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MAX1838EEE maxim 美信芯片 电子元器件中文版规格手册.pdf
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MAX1838EEE maxim 美信芯片 电子元器件中文版规格手册
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General Description
The MAX1838 is a dual, current-limited USB switch with
auxiliary input supply. Each switch meets all IEC speci-
fications for USB ports and is guaranteed to supply
500mA from either of two input supplies. A control pin
selects the power source from either the main or auxil-
iary supply.
The MAX1838 has multiple protection features, includ-
ing independent thermal-shutdown on each channel to
limit junction temperature in case of a prolonged short
or overload condition. The device has accurate internal
current-limit and reverse-current protection to safe-
guard the input supply against overload. When pow-
ered from the auxiliary supply, the current limit on each
channel is set independently with an external resistor.
An autoreset feature latches the switch off if the output
is shorted, thereby saving system power. When the
short is removed, the switch automatically turns back
on. Independent fault signals (FAULTA and FAULTB)
notify the microprocessor (µP) that the internal current
limit has been reached. A 20ms fault-blanking feature
prevents the MAX1838 from issuing false alarms to the
host during power-up or when hot-swapping into a
capacitive load.
The MAX1838 is available in a space-saving 16-pin
QSOP. For other USB current-limited switches, refer to
the MAX1693, MAX1694, MAX1812, and MAX1823.
Applications
Desktops
Notebook Computers
USB Ports
Docking Stations
Features
o Dual USB Switch with Auxiliary Input
o Autoreset from Fault Condition
o Guaranteed 500mA Load per Channel
o Programmable Current Limits on Auxiliary Inputs
o Reverse Current Protection
o Thermal Overload Protection
o Built-In 20ms Fault-Blanking
o 4V to 5.5V Range
o Independent FAULT Indicator Outputs
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset
________________________________________________________________
Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
GND FAULTA
ADJA
OUTA2
OUTA1
OUTB2
OUTB1
ADJB
FAULTB
TOP VIEW
MAX1838
QSOP
SEL
AUXA
AUXB
INA
INB
ON
GND
Pin Configuration
Ordering Information
19-2033; Rev 1; 2/10
PART TEMP RANGE PIN-PACKAGE
MAX1838EEE -40°C to +85°C 16 QSOP
FAULTB
FAULTA
OUTB
OUTA
ADJB
ADJA
AUXA
AUXB
INA
INB
SEL
ON
GND
AUX
IN
OUTB
OUTA
10µF
MAX1838
Typical Operating Circuit
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN__
= V
AUX__
= 5V, ON = SEL = GND, ADJ_ = open, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+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_, AUX_, ON, OUT_, SEL, FAULT_,
ADJ_ to GND .........................................................-0.3V to +6V
IN_, AUX_ to OUTA_; IN_, AUX_ to OUTB_.................-6V to +6V
AUX_ to IN_ .................................................................-6V to +6V
Maximum Continuous Switch Current
(per channel, internally limited).............................................1.2A
FAULT_ Current ..................................................................20mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
IN_
4.0 5.5
Supply Voltage Range
V
AUX_
4.0 5.5
V
V
IN
_ = 5V, each switch 95 170
Switch On-Resistance R
ON
V
IN
_ = 4V, each switch 100
mΩ
AUX_ Standby Supply Current V
ON
= V
AUX
_ 7 16 µA
IN_ Standby Supply Current V
ON
= V
IN
_13µA
AUX_ Quiescent Supply Current V
ON
= 0V, I
OUT
_ = 0A 66 350 µA
IN_ Quiescent Supply Current V
ON
= 0V, I
OUT
_ = 0A, SEL = AUX_ 23 300 µA
OUT_ Off-Leakage Current V
ON
= V
IN
_, V
OUTA
_ = V
OUTB
_ = 0V 0.02 10 µA
Reverse Leakage Current V
OUT
= 5.5V, V
IN
_ = V
AUX
_ = 0V 0.02 10 µA
Undervoltage Lockout Threshold V
UVLO
V
IN
_ or V
AUX
_ rising edge, 3% hysteresis 3.0 3.5 3.8 V
Continuous Load Current 500 mA
V
IN
_ - V
OUT
_ = 0.5V, SEL = AUX_ 0.6 0.9 1.2
V
AUX
_ - V
OUT
_ = 0.5V, SEL = GND 0.6 0.9 1.2
Current-Limit Threshold I
LIM
R
ADJ
_ = 67kΩ 0.09 0.225 0.36
A
0.3 0.48 A
PEAK
SEL = GND,
V
OUT
_ = 0V
(I
OUT
_ pulsing)
R
ADJ
_ = 67kΩ
0.09 A
RMS
0.6 1.2 1.8 A
PEAK
Short-Circuit Current Limit I
SHORT
SEL = AUX_, V
OUT
_ = 0V
0.35 A
RMS
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT_ assertion
10 20 35 ms
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT_ assertion
7.5 18 35 ms
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN__
= V
AUX__
= 5V, ON = SEL = GND, ADJ_ = open, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+25°C.)
PARAMETER SYM BOL CONDITIONS MIN TYP MAX UNITS
Turn-On Delay
R
OUT_
= 10Ω, does not include rise time
(from ON asserted to V
OUT
_ = 10% of
V
IN
_), C
OUT
_ = 1µF
0.5 2 4.0 ms
Output Rise Time
R
OUT
_ = 10Ω, from 10% to 90% of V
OUT_
,
C
OUT
_ = 1µF
4.5 ms
Turn-Off Delay from ON
R
OUT
_ = 10Ω, does not include fall time
(from ON asserted to V
OUT_
= 90% of
V
IN
_), C
OUT
_ = 1µF
0.8 3 ms
Output Fall Time
R
OUT
_ = 10Ω, from 90% to 10% of V
OUT
_,
C
OUT
_ = 1µF
3ms
Thermal Shutdown Threshold 10°C hysteresis 160 °C
Logic Input High Voltage V
IN
_ = 4V to 5.5V 2 V
Logic Input Low Voltage V
IN
_ = 4V to 5.5V 0.8 V
Logic Input Current V
ON
= 0V or 5.5V -1 1 µA
FAULT_ Output Low Voltage V
IN
_ = 4V, sinking 1mA 0.4 V
FAULT_ Output High Leakage
Current
V
IN
_ = V
FAULT_
= 5.5V 1 µA
Autoreset Current In latched-off state, V
OUT
_ = 0V 10 25 50 mA
Autoreset Threshold In latched-off state, V
OUT
_ rising 0.4 0.5 0.6 V
Autoreset Blanking Time In latched-off state, V
OUT
_ > 1V 10 20 35 ms
AUX_ to IN_ or IN_ to AUX_
Select Delay
Make-before-break (Note 1) 4.5 9 18 ms
ELECTRICAL CHARACTERISTICS
(V
IN__
= V
AUX__
= V
ON
= 5V, SEL = GND, ADJ_ = open, T
A
= -40°C to +85°C, unless otherwise noted. Circuit of Figure 1.) (Note 2)
PARAMETER SYM BO L CONDITIONS MIN MAX UNITS
V
IN
_ 4.0 5.5 V
Supply Voltage Range
V
AUX
_ 4.0 5.5 V
Switch On-Resistance R
ON
V
IN
_
= 5V, each switch 170 mΩ
AUX_ Standby Supply Current V
ON
= V
AUX
_16µA
IN_ Standby Supply Current V
ON
= V
IN
_3µA
AUX_ Quiescent Supply Current V
ON
= 0V, I
OUT
_
= 0A 350 µA
IN_ Quiescent Supply Current V
ON
= 0V, I
OUT
= 0A, SEL = AUX_ 300 µA
OUT_ Off-Leakage Current V
ON
= V
IN
_
,
V
OUTA
_ = V
OUTB
_ = 0V 10 µA
Reverse Leakage Current V
OUT
_ = 5.5V, V
IN
_ = V
AUX
_ = 0V 10 µA
Undervoltage Lockout Threshold V
UVLO
V
IN
_ or V
AUX
_ rising edge, 3% hysteresis 3.0 3.8 V
Continuous Load Current 500 mA
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