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19-1278; Rev 0; 8/97
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
_______________General Description
The 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, 45mΩ switch 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.
____________________________Features
o
Very Small Footprint (16-pin QSOP is the same
size as an 8-pin SO)
o
Low Resistance: 45mΩ at 3V
o
±21%-Accurate, User-Set Current Limit
o
12µA (typ) Quiescent Current
o
0.01µA (typ) Shutdown Current
o
0.04µA (typ) Leakage to Output when Switch
is Off
o
2.7V to 5.5V Input Range
o
Thermal Shutdown
o
FAULT
Output
MAX869L
_____________________Selector Guide
PART
MAX869L
MAX890L
MAX891L
MAX892L
MAX894L
MAX895L
R
ON
AT 3V
(mΩ)
45
90
150
300
150
300
NOMINAL
CURRENT
(A)
2
1
0.5
0.25
0.5
0.25
COUNT
Single
Single
Single
Single
Dual
Dual
PACKAGE
16 QSOP
8 SO
8 µMAX
8 µMAX
8 SO
8 SO
______________Ordering Information
PART
MAX869LC/D
MAX869LEEE
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
16 QSOP
*Dice
are specified at T
A
= +25°C.
__________Typical Operating Circuit
________________________Applications
Universal Serial Bus (USB)
Notebook Computers
Personal Communicators
Palmtop Computers
Hand-Held Instruments
Portable Medical Instruments
INPUT
2.7V TO 5.5V
1µF
*
100k
IN
OUT
OUTPUT
UP TO 2A
0.1µF
*
MAX869L
FAULT
GND
ON
SET
ON/OFF
R
SET
Pin Configuration appears at end of data sheet.
*
FOR USB APPLICATIONS, C
IN
= 1µF, C
OUT
= 120µF
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
MAX869L
ABSOLUTE MAXIMUM RATINGS
IN to GND ..................................................................-0.3V to 6V
ON, FAULT
to GND ....................................................-0.3V to 6V
SET, OUT to GND ...................................... -0.3V to (V
IN
+ 0.3V)
Maximum Continuous Switch Current .....................................3A
Continuous Power Dissipation (T
A
= +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
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.
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Operating Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Undervoltage Lockout
On-Resistance
Nominal Current-Limit Set Range
Current-Limit-Amplifier Threshold
I
OUT
to I
SET
Current Ratio
ON
Input Low Voltage
ON
Input High Voltage
ON
Input Leakage
I
SET
Bias Current
FAULT
Logic Output Low Voltage
FAULT
Logic Output High Leakage Current
Slow-Current-Loop Response Time
Fast-Current-Loop Response Time
Turn-On Time
Turn-Off Time
V
IN
= 5V, I
OUT
= 500mA
V
IN
= 3V, I
OUT
= 500mA
V
IN
= 5V, I
OUT
= 500mA
2
V
IN
= 5V,
ON
= GND, I
OUT
= 0A
ON
= IN, V
IN
= V
OUT
= 5.5V
ON
= IN, V
IN
= 5.5V, V
OUT
= 0V
Rising edge, 1% hysteresis
V
IN
= 4.75V
V
IN
= 3.0V
R
SET
= 1% tolerance (Note 1)
V
SET
required to turn the switch off (Note 2)
I
OUT
= 1A, V
OUT
> 1.6V
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 3.6V
V
IN
= 4.5V to 5.5V
V
ON
= 5.5V
V
SET
= 1.24V, I
OUT
= 0A
I
SINK
= 1mA, V
SET
= 1.4V
V
FAULT
= 5.5V, V
SET
= 1V
20% current overdrive, V
CC
= 5V
0.05
10
4
100
200
10
30
300
2.0
2.4
0.01
0.05
±1
±3
0.4
1
0.40
1.178
810
1.240
955
2.0
CONDITIONS
MIN
2.7
12
0.01
0.04
2.3
38
45
TYP
MAX
5.5
20
2
30
2.6
70
90
2.4
1.302
1100
0.8
UNITS
V
µA
µA
µA
V
mΩ
A
V
A/A
V
V
µA
µA
V
µA
µs
µs
µs
µs
Note 1:
Guaranteed by design. Derived from the I
SET
current ratio; current-limit amplifier and external set resistor accuracies.
Note 2:
Tested with I
OUT
= 200mA and V
SET
raised until (V
IN
- V
OUT
)
≥
0.8V.
Note 3:
Specifications to -40°C are guaranteed by design, not production tested.
2
_______________________________________________________________________________________
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER
Operating Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Undervoltage Lockout
On-Resistance
Nominal Current-Limit Set Range
Current-Limit-Amplifier Threshold
I
OUT
to I
SET
Current Ratio
FAULT
Logic Output Low Voltage
Turn-On Time
Turn-Off Time
V
IN
= 5V,
ON
= GND, I
OUT
= 0A
ON
= IN, V
IN
= V
OUT
= 5.5V
ON
= IN, V
IN
= 5.5V, V
OUT
= 0V
Rising edge, 1% hysteresis
V
IN
= 4.75V
V
IN
= 3.0V
R
SET
= 1% tolerance (Note 1)
V
SET
required to turn the switch off (Note 2)
I
OUT
= 1A, V
OUT
> 1.6V
I
SINK
= 1mA, V
SET
= 1V
V
IN
= 5V, I
OUT
= 500mA
V
IN
= 5V, I
OUT
= 500mA
2
0.40
1.14
765
2.0
CONDITIONS
MIN
2.9
TYP
MAX
5.5
25
2.5
30
2.85
70
90
2.4
1.34
1145
0.4
400
30
UNITS
V
µA
µA
µA
V
mΩ
A
V
A/A
V
µs
µs
MAX869L
3
Note 1:
Guaranteed by design. Derived from the I
SET
current ratio; current-limit amplifier and external set resistor accuracies.
Note 2:
Tested with I
OUT
= 200mA and V
SET
raised until (V
IN
- V
OUT
)
≥
0.8V.
Note 3:
Specifications to -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
MAX869L
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. INPUT VOLTAGE
MAX869-01
QUIESCENT CURRENT
vs. TEMPERATURE
MAX869-02
OFF-SUPPLY CURRENT
vs. TEMPERATURE
18
OFF-SUPPLY CURRENT (nA)
16
14
12
10
8
6
4
2
V
IN
= V
OUT
= 5.5V
IN = ON
MAX869-03
14
12
QUIESCENT CURRENT (µA)
10
8
6
4
2
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
ON = GND
I
OUT
= 0A
14
13
12
V
IN
= 5V
11
10
9
8
-40
-20
0
20
40
60
80
V
IN
= 3V
20
QUIESCENT CURRENT (µA)
0
100
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
OFF-SWITCH CURRENT
vs. TEMPERATURE
MAX869-04
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX890-05
I
OUT
/I
SET
RATIO
vs. SWITCH CURRENT
MAX890-06
700
600
OFF-SWITCH CURRENT (nA)
500
400
300
200
100
0
-40
-20
0
20
40
60
80
V
IN
= V
ON
= 5.5V
OUT = GND
1.4
1.3
1.2
NORMALIZED R
ON
1.1
1.0
0.9
0.8
0.7
0.6
I
OUT
= 1/2I
LIMIT
1400
1200
I
OUT
/I
SET
RATIO
1000
800
600
400
200
0
100
-40
-20
0
20
40
60
80
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
TEMPERATURE (°C)
TEMPERATURE (°C)
I
SWITCH
(A)
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX869-06A
TURN-ON TIME
vs. TEMPERATURE
260
240
220
200
180
160
140
120
100
80
60
40
20
0
MAX869-07
TURN-OFF TIME
vs. TEMPERATURE
C
IN
= 100µF
C
OUT
= 0.1µF
I
LOAD
= I
LIMIT
MAX869-08
1.2
NORMALIZED OUTPUT CURRENT
1.0
0.8
I
LIMIT
C
IN
= 100µF
C
OUT
= 0.1µF
I
LOAD
= I
LIMIT
V
IN
= 3V
12
10
8
t
OFF
(µs)
V
IN
= 3V
6
4
2
0
V
IN
= 5V
0.6
0.4
0.2
V
IN
= 5V
0
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V)
t
ON
(µs)
V
IN
= 5V
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
FAST CURRENT-LIMIT RESPONSE
MA869-09
MAX869L
SLOW CURRENT-LIMIT RESPONSE
A
0V
B 0V
MA869-10
A
0V
B 0V
C
0A
D
0V
2µs/div
C
IN
= 100µF, C
OUT
= 0.1µF
C: I
OUT
, 5A/div
A: V
FAULT
, 5V/div
D: V
IN
, 5V/div
B: V
OUT
, 5V/div
C
0A
D
0V
4µs/div
C
IN
= 100µF, C
OUT
= 0.1µF
C: I
OUT
, 5A/div
A: V
FAULT
, 5V/div
D: V
IN
, 5V/div
B: V
OUT
, 5V/div
LOAD-TRANSIENT RESPONSE
MA869-11
A
0A
0V
B
10ms/div
V
IN
= 5V
A: I
OUT
= 0mA TO 1A, 0.5A/div
B: V
OUT
RIPPLE, 200mV/div, AC COUPLED
SWITCH TURN-ON TIME
MA869-12
SWITCH TURN-OFF TIME
A
0V
B
MA869-13
A
0V
B
0V
C
0A
D
0V
20µs/div
C
IN
= 100µF, C
OUT
= 0.1µF, V
IN
= 5V, I
OUT
= 1A
C: I
OUT
, 0.5A/div
A: V
ON
, 5V/div
D: V
FAULT
, 2V/div
B: V
OUT
, 2V/div
C
0V
0A
D
0V
2µs/div
C
IN
= 100µF, C
OUT
= 0.1µF, V
IN
= 5V, I
OUT
= 1A
A: V
ON
, 5V/div
C: I
OUT
, 0.5A/div
B: V
OUT
, 2V/div
D: V
FAULT
, 2V/div
_______________________________________________________________________________________
5

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