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参数资料
| 型号： | MAX1823AEUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC SW USB DUAL W/FB 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 应用： | USB，外设 |
| 电流 - 电源： | 50µA |
| 电源电压： | 4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
Dual USB Switch with Fault
Blanking and Autoreset
Detailed Description
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.
Use of low-R ON NMOS switches enables the MAX1823
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.
Undervoltage-Lockout and
Input-Voltage Requirements
The MAX1823 includes a UVLO circuit to prevent erro-
neous switch operation when the input voltage goes
low during startup and brownout conditions. Operation
is inhibited when V IN_ is less than 3.4V.
Output Fault Protection
The MAX1823 senses the switch output voltage and
selects continuous current limiting when V OUT is greater
than 1V or short-circuit current limiting when V OUT is less
than 1V. When V OUT is greater than 1V, the device oper-
Thermal Shutdown
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.
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.
Fault Indicators
The MAX1823 provides an open-drain fault output
( FAULT_ ) for each switch. For most applications, connect
FAULT_ to IN_ through a 100k ? pullup resistor. FAULT_
goes low when any of the following conditions occur:
? The input voltage is below the UVLO threshold.
? 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.
? The switch is in autoreset mode.
ates in a continuous current-limit mode that sets the out-
put current limit to 0.9A. When V OUT is less than 1V, the
device operates in short-circuit current-limit mode,
sourcing 0.35A RMS current pulses to the load.
INPUT
4V TO 5.5V
0.1 μ F
INA
IN
INB
OUTA
USB
PORT A
1 μ F*
Autoreset Mode
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
100k ?
100k ?
ONA
ONB
MAX1823
FAULTA OUTB
FAULTB
ONA
ONB
GND
USB
PORT B
1 μ F*
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 APPLICATIONS MAY REQUIRE
ADDITIONAL BULK CAPACITANCE.
Figure 1. Typical Application Circuit
_______________________________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1823AEUB+ | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1823AEUB+T | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1823AEUB-T | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1823BEUB | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1823BEUB+ | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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