MAX1823AEUB [ROCHESTER]
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10, MICRO, SOP-10;
| 型号： | MAX1823AEUB |
| 厂家： | 
Rochester Electronics |
| 描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10, MICRO, SOP-10 信息通信管理 光电二极管 |
| 文件： | 总16页 (文件大小：1057K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1903; Rev 3; 10/03
Dual USB Switch with Fault
Blanking and Autoreset
General Description
Features
ꢀ Dual USB Switch in Tiny 10-Pin µMAX Package
ꢀ Autoreset Feature Saves Power
The MAX1823 is a dual, current-limited switch with
autoreset specifically made for USB applications. The
autoreset feature latches the switch off if the output is
shorted, saving system power. The switch reactivates
when the short circuit is removed. Each channel is guar-
anteed to supply 720mA and meet USB specifications.
Low quiescent supply current (50µA) and standby current
(3µA) conserve battery power in portable applications.
ꢀ Guaranteed 720mA Load per Channel
ꢀ Built-In 20ms Fault Blanking
ꢀ Compliant to USB Specification
ꢀ Blocks Reverse Current in Shutdown
(MAX1823A/MAX1823B)
The MAX1823 has multiple safety features to ensure
that the USB port is protected. Built-in thermal-overload
protection limits power dissipation and junction temper-
ature. Accurate internal current-limiting circuitry pro-
tects the input supply against both overload and
short-circuit conditions. Independent fault signals
(FAULTA and FAULTB) notify the microprocessor (µP)
when a thermal-overload, current-limit, undervoltage-
lockout (UVLO), or short-circuit fault occurs. A 20ms
fault-blanking feature ignores momentary faults, such
as those caused when hot swapping a capacitive load,
preventing false alarms to the host system. The
MAX1823A/MAX1823B also block reverse current (cur-
rent from OUT_ to IN_) while in shutdown.
ꢀ 4V to 5.5V Input Voltage Range
ꢀ Independent Shutdown Control
(MAX1823/MAX1823A—Active Low)
(MAX1823B/MAX1823H—Active High)
ꢀ Independent FAULT Indicator Outputs
ꢀ Thermal-Overload Protection
ꢀ 50µA Quiescent Current (Both Switches On)
ꢀ 3µA Standby Current
ꢀ UL Recognized
The MAX1823 is available in a space-saving 10-pin
µMAX package. The MAX1823/MAX1823A are enabled
with an active-low signal, and the MAX1823B/MAX1823H
are enabled with an active-high signal. For a single ver-
sion of this device, refer to the MAX1946 data sheet. For
a triple version, refer to the MAX1940 data sheet.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
MAX1823EUB
MAX1823AEUB
MAX1823BEUB
MAX1823HEUB
10 µMAX
10 µMAX
10 µMAX
Applications
USB Ports and Hubs
Notebook and Desktop Computers
PDAs and Palmtop Computers
Docking Stations
Typical Operating Circuit
USB
INA
IN
OUTA
PORT A
INPUT
4V TO 5.5V
INB
Pin Configuration
MAX1823
MAX1823A
TOP VIEW
*(ONA) ONA
1
2
3
4
5
10 FAULTA
USB
PORT B
FAULTA
FAULTB
OUTB
INA
IN
9
8
7
6
OUTA
GND
MAX1823
MAX1823A
MAX1823B
MAX1823H
INB
OUTB
FAULTB
ONA
ONB
ONA
ONB
*(ONB) ONB
GND
µMAX
*( ) ARE FOR MAX1823B/MAX1823H.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual USB Switch with Fault
Blanking and Autoreset
ABSOLUTE MAXIMUM RATINGS
IN, INA, INB, ONA, ONB, ONA, ONB
FAULTA, FAULTB Current .................................................20mA
OUTA, OUTB to GND...........................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
A
FAULTA, FAULTB to GND..........................-0.3V to (V
+ 0.3V)
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
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
IN_
MAX1823/MAX1823H, INA, IN to OUTA;
INB, IN to OUTB ...................................................-0.3V to +6V
MAX1823A/MAX1823B, INA, IN to OUTA;
INB, IN to OUTB (when disabled, Note 3)...............-6V to +6V
INA, IN to OUTA; INB, IN to OUTB
(when enabled, Note 4)..............................-1.5A to +1.5A
RMS
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
(Circuit of Figure 1, V = V
= V
= 5V, ONA = ONB = GND (MAX1823/MAX1823A), ONA = ONB = IN (MAX1823B/MAX1823H),
IN
INA
INB
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
4.0
5.5
V
T
= +25°C, each switch,
A
75
90
105
120
135
165
10
MAX1823/MAX1823H
T
= +25°C, each switch,
A
MAX1823A/MAX1823B
Switch On-Resistance
R
ON
mΩ
T
= 0°C to +85°C, each switch,
A
MAX1823/MAX1823H
T
= 0°C to +85°C, each switch,
A
MAX1823A/MAX1823B
ON_ = IN_ (MAX1823/MAX1823A), ON_ =
GND (MAX1823B/MAX1823H)
Standby Supply Current
Quiescent Supply Current
3
µA
µA
I
I
= I
= I
= 0A, one channel on
= 0A, both channels on
40
50
80
OUTA
OUTB
100
1.00
OUTA
OUTB
ON_ = IN_ (MAX1823/MAX1823A), ON_ = GND
(MAX1823B/MAX1823H), V = V = 0V,
T
0.02
OUTA
OUTB
= +25oC
A
OUT_ Off-Leakage Current
µA
ON_ = IN_ (MAX1823/MAX1823A), ON_ =
GND (MAX1823B/MAX1823H),
0.02
3.4
10.00
3.8
V
= V
= 0V, T = 0oC to +85oC
OUTB A
OUTA
Undervoltage-Lockout Threshold
Continuous Load Current
Continuous Current Limit
V
Rising edge, 3% hysteresis
3.0
720
0.72
0.8
V
mA
A
UVLO
I
V
V
V
- V = 0.5V
OUT_
0.90
1.2
1.20
1.6
LIM
IN
= 0V (I
= 0V (I
pulsing)
pulsing)
A
PEAK
OUT_
OUT_
OUT
OUT
Short-Circuit Current Limit
I
SHORT
0.35
A
RMS
2
_______________________________________________________________________________________
Dual USB Switch with Fault
Blanking and Autoreset
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V = V
= V
= 5V, ONA = ONB = GND (MAX1823/MAX1823A), ONA = ONB = IN (MAX1823B/MAX1823H),
IN
INA
INB
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Short-Circuit Detect Threshold
(Note 1)
1
V
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT_ assertion
10
20
35
ms
ms
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT_ assertion
7.5
18
35.0
R
= 10kΩ,
OUT_
MAX1823/MAX1823H
MAX1823A/MAX1823B
0.5
0.3
1.2
4.0
3.0
Turn-On Delay
t
ms
ms
does not include
rise time
ON
0.8
2.5
Output Rise Time
t
R
R
= 10Ω, from 10% to 90% of V
OUT_ OUT_
RISE
_ = 10Ω, does not include fall time (from
OUT
ON_ (MAX1823) or ON_ (MAX1823H)
0.8
3.0
3.0
deasserted to V = 90% of V
)
IN_
OUT
Turn-Off Delay from ON
t
ms
ms
OFF
R
_ = 10Ω, does not include fall time (from
OUT
ON_ (MAX1823A) or ON_ (MAX1823B)
deasserted to V = 90% of V
0.1
2.5
)
IN_
OUT
R
= 10Ω, from 90% to 10% of V
OUT_
OUT_
OUT_
(MAX1823/MAX1823H)
Output Fall Time
t
FALL
R
= 10Ω, from 90% to 10% of V
OUT_
2.8
(MAX1823A/MAX1823B)
15oC hysteresis
Thermal-Shutdown Threshold
Logic Input High Voltage
Logic Input Low Voltage
+160
oC
V
V
V
= 4V to 5.5V
= 4V to 5.5V
2
IN_
IN_
0.8
+1
0.4
1
V
ON_ = GND or IN_ (MAX1823/MAX1823A),
ON_ = GND or IN_ (MAX1823B/MAX1823H)
Logic Input Current
-1
µA
V
FAULT_ Output Low Voltage
I
= 1mA, V _ = 4V
SINK IN
FAULT_ Output High Leakage
Current
V
_ = V
= 5.5V
FAULT_
µA
IN
Autoreset OUT_ Current
Autoreset Threshold
In latched-off state, V
= 0V
10
0.4
10
30
0.5
20
45
0.6
35
mA
V
OUT_
In latched-off state, rising
In latched-off state, V
Autoreset Blanking Time
> 0.5V
ms
OUT_
_______________________________________________________________________________________
3
Dual USB Switch with Fault
Blanking and Autoreset
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V = V _ = V _ = 5V (MAX1823B/MAX1823H); V = V _ = 5V, ON_ = GND (MAX1823/MAX1823A), T = -40°C
IN
IN
ON
IN
IN
A
to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
Supply Voltage Range
4.0
V
Each switch, MAX1823/MAX1823H
Each switch, MAX1823A/MAX1823B
135
165
Switch On-Resistance
Standby Supply Current
R
mΩ
ON
ON_ = IN_ (MAX1823/MAX1823A),
ON_ = GND (MAX1823B/MAX1823H)
10
µA
I
I
= I
= 0A, one channel on
= 0A, both channels on
80
OUTA
OUTA
OUTB
OUTB
Quiescent Supply Current
OUT_ Off-Leakage Current
µA
= I
100
ON_ = IN_ (MAX1823/MAX1823A),
ON_ = GND (MAX1823B/MAX1823H),
10
µA
V
= V
= 0V
OUTA
OUTB
Undervoltage-Lockout Threshold
Continuous Load Current
V
Rising edge, 3% hysteresis
3.0
720
0.72
0.8
3.8
V
mA
A
UVLO
Continuous Current Limit
I
V
V
- V = 0.5V
OUT_
1.20
1.6
LIM
IN_
Current Limit into Short Circuit
I
= 0V (I
pulsing)
A
SHORT
OUT_
OUT
PEAK
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT_ assertion
10
35
ms
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT_ assertion
7.5
35.0
ms
ms
R
= 10kΩ,
OUT_
MAX1823/MAX1823H
MAX1823A/MAX1823B
0.5
0.3
4.0
3.0
Turn-On Delay
t
does not include
rise time
ON
R
= 10Ω, does not include fall time
OUT_
(from ON_ (MAX1823/MAX1823A) or ON_
(MAX1823B/MAX1823H) deasserted to
Turn-Off Delay from ON
t
3
ms
OFF
V
= 90% V
)
IN_
OUT_
4
_______________________________________________________________________________________
Dual USB Switch with Fault
Blanking and Autoreset
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V = V _ = V _ = 5V (MAX1823B/MAX1823H); V = V _ = 5V, ON_ = GND (MAX1823/MAX1823A), T = -40°C
IN
IN
ON
IN
IN
A
to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
SYMBOL
CONDITIONS
= 4V to 5.5V
MIN
TYP
MAX
UNITS
V
V
V
2
V
V
IN_
IN_
= 4V to 5.5V
0.8
+1
0.4
= 0V or V
-1
µA
V
ON_
SINK
IN_
IN_
FAULT_ Output Low Voltage
I
= 1mA, V
= 4V
FAULT_ Output High Leakage
Current
V
= V
= 5.5V
FAULT_
1
µA
IN_
Autoreset OUT_Current
Autoreset Threshold
In latched-off state, V
= 0V
10
0.4
10
50
0.6
35
mA
V
OUT_
In latched-off state, rising
In latched-off state, V
Autoreset Blanking Time
> 0.5V
ms
OUT_
Note 1: The output voltage at which the device transitions from short-circuit current limit to continuous current limit.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
Note 3: Reverse current (current from OUT_ to IN_) is blocked when disabled.
Note 4: Forward current (current from IN_ to OUT_) is internally limited. Reverse current, from OUT_ to IN_, is not limited when the
device is enabled and must be kept below 1.5A to prevent permanent device damage. When the MAX1823A/MAX1823B
RMS
are disabled, the switch turns off and reverse current is internally blocked.
Typical Operating Characteristics
(Circuit of Figure 1, V = V
IN
unless otherwise noted.)
= V
= 5V, ON_ = GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), T = +25°C,
INA
INB
A
QUIESCENT CURRENT
vs. TEMPERATURE
vs. TEMPERATURE
QUIESCENT CURRENT
vs. INPUT VOLTAGE
SHUTDOWN SUPPLY CURRENT
60
54
48
42
55
53
51
49
47
45
3.5
3.3
3.1
2.9
2.7
2.5
ON_ = IN_ (MAX1823/MAX1823A)
ON_ = GND (MAX1823B/MAX1823H)
V
_
= 5.5V
IN
36
30
V
_
IN
= 5V
24
18
12
6
V
_
= 4.5V
IN
0
0
1
2
3
4
5
6
-40
-15
10
35
60
85
-40
-15
10
35
60
85
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
Dual USB Switch with Fault
Blanking and Autoreset
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V = V
IN
unless otherwise noted.)
= V
= 5V, ON_ = GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), T = +25°C,
INA
INB
A
CONTINUOUS CURRENT-LIMIT
THRESHOLD vs. TEMPERATURE
SWITCH OFF-LEAKAGE
vs. TEMPERATURE
NORMALIZED RON vs. TEMPERATURE
1000
100
1.50
1.25
1.00
0.75
0.50
940
930
920
910
900
V
IN_ = 5.5V
10
1
V
IN_ = 5V
V
IN_ = 4.5V
0.1
0.01
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
TURN-OFF TIME
FAULT-BLANKING TIME
vs. TEMPERATURE
TURN-ON TIME
vs. TEMPERATURE (t
+ t
)
FALL
vs. TEMPERATURE (t + t
)
OFF
ON
RISE
3.5
22.0
21.8
21.6
21.4
21.2
21.0
4.0
3.3
3.1
2.9
2.7
2.5
3.8
3.6
3.4
3.2
3.0
V
_ = 4.5V
IN
V
_ = 5V
IN
V
_ = 5.5V
IN
V
IN
_ = 4.5V
V
_ = 5V
IN
V
_ = 5V
IN
V
_
IN
= 5.5V
35
V
_
IN
= 5.5V
-15
V
_ = 4.5V
IN
-40
-15
10
35
60
85
-40
-15
10
60
85
-40
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
AUTORESET CURRENT vs. TEMPERATURE
(MAX1823/MAX1823H)
AUTORESET CURRENT vs. TEMPERATURE
(MAX1823A/MAX1823B)
FAULT_ OUTPUT LOW VOLTAGE
vs. TEMPERATURE
0.250
0.225
0.200
0.175
0.150
0.125
0.100
40
36
34
32
30
I
_ = 1mA
FAULT
V
_ = 5.5V
IN
V
_ = 5V
IN
35
30
25
20
15
V
_
= 5.5V
= 5V
IN
V _ = 4.5V
IN
V
_
IN
V
_ = 5.5V
IN
V
_ = 5V
IN
V _ = 4.5V
IN
V
_ = 4.5V
IN
28
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
6
_______________________________________________________________________________________
Dual USB Switch with Fault
Blanking and Autoreset
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V = V
IN
unless otherwise noted.)
= V
= 5V, ON_ = GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), T = +25°C,
INA
I
N
B
A
OVERLOAD RESPONSE INTO 2.5Ω
AUTORESET CURRENT vs. INPUT VOLTAGE
(MAX1823/MAX1823H)
AUTORESET CURRENT vs. INPUT VOLTAGE
(MAX1823A/MAX1823B)
(MAX1823/MAX1823H)
MAX1823 toc15
50
40
30
20
10
0
39
37
35
33
31
A
B
T
= -40°C
5V
0
A
T
= +25°C
A
T
= +85°C
A
T
= +25°C
A
C
D
0
0
T
= +85°C
A
29
27
T
= -40°C
A
25
10ms/div
C: V
3.6
4.4
5.2
6.0
3.6
4.4
5.2
6.0
A: V , 5V/div
, 5V/div
FAULTA
IN_
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
B: V
, 5V/div D: I
, 1A/div
OUTA
OUTA
OVERLOAD RESPONSE INTO 2.5Ω
OVERLOAD RESPONSE INTO 2.5Ω
SHORT-CIRCUIT RESPONSE INTO 0Ω
(EXPANDED TIME SCALE)
(MAX1823A/MAX1823B ONLY)
(MAX1823/MAX1823H)
MAX1823 toc17
MAX1823 toc16
MAX1823 toc18
A
B
5V
5V
0
5V
0
A
A
B
B
0
C
C
C
D
0
0
0
0
0
0
D
D
500µs/div
C: V
10ms/div
C: V
10ms/div
A: V , 5V/div
, 5V/div
FAULTA
IN_
A: V , 5V/div
, 5V/div
FAULTA
IN_
B: V
A: V _, 5V/div
C: V
D: I
, 5V/div
IN
FAULTA
B: V
, 5V/div
D: I
, 1A/div
OUTA
OUTA
, 5V/div D: I
, 1A/div
OUTA
OUTA
B: V
, 5V/div
, 1A/div
OUTA
OUTA
SWITCH TURN-ON TIME
(MAX1823/MAX1823A)
SHORT-CIRCUIT RESPONSE INTO 0Ω
SHORT-CIRCUIT RESPONSE INTO 0Ω
(MAX1823A/MAX1823B)
(EXPANDED TIME SCALE)
MAX1823 toc21
MAX1823 toc19
MAX1823 toc20
A
5V
5V
0
A
B
A
B
0
B
0
5V
C
C
D
0
0
D
0
0
1ms/div
500µs/div
10ms/div
C: V
A: V , 5V/div
ONA
A: V , 5V/div
C: V
D: I
, 5V/div
A: V _, 5V/div
, 5V/div
FAULTA
IN_
B: V
FAULTA
B: V
, 2V/div
IN
OUTA
OUTA
, 5V/div
, 2A/div
B: V
, 5V/div
D: I
, 2A/div
OUTA
OUTA
OUTA
_______________________________________________________________________________________
7
Dual USB Switch with Fault
Blanking and Autoreset
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V = V
IN
unless otherwise noted.)
= V
= 5V, ON_ = GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), T = +25°C,
INA
INB
A
STARTUP TIME
(TYPICAL USB APPLICATION)
SWITCH TURN-OFF TIME
(t + t
)
FALL
OFF
MAX1823 toc23
MAX1823 toc22
A
B
0
A
B
5V
0
C
D
0
0
0
500µs/div
C: V
1ms/div
A: V , 5V/div
, 2V/div
OUTA
ONA
A: V , 5V/div
OUTA
ONA
B: V
, 5V/div
D : I
, 0.5A/div
FAULTA
OUTA
B: V
, 2V/div
Pin Description
PIN
NAME
FUNCTION
ONA
*(ONA)
Control Input for Switch A. Can be driven higher than IN_ without damage. A logic low turns switch A on for
the MAX1823/MAX1823A, and a logic high turns switch A on for the MAX1823B/MAX1823H.
1
INA, IN,
INB
Power Input. Connect all IN_ pins together, and bypass with a 0.1µF capacitor to ground. Load
conditions may require additional bulk capacitance to prevent the input from being pulled down.
2, 3, 4
ONB
*(ONB)
Control Input for Switch B. Can be driven higher than IN_ without damage. A logic low turns switch B
on for the MAX1823/MAX1823A, and a logic high turns switch B on for the MAX1823B/MAX1823H.
5
6
Fault-Indicator Output for Switch B. This open-drain output goes low when switch B is in thermal
shutdown or UVLO or in a sustained (>20ms) current-limit or short-circuit condition.
FAULTB
Power Output for Switch B. Connect a 1µF capacitor from OUTB to ground. Load condition may
require additional bulk capacitance.
7
8
9
OUTB
GND
Ground
Power Output for Switch A. Connect a 1µF capacitor from OUTA to ground. Load condition may
require additional bulk capacitance.
OUTA
Fault-Indicator Output for Switch A. This open-drain output goes low when switch A is in thermal
shutdown or UVLO or in a sustained (>20ms) current-limit or short-circuit condition.
10
FAULTA
*() are for the MAX1823B/MAX1823H only.
8
_______________________________________________________________________________________
Dual USB Switch with Fault
Blanking and Autoreset
Thermal Shutdown
Detailed Description
The MAX1823 features independent thermal shutdown
for each switch channel, allowing one switch to deliver
power even if the other switch has a fault condition.
When the junction temperature exceeds +160°C, the
switch turns off and the FAULT_ output goes low imme-
diately; fault blanking does not occur during thermal
limit. When the junction cools by 15°C, the switch turns
on again. If the fault overload condition continues, the
switch cycles on and off, resulting in a pulsed output,
saving battery power.
The MAX1823 is a dual, current-limited switch designed
for USB applications. It has two independent switches,
each with its own enable control input and autoreset
function. Each switch has an error-flag output to notify
the USB controller when the current-limit, short-circuit,
undervoltage-lockout, or thermal-shutdown threshold is
reached (Figure 2).
The MAX1823 operates from a 4V to 5.5V input voltage
range and guarantees a minimum 720mA output current.
A built-in 0.9A current limit limits the current in the event
of a heavy-overload condition. The MAX1823 has inde-
pendent thermal shutdown for each switch in the event
of a prolonged overload or short-circuit condition. The
autoreset function monitors the overload and automati-
cally turns the switch on when the overload is removed.
Reverse Current Blocking
The USB specification does not allow an output device
to source current back into the USB port. However, the
MAX1823A/MAX1823B are designed to safely power
noncompliant devices. When disabled, each output is
switched to a high-impedance state, blocking reverse
current flow from the output back to the input. However,
during normal operation with the device enabled, the
MAX1823A/MAX1823B are bidirectional switches.
Use of low-R
NMOS switches enables the MAX1823
ON
to provide two switches in the ultra-small 10-pin µMAX
package. An internal micropower charge pump gener-
ates the high-side supply needed for driving the gates
of these high-side switches. Separate current-limiting
and thermal-shutdown circuits permit each switch to
operate independently, improving system robustness.
Fault Indicators
The MAX1823 provides an open-drain fault output
(FAULT_) for each switch. For most applications, connect
FAULT_ to IN_ through a 100kΩ pullup resistor. FAULT_
goes low when any of the following conditions occur:
Undervoltage-Lockout and
Input-Voltage Requirements
•
•
The input voltage is below the UVLO threshold.
The MAX1823 includes a UVLO circuit to prevent erro-
neous switch operation when the input voltage goes
low during startup and brownout conditions. Operation
The switch junction temperature exceeds the
+160°C thermal-shutdown temperature limit.
The switch is in current-limit or short-circuit limit
mode after the fault-blanking period is exceeded.
is inhibited when V
is less than 3.4V.
IN_
•
•
Output Fault Protection
The MAX1823 senses the switch output voltage and
The switch is in autoreset mode.
selects continuous current limiting when V
is greater
OUT
OUT
than 1V or short-circuit current limiting when V
is less
than 1V. When V
is greater than 1V, the device oper-
OUT
ates in a continuous current-limit mode that sets the out-
put current limit to 0.9A. When V is less than 1V, the
USB
INA
IN
OUTA
PORT A
OUT
1µF*
device operates in short-circuit current-limit mode,
sourcing 0.35A current pulses to the load.
INPUT
4V TO 5.5V
INB
RMS
0.1µF
100kΩ
Autoreset Mode
MAX1823
If an output fault is detected for more than the 20ms
blanking time, the output latches off, the FAULT_ output
goes low, and a 25mA current is forced at the output. If
the voltage on the output exceeds 0.5V for 20ms, the fault
resets, the 25mA current source shuts down, and the out-
put turns on. The device monitors the output voltage so
that a short-circuit condition can be detected. Active
loads are not expected to have measurable currents
when the supply is below 0.5V. The MAX1823/MAX1823A
can also be reset from fault manually by toggling ON_
(ON_ for the MAX1823B/MAX1823H) for that channel.
USB
100kΩ
FAULTA
FAULTB
OUTB
PORT B
1µF*
ONA
ONB
ONA
ONB
GND
* USB APPLICATIONS MAY REQUIRE
ADDITIONAL BULK CAPACITANCE.
Figure 1. Typical Application Circuit
_______________________________________________________________________________________
9
Dual USB Switch with Fault
Blanking and Autoreset
V
less than 1V (short-circuit mode), the MAX1823
After the fault condition is removed, the FAULT_ output
deasserts after a 20ms delay. Ensure that the MAX1823
has adequate input bypass capacitance to prevent
glitches from triggering FAULT_ outputs. Input glitches
greater than 0.2V/µs may cause erroneous FAULT_
indications.
OUT_
pulses the switch, decreasing the current to 0.35A
RMS
(Table 1). Note that a thermal overload may result from
either of these high-current conditions.
The MAX1823 switches may enter current limit in nor-
mal operation when powering up or driving heavy
capacitive loads. To differentiate these conditions from
short circuits or sustained overloads that may damage
the device, the MAX1823 has an independent fault-
blanking circuit in each switch. When a load transient
causes the device to enter current limit, an internal
counter starts to monitor the duration of the fault. For
load faults exceeding 20ms fault-blanking time, the
switch turns off, the FAULT_ signal asserts low, and the
device enters autoreset mode (see the Autoreset Mode
section). Only current-limit and short-circuit faults are
blanked. Thermal-overload faults and input voltage
drops below the UVLO threshold immediately cause
the switch to turn off and FAULT_ to assert low.
Behavior During Current Limit
and Fault Blanking
The MAX1823 limits switch current in three ways. When
ON_ is deasserted (high for MAX1823/MAX1823A, low
for MAX1823B/MAX1823H), the switch is off and leak-
age dominates the residual output current. When ON_
is asserted (low for MAX1823/MAX1823A, high for
MAX1823B/MAX1823H), the switch supplies a continu-
ous output current of at least 720mA. When the output
current exceeds the 0.9A threshold, the MAX1823 lim-
its the current depending on the output voltage. For
V
greater than 1V (current-limit mode), the
OUT_
MAX1823 regulates the output current to 0.9A. For
INA
FAULTA
INA
ONA
CHARGE
PUMP
*(ONA)
ILIM
BIAS
OUTA
1µF
THERMAL
SHUTDOWN
UVLO
25mA
REF
FAULT
LOGIC
GND
4V TO 5.5V
IN_
TIMER
20ms
OSC
25mA
ILIM
0.1µF
25kHz
OUTB
1µF
MAX1823/MAX1823A
MAX1823B/MAX1823H
*(ONB)
CHARGE
PUMP
ONB
INB
INB
FAULTB
*( ) ARE FOR THE MAX1823B/MAX1823H.
Figure 2. Functional Diagram
10 ______________________________________________________________________________________
Dual USB Switch with Fault
Blanking and Autoreset
Table 1. MAX1823 Current Limiting and Fault Behavior
CONDITION
MAX1823 BEHAVIOR
•
•
An output short circuit ramps the current to I
blanking timer turns on, FAULT_ stays high, and the output current pulses at 0.35A
Removing the short circuit before the 15ms short-circuit blanking timeout period allows the
next ramped current pulse to soft-start the output. The FAULT_ flag stays high.
A short circuit exceeding 15ms to 20ms forces FAULT_ low at 20ms, enables autoreset
mode, and sources 25mA at the output.
An output voltage above 0.5V for 20ms resets the switch, turns on the output, and forces
in 2ms to 3ms, the switch shuts off, the
SHORT
.
RMS
Output short circuit
OUT
(V
< 1V)
•
•
FAULT_ high.
•
An output overload regulates the current at I
overload is removed, a thermal fault occurs, or the 20ms continuous current-limit timeout
period is reached.
(0.9A), and FAULT_ stays high until the
LIM
Output overload current
(V > 1V)
•
•
An overcurrent condition still present at 20ms forces FAULT_ low, enables autoreset, and
sources 25mA at the output.
An output voltage above 0.5V for 20ms resets the switch, turns on the output, and forces
OUT
FAULT_ high.
•
•
A junction temperature of +160°C immediately forces FAULT_ low (the blanking timer does
not apply to thermal faults) and turns off the switch. The junction cooling 15°C removes the
thermal fault condition, enables autoreset mode, and sources 25mA at the output. FAULT_
remains low while a thermal fault condition is present.
An output voltage above 0.5V for 20ms resets the switch, turns on the output, and forces
Thermal fault
(T > +160°C)
J
FAULT_ high.
Fault blanking allows the MAX1823 to handle USB loads
that may not be fully compliant with the USB specifica-
tions. USB loads with additional bypass capacitance
and/or large startup currents can be successfully pow-
ered even while protecting the upstream power source.
No fault is indicated if the switch is able to bring up the
load within the 20ms blanking period.
Output Capacitor
Place a 1µF or greater capacitor at each output for noise
immunity. When starting up into very large capacitive
loads, the switch pulses the output current at 0.35A
RMS
until the output voltage rises above 1V, then the capacitor
continues to charge at the full 0.9A current limit. There is
no limit to the output capacitor size, but to prevent a start-
up fault assertion, the capacitor must charge up within
the fault-blanking delay period. Typically, starting up into
a 330µF or smaller capacitor does not trigger a fault out-
put. In addition to bulk capacitance, small-value (0.1µF or
greater) ceramic capacitors improve the output’s
resilience to electrostatic discharge (ESD).
Applications Information
Input Power Source
IN, INA, and INB provide the power for all control and
charge-pump circuitry. All three IN_ pins must be con-
nected together externally. The input-voltage slew rate
should be less than 0.2V/µs to prevent erroneous
FAULT_ indications. This condition should not occur
under normal USB applications.
Driving Inductive Loads
A wide variety of devices (mice, keyboards, cameras,
and printers) can load the USB port. These devices com-
monly connect to the port with cables, which can add an
inductive component to the load. This inductance causes
the output voltage at the USB port to ring during a load
step. The MAX1823 is capable of driving inductive loads,
but avoids exceeding the device’s absolute maximum rat-
ings. Usually the load inductance is relatively small, and
the MAX1823’s input includes a substantial bulk capaci-
tance from an upstream regulator as well as local bypass
capacitors, limiting overshoot. If severe ringing occurs
due to large load inductance, clamp the MAX1823’s out-
put below 6V and above -0.3V.
Input Capacitor
Connect a capacitor from IN_ to ground to limit the input
voltage drop during momentary output short-circuit con-
ditions. A 0.1µF ceramic capacitor is required for local
decoupling; higher capacitor values further reduce the
voltage drop at the input (see the Typical Application
Circuit (Figure 1)). When driving inductive loads, a larg-
er capacitance prevents voltage spikes from exceeding
the MAX1823’s absolute maximum ratings.
______________________________________________________________________________________ 11
Dual USB Switch with Fault
Blanking and Autoreset
For a 5V input and 1V output, the maximum power dis-
sipation per switch is:
P = (1.2A) ( 5V - 1V) = 4.8W
Turn-On and Turn-Off Behavior
In the absence of faults, the MAX1823’s internal switches
turn on and off slowly under the control of the ON_
inputs. Transition times for both edges are provided in
the Electrical Characteristics table. The slow charge-
pump switch drive minimizes load transients on the
upstream power source. Under thermal fault and UVLO,
the power device turns off rapidly (100ns) to protect the
power device.
Since the package power dissipation is only 444mW,
the MAX1823 die temperature exceeds the thermal-
shutdown threshold, and the switch output shuts down
until the junction temperature cools by 15°C. The duty
cycle and period are strong functions of the ambient
temperature and the PC board layout.
Layout and Thermal Dissipation
To optimize the switch response time to output short-
circuit conditions, keep all traces as short as possible
to reduce the effect of undesirable parasitic induc-
tance. Place input and output capacitors no more than
5mm from device leads. All IN_ and OUT_ pins must be
connected with short traces to the power bus. Wide
power-bus planes provide superior heat dissipation
through the switch IN_ and OUT_ pins.
A short circuit at the output causes the power dissipated
across the switch and the junction temperature to
increase. If the fault condition persists, the thermal-
overload-protection circuitry activates, and the output
shuts down until the junction temperature decreases by
15°C (see the Thermal Shutdown section).
Since the output short-circuit current is 25mA (typ), and
with V
= 5V, calculate the power dissipation for a
IN_
short-circuited output as follows:
While the switches are on, power dissipation is small, and
the package temperature change is minimal. Calculate
the power dissipation for this condition as follows:
2
P = (0.025A)(5) = 0.125W
P = (I
) R
OUT_ ON
For the normal operating current (I
= 0.5A), and
OUT_
Chip Information
the maximum on-resistance of the switch (135mΩ), the
TRANSISTOR COUNT: 3227
power dissipation is:
PROCESS: BiCMOS
2
P = (0.5A) x 0.135Ω = 34mW per switch
The worst-case power dissipation occurs when the
switch is in current limit and the output is greater than
1V. In this case, the power dissipated in each switch is
the voltage drop across the switch multiplied by the
current limit:
P = (I ) (V - V )
OUT
LIM
IN
12 ______________________________________________________________________________________
Dual USB Switch with Fault
Blanking and Autoreset
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
e
4X S
10
10
INCHES
MAX
MILLIMETERS
MAX
1.10
0.15
0.95
3.05
3.00
3.05
3.00
5.05
0.70
DIM MIN
MIN
-
A
-
0.043
0.006
0.037
0.120
0.118
0.120
0.118
0.199
A1
A2
D1
D2
E1
E2
H
0.002
0.030
0.116
0.114
0.116
0.114
0.187
0.05
0.75
2.95
2.89
2.95
2.89
4.75
0.40
H
ÿ 0.50 0.1
0.6 0.1
L
0.0157 0.0275
0.037 REF
L1
b
0.940 REF
0.007
0.0106
0.177
0.270
0.200
1
1
e
0.0197 BSC
0.500 BSC
0.6 0.1
c
0.0035 0.0078
0.0196 REF
0.090
BOTTOM VIEW
0.498 REF
S
α
TOP VIEW
0∞
6∞
0∞
6∞
D2
E2
GAGE PLANE
A2
c
A
E1
b
L
α
A1
D1
L1
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0061
I
1
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
ENG LIS H • ? ? ? ? • ? ? ? • ? ? ?
WH AT' S N EW
PRO DU CT S
S OL UT IO NS
D ESIGN
A PPNOTES
SU PPORT
B U Y
CO MPA N Y
M EMB ERS
M a x i m > P r o d u c t s > P o w e r a n d B a t t e r y M a n a g e m e n t
M A X 1 8 2 3 , M A X 1 8 2 3 A , M A X 1 8 2 3 B , M A X 1 8 2 3 H
D u a l U S B S w i t c h w i t h F a u l t B l a n k i n g a n d A u t o r e s e t
Q u i c k V i e w
T
e
c
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a
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D
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m
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t
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i
n
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I
n
f
o
M o r e I n f o r m a t i o n
A l l
O r d e r i n g I n f o r m a t i o n
N o t e s :
1 . O t h e r o p t i o n s a n d l i n k s f o r p u r c h a s i n g p a r t s a r e l i s t e d a t : h t t p : / / w w w . m a x i m - i c . c o m / s a l e s .
2 . D i d n ' t F i n d W h a t Y o u N e e d ? A s k o u r a p p l i c a t i o n s e n g i n e e r s . E x p e r t a s s i s t a n c e i n f i n d i n g p a r t s , u s u a l l y w i t h i n o n e
b u s i n e s s d a y .
3 . P a r t n u m b e r s u f f i x e s : T o r T & R = t a p e a n d r e e l ; + = R o H S / l e a d - f r e e ; # = R o H S / l e a d - e x e m p t . M o r e : S e e F u l l D a t a
S h e e t o r P a r t N a m i n g C o n v e n t i o n s .
4 . * S o m e p a c k a g e s h a v e v a r i a t i o n s , l i s t e d o n t h e d r a w i n g . " P k g C o d e / V a r i a t i o n " t e l l s w h i c h v a r i a t i o n t h e p r o d u c t
u s e s .
D e v i c e s : 1 - 1 6 o f 1 6
M A X 1 8 2 3
F r e e
B uy
B uy
B uy
T e m p
R o H S/ L e a d - F r e e ?
M a t e r i a l s A n a l y s i s
P a c k a g e : TY PE PI NS F O OTPRI NT
S
a
m
p
l
e
D RA WI NG C OD E/ VA R *
M A X 1 8 2 3 E U B + T
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
M A X 1 8 2 3 E U B +
M A X 1 8 2 3 E U B
M A X 1 8 2 3 E U B - T
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 - 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : N o
M a t e r i a l s A n a l y s i s
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 - 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : N o
M a t e r i a l s A n a l y s i s
M
A
X
1
8
2
3
A
F
r
e
e
T e m p
R o H S/ L e a d - F r e e ?
M a t e r i a l s A n a l y s i s
P a c k a g e : TY PE PI NS F O OTPRI NT
S
a
m
p
l
e
D RA WI NG C OD E/ VA R *
M A X 1 8 2 3 A E U B
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 - 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : N o
M a t e r i a l s A n a l y s i s
M A X 1 8 2 3 A E U B - T
M A X 1 8 2 3 A E U B + T
M A X 1 8 2 3 A E U B +
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 - 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : N o
M a t e r i a l s A n a l y s i s
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
M A X1 823B
F r e e
T e m p
R o H S/ L e a d - F r e e ?
M a t e r i a l s A n a l y s i s
P a c k a g e : TY PE PI NS F O OTPRI NT
Sa m p l e
D RA WI NG C OD E/ VA R *
M A X 1 8 2 3 B E U B + T
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
M A X 1 8 2 3 B E U B +
M A X 1 8 2 3 B E U B - T
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : N o
M a t e r i a l s A n a l y s i s
U s e p k g c o d e / v a r i a t i o n : U 1 0 - 2 *
M A X 1 8 2 3 B E U B
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : N o
M a t e r i a l s A n a l y s i s
U s e p k g c o d e / v a r i a t i o n : U 1 0 - 2 *
M A X1 823H
F r e e
B uy
T e m p
R o H S/ L e a d - F r e e ?
M a t e r i a l s A n a l y s i s
P a c k a g e : TY PE PI NS F O OTPRI NT
Sa m p l e
D RA WI NG C OD E/ VA R *
M A X 1 8 2 3 H E U B + T
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
M A X 1 8 2 3 H E U B - T
M A X 1 8 2 3 H E U B +
M A X 1 8 2 3 H E U B
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 - 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : N o
M a t e r i a l s A n a l y s i s
u M A X ; 1 0 p i n ; 1 5 m m
D w g : 2 1 - 0 0 6 1 J ( P D F )
U s e p k g c o d e / v a r i a t i o n : U 1 0 + 2 *
- 4 0 C t o + 8 5 C R o H S / L e a d - F r e e : L e a d F r e e
M a t e r i a l s A n a l y s i s
u M A X ; 1 0 p i n ; 1 5 m m
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T e c h n i c a l D o c u m e n t s
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R e l i a b i l i t y R e p o r t s
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E v a l u a t i o n K i t s
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R e l a t e d P r o d u c t s
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D i a g r a m
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C O N T A C T U S : S E N D U S A N E M A I L
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相关型号：
MAX1823AEUB+
Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO10, LEAD FREE, MICRO, SOP-10
MAXIM
MAX1823AEUB+T
Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO10, LEAD FREE, MICRO, SOP-10
MAXIM
MAX1823BEUB+
Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO10, LEAD FREE, MICRO, SOP-10
MAXIM
MAX1823EUB+T
Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO10, LEAD FREE, MICRO, SOP-10
MAXIM
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