switch is off, the supply
current decreases to 0.1µA.
The MAX890L is available in an 8-pin SO package.
________________________ApplicationsPCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________Features+2.7V to +5.5V Input RangeProgrammable Current LimitLow Quiescent Current
10µA (typ) at VIN= +3.3V
0.1µA (typ) with Switch OffThermal ShutdownFAULT
Indicator Output0.09Ω(typ) On-Resistance
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Pin Configuration
Typical Operating Circuit19-1146; Rev 3; 3/00
MAX890L
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 Switch Current ..................................1.5A
Continuous Power Dissipation (TA= +70°C)
SO (derate 5.88mW/°C above +70°C) ..........................471mW
Operating Temperature Range
MAX890LESA....................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
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.
ELECTRICAL CHARACTERISTICS(VIN= +3V, TA
= -40°C to +85°C,unless otherwise noted.) (Note 2)
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown OFF-SWITCH CURRENT
vs. TEMPERATURE
MAX890 toc04
TEMPERATURE (°C)
OFF-SWITCH CURRENT (nA)
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX890 toc05
TEMPERATURE (°C)
NORMALIZED R
ON
IOUT/ISET RATIO
vs. ILIMIT
MAX890 toc06
ILIMIT (%)
IOUT
SET
RATIO100120
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX890 toc07
OUTPUT VOLTAGE (V)
NORMALIZED OUTPUT CURRENT23456
TURN-ON TIME
vs. TEMPERATURE
MAX890 toc08
TEMPERATURE (°C)
tON180
TURN-OFF TIME
vs. TEMPERATURE
MAX890 toc09
TEMPERATURE (°C)
tOFF
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Pin Description
Detailed DescriptionThe MAX890L 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/1110) and through RSET
(Figure 1). The current-limit error amplifier compares
the voltage across RSETto the internal +1.24V refer-
ence, and regulates the current back to the lesser of
the programmed limit (ILIMIT) or 1.2A.
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
Setting the Current LimitThe MAX890L features internal current-limiting circuitry
with a maximum programmable value (IMAX) of 1.2A.
For best performance, set the current limit (ILIMIT)
between 0.2 IMAX≤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/ 1110
RSET= 1.24V / I8 = 1.38 x 103/ ILIMIT
where ILIMITis the desired current limit.
Short-Circuit ProtectionThe MAX890L is a short-circuit-protected switch. In the
event of an output short circuit or current-overload con-
dition, 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 will set 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 supply
from the output. The current-limiting amplifier then slow-
ly turns the switch on with the output current limited to
1.5 x ILIMIT. When the fault condition is removed, the
current limit is set back to ILIMIT. Refer to Output Short-
Circuit Fast-Loop Response and Output Over-Load
