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MAX869LEEE
2A / Current-Limited / High-Side P-Channel Switch with Thermal Shutdown
_______________General DescriptionThe MAX869L P-channel load switch features an accu-
rate user-set current limit and low on-resistance. This
switch is designed to protect your power source from
shorts and surges by limiting current and preventing
the system supply from being pulled low. The input volt-
age range is 2.7V to 5.5V.
The MAX869L features a 2A, 45mΩswitch controlled
by a logic signal. Current-limit accuracy is ±21%, and
can be set from 400mA to 2.4A using a single resistor.
The device has a low 12µA quiescent supply current,
which reduces to 2µA max in shutdown. It features ther-
mal-shutdown protection and a logic-signal output pin
(FAULT) that signals when there is an overcurrent or
overtemperature condition.
For other devices in this family, consult the Selector
Guide.
________________________ApplicationsUniversal Serial Bus (USB)
Notebook Computers
Personal Communicators
Palmtop Computers
Hand-Held Instruments
Portable Medical Instruments
____________________________FeaturesVery Small Footprint (16-pin QSOP is the same
size as an 8-pin SO)Low Resistance: 45mΩat 3V±21%-Accurate, User-Set Current Limit12µA (typ) Quiescent Current0.01µA (typ) Shutdown Current0.04µA (typ) Leakage to Output when Switch
is Off2.7V to 5.5V Input RangeThermal ShutdownFAULT
Output
MAX869L
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown19-1278; Rev 0; 8/97
MAX869L
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Note 1:Guaranteed by design. Derived from the ISETcurrent ratio; current-limit amplifier and external set resistor accuracies.
Note 2:Tested with IOUT= 200mA and VSETraised until (VIN- VOUT) ‡0.8V.
Note 3:Specifications to -40°C are guaranteed by design, not production tested.
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 .....................................3A
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.3mW/°C above +70°C) .......................667mW
Operating Temperature Range
MAX869LEEE.....................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX869L
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Note 1:Guaranteed by design. Derived from the ISETcurrent ratio; current-limit amplifier and external set resistor accuracies.
Note 2:Tested with IOUT= 200mA and VSETraised until (VIN- VOUT) ‡0.8V.
Note 3: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 3)
MAX869L
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX869L
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
_______________Detailed DescriptionThe MAX869L P-channel MOSFET power switch limits
output current to a programmed level. When the output
current passes through the main switch, a smaller cur-
rent also passes through the replica switch (IOUT / 955)
and through RSET(Figure 1). When the voltage on RSET
exceeds the trip voltage of 1.24V, the current-limit error
amplifier regulates the output current to the pro-
grammed current limit, ILIMIT(400mA to 2.4A).
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
Setting the Current LimitThe MAX869L features internal current-limiting circuitry
with a maximum programmable value (IMAX) of 2.4A.
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/ 955
RSET= 1.24V / ISET =1,184/ILIMIT
where ILIMITis the desired current limit.
MAX869L
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
