说明
MIC2012是一款双通道USB电源开关,旨在支持ACPI S3状态下USB唤醒的电源分配要求。MIC2012将直接在5V主电源和5V辅助电源之间切换其两个输出,通常在ATX型电源中提供。MIC2012将根据其所处的ACPI状态调整其电流限制阈值。在正常活动S0状态下,电流限制设置为每个通道最小500mA,满足USB连续输出电流规范。在S3状态下,电流限制可以降低到每个通道仅100mA,以最大限度地减少辅助电源提供的电流,从而确保即使在故障条件下也能保持电压调节。MIC2012提供先通后断切换,以确保S3和S0状态之间无故障转换。每个通道也与另一个通道热隔离,因此一个通道中的故障不会影响另一个。还提供故障状态输出信号,指示过电流和热关闭条件。MIC2072选项在检测到过电流情况时锁存输出,时间至少超过5ms。可以通过切换MIC2072-1、-2的EN输入或移除负载来重置输出。锁定输出提供了一种断路器操作模式,可降低故障条件下的功耗。
特性
- Compliant to USB power distribution specifications
- Two completely independent switches
- Integrated switching matrix supports ACPI S0/S3 state transitions without external FET circuits
- Make-before-break switching ensures glitch-free transitions
- No back-feed of auxiliary supply onto main supply during standby mode
- Bi-level current-limit preserves auxiliary supply voltage regulation in standby mode
- Thermally isolated channels
- Thermal shutdown protection
- Fault status outputs with fi lter prevents false assertions during hot-plug events
- Latched thermal shutdown options with auto-reset (MIC2072)
- Undervoltage lockout
- UL recognized
参数
类型 | 描述 |
Driver Type | USB Power Switches Supporting ACPI S0/S3 State Transitions |
Type | Dual |
Vin Min (V) | 4.5 |
Vin Max (V) | 5.5 |
Current Limit Fixed (Min) | 500mA |
Current Limited | Yes |
RDS ON @5V (mO) | 140 |
Enable Logic | Active High |
Oja (C/W) | 160 |
Rev Block Diode | Yes |
UVLO | Yes |
Thermal Shutdown | Yes |
Fault Flag | Yes |
Flag Transient Filter | Yes |
UL Approved | Yes |
Switch Element | N-Ch |
Internal Charge Pump | Yes |



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