1690.PDF
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Pobierz
19-1223; Rev 0; 4/97
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
_______________General Description
The MAX891L/MAX892L smart, low-voltage, P-channel,
MOSFET power switches are intended for high-side
load-switching applications. These switches operate
with inputs from 2.7V to 5.5V, making them ideal for
both 3V and 5V systems. Internal current-limiting circuitry
protects the input supply against overload. Thermal-
overload protection limits power dissipation and junc-
tion temperatures.
The MAX891L/MAX892L’s maximum current limits are
500mA and 250mA, respectively. The current limit
through the switch is programmed with a resistor from
SET to ground. When the switch is on, the quiescent
supply current is a low 13µA. When the switch is off, the
quiescent current decreases to 0.1µA.
The MAX891L/MAX892L are available in 8-pin µMAX
packages.
____________________________Features
©
Ultra-Small µMAX Package—Only 1.11mm High
©
2.7V to 5.5V Input Range
©
Programmable Current Limit
©
Low 13µA Quiescent Current at V
IN
= 3.3V,
0.1µA Switch Off
©
Thermal Shutdown
©
FAULT
Indicator Output
©
On-Resistances:
0.12
½
(MAX891L)
0.25
½
(MAX892L)
______________Ordering Information
________________________Applications
PCMCIA Slots
Access Bus Slots
Portable Equipment
TEMP.
RANGE
PIN-
PACKAGE
Dice**
CURRENT
LIMIT
500mA
PART
MAX891L
C/D
0°C to +70°C
MAX891LEUA*
-40°C to +85°C
8 µMAX
500mA
MAX892L
C/D
0°C to +70°C
Dice**
250mA
MAX892LEUA*
-40°C to +85°C
8 µMAX
250mA
* To order these units in tape and reel, add (-T) to the end of the
part number.
**Dice are tested at T
A
= +25°C.
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
INPUT
IN
OUT
OUTPUT
0.1
m
F
IN
OUT
1
8
IN
OUT
MAX891L
MAX89
2
L
100k
IN
OUT
2
7
MAX891L
MAX892L
FAULT
ON
ON/OFF
ON
FAULT
3
6
1
m
F
GND
SET
GND
4
SET
5
m
MAX
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
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
MAX891L ..........................................................................0.75A
MAX892L ........................................................................0.375A
Continuous Power Dissipation (T
A
= +70°C)
µMAX (derate 4.1mW/°C above +70°C) .......................330mW
Operating Temperature Range
MAX891LEUA/MAX892LEUA ............................-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
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Voltage
Quiescent Current
2.7
5.5
V
V
IN
= 5V, ON = GND, I
OUT
= 0mA
13
20
µA
Off-Supply Current
ON = IN, V
IN
= V
OUT
= 5.5V
0.02
1
µA
Off-Switch Current
0.02
3
µA
ON = IN, V
IN
= 5.5V, V
OUT
= 0V
Undervoltage Lockout
Rising edge, 1% hysteresis
2.0
2.3
2.6
V
MAX891L
120
225
V
IN
= 4.5V
m
½
MAX892L
250
420
On-Resistance
MAX891L
150
300
V
IN
= 3.0V
m
½
MAX892L
300
500
Current-Limit-Amplifier Accuracy
V
SET
required to turn the switch off (Note 1)
1.178
1.240
1.302
V
MAX891L
500
Maximum Output Current
mA
MAX892L
250
MAX891L, I
OUT
= 250mA
840
965
1130
I
OUT
to I
SET
Current Ratio
V
OUT
= 1.6V to 2.8V
A/A
MAX892L, I
OUT
= 125mA
840
965
1130
V
IN
= 2.7V to 5.5V
0.8
V
ON Input Low Voltage
V
IN
= 2.7V to 3.6V
2.0
ON Input High Voltage
V
V
IN
= 4.5V to 5.5V
2.4
ON Input Leakage
V
ON
= 5.5V
-1
0.01
1
µA
I
SET
Bias Current
V
SET
= 1.24V, I
OUT
= 0mA
0.5
3
µA
FAULT Logic Output Low Voltage
I
SINK
= 1mA, V
SET
= 1.4V
0.4
V
FAULT Logic Output High Leakage
V
FAULT
= 5.5V, V
SET
= 1V
0.05
1
µA
Slow-Current-Loop Response Time
20% current overdrive, V
IN
= 5V
5
µs
Fast-Current-Loop Response Time
2
µs
V
IN
= 5V
100
200
I
OUT
= 250mA (MAX891L), or 125mA
(MAX892L)
Turn-On Time
µs
V
IN
= 3V
150
Turn-Off Time
V
IN
= 5V
0.8
2
20
µs
2
_______________________________________________________________________________________
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Voltage
Quiescent Current
3.0
5.5
V
V
IN
= 5V, ON = GND, I
OUT
= 0mA
50
µA
Off-Supply Current
ON = IN, V
IN
= V
OUT
= 5.5V
2.2
µA
Off-Switch Current
8
µA
ON = IN, V
IN
= 5.5V, V
OUT
= 0V
Undervoltage Lockout
Rising edge, 1% hysteresis
2.0
2.9
V
MAX891L
225
420
300
V
IN
= 4.5V
m
½
MAX892L
On-Resistance
MAX891L
On-Resistance
V
IN
= 3.0V
m
½
MAX892L
500
Current-Limit-Amplifier Accuracy
V
SET
required to turn the switch off (Note 1)
MAX891L, I
OUT
= 250mA
1.14
1.34
V
805
1210
I
OUT
to I
SET
Current Ratio
V
OUT
= 1.6V to 2.8V
A/A
MAX892L, I
OUT
= 125mA
805
1210
FAULT Logic Output Low Voltage
I
SINK
= 1mA, V
SET
= 1.4V
0.4
V
Turn-On Time
V
IN
= 5V
200
µs
Turn-Off Time
V
IN
= 5V
0.25
20
µs
Note 1:
Tested with I
OUT
= 50mA for the MAX891L, 25mA for the MAX892L, and V
SET
raised until V
IN
- V
OUT
³
0.8V.
Note 2:
Parameters to -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________
3
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
__________________________________________Typical Operating Characteristics
(Typical Operating Circuit, T
A
= +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. INPUT VOLTAGE
QUIESCENT CURRENT
vs. TEMPERATURE
OFF-SUPPLY CURRENT
vs. TEMPERATURE
14
14
0.06
12
13
0.05
V
IN
= 5V
10
12
0.04
8
11
0.03
V
IN
= 3V
6
10
0.02
4
9
0.01
2
8
0
7
0
0
1
2
3
4
5
6
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
OFF-SWITCH LEAKAGE CURRENT
vs. TEMPERATURE
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
I
OUT
/I
SET
RATIO
vs. I
LIMIT
1.3
1400
0.06
I
LOAD
= 1/2I
LIM
1.2
1200
0.05
1.1
1000
0.04
1.0
800
0.03
0.9
600
0.02
0.8
400
0.01
0.7
200
0
0.6
0
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
0
20
40
60
80
100
120
140
TEMPERATURE (°C)
TEMPERATURE (°C)
I
LIMIT
(%)
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
TURN-ON TIME
vs. TEMPERATURE
TURN-OFF TIME
vs. TEMPERATURE
1.2
260
4
I
LOAD
= I
LIM
I
LOAD
= I
LIM
240
I
LIMIT
1.0
V
IN
= 5V
220
3
200
0.8
V
IN
= 3V
V
IN
= 3V
180
0.6
160
2
140
0.4
120
V
IN
= 5V
1
100
0.2
V
IN
= 5V
80
0
60
0
0
1
2
3
4
5
6
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Current-Limited, High-Side
P-Channel Switches with Thermal Shutdown
____________________________Typical Operating Characteristics (continued)
(Typical Operating Circuit, T
A
= +25°C, unless otherwise noted.)
CURRENT-LIMIT RESPONSE
(MAX891L, R
L
= 0.8
W
)
CURRENT-LIMIT RESPONSE
(MAX891L, R
L
= 0.5
W
)
A
5V
5V
A
B
B
0A
0A
C
C
0V
0V
2µs/div
1µs/div
B: I
OUT
, 2A/div
C: V
OUT
, 5V/div
C
IN
= 47µF, C
OUT
= 0.1µF
A: V
IN
, 500mV/div, AC COUPLED
C
IN
= 47µF, C
OUT
= 0.1µF
A: V
IN
, 500mV/div, AC COUPLED
B: I
OUT
, 2A/div
C: V
OUT
, 5V/div
SWITCH TURN-ON TIME
A
B
20µs/div
V
IN
= 5
V, I
OUT
= I
LIM
A: V
ON
, 2V/div
B: V
OUT
, 2V/div
SWITCH TURN-OFF TIME
SWITCH TIMING CHARACTERISTICS
A
0A
A
B
0V
0V
C
0V
B
D
0V
0V
2µs/div
50µs/div
V
IN
= 5V
A: I
LOAD
, 0.1A/div
B: V
ON
, 5V/div
V
IN
= 5
V, I
OUT
= I
LIM
A: V
ON
, 2V/div
B: V
OUT
, 2V/div
C: V
OUT
, 5V/div
D: V
FAULT
, 5V/div
_______________________________________________________________________________________
5
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