MICREL MIC2072-2PCQS, MIC2072CM, MIC2072PCM, MIC2072-2CQS, MIC2072-1CQS Datasheet

September 2000 1 MIC2012/2072

MIC2012 Micrel

MIC2012/MIC2072

USB Power Controller

Advance Information

General Description

The MIC2012 is a dual channel USB power switch designed
to support the power distribution requirements for USB Wakeup
from the ACPI S3 state. The MIC2012 will directly switch its
two outputs between a 5V main supply and a 5V auxiliary
supply normally provided in ATX style power supplies.

The MIC2012 will adjust its current-limit threshold according
to the ACPI state it is in. In the normal active S0 state the
current-limit is set at 500mA minimum per channel satisfying
the USB continuous output current specification. In the S3
state the current-limit can be reduced to only 100mA per
channel to minimize the current that is supplied by the
auxiliary supply thereby ensuring that voltage regulation is
maintained even during fault conditions.

The MIC2012 provides make-before-break switching to en­sure glitch-free transitions between the S3 and S0 states.
Each channel is also thermally isolated from the other so that
a fault in one channel does not effect the other. FAULT status
output signals are also provided indicating overcurrent and
thermal shutdown conditions.

The MIC2072 option latches the output off upon detecting an
overcurrent condition for more than 5ms minimum. The
output can be reset by either toggling the EN inputs of the
MIC2072-1, -2 or by removing the load. Latching the output
off provides a circuit breaker mode of operation which re­duces power consumption during fault conditions.

T ypical Application

MIC2012P

V

BUS

D+
D–

GND

MAIN
AUX

OUT1

Downstream

USB

Port 1

100µF

5V MAIN

ATX Power Supply

S3#
FAULT1#
FAULT2#

V

BUS

D+
D–

GND

Downstream

USB

Port 2

OUT2

GND

5V STANDBY

82801AA or Equivalent

SLP S3#
SLP S5#

OC0
OC1

Overcurrent Port 1

S3 Control

Overcurrent Port 1

100µF

Figure 1. USB Wakeup with Control Input

Features

• 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 filter prevents false assertions
during hot-plug events

• Latched thermal shutdown options with auto-reset
(MIC2072)

• Undervoltage lockout

Applications

• Desktop PCs

• Notebook PCs

• Notebook Docking stations

• LAN Servers

• PC Motherboards

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com

MIC2012 Micrel

MIC2012/2072 2 September 2000

Pin Configuration

1FAULT1

S3#

AUX

GND

8FAULT2

OUT1
MAIN
OUT2

7
6
5

2
3
4

8-Pin SOIC (M)

Ordering Information

Fault Circuit Breaker Temperature

Part Number Enable Output Function Range Package

MIC2012CM n/a Open-Drain 0°C to +70°C 8-lead SOIC
MIC2012PCM* n/a Internal Pull-Up 0°C to +70°C 8-lead SOIC
MIC2012-1CQS* Active High Open-Drain 0°C to +70°C 16-lead QSOP
MIC2012-1PCQS* Active High Internal Pull-Up 0°C to +70°C 16-lead QSOP
MIC2012-2CQS* Active Low Open-Drain 0°C to +70°C 16-lead QSOP
MIC2012-2PCQS* Active Low Internal Pull-Up 0°C to +70°C 16-lead QSOP
MIC2072CM* n/a Open-Drain ✓ 0°C to +70°C 8-lead SOIC
MIC2072PCM* n/a Internal Pull-Up ✓ 0°C to +70°C 8-lead SOIC
MIC2072-1CQS* Active High Open-Drain ✓ 0°C to +70°C 16-lead QSOP
MIC2072-1PCQS* Active High Internal Pull-Up ✓ 0°C to +70°C 16-lead QSOP
MIC2072-2CQS Active Low Open-Drain ✓ 0°C to +70°C 16-lead QSOP
MIC2072-2PCQS* Active Low Internal Pull-Up ✓ 0°C to +70°C 16-lead QSOP

* Contact factory for availability.

1FAULT1

EN1

S3#

NC

AUX

NC
NC

GND

16 FAULT2

EN2
OUT1
OUT1
MAIN
MAIN
OUT2
OUT2

15
14
13
12
11
10

9

2
3
4
5
6
7
8

16-Pin QSOP (QS)

September 2000 3 MIC2012/2072

MIC2012 Micrel

Pin Description

Pin Number Pin Number Pin Name Pin Function

(MIC2012)

(MIC2012-1, -2)

1 1 FAULT1 Fault Status (Output): Internal pull-up or open-drain. Asserted LOW when

Channel is in a thermal shutdown state or overcurrent condition for more
than 5ms. MIC2072 latches this output in its asserted state upon an
overcurrent condition. Toggling EN1 or removing the load will reset the
circuit breaker latch and deassert FAULT1.

n/a 2 EN1 Enable (Input): Channel 1, active-high (–1) or active-low (–2). Toggling this

input also resets the latched output of the MIC2072.

2 3 S3# Control (Input): When this input is HIGH, the MAIN inputs are connected to

OUT1 and OUT2 via 100mΩ MOSFET switches. When this input is LOW the
AUX inputs are connected to OUT1 and OUT2 via 500mΩ MOSFET
switches.

3 5 AUX Auxiliary 5V Supply (Input): Also used as power supply for internal circuitry.

n/a 4, 6, 7 NC No Connection: This pin may be connected to other pins without restriction.

4 8 GND Ground
5 9, 10 OUT2 Channel 2 (Output): For MIC2012-1, -2 both pins must be externally

connected together.

6 11, 12 MAIN 5V Main Supply (Input): All MAIN inputs must be connected together

externally.

7 13, 14 OUT1 Channel 1 (Output): For MIC2012-1, -2 both pins must be externally

connected together.

n/a 15 EN2 Enable (Input): Channel 2, active-high (–1) or active-low (–2). Toggling this

input also resets the latched output of the MIC2072.

8 16 FAULT2 Fault Status (Output): Internal pull-up or open-drain. Asserted LOW when

Channel 2 is in a thermal shutdown state or overcurrent condition for more
than 5ms. MIC2072 latches this output in its asserted state upon an
overcurrent condition. Toggling EN2 or removing the load will reset the
circuit breaker latch and deassert FAULT2.