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MAX890LESA
1A / 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 sup-
ply against overload. Thermal-overload protection limits
power dissipation and junction temperatures.
The MAX890L’s maximum current limit is 1A. The cur-
rent limit through the switch is programmed with a
resistor from SET to ground. The quiescent supply cur-
rent is a low 10mA. When the switch is off, the supply
current decreases to 0.1mA.
The MAX890L is available in an 8-pin SO package.
________________________ApplicationsPCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________Features2.7V to 5.5V Input RangeProgrammable Current LimitLow Quiescent Current
10mA (typ) at VIN= 3.3V
0.1mA (typ) with Switch OffThermal ShutdownFAULT
Indicator Output0.09Ω(typ) On-Resistance
MAX890L
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Pin Configuration
Typical Operating Circuit19-1146; Rev 2; 11/98
MAX890L
1A, 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 6V
ON, 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, 10sec) ............................+300°C
Note 1:Tested with IOUT= 100mA and VSETraised until VIN- VOUT‡0.8V.
MAX890L
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
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
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX890L
1A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX890L
1A, 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 1A (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 reference,
and regulates the current back to the lesser of the pro-
grammed limit (ILIMIT) or 1A.
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 1A. 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 Short-Circuit
Slow-Loop Response in the Typical Operating
Characteristics.
