MIC2070-2PCQS-TR

Controllers Overview

The MIC2070-2PCQS-TR 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 voltage regulation during standby. In active states, it provides a minimum 500mA current limit per channel, while the auxiliary mode allows adjustable limits 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) to reduce power consumption during fault conditions
• Thermally isolated channels ensure that a fault in one channel does not affect the other
• 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., noting that Microchip Technology acquired Micrel. Confirm the package type is 16-lead QSOP and the operating temperature range is 0°C to +70°C. Ensure the part number suffix indicates the correct enable function polarity and circuit breaker configuration before procurement.

Controllers Selection Notes

Select the MIC2070 variant if circuit breaker operation with output latching upon overcurrent is required. Choose the -2P suffix for active-low enable inputs. Configure RSET resistors to set the AUX mode current-limit threshold according to the formula 18/RSET. Ensure the application operates within the specified 4.5V to 5.5V supply voltage range.

Controllers Part Context

The MIC2070 is part of the MIC2010/2070 family of USB power controllers. While the MIC2010 automatically resets upon thermal cooldown, the MIC2070 introduces a latching circuit breaker mode. This distinction makes the MIC2070 suitable for applications requiring persistent fault indication until manual or load-based reset.

Controllers Replacement Considerations

The MIC2010-2PCQS is a compatible alternative if circuit breaker latching is not required. Verify pin compatibility and electrical characteristics, particularly the current-limit thresholds and enable logic levels, when substituting between the MIC2010 and MIC2070 variants.

Controllers FAQ

How is the current-limit threshold determined in AUX mode?

In AUX mode (S3# asserted), the current-limit threshold is determined by an external resistor connected to the RSET input, calculated approximately as 18/RSET.

What triggers the latched output condition in the MIC2070?

The MIC2070 latches the output off if an overcurrent condition lasts longer than 5ms. The output can be reset by toggling the EN input or removing the load.

How does the device handle cross-conduction during state transitions?

The MIC2070 uses make-before-break switching to ensure glitch-free transitions between S3 and S0 states, minimizing cross-conduction time to typically 5-7.5ms.