MIC2010 MICREL | Alldatasheet

Document overview

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Technical content

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

S3# RSET1 AUX NC RSET2 GND

16 FAULT2

16-Pin QSOP (QS)

Ordering Information

Fault Circuit Breaker Temperature Part Number Enable Output Function Range Package MIC2010-1CQS* Active High Open-Drain 0 °C to +70°C 16-lead QSOP MIC2010-1PCQS* Active High Internal Pull-Up 0 °C to +70°C 16-lead QSOP MIC2010-2CQS* Active Low Open-Drain 0 °C to +70°C 16-lead QSOP MIC2010-2PCQS Active Low Internal Pull-Up 0 °C to +70°C 16-lead QSOP MIC2070-1CQS Active High Open-Drain 0°C to +70°C 16-lead QSOP MIC2070-1PCQS* Active High Internal Pull-Up 0°C to +70°C 16-lead QSOP MIC2070-2CQS* Active Low Open-Drain 0°C to +70°C 16-lead QSOP MIC2070-2PCQS* Active Low Internal Pull-Up 0°C to +70°C 16-lead QSOP * Contact factory for availability.

September 2000 3 MIC2010/2070 MIC2010 Micrel Pin Description Pin Number Pin Name Pin Function

1 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. 2 EN1 Enable (Input): Channel 1, active-high ( –1) or active-low (–2). Toggling this input also resets the latched output of the MIC2070.

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

OUT1 and OUT2 via 100mΩ , 500mA MOSFET switches. When this input is LOW, the AUX inputs are connected to OUT1 and OUT2 via 500mΩ MOSFET switches with a current-limit threshold specified by external resistors, RSET1 and RSET2. 4 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. 5 AUX Auxiliary 5V Supply (Input): Also used as power supply for internal circuitry. 6 NC No Connection: This pin may be connected to other pins without restriction. 7 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.

8 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. 15 EN2 Enable (Input): Channel 2, active-high ( –1) or active-low (–2). Toggling this input also resets the latched output for the MIC2070.

16 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.

Absolute Maximum Ratings (Note 1, Note 4) Operating Ratings (Note 2) Continuous Output Current (AUX Mode) .. 50mA to 300mA Ambient Temperature (T Package Thermal Resistance

Electrical Characteristics

VMAIN = 5V; AUX = 5V; RSET = 125Ω , TA = 25°C. Symbol Parameter Condition Min Typ Max Units VMAIN MAIN Supply Voltage 4.5 5.0 5.5 V IMAIN MAIN Supply Current S3# = 1, both switches ON, no load 16 22 µA Note 5 S3# = 1, both switches OFF, no load 5 µA ILEAK MAIN Reverse Leakage Current, S3# = 0, both switches ON, VMAIN = 0V –10 +10 µA Note 5 VAUX AUX Supply Voltage 4.5 5.0 5.5 V IAUX AUX Supply Current, Note 5 S3# = 0; No load, both switches ON .6 1 mA S3# = 0; No load, both switches OFF 5 µA VUV/AUX AUX Undervoltage Lockout V AUX increasing 3.5 3.7 4.0 V Threshold V AUX decreasing 3.3 3.5 3.8 V VHYS AUX Undervoltage Lockout 200 mV Hysteresis R DSMAIN MAIN On-Resistance, Each Output S3# = 1, IOUT = 500mA 100 140 m Ω R DSAUX AUX On-Resistance, Each Output S3# = 0, IOUT = 100mA 500 700 m Ω ILIMIT MAIN Current-Limit Threshold, S3# = 1, VOUT = 4.0V, ramped load 0.5 1.25 A MAIN Short-Circuit Current-Limit VOUT = 0V 0.5 1.25 A Current-Limit Factor (AUX Supply), S3# = 0, IOUT = 50mA to 300mA 14.4 18 21.6 A •Ω Note 6 VOUT = 4V VTH S3#, EN1, EN2 High-to-Low transition .8 1.5 V Input Threshold Voltage Low-to-High transition 1.7 2.0 V IIN S3#, EN1, EN2 Input Current V S3/EN =5V, 0V –11 µA VHYS EN1, EN2 and S3# Input Hysteresis 200 mV IOFF OUT1, 2 Leakage Current Outputs are off, V OUT = 0 –10 10 µA Pull-Up Current During Latched Outputs latched off TBD 1 TBD mA Output State (MIC2070-x only) VTH LATCH Latch Reset Threshold V OUT rising 1.95 V Minimum Output Slew Rate Output rising .4 V/s to Reset Latch (MIC2070-x only), Note 7 Overtemperature Threshold T J increasing, single channel 140 °C TJ decreasing, single channel 120 °C TJ increasing, both channels 160 °C TJ decreasing, both channels 150 °C VOL FAULT1, 2 Output Low Voltage I FAULT = 5mA 0.2 V FAULT1, 2 Output Off Current V FAULT = 5V 0.2 10 µA (Not Applicable for 'P' versions)

September 2000 5 MIC2010/2070 MIC2010 Micrel Symbol Parameter Condition Min Typ Max Units VOH FAULT1, 2 Output High Voltage I FAULT = –20µA4 V (MIC2010-1P, 2P), (MIC2070-1P, 2P) TH MAIN to S3# Hold Time, Note 7 Figure 5 5 ms TS MAIN to S3# Set-up Time, Note 7 Figure 5 0 ms tDLY FAULT Delay Filter Response Time Output shorted to ground, Figure 4 5 10 20 ms (Overcurrent only), Note 8 tOC Overcurrent Response Time Output shorted to ground, Figure 4 MAIN output 2 µs AUX output 2 µs tON(MAIN) MAIN Output Turn-On Time R L = 10Ω , CL = 1µF, Figure 3 2 ms tOFF(MAIN) MAIN Output Turn-Off Time R L = 10Ω , CL = 1µF, Figure 3 35 µs tr(MAIN) MAIN Output Rise Time R L = 10Ω , CL = 1µF, Figure 3 2 ms tf(MAIN) MAIN Output Fall Time R L = 10Ω , CL = 1µF, Figure 3 32 µs tON(AUX) AUX Output Turn-On Time R L = 50Ω , CL = 1µF, Figure 3 0.6 ms tOFF(AUX) AUX Output Turn-Off Time R L = 50Ω , CL = 1µF, Figure 3 120 µs tr(AUX) AUX Output Rise Time R L = 50Ω , CL = 1µF, Figure 3 0.5 ms tf(AUX) AUX Output Fall Time R L = 50Ω , CL = 1µF, Figure 3 115 µs tXMA MAIN to AUX S3# transition to 0 5 7.5 ms Cross Conduction Time, Note 9 tXAM AUX to MAIN S3# transition to 1 5 7.5 ms 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 4. All voltages are referenced to ground. occurs when VEN < 0.8V. Note 6. Current-limit threshold is defined by the current-limit factor divided by RSET . 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 tDLY 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 C L OUT R L VOUT IOUT Timing Diagram 90%VOUT 10% 90% 10% tr tf

September 2000 7 MIC2010/2070 MIC2010 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 500mΩ 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 100mΩ 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 P D = RDS(on) × IOUT 2 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: Functional Diagram Current Limit 10ms Timer Charge Pump Gate Control S3# EN 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 = PD × θJA + TA where: TJ = junction temperature TA = ambient temperature θJA = 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 R 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

September 2000 9 MIC2010/2070 MIC2010 Micrel

Package Information

45° 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) 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. © 2000 Micrel Incorporated