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MIC2010
Micrel
MIC2010/MIC2070
USB Power Controller Advance 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 supplies. 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 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 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 reduces power consumption during fault conditions.
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
ATX Power Supply 5V MAIN 5V STANDBY MIC2010-1P/-2P MAIN AUX ON/OFF 1 ON/OFF 2 S3# CONTROL 82801AA or Equivalent EN1 EN2 S3# RSET1 100F FAULT1 FAULT1 RSET2 GND OUT1 OUT2 VBUS D+ D- GND Downstream USB Port 2 100F VBUS D+ D- GND Downstream USB Port 1
SLP S3# SLP S5# OC0 OC1 Overcurrent Port 1 Overcurrent Port 1
Figure 1. USB Wakeup From ACPI S3 System Diagram
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
September 2000
1
MIC2010/2070
MIC2010
Micrel
Ordering Information
Part Number MIC2010-1CQS* MIC2010-1PCQS* MIC2010-2CQS* MIC2010-2PCQS MIC2070-1CQS MIC2070-1PCQS* MIC2070-2CQS* MIC2070-2PCQS*
* Contact factory for availability.
Enable Active High Active High Active Low Active Low Active High Active High Active Low Active Low
Fault Output Open-Drain Internal Pull-Up Open-Drain Internal Pull-Up Open-Drain Internal Pull-Up Open-Drain Internal Pull-Up
Circuit Breaker Function
Temperature Range 0C to +70C 0C to +70C 0C to +70C 0C to +70C
Package 16-lead QSOP 16-lead QSOP 16-lead QSOP 16-lead QSOP 16-lead QSOP 16-lead QSOP 16-lead QSOP 16-lead QSOP

0C to +70C 0C to +70C 0C to +70C 0C to +70C
Pin Configuration
FAULT1 1 EN1 2 S3# 3 RSET1 4 AUX 5 NC 6 RSET2 7 GND 8 16 FAULT2 15 EN2 14 OUT1 13 OUT1 12 MAIN 11 MAIN 10 OUT2 9 OUT2
16-Pin QSOP (QS)
MIC2010
2
September 2000
MIC2010
Micrel
Pin Description
Pin Number 1 Pin Name FAULT1 Pin Function Fault Status (Output): Channel 1, active-low; weak pull-up to AUX or opendrain. 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. Enable (Input): Channel 1, active-high (-1) or active-low (-2). Toggling this input also resets the latched output of the MIC2070. 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. 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. Auxiliary 5V Supply (Input): Also used as power supply for internal circuitry. No Connection: This pin may be connected to other pins without restriction. 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. Ground Channel 2 (Output): Both pins must be connected together externally. 5V Main Supply (Input): All MAIN inputs must be connected together externally. Channel 1 (Output): Both pins must be connected together externally. Enable (Input): Channel 2, active-high (-1) or active-low (-2). Toggling this input also resets the latched output for the MIC2070. Fault Status (Output): Channel 2, active-low; weak pull-up to AUX or opendrain. 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.
2 3
EN1 S3#
4
RSET1
5 6 7
AUX NC RSET2
8 9, 10 11, 12 13, 14 15 16
GND OUT2 MAIN OUT1 EN2 FAULT2
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MIC2010/2070
MIC2010
Micrel
Absolute Maximum Ratings (Note 1, Note 4)
Supply Voltage (VIN) ........................................ -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 (VMAIN, VAUX) ..................... +4.5V to +5.5V Continuous Output Current (AUX Mode) .. 50mA to 300mA Ambient Temperature (TA) ........................... -0C to +70C Junction Temperature (TJ) ....................... Internally Limited Package Thermal Resistance QSOP(JA) ........................................................ 163C/W
Electrical Characteristics
VMAIN = 5V; AUX = 5V; RSET = 125, TA = 25C. Symbol VMAIN IMAIN ILEAK VAUX IAUX VUV/AUX VHYS RDSMAIN RDSAUX ILIMIT Parameter MAIN Supply Voltage MAIN Supply Current Note 5 MAIN Reverse Leakage Current, Note 5 AUX Supply Voltage AUX Supply Current, Note 5 AUX Undervoltage Lockout Threshold AUX Undervoltage Lockout Hysteresis MAIN On-Resistance, Each Output AUX On-Resistance, Each Output MAIN Current-Limit Threshold, MAIN Short-Circuit Current-Limit Current-Limit Factor (AUX Supply), Note 6 VTH IIN VHYS IOFF S3#, EN1, EN2 Input Threshold Voltage S3#, EN1, EN2 Input Current EN1, EN2 and S3# Input Hysteresis OUT1, 2 Leakage Current Pull-Up Current During Latched Output State (MIC2070-x only) VTH LATCH Latch Reset Threshold Minimum Output Slew Rate to Reset Latch (MIC2070-x only), Note 7 Overtemperature Threshold Outputs are off, VOUT = 0 Outputs latched off VOUT rising Output rising -10 TBD 1 1.95 .4 S3# = 1, IOUT = 500mA S3# = 0, IOUT = 100mA S3# = 1, VOUT = 4.0V, ramped load VOUT = 0V S3# = 0, IOUT = 50mA to 300mA VOUT = 4V High-to-Low transition Low-to-High transition VS3/EN =5V, 0V 0.5 0.5 14.4 .8 -1 200 10 TBD 18 1.5 1.7 S3# = 0; No load, both switches ON S3# = 0; No load, both switches OFF VAUX increasing VAUX decreasing 3.5 3.3 S3# = 1, both switches ON, no load S3# = 1, both switches OFF, no load S3# = 0, both switches ON, VMAIN = 0V -10 4.5 5.0 .6 3.7 3.5 200 100 500 140 700 1.25 1.25 21.6 Condition Min 4.5 Typ 5.0 16 Max 5.5 22 5 +10 5.5 1 5 4.0 3.8 Units V A A A V mA A V V mV m m A A A* V V A mV A mA V V/s
2.0 1
TJ increasing, single channel TJ decreasing, single channel TJ increasing, both channels TJ decreasing, both channels IFAULT = 5mA VFAULT = 5V
140 120 160 150 0.2 0.2 10
C C C C V A
VOL
FAULT1, 2 Output Low Voltage FAULT1, 2 Output Off Current (Not Applicable for 'P' versions)
MIC2010
4
September 2000
MIC2010
Symbol VOH TH TS tDLY tOC Parameter FAULT1, 2 Output High Voltage (MIC2010-1P, 2P), (MIC2070-1P, 2P) MAIN to S3# Hold Time, Note 7 MAIN to S3# Set-up Time, Note 7 FAULT Delay Filter Response Time (Overcurrent only), Note 8 Overcurrent Response Time Condition IFAULT = -20A Figure 5 Figure 5 Output shorted to ground, Figure 4 Output shorted to ground, Figure 4 MAIN output AUX output RL = 10, CL = 1F, Figure 3 RL = 10, CL = 1F, Figure 3 RL = 10, CL = 1F, Figure 3 RL = 10, CL = 1F, Figure 3 RL = 50, CL = 1F, Figure 3 RL = 50, CL = 1F, Figure 3 RL = 50, CL = 1F, Figure 3 RL = 50, CL = 1F, Figure 3 S3# transition to 0 S3# transition to 1 Min 4 5 0 5 10 20 Typ Max
Micrel
Units V ms ms ms
2 2 2 35 2 32 0.6 120 0.5 115 5 5 7.5 7.5
s s ms s ms s ms s ms s ms ms
tON(MAIN) tOFF(MAIN) tr(MAIN) tf(MAIN) tON(AUX) tOFF(AUX) tr(AUX) tf(AUX) tXMA tXAM
Note 1. Note 2. Note 3. Note 4. Note 5. Note 6. Note 7. Note 8. Note 9.
MAIN Output Turn-On Time MAIN Output Turn-Off Time MAIN Output Rise Time MAIN Output Fall Time AUX Output Turn-On Time AUX Output Turn-Off Time AUX Output Rise Time AUX Output Fall Time MAIN to AUX Cross Conduction Time, Note 9 AUX to MAIN Cross Conduction Time, Note 9
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. All voltages are referenced to ground. For MIC2070-1(P) OFF occurs when VEN < 0.8V and ON occurs when VEN > 2.4V. For MIC2070-2(P) OFF occurs when VEN > 2.4V and ON occurs when VEN < 0.8V. Current-limit threshold is defined by the current-limit factor divided by RSET. Guaranteed by design. Not production tested. Assumes only one channel in current-limit. Delay circuitry is shared among channels so it is possible for tDLY to be 40ms max if one channel enters current-limit as the other is about to time-out. Cross conduction time is the duration in which both MAIN and AUX internal switches are on subsequent to S3# transitioning.
Test Circuit
VOUT Device Under OUT Test IOUT RL CL
Timing Diagram
tr VOUT 10% 90% 90% 10% tf
September 2000
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MIC2010/2070
MIC2010
Micrel
VEN
50% tOFF tON
VOUT
90% 10%
Figure 2. MIC2010/70-1
VEN
50% tOFF tON
VOUT
90% 10%
Figure 3. MIC2010/70-2
Output shorted to ground
VOUT IOUT FAULT# ILIMIT tOC tDLY
Figure 4. Overcurrent Response Timing
tH MAIN S3# 1.5V
tS
1.5V
Figure 5. MAIN to S3# Timing
MIC2010/2070
6
September 2000
MIC2010
Micrel
Functional Diagram
MAIN Current Limit
MAIN FET
EN
Charge Pump + Gate Control
AUX FET
OUT
S3# Current Limit
AUX
Thermal Sense
RSET
AUX * 'P' options only Latch 10ms Timer * /FAULT *MIC2070-1/2 Only To Other Channel
Functional Description
The MIC2010/2070 are designed to support the power distribution 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 140C and the overheated channel is in current limit. The other channel is not affected. If however, the die temperature exceeds 160C, both channels will be shut off even if neither channel is in current limit. Power Dissipation The device's junction temperature depends on several factors such as the load, PCB layout, ambient temperature and package type. The power dissipated in each channel is PD = RDS(on) x IOUT2 where RDS(on) is the on-resistance of the internal MOSFETs and IOUT is the continuous output current. Total power dissipation of the device will be the summation of PD for both channels. To relate this to junction temperature, the following equation can be used: September 2000 7
TJ = PD x JA + TA where: TJ = junction temperature TA = ambient temperature JA = is the thermal resistance of the package
Current Sensing and Limiting The current-limit threshold of each channel is preset internally 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/RSET ohms where RSET 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 tDLY 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 automatically 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 120C. 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 temperature, etc., it may take several hundred milliseconds from the incidence of the fault to the output MOSFET being shut
MIC2010/2070
MIC2010
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 pullup 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, tDLY , 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 tDLY is typically 10ms. Since the delay timer is shared between both channels it is possible for tDLY to be extended by an amount equal to the
Micrel
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.
EN (MIC2010-2) VOUT FAULT
Overcurrent Fault
Thermal Shutdown Reached
Figure 6. MIC2010 System Timing
EN (MIC2070-2) VOUT FAULT
Overcurrent Fault
Load Removed- Output Reset
Figure 7. MIC2070 System Timing-- Output Resets When Load is Removed
MIC2010/2070
8
September 2000
MIC2010
Micrel
Package Information
PIN 1
0.157 (3.99) 0.150 (3.81)
DIMENSIONS: INCHES (MM)
0.009 (0.2286) REF 0.025 (0.635) BSC 0.0098 (0.249) 0.0040 (0.102)
0.012 (0.30) 0.008 (0.20)
0.0098 (0.249) 0.0075 (0.190)
45
8 0
SEATING 0.0688 (1.748) PLANE 0.0532 (1.351)
0.196 (4.98) 0.189 (4.80)
0.050 (1.27) 0.016 (0.40) 0.2284 (5.801) 0.2240 (5.690)
16-Pin QSOP (QS)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 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. (c) 2000 Micrel Incorporated
September 2000
9
MIC2010/2070

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