November 29, 2001

MIC2010/2070

Micrel

MIC2010/MIC2070

USB Power Controller

Final Information

General Description

The MIC2010 is a dual channel USB power switch designed
to support the power distribution requirements for USB
Wakeup from the ACPI S3 state. The MIC2010 will directly
switch its two outputs between a 5V main supply and a 5V
auxiliary supply normally provided in ATX style power sup-
plies.

The MIC2010 will adjust its current-limit threshold according
to the ACPI state it is in. In the normal active ACPI 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 a value
determined by an external resistor to minimize the current
that is supplied by the auxiliary supply, thereby ensuring that
voltage regulation is maintained even during fault conditions.

The MIC2010 provides make-before-break switching to en-
sure 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 MIC2070 option latches the output off upon detecting an
overcurrent condition lasting for more than 5ms minimum.
The output can be reset by either toggling the EN inputs of the
MIC2070-1/-2 or by removing the load. Latching the output
off provides a circuit breaker mode of operation which re-
duces power consumption during fault conditions.

Micrel, Inc. · 1849 Fortune Drive · San Jose, CA 95131 · USA · tel + 1 (408) 944-0800 · fax + 1 (408) 944-0970 · http://www.micrel.com

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

· Circuit breaker options with auto-reset (MIC2070)
· Undervoltage lockout

Applications

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

Typical Application

MIC2010-1P/-2P

BUS

D+

GND

MAIN

AUX

OUT1

EN1

EN2

Downstream

USB

Port 1

100

5V MAIN

ATX Power Supply

S3#

FAULT1

BUS

D+

GND

Downstream

USB

Port 2

OUT2

RSET1

RSET2

GND

5V STANDBY

82801AA or Equivalent

SLP S3#

SLP S5#

OC0

OC1

Overcurrent Port 1

ON/OFF 1

ON/OFF 2

100

S3# CONTROL

Figure 1. USB Wakeup From ACPI S3 System Diagram

UL Recognized Component

MIC2010/2070

Micrel

MIC2010/2070

November 29, 2001

Pin Configuration

FAULT1

EN1

S3#

RSET1

AUX

RSET2

GND

16 FAULT2

EN2

OUT1

MAIN

OUT2

16-Pin QSOP (QS)

Ordering Information

Fault

Circuit Breaker

Temperature

Part Number

Enable

Output

Function

Range

Package

MIC2010-1CQS*

Active High

Open-Drain

C to +70

16-lead QSOP

MIC2010-1PCQS*

Active High

Internal Pull-Up

C to +70

16-lead QSOP

MIC2010-2CQS*

Active Low

Open-Drain

C to +70

16-lead QSOP

MIC2010-2PCQS

Active Low

Internal Pull-Up

C to +70

16-lead QSOP

MIC2070-1CQS

Active High

Open-Drain

C to +70

16-lead QSOP

MIC2070-1PCQS*

Active High

Internal Pull-Up

C to +70

16-lead QSOP

MIC2070-2CQS*

Active Low

Open-Drain

C to +70

16-lead QSOP

MIC2070-2PCQS*

Active Low

Internal Pull-Up

C to +70

16-lead QSOP

* Contact factory for availability.

November 29, 2001

MIC2010/2070

Micrel

Pin Description

Pin Number

Pin Name

Pin Function

FAULT1

Fault Status (Output): Channel 1, active-low; weak pull-up to AUX or open-
drain. FAULT1 is asserted LOW when channel 1 is in a thermal shutdown
state or overcurrent condition for more than 5ms. MIC2070 latches this
output in its asserted state upon overcurrent condition. Toggling EN1 or
removing the load will reset the circuit breaker latch, and deassert FAULT1.

EN1

Enable (Input): Channel 1, active-high (1) or active-low (2). Toggling this
input also resets the latched output of the MIC2070.

S3#

Control (Input): When this input is high, the MAIN inputs are connected to
OUT1 and OUT2 via 100m

, 500mA MOSFET switches. When this input is

LOW, the AUX inputs are connected to OUT1 and OUT2 via 500m

MOSFET switches with a current-limit threshold specified by external
resistors, RSET1 and RSET2.

RSET1

Current-Limt Set Resistor (Input): Channel 1. A resistor connected to this
input sets the current-limit threshold in AUX mode (S3# asserted). The
current-limit threshold is determined by approximately 18/RSET1.

AUX

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

No Connection: This pin may be connected to other pins without restriction.

RSET2

Current-Limit Set Resistor (Input): Channel 2. A resistor connected to this
input sets the current-limit threshold in AUX mode (S3# asserted). The
current-limit threshold is determined by approximately 18/RSET2.

GND

Ground

9, 10

OUT2

Channel 2 (Output): Both pins must be connected together externally.

11, 12

MAIN

5V Main Supply (Input): All MAIN inputs must be connected together
externally.

13, 14

OUT1

Channel 1 (Output): Both pins must be connected together externally.

EN2

Enable (Input): Channel 2, active-high (1) or active-low (2). Toggling this
input also resets the latched output for the MIC2070.

FAULT2

Fault Status (Output): Channel 2, active-low; weak pull-up to AUX or open-
drain. FAULT2 is asserted LOW when channel 2 is in a thermal shutdown
state or overcurrent condition for more than 5ms. MIC2070 latches this
output in it's asserted state upon overcurrent condition. Toggling EN2 or
removing load will reset the circuit breaker latch, and deassert FAULT2.

MIC2010/2070

Micrel

MIC2010/2070

November 29, 2001

Absolute Maximum Ratings

(Note 1, Note 4)

Supply Voltage (V

) ........................................ 0.3V to 6V

FAULT#, OUT1, OUT2 Output Pins ................. 0.3V to 6V

FAULT1,FAULT2, Output Current .............................. 25mA

ESD Rating, Note 3 ...................................................... 2kV

Operating Ratings

(Note 2)

Supply Voltage (V

MAIN,

AUX

) ..................... +4.5V to +5.5V

Continuous Output Current (AUX Mode) .. 50mA to 300mA

Ambient Temperature (T

) ........................... 0

C to +70

Junction Temperature (T

) ....................... Internally Limited

Package Thermal Resistance

QSOP

(

) ........................................................ 163

C/W

Electrical Characteristics

MAIN

= 5V; AUX = 5V; R

SET

= 125

, T

= 25

Symbol

Parameter

Condition

Min

Typ

Max

Units

MAIN

MAIN Supply Voltage

4.5

5.0

5.5

MAIN

MAIN Supply Current

S3# = 1, both switches ON, no load

Note 5

S3# = 1, both switches OFF, no load

LEAK

MAIN Reverse Leakage Current,

S3# = 0, both switches ON, V

MAIN

= 0V

+10

Note 5

AUX

AUX Supply Voltage

4.5

5.0

5.5

AUX

AUX Supply Current, Note 5

S3# = 0; No load, both switches ON

S3# = 0; No load, both switches OFF

UV/AUX

AUX Undervoltage Lockout

AUX

increasing

3.5

3.7

4.0

Threshold

AUX

decreasing

3.3

3.5

3.8

HYS

AUX Undervoltage Lockout

200

Hysteresis

DSMAIN

MAIN On-Resistance, Each Output

S3# = 1, I

OUT

= 500mA

100

140

DSAUX

AUX On-Resistance, Each Output

S3# = 0, I

OUT

= 100mA

500

700

LIMIT

MAIN Current-Limit Threshold,

S3# = 1, V

OUT

= 4.0V, ramped load

0.5

1.25

MAIN Short-Circuit Current-Limit

OUT

= 0V

0.5

1.25

Current-Limit Factor (AUX Supply),

S3# = 0, I

OUT

= 50mA to 300mA

14.4

21.6

A ·

Note 6

OUT

= 4V

S3#, EN1, EN2

High-to-Low transition

1.5

Input Threshold Voltage

Low-to-High transition

1.7

2.0

S3#, EN1, EN2 Input Current

S3/EN

=5V, 0V

HYS

EN1, EN2 and S3# Input Hysteresis

200

OFF

OUT1, 2 Leakage Current

Outputs are off, V

OUT

= 0

Pull-Up Current During Latched

Outputs latched off

TBD

Output State (MIC2070-x only)

TH LATCH

Latch Reset Threshold

OUT

rising

1.95

Minimum Output Slew Rate

Output rising

V/s

to Reset Latch (MIC2070-x only),
Note 7

Overtemperature Threshold

increasing, single channel

140

decreasing, single channel

120

increasing, both channels

160

decreasing, both channels

125

FAULT1, 2 Output Low Voltage

FAULT

= 5mA

0.2

FAULT1, 2 Output Off Current

FAULT

= 5V

0.2

(Not Applicable for 'P' versions)

November 29, 2001

MIC2010/2070

Micrel

Symbol

Parameter

Condition

Min

Typ

Max

Units

FAULT1, 2 Output High Voltage

FAULT

= 20

(MIC2010-1P, 2P), (MIC2070-1P, 2P)

MAIN to S3# Hold Time, Note 7

Figure 5

MAIN to S3# Set-up Time, Note 7

Figure 5

DLY

FAULT Delay Filter Response Time

Output shorted to ground, Figure 4

(Overcurrent only), Note 8

Overcurrent Response Time

Output shorted to ground, Figure 4
MAIN output

AUX output

ON(MAIN)

MAIN Output Turn-On Time

= 10

, C

= 1

F, Figure 3

OFF(MAIN)

MAIN Output Turn-Off Time

= 10

, C

= 1

F, Figure 3

r(MAIN)

MAIN Output Rise Time

= 10

, C

= 1

F, Figure 3

f(MAIN)

MAIN Output Fall Time

= 10

, C

= 1

F, Figure 3

ON(AUX)

AUX Output Turn-On Time

= 50

, C

= 1

F, Figure 3

0.6

OFF(AUX)

AUX Output Turn-Off Time

= 50

, C

= 1

F, Figure 3

120

r(AUX)

AUX Output Rise Time

= 50

, C

= 1

F, Figure 3

0.5

f(AUX)

AUX Output Fall Time

= 50

, C

= 1

F, Figure 3

115

XMA

MAIN to AUX

S3# transition to 0

7.5

Cross Conduction Time, Note 9

XAM

AUX to MAIN

S3# transition to 1

7.5

Cross Conduction Time, Note 9

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.

Note 4.

All voltages are referenced to ground.

Note 5.

For MIC2070-1(P) OFF occurs when V

< 0.8V and ON occurs when V

> 2.4V. For MIC2070-2(P) OFF occurs when V

> 2.4V and ON

occurs when V

< 0.8V.

Note 6.

Current-limit threshold is defined by the current-limit factor divided by R

SET

Note 7.

Guaranteed by design. Not production tested.

Note 8.

Assumes only one channel in current-limit. Delay circuitry is shared among channels so it is possible for t

DLY

to be 40ms max if one channel

enters current-limit as the other is about to time-out.

Note 9.

Cross conduction time is the duration in which both MAIN and AUX internal switches are on subsequent to S3# transitioning.

Test Circuit

Device
Under
Test

OUT

Timing Diagram

90%

OUT

10%

90%

10%

November 29, 2001

MIC2010/2070

Micrel

Functional Description

The MIC2010/2070 are designed to support the power distri-
bution requirements for USB wakeup from the ACPI S3 state.
It integrates two independent channels under control of input
S3#. When S3# is asserted LOW (ACPI S3 state) the MIC2010/
2070 will switch a 500m

MOSFET switch from the AUX

input to each of its two outputs. In addition the current-limit
threshold will be set to a value specified by a resistor
connected to the RSET inputs. Conversely when the S3#
input is HIGH the MIC2010/2070 will switch a 100m

MOSFET

switch from the MAIN inputs to each of its two outputs. The
current-limit threshold is preset to 500mA in this state. The
lower current limit during the ACPI S3 state helps to ensure
that the standby supply maintains regulation even during fault
conditions.

Thermal Shutdown

Thermal shutdown is employed to protect the device from
damage should the die temperature exceed safe margins
due mainly to short circuit faults. Thermal shutdown shuts off
the output MOSFET and asserts the FAULT output if the die
temperature reaches 140

C and the overheated channel is in

current limit. The other channel is not affected. If however, the
die temperature exceeds 160

C, both channels will be shut

off even if neither channel is in current limit.

Power Dissipation

The device's junction temperature depends on several fac-
tors such as the load, PCB layout, ambient temperature and
package type. The power dissipated in each channel is

= R

DS(on)

OUT

where R

DS(on)

is the on-resistance of the

internal MOSFETs and I

OUT

is the continuous output current.

Total power dissipation of the device will be the summation of
P

for both channels. To relate this to junction temperature,

the following equation can be used:

Functional Diagram

Current

Limit

10ms

Timer

Charge Pump

Gate Control

S3#

Current

Limit

MAIN

OUT

AUX

RSET

/FAULT

AUX

Latch

To Other Channel

MAIN
FET

AUX
FET

*MIC2070-1/2 Only

Thermal

Sense

* 'P' options only

TJ = P

+ T

where:

= junction temperature

= ambient temperature

= is the thermal resistance of the package

Current Sensing and Limiting

The current-limit threshold of each channel is preset inter-
nally at 500mA when S3# is deasserted. When S3# is
asserted the current-limit threshold is specified by a resistor
connected to the RSET input. The value of the current-limit
threshold is determined by the equation 18/R

SET

ohms where

SET

is the resistance connected between the RSET pin and

ground. The current-limit threshold should be set at 1.2X of
the applications continous output current requirement.

When an overcurrent condition lasts longer than t

DLY

the

MIC2070 will activate an internal circuit breaker that will latch
the output off and assert FAULT. The output will remain off
until either the load is removed or EN is toggled. When the
MIC2070 enters a latched output condition a 1mA pull-up
current source is activated. This provides a way to automati-
cally reset the output once the load is removed without the
need to toggle the enable input. Please refer to Figure 7 for
timing details.

The MIC2010 will automatically reset its output when the die
temperature cools down to 120

C. The MIC2010 output and

FAULT signal will continue to cycle on and off until the device
is disabled or the fault is removed. Figure 6 depicts typical
timing. Depending on PCB layout, package, ambient tem-
perature, etc., it may take several hundred milliseconds from
the incidence of the fault to the output MOSFET being shut

MIC2010/2070

Micrel

MIC2010/2070

November 29, 2001

off. This time duration will be shortest in the case of a dead
short on the output.

Fault Status Output

The FAULT signal is an active-low output with a weak pull-
up or open-drain configuration. FAULT is asserted when
either an overcurrent or thermal shutdown condition occurs.
In the case of an overcurrent condition, FAULT will be
asserted only after the flag response delay time, t

DLY

, has

elapsed. This ensures that FAULT is asserted only upon valid
overcurrent conditions and that erroneous error reporting is
eliminated. The FAULT response delay time t

DLY

is typically

10ms. Since the delay timer is shared between both channels
it is possible for t

DLY

to be extended by an amount equal to the

difference between the occurrence of the over-current event
in both channels.

Undervoltage Lockout

Undervoltage lockout (UVLO) prevents the output MOSFET
from turning on until the AUX input exceeds approximately
3.5V. UVLO ensures that the output MOSFETs remain off to
prevent high transient inrush current due to stray or bulk load
capacitance. This helps to ensure that the power supply
voltage regulation is preserved and also prevents possible
damage to sensitive components.

(MIC2010-2)

OUT

Overcurrent Fault

Thermal Shutdown

Reached

FAULT

Figure 6. MIC2010 System Timing

(MIC2070-2)

OUT

Overcurrent Fault

Load Removed

Output Reset

FAULT

Figure 7. MIC2070 System Timing--

Output Resets When Load is Removed

November 29, 2001

MIC2010/2070

Micrel

Functional Characteristics

MAIN

= V

AUX

= 5V

= 100

= 10

AUX Start-up by UVLO

TIME (500

s/div)

(2V/div)

L
T

(2V/div)

OUT

(2V/div)

OUT

(50mA/div)

AUX

ramps from 0V to 5V

MAIN

= S3# = 0V

EN = [ON]
R

LOAD

= 50

LOAD

= 1

MAIN

= V

AUX

= 5V

= 100

= 10

AUX Shutdown by UVLO

TIME (10ms/div)

2.96V

AUX

ramps from 5V to 0V

MAIN

= S3# = 0V

EN = [ON]
R

LOAD

= 50

LOAD

= 1

(2V/div)

L
T

(2V/div)

OUT

(2V/div)

OUT

(50mA/div)

Main Start-up by UVLO

TIME (500

s/div)

3.20V

MAIN

(2V/div)

L
T

(2V/div)

OUT

(2V/div)

OUT

(200mA/div)

MAIN

AUX

MAIN

AUX

ramp from 0V to 5V

S3# = 5V
EN = [ON]
R

LOAD

= 10

LOAD

= 1

S3# = 5V
EN = [ON]
R

LOAD

= 10

LOAD

= 1 F

MAIN

AUX

MAIN

AUX

ramp from 5V to 0V

MAIN

(2V/div)

AUL

(2V/div)

OUT

(2V/div)

OUT

(200mA/div)

Main Shut-down by UVLO

TIME (10ms/div)

2.96V

Main Turn-On Response

TIME (250

s/div)

MAIN

AUX

=5V

S3# = 5V

EN toggles from [OFF] to [ON]

LOAD

= 10

LOAD

= 1

(5V/div)

L
T

(5V/div)

OUT

(2V/div)

OUT

(200mA/div)

Main Turn-Off Response

TIME (100

s/div)

MAIN

AUX

=5V

S3# = 5V

EN toggles from [ON] to [OFF]

LOAD

= 10

LOAD

= 1

(5V/div)

L
T

(5V/div)

OUT

(5V/div)

OUT

(200mA/div)

MIC2010/2070

Micrel

MIC2010/2070

November 29, 2001

AUX Turn-On Response

TIME (100

s/div)

AUX

=5V

MAIN

S3# = 0V

EN toggles from [OFF] to [ON]

LOAD

= 50

LOAD

= 1

(5V/div)

L
T

(5V/div)

OUT

(5V/div)

OUT

(50mA/div)

AUX Turn-Off Response

TIME (100

s/div)

AUX

=5V

MAIN

S3# = 0V

EN toggles from [ON] to [OFF]

LOAD

= 50

LOAD

= 1

(5V/div)

L
T

(5V/div)

OUT

(5V/div)

OUT

(50mA/div)

Turn-On from S3# to AUX

TIME (100

s/div)

AUX

=5V, V

MAIN

= 0V

EN =

[ON]

S3# toggles from [HI] to [LOW]

LOAD

= 50

LOAD

= 1

S3#

(5V/div)

L
T

(5V/div)

OUT

(5V/div)

OUT

(50mA/div)

Turn-Off from AUX to S3#

TIME (1ms/div)

AUX

=5V, V

MAIN

S3# toggles from [LO] to [HI]
EN = [ON]
R

LOAD

= 50

LOAD

= 1

S3#

(5V/div)

L
T

(5V/div)

OUT

(2V/div)

OUT

(50mA/div)

Main Inrush Current into C

LOAD

TIME (500

s/div)

= 560

= 100

= 10

MAIN

AUX

= 5V

S3# = 5V

EN toggles from [OFF] to [ON]

LOAD

= OPEN

LOAD

= 10

F, 100

F, 560

(5V/div)

L
T

(5V/div)

OUT

(5V/div)

OUT

(500mA/div)

Main-Ramped to Short by MOSFET

1.4A

TIME (50ms/div)

MAIN

= V

AUX

=5V

S3# = 5V, EN = [ON]
C

LOAD

= 1

L
T

(5V/div)

OUT

(2V/div)

OUT

(500mA/div)

LOAD

toggles from > 1k

to <0.5

November 29, 2001

MIC2010/2070

Micrel

AUX Ramped to Short by MOSFET

TIME (25ms/div)

AUX

= 5V

MAIN

= S3# = 0V, EN = [ON]

OAD

toggles from >1k

to <0.5

LOAD

= 1

L
T

(5V/div)

OUT

(2V/div)

OUT

(100mA/div)

Main Turn-On into Short

TIME (2.5ms/div)

1.2A

MAIN

= V

AUX

=5V

S3# = 5V

EN toggles from [OFF] to [ON]

LOAD

= Short

LOAD

= 1

(5V/div)

L
T

(5V/div)

OUT

(5V/div)

(500mA/div)

AUX Turn-On into Short

TIME (2.5ms/div)

AUX

=5V

MAIN

= S3# = 0V

EN toggles from [OFF] to [ON]

LOAD

= 100

(5V/div)

L
T

(5V/div)

OUT

(2V/div)

OUT

(100mA/div)

AUX Inrush Current into Large C

LOAD

TIME (2.5ms/div)

230mA

AUX

=5V

MAIN

= S3#= 0V

EN toggles from [OFF] to [ON]

LOAD

< 10mA

LOAD

= 220

(5V/div)

L
T

(10V/div)

OUT

(5V/div)

(50mA/div)

AUX Inrush Current into Small C

LOAD

TIME (100

s/div)

AUX

=5V

MAIN

= S3# = 0V

EN toggles from [OFF] to [ON]

LOAD

< 10mA

LOAD

= 10

(5V/div)

L
T

(10V/div)

OUT

(5V/div)

(50mA/div)

Main-to-AUX Cross Conduction

TIME (250

s/div)

950

MAIN

= V

AUX

= 5V

S3# toggles from [HI] to [LO]
EN = [ON]
R

LOAD

= 50

LOAD

= 1

S3#

(5V/div)

(50mA/div)

OUT

(5V/div)

MAIN

(50mA/div)

November 29, 2001

MIC2010/2070

Micrel

MICREL INC.

1849 FORTUNE DRIVE

SAN JOSE, CA 95131

USA

TEL

+ 1 (408) 944-0800

FAX

+ 1 (408) 944-0970

WEB

http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

Package Information

0.2284 (5.801)
0.2240 (5.690)

SEATING

PLANE

0.009 (0.2286)

REF

0.012 (0.30)
0.008 (0.20)

0.157 (3.99)
0.150 (3.81)

0.050 (1.27)
0.016 (0.40)

0.0688 (1.748)
0.0532 (1.351)

0.196 (4.98)
0.189 (4.80)

0.025 (0.635)

BSC

PIN 1

DIMENSIONS:

INCHES (MM)

0.0098 (0.249)
0.0040 (0.102)

0.0098 (0.249)
0.0075 (0.190)

16-Pin QSOP (QS)

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MIC2070

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MIC2070