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MAX890LESA+-MAX890LESA+T-MAX890LESA-T
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 Range♦
Programmable Current Limit♦
Low Quiescent Current
10µA (typ) at VIN= +3.3V
0.1µA (typ) with Switch Off♦
Thermal Shutdown♦FAULT
Indicator Output♦
0.09Ω(typ) On-Resistance
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown FAULT
OUT
OUT
SET
GND
MAX890L
TOP VIEW
Pin ConfigurationMAX890L
1μF
0.1μF
100kΩOUTPUTOUTINPUTOUT
FAULTONON/OFF
RSET
GNDSET
Typical Operating Circuit19-1146; Rev 4; 4/11
Ordering Information*To order this unit in tape and reel, add (T) to the end of the
part number.
**Dice are tested at TA= +25°C.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
PART TEMP RANGE PIN-
PACKAGE
CURRENT
LIMIT MAX890LC/D0°C to +70°C Dice**1.2A
MAX890LESA+-40°C to +85°C 8 SO1.2A
MAX890LESA/V+-40°C to +85°C 8 SO1.2A
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 +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, 10s) ................................+300°C
Soldering Temperature (reflow).......................................+260°C= IN, VIN= VOUT= 5.5V
VIN= 5V
VIN= 3V, IOUT= 500mA
VIN= 5V, ON= GND, IOUT= 0A
VIN= 5V, IOUT= 500mA
20% current overdrive, VCC= 5V
VFAULT= 5.5V, VSET= 1V
VIN= 2.7V to 3.6V
VIN= 2.7V to 5.5V
ISINK= 1mA, VSET= 1.4V
VSET= 1.24V, IOUT= 0A; VIN= VOUT
IOUT= 500mA, VOUT> 1.6V= IN, VIN= 5.5V, VOUT= 0V
Rising edge, 1% hysteresis
VIN= 4.5V
VON= 5.5V
VSETrequired to turn the switch off (Note 1)
VIN= 4.5V to 5.5V
CONDITIONS25Turn-Off Time185Turn-On Time1202002Fast-Current-Loop Response Time5Slow-Current-Loop Response Time0.051FAULTLogic Output High Leakage Current0.4FAULTLogic Output Low Voltage0.53ISETBias Current0.011ONInput Leakage Current2.4ONInput High Voltage0.031Off-Supply Current13202.75.5Operating Voltage
Quiescent Current
2.00.8ONInput Low Voltage
A/A97011101300IOUTto ISETCurrent Ratio1.2Maximum Output Current Limit0.0415Off-Switch Current2.02.42.6Undervoltage Lockout1301.1781.2401.302Current-Limit-Amplifier Threshold
UNITSMINTYPMAXPARAMETERVIN= 3.0VmΩ90150On-Resistance
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.= IN, VIN= VOUT= 5.5V
VIN= 5V
VIN= 5V, ON= GND, IOUT= 0A
ISINK= 1mA, VSET= 1.4V
IOUT= 500mA, VOUT> 1.6V= IN, VIN= 5.5V, VOUT= 0V
Rising edge, 1% hysteresis
VIN= 4.5V
VSETrequired to turn the switch off (Note 1)
CONDITIONSVIN= 3.0VmΩ150200
On-Resistance
Turn-On Time0.4FAULTLogic Output Low Voltage2.2Off-Supply Current503.05.5Operating Voltage
Quiescent Current
A/A9251390IOUTto ISETCurrent Ratio15Off-Switch Current2.02.9Undervoltage Lockout
1301.141.34Current-Limit-Amplifier Threshold
UNITSMINTYPMAXPARAMETER
ELECTRICAL CHARACTERISTICS(VIN= +3V, TA
= -40°C to +85°C,unless otherwise noted.) (Note 2)
VIN= 5Vµs120Turn-Off Time
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 = 1/2ILIMIT
IOUT/ISET RATIO
vs. ILIMIT
MAX890 toc06
ILIMIT (%)
IOUT
SET
RATIO100120
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX890 toc07
NORMALIZED OUTPUT CURRENT23456
ILIMIT
VIN = 5V
TURN-ON TIME
vs. TEMPERATURE
MAX890 toc08
tON180
ILOAD = ILIMIT
VIN = 3V
VIN = 5V
TURN-OFF TIME
vs. TEMPERATURE
MAX890 toc09
tOFF
ILOAD = ILIMIT
VIN = 3V
VIN = 5V
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. INPUT VOLTAGEMAX890 toc01
INPUT VOLTAGE (V)23456
ON = GND
IOUT = 0A
QUIESCENT CURRENT (
QUIESCENT CURRENT
vs. TEMPERATURE
MAX890 toc02
TEMPERATURE (°C)
QUIESCENT CURRENT (
VIN = 3V
VIN = 5V
OFF-SUPPLY CURRENT
vs. TEMPERATURE
MAX890 toc03
TEMPERATURE (°C)
OFF-SUPPLY CURRENT (nA)
VIN = 5V
A: IOUT = 0mA TO 750mA,
0.5A/div
LOAD-TRANSIENT RESPONSE5ms/div
B: VOUT RIPPLE,
200mV/div, AC COUPLED
MAX890 toc12
VIN = 5V, IOUT = ILIMIT
A: VON, 2V/div
B: VOUT, 2V/div
SWITCH TURN-ON TIME20μs/div
MAX890 toc13
CIN = 100μF, COUT = 0.1μF
A: VIN, 1V/div, AC-COUPLED
OUTPUT SHORT-CIRCUIT
(FAST LOOP RESPONSE)A5V
2μs/div
B: IOUT, 5A/div
C: VOUT, 2V/div
MAX890 toc11
CIN = 100μF, COUT = 0.1μF
A: VIN, 1V/div, AC-COUPLED
OUTPUT OVERLOAD
(SLOW LOOP RESPONSE)A5V
0V, 0A
2μs/div
B: IOUT, 1A/div
C: VOUT, 2V/div
MAX890 toc10
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
SWITCH TURN-OFF TIME2μs/div
VIN = 5V, IOUT = ILIMIT
A: VON, 2V/div
MAX890 toc14
MAX890L
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
Pin DescriptionSwitch Output. P-channel MOSFET drain. Bypass OUT with a 0.1μF capacitor to ground.OUT6, 7
Fault-Indicator Output. This open-drain output goes low when in current limit or when the die temperature
exceeds +135°C. FAULT8
Set Current-Limit Input. A resistor from SET to ground sets the current limit for the switch.
RSET= 1.38 x 103/ILIMIT,where ILIMITis the desired current limit in amperes.SET5
GroundGND4
PINActive-Low Switch On Input. A logic low turns the switch on.ON3
Input. P-channel MOSFET source. Bypass IN with a 1μF capacitor to ground.IN1, 2
FUNCTIONNAME
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 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 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 the Output
Short-Circuit Fast-Loop Response and Output Overload
Slow-Loop Response in the Typical Operating
Characteristics.
MAX890L
RSET
SET
OUT
GND
1.24V
FAULTCURRENT-LIMIT
AMPLIFIER
REPLICA
AMPLIFIER
HOT
CONTROL
CIRCUITRY
Figure 1. Functional Diagram
