MIC2070-2PZQS

Controllers Overview

The MIC2070-2PZQS 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 capability for fault protection
• Thermally isolated channels prevent cross-channel fault propagation
• 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 PZQS corresponds to the Active Low enable function and Pb-Free compliance. Cross-reference datasheet M9999-101104 for accurate electrical specifications.

Controllers Selection Notes

Select the MIC2070-2PZQS when an active-low enable signal is required for system control logic. This variant differs from the -1PZQS version only in the polarity of the EN inputs. Ensure the application requires the latching circuit breaker feature provided by the MIC2070 series rather than the auto-resetting MIC2010 series. Verify that the 16-lead QSOP package fits the PCB layout constraints.

Controllers Part Context

The MIC2070-2PZQS belongs to the MIC2010/2070 family of USB power controllers developed by Micrel. These devices are specifically engineered to meet USB power distribution specifications and support ACPI power management states. The family includes variants with different enable polarities and reset behaviors, all sharing the same core switching matrix and thermal protection architecture.

Controllers Replacement Considerations

MIC2010-2PZQS: Identical pinout and switching matrix but lacks the latching circuit breaker feature; resets automatically upon fault removal.

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 load is removed or the EN input is toggled.

What is the purpose of the RSET pins?

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

How does the device ensure glitch-free transitions between power states?

The MIC2070 uses make-before-break switching to ensure glitch-free transitions between the S3 and S0 states, preventing interruptions in power delivery during ACPI state changes.