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MIC2026/2076
Micrel
MIC2026/2076
Dual-Channel Power Distribution Switch Preliminary Information
General Description
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.
Features
* * * * * * * * * * * * 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
VCONT. 10k 10k Logic Controller VIN ON/OFF OVERCURRENT OVERCURRENT ON/OFF MIC2026-2 ENA FLGA FLGB ENB OUTA IN GND OUTB Load 0.1F Load VCC 2.7V to 5.5V
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
March 2000
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MIC2026/2076
MIC2026/2076
Micrel
Ordering Information
Part Number MIC2026-1BM MIC2026-2BM MIC2026-1BN MIC2026-2BN MIC2076-1BM MIC2076-2BM MIC2076-1BN MIC2076-2BN Enable Active High Active Low Active High Active Low Active High Active Low Active High Active Low Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package 8-lead SOP 8-lead SOP 8-pin DIP 8-pin DIP 8-lead SOP 8-lead SOP 8-pin DIP 8-pin DIP
Pin Configuration
MIC2026/76
ENA FLGA FLGB ENB 1 2 3 4 8 7 6 5 OUTA IN GND OUTB
8-Lead SOP (BM) 8-Pin DIP (BN)
Pin Description
Pin Number 1 2 Pin Name ENA FLGA Pin Function Switch A Enable (Input): Logic-compatible enable input. Active high (-1) or active low (-2). 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. 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. Switch B Enable (Input): Logic-compatible enable input. Active-high (-1) or active-low (-2). Switch B (Output) Ground Input: Switch and logic supply input. Switch A (Output)
3
FLGB
4 5 6 7 8
ENB OUTB GND IN OUTA
MIC2026/2076
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MIC2026/2076
Micrel
Absolute Maximum Ratings (Note 1)
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
Operating Ratings (Note 2)
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 IDD Parameter Supply Current Condition MIC20x6-1, VENA = VENB 0.8V (switch off), OUT = open MIC20x6-2, VENA = VENB 2.4V (switch off), OUT = open MIC20x6-1, VENA = VENB 2.4V (switch on), OUT = open MIC20x6-2, VENA = VENB 0.8V (switch on), OUT = open VEN Enable Input Threshold low-to-high transition high-to-low transition Enable Input Hysteresis IEN RDS(on) Enable Input Current Enable Input Capacitance Switch Resistance VIN = 5V, IOUT = 500mA VIN = 3.3V, IOUT = 500mA Output Leakage Current OFF Current in Latched Thermal Shutdown tON tR tOFF tF ILIMIT Output Turn-On Delay Output Turn-On Rise Time Output Turnoff Delay Output Turnoff Fall Time Short-Circuit Output Current Current-Limit Threshold Short-Circuit Response Time tD Overcurrent Flag Response Delay Undervoltage Lockout Threshold MIC20x6-1, VENx 0.8V; MIC20x6-1, VENx 2.4V, (output off) MIC2076 (during thermal shutdown state) RL = 10, CL = 1F, see "Timing Diagrams" RL = 10, CL = 1F, see "Timing Diagrams" RL = 10, CL = 1F, see "Timing Diagrams" RL = 10, CL = 1F, see "Timing Diagrams" VOUT = 0V, enabled into short-circuit ramped load applied to output VOUT = 0V to IOUT = ILIMIT (short applied to output) VIN = 5V, apply VOUT = 0V until FLG low VIN = 3.3V, apply VOUT = 0V until FLG low VIN rising VIN falling 1.5 TBD 2.2 2.0 0.5 50 1.3 1.15 35 32 0.9 1.0 20 3 3 2.4 2.15 2.7 2.5 7 5 4.9 100 100 1.25 1.25 VEN = 0V to 5.5V -1 0.8 Min Typ 0.75 0.75 100 100 1.7 1.45 250 0.01 1 90 100 140 160 10 1 Max 5 5 160 160 2.4 Units A A A A V V mV A pF m m A A ms ms s s A A s ms ms V V
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MIC2026/2076
MIC2026/2076
Symbol Parameter Error Flag Output Resistance Error Flag Off Current Overtemperature Threshold Note 4 Condition IL = 10mA, VIN = 5V IL = 10mA, VIN = 3.3V VFLAG = 5V TJ increasing, each switch TJ decreasing, each switch TJ increasing, both switches TJ decreasing, both switches
Note 1. Note 2. Note 3. Note 4. 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.
Micrel
Min Typ 10 15 Max 25 40 10 140 120 160 150 Units A C C C C
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 VOUT 10% 90% 90% 10% tF
Output Rise and Fall Times
VEN
50% tOFF tON
VOUT
90% 10%
Active-Low Switch Delay Times (MIC20x6-2)
VEN
50% tOFF tON
VOUT
90% 10%
Active-High Switch Delay Times (MIC20x6-1)
MIC2026/2076
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MIC2026/2076
Micrel
Supply On-Current vs. Temperature
180 ON-RESISTANCE (m) 160 140 CURRENT (A) 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 3.3V 5V 160 140
On-Resistance vs. Temperature
5 3.3V RISE TIME (ms) 4 3 2 1
Turn-On Rise Time vs. Temperature
120 100 80 60 40 20
5V
RL=10 CL=1F VIN = 3.3V
IOUT = 500mA
VIN = 5V 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
200 200
On-Resistance vs. Input Voltage
2.5 2.0 +85C +25C 100 -40C 50 IOUT = 500mA RISE TIME (ms)
Turn-On Rise Time vs. Input Voltage
CURRENT (A)
150
RESISTANCE (m)
-40C
150
+85C 1.5 1.0 0.5 0 2.5 -40C RL=10 CL=1F 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 +25C
100 +25C 50 +85C
0 2.5
3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V)
5.5
0 2.5
3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V)
5.5
1000 CURRENT LIMIT (mA) 800 600 VIN = 5V 400 200 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) VIN = 3.3V
CURRENT LIMIT THRESHOLD (mA)
Short-Circuit Current-Limit vs. Temperature
Current-Limit Threshold vs. Temperature
1200 VIN = 5V 1000 800 600 400 200 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) VIN = 3.3V FALL TIME (s) 300 400
Fall Time vs. Temperature
VIN = 3.3V 200
RL=10 CL=1F
100
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
CURRENT LIMIT THRESHOLD (mA)
Short-Circuit Current-Limit vs. Input Voltage
800 700 CURRENT LIMIT (mA) 600 500 +85C 400 300 200 100 0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 +25C -40C
1200 1000 800 600 400 200 0 2.5
Current-Limit Threshold vs. Input Voltage
300 250 RISE TIME (s) +85C +25C -40C 200 150 100 50 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 0 2.5
Fall Time vs. Input Voltage
TA = 25C CL = 1F RL = 10 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5
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MIC2026/2076
MIC2026/2076
Micrel
Enable Threshold vs. Temperature
2.5 ENABLE THRESHOLD (V) 2.0 1.5 VEN FALLING 1.0 0.5 VIN = 5V 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) VEN RISING 5
Flag Delay vs. Temperature
0.16 SUPPLY CURRENT (A) VIN = 3.3V DELAY TIME (ms) 4 VIN = 5V 3 2 1 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 0.14 0.12 0.1 0.08 0.06 0.04 0.02
Supply Off Current vs. Temperature
5V
3.3V
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
2.5 ENABLE THRESHOLD (V) 2.0 1.5 1.0 0.5
Enable Threshold vs. Input Voltage
5 4 3 2 1 0 2.5
Flag Delay vs. Input Voltage
0.18 SUPPLY CURRENT (A) +85C 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0 2.5
Supply Off Current vs. Input Voltage
DELAY TIME (ms)
VEN RISING
+85C
+25C -40C
VEN FALLING
+25C -40C
TA = 25C 0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) 5.5
3.0
3.5 4.0 4.5 VOLTAGE (V)
5.0
5.5
UVLO Threshold vs. Temperature
3.0 UVLO THRESHOLD (V) 2.5 2.0 V IN FALLING 1.5 1.0 0.5 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) V IN RISING
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Micrel
Functional Characteristics
UVLO--VIN Rising (MIC2026-1)
VIN VFLG (2V/div.) (2V/div.) VFLG VIN (2V/div.) (2V/div.)
UVLO--VIN Falling (MIC2026-1)
2.4V
2.2V
VEN = VIN CL = 57F RL = 35
VOUT IOUT (100mA/div.) (5V/div.)
VOUT (2V/div.)
IOUT (100mA/div.)
VEN = VIN CL = 57F RL = 35
TIME (10ms/div.)
TIME (100ms/div.)
VEN VOUT VFLG (5V/div.) (5V/div.) (10V/div.)
712mA (Inrush Current) VIN = 5V CL = 147F RL = 35 140mA
VOUT VFLG VEN (5V/div.) (5V/div.) (10V/div.)
Turn-On/Turnoff (MIC2026-1)
Turn-On (MIC2026-1)
IOUT (200mA/div.)
IOUT (200mA/div.)
VIN = 5V CL = 147F RL = 35 140mA
TIME (10ms/div.)
TIME (500s/div.)
VEN VOUT VFLG (5V/div.) (5V/div.) (10V/div.)
Turnoff (MIC2026-1)
VEN VOUT VFLG (5V/div.) (5V/div.) (10V/div.)
Enabled Into Short (MIC2026-1)
3.1ms (tD)
700mA
IOUT (200mA/div.)
140mA
VIN = 5V CL = 147F RL = 35
IOUT (500mA/div.)
VIN = 5V
TIME (5ms/div.)
TIME (500s/div.)
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MIC2026/2076
MIC2026/2076
Micrel
Inrush Current Response (MIC2026-1)
VEN VFLG (5V/div.) (10V/div.) VFLG VIN (10V/div.) (10V/div.)
Current-Limit Response (Ramped Load-MIC2026-1)
VIN = 5V CL = 47F
CL = 110F
IOUT (200mA/div.)
CL = 210F CL = 310F
VIN = 5V RL = 31
VOUT (5V/div.)
IOUT (500mA/div.)
Current-Limit Threshold (1A)
Short-Circuit Current (800mA) Thermal Shutdown
Short Removed
Thermal Shutdown Hysteresis
CL = 10F TIME (1ms/div.)
TIME (100ms/div.)
Current-Limit Response (Stepped Short--MIC2026-1)
VEN VFLG (5V/div.) (10V/div.)
Current-Limit Response (MIC2026-1)
VIN = 5V CL = 47F RL = stepped short
VOUT (5V/div.)
VIN = 5V CL = 0 RL = stepped short
VOUT (5V/div.)
IOUT (2A/div.)
IOUT (5A/div.)
Short-Circuit (800mA)
800mA
TIME (1ms/div.)
TIME (50s/div.)
VFLGA VENB (5V/div.) (10V/div.)
VOUTA = No Load (No Thermal Shutdown)
VENA VFLGB VFLGA (5V/div.) (5V/div.) (10V/div.)
Independent Thermal Shutdown (MIC2026-1)
Independent Thermal Shutdown (MIC2026-1)
VFLGB (5V/div.)
VOUTB = No Load (No Thermal Shutdown)
IOUTA (500mA/div.)
IOUTB (500mA/div.)
Thermal Shutdown
Thermal Shutdown
TIME (100ms/div.)
TIME (100ms/div.)
MIC2026/2076
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MIC2026/2076
Micrel
Load Removed
VOUT VFLG (5V/div.) (10V/div.)
No Load
RL = 0
VEN (10V/div.)
Thermal Shutdown (MIC2076-2--Output Latched Off)
Thermal Shutdown (Output Reset by Toggling Enable--MIC2076-2)
VFLG (5V/div.)
Enable Reset
Output Reset Thermal Shutdown
IOUTB (500mV/div.)
IOUT (500mA/div.)
VIN = 5V CL = 47F VENB = 0V
VOUT (5V/div.)
Ramp Load to Short
Output Reset
CL = 57F RL = 35
Thermal Shutdown VIN = 5V
TIME (2.5s/div.)
TIME (100ms/div.)
VEN VFLG (5V/div.) (10V/div.)
Thermal Shutdown (Output Reset by Removing Load--MIC2076-2)
RL = 0
Independent Thermal Shutdown (MIC2076-2)
Load Removed No Load
VFLGB VFLGA (5V/div.) (5V/div.)
Output Latched Off Ramp Load to Short
No Thermal Shutdown on Channel B
Load Removed (Output Reset)
VOUT (5V/div.)
Output Reset Thermal Shutdown VIN = 5V CL = 47F VENB = 0V VENA = 0V
IOUT (500mA/div.)
Thermal Shutdown
VIN = 5V CL = 47F
TIME (100ms/div.)
IOUTA (500mA/div.)
TIME (2.5s/div.)
Independent Thermal Shutdown (MIC2076-2)
RL = 0
VFLGA VFLGB (5V/div.) (10V/div.)
Load Removed
No Load
Output Reset
No Thermal Shutdown on Channel A VIN = 5V CL = 47F VENB = 0V VENA = 0V
IOUTB (500mA/div.)
Thermal Shutdown
TIME (2.5s/div.)
March 2000
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MIC2026/2076
MIC2026/2076
Micrel
Block Diagram
FLGA
FLAG RESPONSE DELAY ENA CHARGE PUMP GATE CONTROL CURRENT LIMIT
OUTA
OSC.
THERMAL SHUTDOWN
UVLO
1.2V REFERENCE
IN
CHARGE PUMP GATE CONTROL ENB
CURRENT LIMIT
FLAG RESPONSE DELAY
OUTB
FLGB MIC2026/2076 GND
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.
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 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
MIC2026/2076
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MIC2026/2076
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:
Micrel
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) VEN VOUT ILIMIT ILOAD IOUT VFLG 3ms typ. delay Short-Circuit Fault
Thermal Shutdown Reached
Figure 1. MIC2076-2 Fault Timing: Output Reset by Removing Load
VEN VOUT ILIMIT ILOAD IOUT VFLG 3ms typ. delay
Short-Circuit Fault Load/Fault Removed
Thermal Shutdown Reached
Figure 2. MIC2026-2 Fault Timing
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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 VBUS 4.7 F
1 2 3 4
ENA FLGA FLGB ENB
OUTA IN GND OUTB
8 7 6 5
USB Function CBULK USB Function CBULK
to "Hot" Receptacle
GND Cable USB Peripheral
Figure 3. Hot-Plug Application
V+ Logic Controller OVERCURRENT 10k
1
MIC2026 EN FLGA FLGB ENB OUTA IN GND OUTB
8 7 6 5
R C
2 3 4
Figure 4. Transient Filter
MIC2026/2076
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March 2000
MIC2026/2076
Micrel
VCC 5.0V 10k 4.50V to 5.25V Upstream VBUS 100mA max. VBUS D+ D- GND 1F 10k MIC5207-3.3 IN OUT GND 1F 3.3V USB Controller VIN ON/OFF OVERCURRENT OVERCURRENT ON/OFF MIC2026-2 ENA FLGA FLGB ENB OUTA IN GND OUTB 47F Data 47F 0.1F
Ferrite Beads VBUS D+ D- GND USB Port 1
VBUS D+ D- GND Data (Two Pair) to USB Controller USB Port 2
Figure 5. USB Two-Port Host Application
1.5k 2% 4.50V to 5.25V Upstream VBUS VBUS D+ D- GND 1F
10k 10k
Ferrite Beads VBUS MIC2026-2 ENA FLGA FLGB ENB OUTA IN GND OUTB 47F 47F 0.1F VBUS D+ D- GND Data (Two Pair) to USB Controller USB Port 2 D+ D- GND USB Port 1
MIC5207-3.3 IN OUT GND 1F
3.3V USB Controller VIN ON/OFF
OVERCURRENT OVERCURRENT ON/OFF
Data
Figure 6. USB Two-Port Bus-Powered Hub
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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
0.020 (0.51) 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0-8 SEATING PLANE 45 0.010 (0.25) 0.007 (0.18)
0.064 (1.63) 0.045 (1.14)
0.197 (5.0) 0.189 (4.8)
0.050 (1.27) 0.016 (0.40) 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)
0.135 (3.43) 0.125 (3.18)
0.255 (6.48) 0.245 (6.22) 0.300 (7.62)
0.013 (0.330) 0.010 (0.254) 0.018 (0.57) 0.100 (2.54) 0.130 (3.30) 0.0375 (0.952) 0.380 (9.65) 0.320 (8.13)
8-Pin DIP (N)
MIC2026/2076
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MIC2026/2076
Micrel
March 2000
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MIC2026/2076
MIC2026/2076
Micrel
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
MIC2026/2076
16
March 2000

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