MIC2070-2PCQS

Controllers Overview

The MIC2070-2PCQS is a dual-channel USB power controller manufactured by Micrel, designed to manage power distribution for USB wakeup from the ACPI S3 state. It integrates two independent switches that transition between a 5V main supply and a 5V auxiliary supply based on the S3# control input. The device features make-before-break switching for glitch-free transitions and bi-level current limiting to preserve auxiliary supply regulation during standby. In active states, it provides a minimum 500mA current limit, while in standby, the threshold is adjustable via external resistors. The MIC2070 variant includes circuit breaker functionality that latches outputs off upon overcurrent conditions lasting more than 5ms.

Controllers Feature Summary

• Integrated switching matrix supports ACPI S0/S3 state transitions without external FET circuits
• Circuit breaker options with auto-reset (MIC2070) and latch-off capability
• Thermally isolated channels prevent fault propagation between outputs
• Fault status outputs with filter prevents false assertions during hot-plug events

Controllers Applications

• Desktop PCs
• Notebook PCs
• Notebook docking stations
• LAN Servers
• PC motherboard

Controllers Procurement Notes

Verify the manufacturer origin as Micrel, Inc., not Microchip Technology, despite potential catalog listings under the latter due to acquisition history. Confirm the package type is 16-lead QSOP and the operating temperature range is 0°C to +70°C. Ensure the specific suffix '2PCQS' matches the required active-low enable function and circuit breaker behavior documented in the official datasheet.

Controllers Selection Notes

Select this component when designing systems requiring compliant USB power distribution with ACPI S3 wakeup support. Choose the MIC2070 variant specifically if circuit breaker mode is needed to reduce power consumption during faults. The '-2' suffix indicates an active-low enable input, which must be accounted for in logic design compared to the active-high '-1' version. Ensure RSET resistor values are calculated to set the desired AUX mode current limit.

Controllers Part Context

This part belongs to the MIC2010/2070 family of USB power controllers. The MIC2010 offers automatic reset upon thermal cooldown, whereas the MIC2070 provides a latched output off state upon overcurrent detection. Both share identical electrical characteristics for switching and protection but differ in their fault recovery mechanisms. The MIC2070-2PCQS specifically denotes the active-low enable configuration within the 0°C to +70°C commercial temperature grade.

Controllers Replacement Considerations

The MIC2010-2PCQS is a functional alternative if circuit breaker latching is not required and automatic thermal reset is preferred. Other variants like MIC2070-1PCQS offer the same features but with active-high enable inputs. Verify pin compatibility and electrical specifications before substitution.

Controllers FAQ

How does the MIC2070 handle overcurrent conditions?

The MIC2070 activates an internal circuit breaker that latches the output off if an overcurrent condition lasts longer than 5ms. The output remains off until the EN input is toggled or the load is removed.

What is the purpose of the RSET pins?

The RSET pins allow users to set the current-limit threshold in AUX mode (ACPI S3 state). The threshold is determined by approximately 18 divided by the resistance value connected to ground.

Does the device support glitch-free transitions between power states?

Yes, the MIC2070 provides make-before-break switching to ensure glitch-free transitions between the S3 and S0 states, preventing voltage drops or spikes.