MIC2026/2076 Micrel MIC2026/2076 Dual-Channel Power Distribution Switch General Description Features The MIC2026 and MIC2076 are high-side MOSFET switches optimized for general-purpose power distribution requiring circuit protection. The MIC2026/76 are internally current limited and have thermal shutdown that protects the device and load. The MIC2076 offers "smart" thermal shutdown that reduces current consumption in fault modes. When a thermal shutdown fault occurs, the output is latched off until the faulty load is removed. Removing the load or toggling the enable input will reset the device output. Both devices employ soft-start circuitry that minimizes inrush current in applications where highly capacitive loads are employed. A fault status output flag is asserted during overcurrent and thermal shutdown conditions. Transient faults are internally filtered. The MIC2026/76 are available in 8-pin DIP or 8-lead SOP. * * * * * * * * * * * * 140m maximum on-resistance per channel 2.7V to 5.5V operating range 500mA minimum continuous current per channel Short-circuit protection with thermal shutdown Thermally isolated channels Fault status flag with 3ms filter eliminates false assertions Undervoltage lockout Reverse current flow blocking (no "body diode") Circuit breaker mode (MIC2076) Logic-compatible inputs Soft-start circuit Low quiescent current Pin-compatible with MIC2526 Applications * * * * * * USB peripherals General purpose power switching ACPI power distribution Notebook PCs PDAs PC card hot swap Typical Application VCC 2.7V to 5.5V VCONT. 10k 10k Logic Controller VIN MIC2026-2 ON/OFF ENA OUTA OVERCURRENT FLGA IN OVERCURRENT FLGB GND ENB OUTB ON/OFF Load 0.1F Load Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com February 2001 1 MIC2026/2076 MIC2026/2076 Micrel Ordering Information Part Number Enable Temperature Range Package MIC2026-1BM Active High -40C to +85C 8-lead SOP MIC2026-2BM Active Low -40C to +85C 8-lead SOP MIC2026-1BN Active High -40C to +85C 8-pin DIP MIC2026-2BN Active Low -40C to +85C 8-pin DIP MIC2076-1BM Active High -40C to +85C 8-lead SOP MIC2076-2BM Active Low -40C to +85C 8-lead SOP MIC2076-1BN Active High -40C to +85C 8-pin DIP MIC2076-2BN Active Low -40C to +85C 8-pin DIP Pin Configuration MIC2026/76 ENA 1 8 OUTA FLGA 2 7 IN FLGB 3 6 GND ENB 4 5 OUTB 8-Lead SOP (BM) 8-Pin DIP (BN) Pin Description Pin Number Pin Name 1 ENA Switch A Enable (Input): Logic-compatible enable input. Active high (-1) or active low (-2). 2 FLGA Fault Flag A (Output): Active-low, open-drain output. Indicates overcurrent or thermal shutdown conditions. Overcurrent conditions must last longer than tD in order to assert FLGA. 3 FLGB Fault Flag B (Output): Active-low, open-drain output. Low indicates overcurrent or thermal shutdown conditions.Overcurrent conditions must last longer than tD in order to assert FLGB. 4 ENB Switch B Enable (Input): Logic-compatible enable input. Active-high (-1) or active-low (-2). 5 OUTB Switch B (Output) 6 GND Ground 7 IN 8 OUTA MIC2026/2076 Pin Function Input: Switch and logic supply input. Switch A (Output) 2 February 2001 MIC2026/2076 Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VIN) ...................................... -0.3V to +6V Fault Flag Voltage (VFLG) .............................................. +6V Fault Flag Current (IFLG) ............................................ 25mA Output Voltage (VOUT) .................................................. +6V Output Current (IOUT) ............................... Internally Limited Enable Input (IEN) .................................... -0.3V to VIN + 3V Storage Temperature (TS) ...................... -65C to +150 C ESD Rating, Note 3 Supply Voltage (VIN) ................................... +2.7V to +5.5V Ambient Temperature (TA) ......................... -40C to +85C Junction Temperature Range (TJ) ........... Internally Limited Thermal Resistance SOP (JA) .......................................................... 160C/W DIP(JA) ............................................................. 105C/W Electrical Characteristics VIN = +5V; TA = 25C, bold values indicate -40C TA +85C; unless noted Symbol Parameter Condition IDD Supply Current VEN Enable Input Threshold Min Typ Max Units MIC20x6-1, VENA = VENB 0.8V (switch off), OUT = open 0.75 5 A MIC20x6-2, VENA = VENB 2.4V (switch off), OUT = open 0.75 5 A MIC20x6-1, VENA = VENB 2.4V (switch on), OUT = open 100 160 A MIC20x6-2, VENA = VENB 0.8V (switch on), OUT = open 100 160 A low-to-high transition 1.7 2.4 V high-to-low transition 0.8 Enable Input Hysteresis IEN Enable Input Current VEN = 0V to 5.5V -1 Enable Input Capacitance RDS(on) Switch Resistance 1.45 V 250 mV 0.01 1 1 A pF VIN = 5V, IOUT = 500mA 90 140 m VIN = 3.3V, IOUT = 500mA 100 170 m 10 A Output Leakage Current MIC20x6-1, VENx 0.8V; MIC20x6-1, VENx 2.4V, (output off) OFF Current in Latched Thermal Shutdown MIC2076 (during thermal shutdown state) 50 tON Output Turn-On Delay RL = 10, CL = 1F, see "Timing Diagrams" 1.3 5 ms tR Output Turn-On Rise Time RL = 10, CL = 1F, see "Timing Diagrams" 1.15 4.9 ms tOFF Output Turnoff Delay RL = 10, CL = 1F, see "Timing Diagrams" 35 100 s tF Output Turnoff Fall Time RL = 10, CL = 1F, see "Timing Diagrams" 32 100 s ILIMIT Short-Circuit Output Current VOUT = 0V, enabled into short-circuit 0.9 1.25 A Current-Limit Threshold ramped load applied to output 1.0 1.25 A Short-Circuit Response Time VOUT = 0V to IOUT = ILIMIT (short applied to output) 20 Overcurrent Flag Response Delay VIN = 5V, apply VOUT = 0V until FLG low tD Undervoltage Lockout Threshold February 2001 0.5 1.5 VIN = 3.3V, apply VOUT = 0V until FLG low 3 A s 7 3 ms ms VIN rising 2.2 2.4 2.7 V VIN falling 2.0 2.15 2.5 V 3 MIC2026/2076 MIC2026/2076 Symbol Micrel Parameter Condition Error Flag Output Resistance Error Flag Off Current Min Typ Max Units IL = 10mA, VIN = 5V 10 25 IL = 10mA, VIN = 3.3V 15 40 10 A VFLAG = 5V Overtemperature Threshold Note 4 TJ increasing, each switch 140 C TJ decreasing, each switch 120 C TJ increasing, both switches 160 C TJ decreasing, both switches 150 C 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. Note 4. If there is a fault on one channel, that channel will shut down when the die reaches approximately 140C. If the die reaches approximately 160C, both channels will shut down, even if neither channel is in current limit. Test Circuit VOUT Device Under OUT Test RL CL Timing Diagrams tR tF 90% VOUT 90% 10% 10% Output Rise and Fall Times VEN 50% tOFF tON 90% VOUT 10% Active-Low Switch Delay Times (MIC20x6-2) VEN 50% tOFF tON VOUT 90% 10% Active-High Switch Delay Times (MIC20x6-1) MIC2026/2076 4 February 2001 MIC2026/2076 Micrel Supply On-Current vs. Temperature 140 5V 120 100 80 3.3V 60 40 20 5 3.3V 120 4 100 5V 80 60 IOUT = 500mA 40 RL=10 CL=1F 3 2 VIN = 3.3V 1 20 VIN = 5V 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) Supply On-Current vs. Input Voltage On-Resistance vs. Input Voltage Turn-On Rise Time vs. Input Voltage 200 -40C 100 +25C +85C 50 2.5 2.0 150 RISE TIME (ms) 150 RESISTANCE (m) 200 CURRENT (A) Turn-On Rise Time vs. Temperature RISE TIME (ms) 160 160 ON-RESISTANCE (m) 180 140 CURRENT (A) On-Resistance vs. Temperature +85C +25C 100 -40C 50 +85C 1.5 1.0 +25C -40C 0.5 RL=10 CL=1F IOUT = 500mA VIN = 3.3V 600 VIN = 5V 400 200 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) Short-Circuit Current-Limit vs. Input Voltage 800 CURRENT LIMIT (mA) 700 600 500 +85C +25C -40C 400 300 200 100 0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) February 2001 5.5 0 2.5 5.5 Current-Limit Threshold vs. Temperature 1200 1200 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 Fall Time vs. Temperature 400 VIN = 5V 1000 800 FALL TIME (s) CURRENT LIMIT (mA) 1000 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) VIN = 3.3V 600 400 300 VIN = 3.3V 200 RL=10 CL=1F 100 200 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) Current-Limit Threshold vs. Input Voltage Fall Time vs. Input Voltage 300 1000 800 250 +85C +25C RISE TIME (s) Short-Circuit Current-Limit vs. Temperature 800 0 2.5 5.5 CURRENT LIMIT THRESHOLD (mA) 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) CURRENT LIMIT THRESHOLD (mA) 0 2.5 -40C 600 400 200 0 2.5 200 150 100 50 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5 5.5 0 2.5 TA = 25C CL = 1F RL = 10 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 MIC2026/2076 MIC2026/2076 Micrel Enable Threshold vs. Temperature Flag Delay vs. Temperature 0.16 DELAY TIME (ms) VEN RISING 2.0 1.5 VEN FALLING 1.0 0.5 SUPPLY CURRENT (A) VIN = 3.3V 4 VIN = 5V 3 2 1 VIN = 5V 0.14 5V 0.12 0.1 0.08 0.06 3.3V 0.04 0.02 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) Enable Threshold vs. Input Voltage Flag Delay vs. Input Voltage Supply Off Current vs. Input Voltage 2.0 5 VEN RISING 1.5 VEN FALLING 1.0 0.5 4 3 0.18 +85C SUPPLY CURRENT (A) 2.5 ENABLE THRESHOLD (V) 5 DELAY TIME (ms) ENABLE THRESHOLD (V) 2.5 Supply Off Current vs. Temperature +25C -40C 2 1 TA = 25C 0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 0 2.5 5.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 0.16 0.14 +85C 0.12 0.10 0.08 0.06 0.04 +25C -40C 0.02 0 2.5 3.0 3.5 4.0 4.5 VOLTAGE (V) 5.0 5.5 UVLO Threshold vs. Temperature UVLO THRESHOLD (V) 3.0 2.5 V IN RISING 2.0 V IN FALLING 1.5 1.0 0.5 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) MIC2026/2076 6 February 2001 MIC2026/2076 Micrel Functional Characteristics UVLO--VIN Falling (MIC2026-1) VFLG VIN (2V/div.) (2V/div.) VIN VFLG (2V/div.) (2V/div.) UVLO--VIN Rising (MIC2026-1) TIME (100ms/div.) Turn-On/Turnoff (MIC2026-1) Turn-On (MIC2026-1) 712mA (Inrush Current) VIN = 5V CL = 147F RL = 35 IOUT (200mA/div.) VIN = 5V CL = 147F RL = 35 IOUT (200mA/div.) VEN = VIN CL = 57F RL = 35 TIME (10ms/div.) VOUT VFLG VEN (5V/div.) (5V/div.) (10V/div.) VEN VOUT VFLG (5V/div.) (5V/div.) (10V/div.) IOUT (100mA/div.) VEN = VIN CL = 57F RL = 35 140mA 140mA TIME (10ms/div.) TIME (500s/div.) Turnoff (MIC2026-1) Enabled Into Short (MIC2026-1) VEN VOUT VFLG (5V/div.) (5V/div.) (10V/div.) VEN VOUT VFLG (5V/div.) (5V/div.) (10V/div.) 2.2V VOUT IOUT (100mA/div.) (5V/div.) VOUT (2V/div.) 2.4V 3.1ms (tD) IOUT (500mA/div.) IOUT (200mA/div.) 700mA VIN = 5V CL = 147F RL = 35 140mA TIME (500s/div.) TIME (5ms/div.) February 2001 VIN = 5V 7 MIC2026/2076 MIC2026/2076 Micrel Current-Limit Response (Ramped Load-MIC2026-1) CL = 110F IOUT (200mA/div.) CL = 210F VOUT (5V/div.) VFLG VIN (10V/div.) (10V/div.) VEN VFLG (5V/div.) (10V/div.) Inrush Current Response (MIC2026-1) VIN = 5V RL = 31 IOUT (500mA/div.) CL = 310F CL = 10F Short Removed Thermal Shutdown Hysteresis Current-Limit Response (MIC2026-1) VEN VFLG (5V/div.) (10V/div.) Current-Limit Response (Stepped Short--MIC2026-1) VOUT (5V/div.) VIN = 5V CL = 47F RL = stepped short IOUT (5A/div.) VOUT (5V/div.) 800mA VIN = 5V CL = 0 RL = stepped short Short-Circuit (800mA) TIME (1ms/div.) TIME (50s/div.) Independent Thermal Shutdown (MIC2026-1) Independent Thermal Shutdown (MIC2026-1) VENA VFLGB VFLGA (5V/div.) (5V/div.) (10V/div.) IOUT (2A/div.) VFLGA VENB (5V/div.) (10V/div.) Short-Circuit Current (800mA) Thermal Shutdown TIME (100ms/div.) VOUTA = No Load (No Thermal Shutdown) IOUTA (500mA/div.) VFLGB (5V/div.) IOUTB (500mA/div.) Current-Limit Threshold (1A) TIME (1ms/div.) Thermal Shutdown TIME (100ms/div.) MIC2026/2076 VIN = 5V CL = 47F VOUTB = No Load (No Thermal Shutdown) Thermal Shutdown TIME (100ms/div.) 8 February 2001 MIC2026/2076 Micrel No Load Load Removed Enable Reset VFLG (5V/div.) VOUT VFLG (5V/div.) (10V/div.) RL = 0 IOUTB (500mV/div.) VOUT (5V/div.) VIN = 5V CL = 47F VENB = 0V Output Reset Ramp Load to Short CL = 57F RL = 35 IOUT (500mA/div.) Output Reset Thermal Shutdown Thermal Shutdown VIN = 5V TIME (2.5s/div.) TIME (100ms/div.) Thermal Shutdown (Output Reset by Removing Load--MIC2076-2) Independent Thermal Shutdown (MIC2076-2) Output Latched Off VFLGB VFLGA (5V/div.) (5V/div.) RL = 0 Load Removed (Output Reset) Ramp Load to Short Load Removed Output Reset Thermal Shutdown Thermal Shutdown VIN = 5V CL = 47F No Load No Thermal Shutdown on Channel B IOUTA (500mA/div.) IOUT (500mA/div.) VOUT (5V/div.) VEN VFLG (5V/div.) (10V/div.) Thermal Shutdown (Output Reset by Toggling Enable--MIC2076-2) VEN (10V/div.) Thermal Shutdown (MIC2076-2--Output Latched Off) TIME (100ms/div.) VIN = 5V CL = 47F VENB = 0V VENA = 0V TIME (2.5s/div.) Independent Thermal Shutdown (MIC2076-2) IOUTB (500mA/div.) VFLGA VFLGB (5V/div.) (10V/div.) RL = 0 Load Removed No Load Output Reset No Thermal Shutdown on Channel A Thermal Shutdown VIN = 5V CL = 47F VENB = 0V VENA = 0V TIME (2.5s/div.) February 2001 9 MIC2026/2076 MIC2026/2076 Micrel Block Diagram FLGA FLAG RESPONSE DELAY OUTA ENA CHARGE PUMP GATE CONTROL CURRENT LIMIT OSC. THERMAL SHUTDOWN UVLO 1.2V REFERENCE CHARGE PUMP GATE CONTROL IN CURRENT LIMIT ENB FLAG RESPONSE DELAY OUTB FLGB MIC2026/2076 GND The MIC2026 will automatically reset its output when the die temperature cools down to 120C. The MIC2026 output and FLG signal will continue to cycle on and off until the device is disabled or the fault is removed. Figure 2 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 off. This time will be shortest in the case of a dead short on the output. Power Dissipation The device's junction temperature depends on several factors such as the load, PCB layout, ambient temperature and package type. Equations that can be used to calculate power dissipation of each channel and junction temperature are found below. PD = RDS(on) x IOUT2 Functional Description Input and Output IN is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUT is the source of the output MOSFET. In a typical circuit, current flows from IN to OUT toward the load. If VOUT is greater than VIN, current will flow from OUT to IN, since the switch is bidirectional when enabled. The output MOSFET and driver circuitry are also designed to allow the MOSFET source to be externally forced to a higher voltage than the drain (VOUT > VIN) when the switch is disabled. In this situation, the MIC2026/76 prevents undesirable current flow from OUT to IN. 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. Each channel employs its own thermal sensor. Thermal shutdown shuts off the output MOSFET and asserts the FLG output if the die temperature reaches 140C and the overheated channel is in current limit. The other channel is not effected. If however, the die temperature exceeds 160C, both channels will be shut off. Upon determining a thermal shutdown condition, the MIC2076 will latch the output off. In this case, a pull-up current source is activated. This allows the output latch to automatically reset when the load (such as a USB device) is removed. The output can also be reset by toggling EN. Refer to Figure 1 for timing details. MIC2026/2076 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: TJ = PD x JA + TA where: TJ = junction temperature TA = ambient temperature JA = is the thermal resistance of the package 10 February 2001 MIC2026/2076 Micrel Current Sensing and Limiting The current-limit threshold is preset internally. The preset level prevents damage to the device and external load but still allows a minimum current of 500mA to be delivered to the load. The current-limit circuit senses a portion of the output MOSFET switch current. The current-sense resistor shown in the block diagram is virtual and has no voltage drop. The reaction to an overcurrent condition varies with three scenarios: Fault Flag The FLG signal is an N-channel open-drain MOSFET output. FLG is asserted (active-low) when either an overcurrent or thermal shutdown condition occurs. In the case of an overcurrent condition, FLG will be asserted only after the flag response delay time, tD, has elapsed. This ensures that FLG is asserted only upon valid overcurrent conditions and that erroneous error reporting is eliminated. For example, false overcurrent conditions can occur during hot-plug events when a highly capacitive load is connected and causes a high transient inrush current that exceeds the current-limit threshold for up to 1ms. The FLG response delay time tD is typically 3ms. Undervoltage Lockout Undervoltage lockout (UVLO) prevents the output MOSFET from turning on until VIN exceeds approximately 2.5V. Undervoltage detection functions only when the switch is enabled. Switch Enabled into Short-Circuit If a switch is enabled into a heavy load or short-circuit, the switch immediately enters into a constant-current mode, reducing the output voltage. The FLG signal is asserted indicating an overcurrent condition. Short-Circuit Applied to Enabled Output When a heavy load or short-circuit is applied to an enabled switch, a large transient current may flow until the currentlimit circuitry responds. Once this occurs the device limits current to less than the short-circuit current limit specification. Current-Limit Response--Ramped Load The MIC2026/76 current-limit profile exhibits a small foldback effect of about 200mA. Once this current-limit threshold is exceeded the device switches into a constant current mode. It is important to note that the device will supply current up to the current-limit threshold. Load and Fault Removed (Output Reset) Short-Circuit Fault VEN VOUT ILIMIT ILOAD IOUT VFLG Thermal Shutdown Reached 3ms typ. delay Figure 1. MIC2076-2 Fault Timing: Output Reset by Removing Load Short-Circuit Fault VEN Load/Fault Removed VOUT ILIMIT ILOAD IOUT VFLG Thermal Shutdown Reached 3ms typ. delay Figure 2. MIC2026-2 Fault Timing February 2001 11 MIC2026/2076 MIC2026/2076 Micrel Universal Serial Bus (USB) Power Distribution The MIC2026/76 is ideally suited for USB (Universal Serial Bus) power distribution applications. The USB specification defines power distribution for USB host systems such as PCs and USB hubs. Hubs can either be self-powered or buspowered (that is, powered from the bus). Figure 5 shows a typical USB Host application that may be suited for mobile PC applications employing USB. The requirement for USB host systems is that the port must supply a minimum of 500mA at an output voltage of 5V 5%. In addition, the output power delivered must be limited to below 25VA. Upon an overcurrent condition, the host must also be notified. To support hot-plug events, the hub must have a minimum of 120F of bulk capacitance, preferably low ESR electrolytic or tantulum. Please refer to Application Note 17 for more details on designing compliant USB hub and host systems. For bus-powered hubs, USB requires that each downstream port be switched on or off under control by the host. Up to four downstream ports each capable of supplying 100mA at 4.4V minimum are allowed. In addition, to reduce voltage droop on the upstream VBUS, soft-start is necessary. Although the hub can consume up to 500mA from the upstream bus, the hub must consume only 100mA max at start-up, until it enumerates with the host prior to requesting more power. The same requirements apply for bus-powered peripherals that have no downstream ports. Figure 6 shows a bus-powered hub. Applications Information Supply Filtering A 0.1F to 1F bypass capacitor positioned close to VIN and GND of the device is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Printed Circuit Board Hot-Plug The MIC2026/76 are ideal inrush current-limiters for hot-plug applications. Due to the integrated charge pump, the MIC2026/76 presents a high impedance when off and slowly becomes a low impedance as it turns on. This "soft-start" feature effectively isolates power supplies from highly capacitive loads by reducing inrush current. Figure 3 shows how the MIC2076 may be used in a card hot-plug application. In cases of extremely large capacitive loads (>400F), the length of the transient due to inrush current may exceed the delay provided by the integrated filter. Since this inrush current exceeds the current-limit delay specification, FLG will be asserted during this time. To prevent the logic controller from responding to FLG being asserted, an external RC filter, as shown in Figure 4, can be used to filter out transient FLG assertion. The value of the RC time constant should be selected to match the length of the transient, less tD(min) of the MIC2026/76. USB Controller MIC2026-2BM 1 VBUS 4.7 F to "Hot" Receptacle ENA USB Function 8 OUTA 2 7 FLGA IN 3 FLGB GND 6 4 ENB OUTB 5 CBULK USB Function CBULK GND USB Peripheral Cable Figure 3. Hot-Plug Application V+ Logic Controller OVERCURRENT MIC2026 10k 1 R C 2 3 4 EN OUTA FLGA IN FLGB GND ENB OUTB 8 7 6 5 Figure 4. Transient Filter MIC2026/2076 12 February 2001 MIC2026/2076 Micrel VCC 5.0V Ferrite Beads 10k 4.50V to 5.25V Upstream VBUS 100mA max. VBUS 10k VBUS D+ 3.3V USB Controller MIC5207-3.3 IN D+ 1F D- VIN OUT GND 1F GND MIC2026-2 ON/OFF ENA OUTA OVERCURRENT FLGA OVERCURRENT FLGB GND ENB OUTB ON/OFF IN D- 47F USB Port 1 GND 0.1F VBUS D+ D- 47F USB Port 2 GND Data Data (Two Pair) to USB Controller Figure 5. USB Two-Port Host Application 1.5k 2% Ferrite Beads 10k 10k 4.50V to 5.25V Upstream VBUS 3.3V USB Controller MIC5207-3.3 VBUS IN D+ 1F D- GND VIN OUT GND VBUS 1F D+ MIC2026-2 ENA ON/OFF OUTA OVERCURRENT FLGA IN OVERCURRENT FLGB GND ENB OUTB ON/OFF D- 47F USB Port 1 GND 0.1F VBUS D+ D- 47F USB Port 2 GND Data Data (Two Pair) to USB Controller Figure 6. USB Two-Port Bus-Powered Hub February 2001 13 MIC2026/2076 MIC2026/2076 Micrel Package Information 0.026 (0.65) MAX) PIN 1 0.157 (3.99) 0.150 (3.81) DIMENSIONS: INCHES (MM) 0.050 (1.27) TYP 0.064 (1.63) 0.045 (1.14) 0.197 (5.0) 0.189 (4.8) 0.020 (0.51) 0.013 (0.33) 45 0.0098 (0.249) 0.0040 (0.102) 0-8 0.010 (0.25) 0.007 (0.18) 0.050 (1.27) 0.016 (0.40) SEATING PLANE 0.244 (6.20) 0.228 (5.79) 8-Lead SOP (M) PIN 1 DIMENSIONS: INCH (MM) 0.380 (9.65) 0.370 (9.40) 0.255 (6.48) 0.245 (6.22) 0.135 (3.43) 0.125 (3.18) 0.300 (7.62) 0.013 (0.330) 0.010 (0.254) 0.018 (0.57) 0.100 (2.54) 0.130 (3.30) 0.380 (9.65) 0.320 (8.13) 0.0375 (0.952) 8-Pin DIP (N) MIC2026/2076 14 February 2001 MIC2026/2076 February 2001 Micrel 15 MIC2026/2076 MIC2026/2076 Micrel MICREL INC. TEL 1849 FORTUNE DRIVE SAN JOSE, CA 95131 + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA 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) 2001 Micrel Incorporated MIC2026/2076 16 February 2001