MAX892L [MAXIM]
2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown; 2A，限流型，高边P沟道开关，带有热关断
| 型号： | MAX892L |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| 文件： | 总8页 (文件大小：92K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1278; Rev 0; 8/97
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
MAX869L
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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.
♦ Very Small Footprint (16-pin QSOP is the same
size as an 8-pin SO)
♦ Low Resistance: 45mΩ at 3V
♦ ±21%-Accurate, User-Set Current Limit
♦ 12µA (typ) Quiescent Current
♦ 0.01µA (typ) Shutdown Current
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.
♦ 0.04µA (typ) Leakage to Output when Switch
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.
is Off
♦ 2.7V to 5.5V Input Range
♦ Thermal Shutdown
♦ FAULT Output
For other devices in this family, consult the Selector
Guide.
______________Ord e rin g In fo rm a t io n
_____________________S e le c t o r Gu id e
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
Dice*
R
AT 3V
(mΩ)
NOMINAL
CURRENT COUNT
(A)
ON
MAX869LC/D
MAX869LEEE
PART
PACKAGE
-40°C to +85°C
16 QSOP
*Dice are specified at T = +25°C.
A
MAX869L
MAX890L
MAX891L
MAX892L
MAX894L
MAX895L
45
2
Single
Single
Single
Single
Dual
16 QSOP
8 SO
90
1
150
300
150
300
0.5
0.25
0.5
0.25
8 µMAX
8 µMAX
8 SO
__________Typ ic a l Op e ra t in g Circ u it
Dual
8 SO
INPUT
2.7V TO 5.5V
OUTPUT
UP TO 2A
________________________Ap p lic a t io n s
Universal Serial Bus (USB)
Notebook Computers
IN
OUT
0.1µF*
1µF*
MAX869L
100k
Personal Communicators
ON/OFF
FAULT
GND
ON
Palmtop Computers
Hand-Held Instruments
SET
R
SET
Portable Medical Instruments
*FOR USB APPLICATIONS, C = 1µF, C = 120µF
IN
OUT
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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.
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
ABSOLUTE MAXIMUM RATINGS
IN to GND ..................................................................-0.3V to 6V
Operating Temperature Range
ON, FAULT to GND ....................................................-0.3V to 6V
MAX869LEEE.....................................................-40°C to +85°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
SET, OUT to GND ...................................... -0.3V to (V + 0.3V)
IN
Maximum Continuous Switch Current .....................................3A
Continuous Power Dissipation (T = +70°C)
A
QSOP (derate 8.3mW/°C above +70°C) .......................667mW
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.
MAX869L
ELECTRICAL CHARACTERISTICS
(V = 3V, T = 0°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.)
IN
A
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
5.5
20
UNITS
V
Operating Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Undervoltage Lockout
2.7
12
0.01
0.04
2.3
38
µA
µA
µA
V
V
= 5V, ON = GND, I
= 0A
IN
OUT
2
ON = IN, V = V
= 5.5V
IN
OUT
30
ON = IN, V = 5.5V, V
= 0V
IN
OUT
Rising edge, 1% hysteresis
2.0
2.6
70
V
IN
= 4.75V
= 3.0V
On-Resistance
mΩ
V
IN
45
90
Nominal Current-Limit Set Range
Current-Limit-Amplifier Threshold
R
= 1% tolerance (Note 1)
0.40
1.178
810
2.4
1.302
1100
0.8
A
V
SET
V
SET
required to turn the switch off (Note 2)
1.240
955
I
to I
Current Ratio
I
= 1A, V > 1.6V
OUT
A/A
V
OUT
SET
OUT
V
IN
= 2.7V to 5.5V
= 2.7V to 3.6V
= 4.5V to 5.5V
= 5.5V
ON Input Low Voltage
ON Input High Voltage
ON Input Leakage
V
IN
2.0
2.4
V
V
IN
V
0.01
0.05
±1
±3
0.4
1
µA
µA
V
ON
I
Bias Current
V
SET
= 1.24V, I
= 0A
= 1.4V
= 1V
SET
OUT
SET
I
= 1mA, V
FAULT Logic Output Low Voltage
FAULT Logic Output High Leakage Current
Slow-Current-Loop Response Time
Fast-Current-Loop Response Time
SINK
V
= 5.5V, V
0.05
10
µA
µs
FAULT
SET
20% current overdrive, V = 5V
CC
4
µs
V
= 5V, I
= 3V, I
= 5V, I
= 500mA
= 500mA
= 500mA
100
200
10
300
30
IN
OUT
OUT
OUT
Turn-On Time
Turn-Off Time
µs
µs
V
IN
V
IN
2
Note 1: Guaranteed by design. Derived from the I
current ratio; current-limit amplifier and external set resistor accuracies.
SET
Note 2: Tested with I
= 200mA and V
raised until (V - V
) ≥ 0.8V.
OUT
OUT
SET
IN
Note 3: Specifications to -40°C are guaranteed by design, not production tested.
2
_______________________________________________________________________________________
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
MAX869L
ELECTRICAL CHARACTERISTICS
(V = 3V, T = -40°C to +85°C, unless otherwise noted.) (Note 3)
IN
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
5.5
25
UNITS
V
Operating Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Undervoltage Lockout
2.9
µA
µA
µA
V
V
= 5V, ON = GND, I
= 0A
IN
OUT
2.5
30
ON = IN, V = V
= 5.5V
IN
OUT
ON = IN, V = 5.5V, V
= 0V
IN
OUT
Rising edge, 1% hysteresis
2.0
2.85
70
V
IN
= 4.75V
= 3.0V
On-Resistance
mΩ
V
IN
90
Nominal Current-Limit Set Range
Current-Limit-Amplifier Threshold
R
= 1% tolerance (Note 1)
0.40
1.14
765
2.4
1.34
1145
0.4
400
30
A
V
SET
V
SET
required to turn the switch off (Note 2)
I
to I
Current Ratio
I
= 1A, V
> 1.6V
= 1mA, V = 1V
SET
A/A
V
OUT
SET
OUT
OUT
I
FAULT Logic Output Low Voltage
Turn-On Time
SINK
V
IN
= 5V, I
= 500mA
= 500mA
µs
µs
OUT
OUT
Turn-Off Time
V
IN
= 5V, I
2
Note 1: Guaranteed by design. Derived from the I
current ratio; current-limit amplifier and external set resistor accuracies.
SET
Note 2: Tested with I
= 200mA and V
raised until (V - V
) ≥ 0.8V.
OUT
OUT
SET
IN
Note 3: Specifications to -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________
3
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(T = +25°C, unless otherwise noted.)
A
OFF-SUPPLY CURRENT
vs. TEMPERATURE
QUIESCENT CURRENT
vs. INPUT VOLTAGE
QUIESCENT CURRENT
vs. TEMPERATURE
14
14
13
12
11
10
9
20
18
V
= V = 5.5V
IN OUT
ON = GND
12
IN = ON
I
= 0A
OUT
16
14
12
MAX869L
10
8
V = 5V
IN
10
8
6
V = 3V
IN
6
4
4
2
2
0
0
8
-40 -20
0
20
40
60
80 100
0
1
2
3
4
5
6
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
OFF-SWITCH CURRENT
vs. TEMPERATURE
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
I
/I RATIO
OUT SET
vs. SWITCH CURRENT
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
1400
700
600
I
= 1/2I
LIMIT
OUT
V
= V = 5.5V
IN ON
1200
1000
800
OUT = GND
500
400
300
200
600
400
200
0
100
0
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
0
0.4 0.8
1.2 1.6 2.0 2.4 2.8
I (A)
SWITCH
TEMPERATURE (°C)
TEMPERATURE (°C)
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
TURN-ON TIME
vs. TEMPERATURE
TURN-OFF TIME
vs. TEMPERATURE
1.2
1.0
0.8
0.6
0.4
0.2
0
260
240
220
200
180
160
140
120
100
80
12
10
8
C
= 100µF
= 0.1µF
= I
C
= 100µF
= 0.1µF
= I
IN
IN
C
C
OUT
OUT
I
LIMIT
I
I
LOAD LIMIT
LOAD LIMIT
V = 5V
IN
V = 3V
IN
V = 3V
IN
6
V = 5V
IN
4
60
2
40
V = 5V
IN
20
0
0
-40 -20
0
20
40
60
80 100
0
1
2
3
4
5
6
-40 -20
0
20
40
60
80 100
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
MAX869L
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(T = +25°C, unless otherwise noted.)
A
SLOW CURRENT-LIMIT RESPONSE
FAST CURRENT-LIMIT RESPONSE
A
B
A
0V
0V
0V
B
0V
C
D
C
0A
0V
0A
D
0V
4µs/div
2µs/div
C
IN
= 100µF, C = 0.1µF
OUT
C
IN
= 100µF, C = 0.1µF
OUT
C: I , 5A/div
OUT
A: V , 5V/div
FAULT
C: I , 5A/div
OUT
A: V , 5V/div
FAULT
D: V , 5V/div
IN
B: V , 5V/div
OUT
D: V , 5V/div
IN
B: V , 5V/div
OUT
LOAD-TRANSIENT RESPONSE
A
0A
0V
B
10ms/div
V
IN
= 5V
A: I = 0mA TO 1A, 0.5A/div
OUT
B: V RIPPLE, 200mV/div, AC COUPLED
OUT
SWITCH TURN-ON TIME
SWITCH TURN-OFF TIME
A
B
A
B
0V
0V
0V
0A
0V
0A
C
D
C
D
0V
0V
2µs/div
20µs/div
C
IN
= 100µF, C = 0.1µF, V = 5V, I = 1A
OUT IN OUT
C
IN
= 100µF, C = 0.1µF, V = 5V, I = 1A
OUT IN OUT
C: I , 0.5A/div
OUT
A: V , 5V/div
ON
A: V , 5V/div
ON
C: I , 0.5A/div
OUT
D: V
, 2V/div
B: V , 2V/div
OUT
B: V , 2V/div
OUT
D: V
, 2V/div
FAULT
FAULT
_______________________________________________________________________________________
5
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(T = +25°C, unless otherwise noted.)
A
USB* CIRCUIT OUTPUT RISE TIME
USB* CIRCUIT OUTPUT FALL TIME
A
A
B
0V
0V
MAX869L
B
C
0V
0A
0V
0A
C
D
D
0V
0V
500µs/div
500µs/div
V = 5V, I = 1A, C = 1µF, C = 120µF
V = 5V, I = 1A, C = 1µF, C = 120µF
IN OUT IN OUT
IN
OUT
IN
OUT
A: V , 5V/div
ON
A: V , 5V/div
ON
C: I , 0.5A/div
OUT
C: I , 0.5A/div
OUT
B: V , 2V/div
OUT
B: V , 2V/div
OUT
D: V
, 2V/div
D: V
, 2V/div
FAULT
FAULT
*REFER TO TYPICAL OPERATING CIRCUIT
_______________De t a ile d De s c rip t io n
_____________________P in De s c rip t io n
The 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-
PIN
NAME
FUNCTION
Input, P-channel MOSFET source.
Bypass IN with a 1µF capacitor to
ground.
rent also passes through the replica switch (I
/ 955)
OUT
1, 4, 5,
12, 13, 16
IN
and through R
(Figure 1). When the voltage on R
SET
SET
exceeds the trip voltage of 1.24V, the current-limit error
a mp lifie r re g ula te s the outp ut c urre nt to the p ro-
Switch output. P-channel MOSFET
drain. Bypass OUT with a 0.1µF
capacitor to GND.
2, 3, 6,
11, 14, 15
grammed current limit, I
(400mA to 2.4A).
LIMIT
OUT
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
Active-Low Switch-On Input. A logic
low turns the switch on.
7
8
ON
S e t t in g t h e Cu rre n t Lim it
The MAX869L features internal current-limiting circuitry
GND
Ground
with a maximum programmable value (I ) of 2.4A.
MAX
Set Current-Limit Input. A resistor
from SET to ground sets the current
For b e s t p e rforma nc e , s e t the c urre nt limit (I
)
LIMIT
between 0.2 I
≤ I
≤ I . This current limit
MAX
MAX
LIMIT
9
SET
limit for the switch. R
= 1,184 /
SET
remains in effect throughout the input supply-voltage
range.
I
, where I
is the desired cur-
LIMIT
LIMIT
rent limit in amperes.
Program the current limit with a resistor (R
SET to ground (Figure 2) as follows:
) from
SET
Fault-Indicator Output. This open-
drain output goes low when in cur-
rent limit or when the die temperature
exceeds +135°C. FAULT remains low
for Turn-On Time + 50µs during start-
up.
I
= I
/ 955
SET
LIMIT
10
R
= 1.24V / I = 1,184 / I
SET LIMIT
FAULT
SET
where I
is the desired current limit.
LIMIT
6
_______________________________________________________________________________________
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
MAX869L
P
OUT
IN
MAX869L
MAX869L
FAULT
P
SET
N
REPLICA
AMPLIFIER
R
SET
ON
GND
P
SET
ON
CURRENT-LIMIT
AMPLIFIER
R
SET
1.24V
Figure 2. Setting the Current Limit
HOT
Fa u lt In d ic a t o r
GND
The MAX869L provides a fault output (FAULT). This
open-drain output goes low when in current limit or
when the die temperature exceeds 135°C. A 100kΩ
pull-up resistor from FAULT to IN provides a logic-
control signal.
CONTROL
CIRCUITRY
ON
Figure 1. Functional Diagram
__________Ap p lic a t io n s In fo rm a t io n
In p u t Ca p a c it o r
To limit the input voltage drop during momentary output
short-circuit conditions, connect a capacitor from IN to
GND. A 1µF ceramic capacitor is adequate for most
applications; however, higher capacitor values further
reduce the voltage drop at the input.
S h o rt -Circ u it P ro t e c t io n
The MAX869L is a short-circuit-protected switch. In the
event of an output short circuit (V ≤ 1.6V typical),
OUT
the current through the switch is limited by the internal
current-limiting error amplifier to 1.4 x I . When the
LIMIT
s hort-c irc uit c ond ition is re move d , the c urre nt-limit
amplifier sets the current limit back to I
.
LIMIT
Ou t p u t Ca p a c it o r
Connect a 0.1µF capacitor from OUT to GND to prevent
inductive parasitics from pulling OUT below GND dur-
For a high ∆V /∆t during an output short-circuit condi-
DS
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
ing turn-off. USB applications require C
to be at
OUT
least 120µF. This larger output capacitance slows the
outp ut ris e a nd fa ll time s , a s s hown in the Typ ic a l
Op e ra ting Cha ra c te ris tic s, b ut d oe s not a d ve rs e ly
affect the MAX869L’s turn-off response time.
1.4 x I
. Whe n the s hort-c irc uit c ond ition is
LIMIT
removed, the current limit is set back to I . Refer to the
LIMIT
Fast Current-Limit Response and Slow Current-Limit
Response graphs in the Typical Operating Characteristics.
La yo u t a n d Th e rm a l-Dis s ip a t io n
Co n s id e ra t io n s
Th e rm a l S h u t d o w n
The MAX869L features thermal shutdown. The switch
turns off when the junction temperature exceeds 135°C.
Once the device cools by 10°C, the switch turns back
on. If the fault condition is not removed, the switch
cycles on and off, resulting in a pulsed output.
To take full advantage of the switch-response time to
output short-circuit conditions, it is very important to
keep all traces as short as possible to reduce the effect
of undesirable parasitic inductance. Place input and
output capacitors as close as possible to the device
(less than 5mm).
_______________________________________________________________________________________
7
2 A, Cu rre n t -Lim it e d , Hig h -S id e
P -Ch a n n e l S w it c h w it h Th e rm a l S h u t d o w n
Under normal operating conditions, the package can
dissipate and channel heat away. Calculate the maxi-
mum power as follows:
When the output is short circuited, the voltage drop
across the switch equals the input supply. Hence, the
power dissipated across the switch increases, as does
the d ie te mp e ra ture . If the fa ult c ond ition is not
removed, the thermal-overload-protection circuitry turns
the switch off until the die temperature falls by 10°C. A
ground plane in contact with the device helps dissipate
additional heat.
P = I2
x R
ON
LIMIT
where R
is the on-resistance of the switch.
ON
MAX869L
__________________P in Co n fig u ra t io n
___________________Ch ip In fo rm a t io n
TRANSISTOR COUNT: 433
TOP VIEW
SUBSTRATE CONNECTED TO GND
IN
OUT
OUT
IN
1
2
3
4
5
6
7
8
16 IN
15 OUT
14 OUT
13 IN
MAX869L
IN
12 IN
OUT
ON
11 OUT
10 FAULT
GND
9 SET
QSOP
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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SI9122E
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