MIC2026 [MICREL]
Dual-Channel Power Distribution Switch Preliminary Information; 双通道配电开关的初步信息
| 型号： | MIC2026 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Dual-Channel Power Distribution Switch Preliminary Information |
| 文件： | 总16页 (文件大小：176K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC2026/2076
Dual-Channel Power Distribution Switch
Preliminary Information
General Description
Features
TheMIC2026andMIC2076arehigh-sideMOSFETswitches
optimized for general-purpose power distribution requiring
circuit protection.
• 140mΩ 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
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 shut-
down 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.
Pin-compatible with MIC2526
A fault status output flag is asserted during overcurrent and
thermal shutdown conditions. Transient faults are internally
filtered.
Applications
• USB peripherals
• General purpose power switching
• ACPI power distribution
• Notebook PCs
The MIC2026/76 are available in 8-pin DIP or 8-lead SOP.
• PDAs
• PC card hot swap
Typical Application
VCC
2.7V to 5.5V
VCONT.
10k
10k
Logic Controller
MIC2026-2
VIN
ON/OFF
Load
0.1µF
Load
ENA
OUTA
IN
OVERCURRENT
OVERCURRENT
ON/OFF
FLGA
FLGB
ENB
GND
OUTB
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
1
MIC2026/2076
MIC2026/2076
Micrel
Ordering Information
Part Number
Enable
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
8-lead SOP
8-lead SOP
8-pin DIP
MIC2026-1BM
MIC2026-2BM
MIC2026-1BN
MIC2026-2BN
MIC2076-1BM
MIC2076-2BM
MIC2076-1BN
MIC2076-2BN
Active High
Active Low
Active High
Active Low
Active High
Active Low
Active High
Active Low
8-pin DIP
8-lead SOP
8-lead SOP
8-pin DIP
8-pin DIP
Pin Configuration
MIC2026/76
ENA
FLGA
FLGB
ENB
OUTA
IN
1
2
3
4
8
7
6
5
GND
OUTB
8-Lead SOP (BM)
8-Pin DIP (BN)
Pin Description
Pin Number
Pin Name
Pin Function
1
ENA
Switch A Enable (Input): Logic-compatible enable input. Active high (-1) or
active low (-2).
2
3
4
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.
FLGB
ENB
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).
5
6
7
8
OUTB
GND
IN
Switch B (Output)
Ground
Input: Switch and logic supply input.
Switch A (Output)
OUTA
MIC2026/2076
2
March 2000
MIC2026/2076
Micrel
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Supply Voltage (V ) ...................................... –0.3V to +6V
Supply Voltage (V ) ................................... +2.7V to +5.5V
IN
IN
Fault Flag Voltage (V
Fault Flag Current (I
)..............................................+6V
Ambient Temperature (T ) ......................... –40°C to +85°C
FLG
A
) ............................................25mA
) ..................................................+6V
Junction Temperature Range (T ) ........... Internally Limited
FLG
OUT
J
Output Voltage (V
Output Current (I
Thermal Resistance
SOP (θ ) ..........................................................160°C/W
) ............................... Internally Limited
JA
OUT
DIP(θ ).............................................................105°C/W
JA
Enable Input (I ).................................... –0.3V to V + 3V
EN
IN
Storage Temperature (T ) ...................... –65°C to +150 °C
S
ESD Rating, Note 3
Electrical Characteristics
VIN = +5V; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted
Symbol
Parameter
Condition
Min
Typ
Max
Units
IDD
Supply Current
MIC20x6-1, VENA = VENB ≤ 0.8V
(switch off), OUT = open
0.75
5
µA
MIC20x6-2, VENA = VENB ≥ 2.4V
(switch off), OUT = open
0.75
100
100
5
µA
µA
µA
MIC20x6-1, VENA = VENB ≥ 2.4V
(switch on), OUT = open
160
160
2.4
MIC20x6-2, VENA = VENB ≤ 0.8V
(switch on), OUT = open
VEN
Enable Input Threshold
low-to-high transition
high-to-low transition
1.7
1.45
250
0.01
1
V
0.8
V
Enable Input Hysteresis
Enable Input Current
Enable Input Capacitance
Switch Resistance
mV
µA
pF
mΩ
mΩ
µA
IEN
VEN = 0V to 5.5V
–1
1
RDS(on)
VIN = 5V, IOUT = 500mA
VIN = 3.3V, IOUT = 500mA
90
140
160
10
100
Output Leakage Current
MIC20x6-1, VENx ≤ 0.8V;
MIC20x6-1, VENx ≥ 2.4V, (output off)
OFF Current in
MIC2076
50
µA
Latched Thermal Shutdown
(during thermal shutdown state)
tON
tR
tOFF
tF
Output Turn-On Delay
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
VOUT = 0V, enabled into short-circuit
1.3
1.15
35
5
ms
ms
µs
µs
A
Output Turn-On Rise Time
Output Turnoff Delay
4.9
100
100
1.25
1.25
Output Turnoff Fall Time
Short-Circuit Output Current
Current-Limit Threshold
Short-Circuit Response Time
32
ILIMIT
0.5
0.9
1.0
20
ramped load applied to output
A
VOUT = 0V to IOUT = ILIMIT
µs
(short applied to output)
VIN = 5V, apply VOUT = 0V until FLG low
VIN = 3.3V, apply VOUT = 0V until FLG low
VIN rising
tD
Overcurrent Flag Response
Delay
1.5
TBD
2.2
3
3
7
ms
ms
V
Undervoltage Lockout
Threshold
2.4
2.15
2.7
2.5
VIN falling
2.0
V
March 2000
3
MIC2026/2076
MIC2026/2076
Micrel
Symbol
Parameter
Condition
Min
Typ
10
Max
25
Units
Ω
Error Flag Output
Resistance
IL = 10mA, VIN = 5V
IL = 10mA, VIN = 3.3V
VFLAG = 5V
15
40
Ω
Error Flag Off Current
10
µA
Overtemperature Threshold
Note 4
TJ increasing, each switch
TJ decreasing, each switch
140
120
°C
°C
TJ increasing, both switches
TJ decreasing, both switches
160
150
°C
°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 140°C. If the die reaches approximately
160°C, both channels will shut down, even if neither channel is in current limit.
Test Circuit
VOUT
Device
Under
Test
OUT
RL
CL
Timing Diagrams
tR
tF
90%
10%
90%
VOUT
10%
Output Rise and Fall Times
50%
VEN
tOFF
tON
90%
VOUT
10%
Active-Low Switch Delay Times (MIC20x6-2)
VEN
50%
tOFF
tON
90%
VOUT
10%
Active-High Switch Delay Times (MIC20x6-1)
MIC2026/2076
4
March 2000
MIC2026/2076
Micrel
Supply On-Current
vs. Temperature
On-Resistance
vs. Temperature
Turn-On Rise Time
vs. Temperature
180
160
140
120
100
80
160
140
120
100
80
5
4
3
2
1
0
3.3V
5V
5V
RL=10Ω
CL=1µF
3.3V
VIN = 3.3V
60
60
IOUT = 500mA
40
40
20
20
VIN = 5V
0
0
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Supply On-Current
vs. Input Voltage
On-Resistance
vs. Input Voltage
Turn-On Rise Time
vs. Input Voltage
200
150
100
50
200
150
100
50
2.5
2.0
1.5
1.0
0.5
0
-40°C
+85°C
+25°C
+85°C
+25°C
-40°C
+25°C
+85°C
-40°C
RL=10Ω
CL=1µF
IOUT = 500mA
0
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Short-Circuit Current-Limit
vs. Temperature
Current-Limit Threshold
vs. Temperature
Fall Time
vs. Temperature
1000
1200
400
VIN = 5V
1000
800
600
400
200
0
VIN = 3.3V
VIN = 5V
800
600
400
200
0
300
200
100
0
VIN = 3.3V
VIN = 3.3V
RL=10Ω
CL=1µF
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Short-Circuit Current-Limit
vs. Input Voltage
Current-Limit Threshold
vs. Input Voltage
Fall Time
vs. Input Voltage
1200
1000
800
600
400
200
0
800
700
600
500
400
300
200
100
0
300
250
200
150
100
50
+25°C
-40°C
+85°C
+25°C
-40°C
+85°C
TA = 25°C
L = 1µF
L = 10Ω
C
R
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
March 2000
5
MIC2026/2076
MIC2026/2076
Micrel
Enable Threshold
vs. Temperature
Flag Delay
vs. Temperature
Supply Off Current
vs. Temperature
2.5
2.0
1.5
1.0
0.5
5
4
3
2
1
0.16
0.14
0.12
0.1
VIN = 3.3V
5V
VEN RISING
VIN = 5V
VEN FALLING
0.08
0.06
0.04
0.02
0
3.3V
VIN = 5V
0
0
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Enable Threshold
vs. Input Voltage
Flag Delay
vs. Input Voltage
Supply Off Current
vs. Input Voltage
2.5
2.0
1.5
1.0
0.5
0
5
4
3
2
1
0
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
+85°C
+25°C
VEN RISING
+85°C
VEN FALLING
-40°C
+25°C
-40°C
TA = 25°C
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VOLTAGE (V)
UVLO Threshold
vs. Temperature
3.0
VIN RISING
2.5
2.0
1.5
1.0
0.5
0
VIN FALLING
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
MIC2026/2076
6
March 2000
MIC2026/2076
Micrel
Functional Characteristics
UVLO—VIN Rising
UVLO—VIN Falling
(MIC2026-1)
(MIC2026-1)
2.2V
2.4V
VEN = VIN
CL = 57µF
RL = 35Ω
VEN = VIN
CL = 57µF
RL = 35Ω
TIME (10ms/div.)
TIME (100ms/div.)
Turn-On
(MIC2026-1)
Turn-On/Turnoff
(MIC2026-1)
712mA
(Inrush Current)
VIN = 5V
CL = 147µF
RL = 35Ω
VIN = 5V
CL = 147µF
RL = 35Ω
140mA
140mA
TIME (500µs/div.)
TIME (10ms/div.)
Enabled Into Short
(MIC2026-1)
Turnoff
(MIC2026-1)
3.1ms (tD)
700mA
VIN = 5V
CL = 147µF
RL = 35Ω
VIN = 5V
140mA
TIME (500µs/div.)
TIME (5ms/div.)
March 2000
7
MIC2026/2076
MIC2026/2076
Micrel
Inrush Current Response
(MIC2026-1)
Current-Limit Response
(Ramped Load–MIC2026-1)
VIN = 5V
CL = 47µF
CL = 110µF
CL = 210µF
CL = 310µF
VIN = 5V
RL = 31Ω
Short
Removed
Short-Circuit
Current-Limit
Threshold
(1A)
Current (800mA)
Thermal Shutdown
Thermal
Shutdown
Hysteresis
CL = 10µF
TIME (1ms/div.)
TIME (100ms/div.)
Current-Limit Response
(Stepped Short—MIC2026-1)
Current-Limit Response
(MIC2026-1)
VIN = 5V
CL = 47µF
RL = stepped short
VIN = 5V
CL = 0
RL = stepped short
Short-Circuit (800mA)
800mA
TIME (1ms/div.)
TIME (50µs/div.)
Independent Thermal Shutdown
(MIC2026-1)
Independent Thermal Shutdown
(MIC2026-1)
VOUTA = No Load
(No Thermal Shutdown)
VOUTB = No Load
(No Thermal Shutdown)
Thermal Shutdown
Thermal Shutdown
TIME (100ms/div.)
TIME (100ms/div.)
MIC2026/2076
8
March 2000
MIC2026/2076
Micrel
Thermal Shutdown
Thermal Shutdown
(MIC2076-2—Output Latched Off)
(Output Reset by Toggling Enable—MIC2076-2)
No Load
Load Removed
RL = 0
Enable
Reset
Ramp Load
to Short
Output
Reset
Output
Reset
VIN = 5V
CL = 47µF
VENB = 0V
Thermal
Shutdown
CL = 57µF
RL = 35Ω
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)
RL = 0
Load
Removed
No
Load
No Thermal Shutdown on Channel B
Output Reset
Output
Load Removed
(Output Reset)
Latched Off
Ramp Load
to Short
Thermal
Shutdown
VIN = 5V
CL = 47µF
VENB = 0V
VENA = 0V
Thermal
Shutdown
VIN = 5V
CL = 47µF
TIME (100ms/div.)
TIME (2.5s/div.)
Independent Thermal Shutdown
(MIC2076-2)
Load
Removed
No
Load
RL = 0
Output Reset
No Thermal Shutdown on Channel A
VIN = 5V
CL = 47µF
VENB = 0V
VENA = 0V
Thermal
Shutdown
TIME (2.5s/div.)
March 2000
9
MIC2026/2076
MIC2026/2076
Micrel
Block Diagram
FLGA
OUTA
FLAG
RESPONSE
DELAY
ENA
CHARGE
PUMP
GATE
CONTROL
CURRENT
LIMIT
THERMAL
SHUTDOWN
1.2V
REFERENCE
IN
OSC.
UVLO
CHARGE
PUMP
CURRENT
LIMIT
GATE
CONTROL
ENB
FLAG
RESPONSE
DELAY
OUTB
FLGB
MIC2026/2076
GND
The MIC2026 will automatically reset its output when the die
temperature cools down to 120°C. 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.
Functional Description
Input and Output
INisthepowersupplyconnectiontothelogiccircuitryandthe
drain of the output MOSFET. OUT is the source of the output
MOSFET. In a typical circuit, current flows from IN to OUT
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.
toward the load. If V
is greater than V , current will flow
OUT
IN
from OUT to IN, since the switch is bidirectional when
enabled. The output MOSFET and driver circuitry are also
designedtoallowtheMOSFETsourcetobeexternallyforced
to a higher voltage than the drain (V
switch is disabled. In this situation, the MIC2026/76 prevents
undesirable current flow from OUT to IN.
> V ) when the
OUT
IN
Power Dissipation
The device’s junction temperature depends on several fac-
tors 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.
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 140°C and the overheated channel is in current limit.
The other channel is not effected. If however, the die tem-
peratureexceeds160°C, bothchannelswillbeshutoff. 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
whentheload(suchasaUSBdevice)isremoved. Theoutput
can also be reset by toggling EN. Refer to Figure 1 for timing
details.
2
P = R
× I
OUT
D
DS(on)
Total power dissipation of the device will be the summation of
P for both channels. To relate this to junction temperature,
D
the following equation can be used:
T = P × θ + T
A
J
D
JA
where:
T = junction temperature
J
T = ambient temperature
A
θ
= is the thermal resistance of the package
JA
MIC2026/2076
10
March 2000
MIC2026/2076
Micrel
Current Sensing and Limiting
Fault Flag
The current-limit threshold is preset internally. The preset
levelpreventsdamagetothedeviceandexternalloadbutstill
allows a minimum current of 500mA to be delivered to the
load.
The FLG signal is an N-channel open-drain MOSFET output.
FLG is asserted (active-low) when either an overcurrent or
thermalshutdownconditionoccurs.Inthecaseofanovercur-
rent condition, FLG will be asserted only after the flag
response delay time, t , has elapsed. This ensures that FLG
The current-limit circuit senses a portion of the output MOS-
FET switch current. The current-sense resistor shown in the
blockdiagramisvirtualandhasnovoltagedrop. Thereaction
to an overcurrent condition varies with three scenarios:
D
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
whenahighlycapacitiveloadisconnectedandcausesahigh
transient inrush current that exceeds the current-limit thresh-
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.
old for up to 1ms. The FLG response delay time t is typically
3ms.
D
Undervoltage Lockout
Undervoltage lockout (UVLO) prevents the output MOSFET
Short-Circuit Applied to Enabled Output
fromturningonuntilV exceedsapproximately2.5V. Under-
IN
When a heavy load or short-circuit is applied to an enabled
switch, a large transient current may flow until the current-
limit circuitry responds. Once this occurs the device limits
currenttolessthantheshort-circuitcurrentlimitspecification.
voltage detection functions only when the switch is enabled.
Current-Limit Response—Ramped Load
TheMIC2026/76current-limitprofileexhibitsasmallfoldback
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
Thermal
Shutdown
Reached
VFLG
3ms typ.
delay
Figure 1. MIC2076-2 Fault Timing: Output Reset by Removing Load
Short-Circuit Fault
V
EN
Load/Fault
Removed
V
OUT
I
LIMIT
I
LOAD
Thermal
Shutdown
Reached
I
OUT
3ms typ.
delay
V
FLG
Figure 2. MIC2026-2 Fault Timing
March 2000
11
MIC2026/2076
MIC2026/2076
Micrel
Universal Serial Bus (USB) Power Distribution
Applications Information
The MIC2026/76 is ideally suited for USB (Universal Serial
Bus) power distribution applications. The USB specification
definespowerdistributionforUSBhostsystemssuchasPCs
and USB hubs. Hubs can either be self-powered or bus-
powered (that is, powered from the bus). Figure 5 shows a
typicalUSBHostapplicationthatmaybesuitedformobilePC
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
deliveredmustbelimitedtobelow 25VA.Uponanovercurrent
condition, the host must also be notified. To support hot-plug
events, the hub must have a minimum of 120µF 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.
Supply Filtering
A 0.1µF to 1µF bypass capacitor positioned close to V and
IN
GNDofthedeviceisstronglyrecommendedtocontrolsupply
transients. Without a bypass capacitor, an output short may
cause sufficient ringing on the input (from supply lead induc-
tance) 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 ca-
pacitiveloadsbyreducinginrushcurrent.Figure3showshow
the MIC2076 may be used in a card hot-plug application.
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
In cases of extremely large capacitive loads (>400µF), the
length of the transient due to inrush current may exceed the
delay provided by the integrated filter. Since this inrush
currentexceedsthecurrent-limitdelayspecification, FLGwill
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
the upstream V
, soft-start is necessary. Although the hub
BUS
can consume up to 500mA from the upstream bus, the hub
must consume only 100mA max at start-up, until it enumer-
ates with the host prior to requesting more power. The same
requirementsapplyforbus-poweredperipheralsthathaveno
downstream ports. Figure 6 shows a bus-powered hub.
selectedtomatchthelengthofthetransient, lesst
MIC2026/76.
ofthe
D(min)
USB
Controller
MIC2026-2BM
USB
Function
1
8
ENA
OUTA
VBUS
2
3
4
7
FLGA
FLGB
ENB
IN
GND
4.7
µF
CBULK
6
to "Hot"
Receptacle
USB
Function
5
OUTB
CBULK
GND
USB Peripheral
Cable
Figure 3. Hot-Plug Application
V+
MIC2026
10k
R
Logic Controller
1
2
3
4
8
EN
OUTA
7
6
OVERCURRENT
FLGA
FLGB
ENB
IN
GND
C
5
OUTB
Figure 4. Transient Filter
MIC2026/2076
12
March 2000
MIC2026/2076
Micrel
VCC
5.0V
Ferrite
Beads
10k
10k
4.50V to 5.25V
Upstream VBUS
100mA max.
VBUS
D+
3.3V USB Controller
MIC2026-2
MIC5207-3.3
IN OUT
USB
Port 1
D–
VBUS
D+
47µF
0.1µF
VIN
ON/OFF
ENA
OUTA
IN
GND
OVERCURRENT
OVERCURRENT
ON/OFF
FLGA
FLGB
ENB
1µF
1µF
D–
GND
GND
OUTB
VBUS
D+
GND
USB
Port 2
D–
47µF
GND
Data
Data
(Two Pair)
to USB
Controller
Figure 5. USB Two-Port Host Application
Ferrite
Beads
1.5k 2%
10k
10k
VBUS
D+
4.50V to 5.25V
Upstream VBUS
3.3V USB Controller
VIN
MIC2026-2
MIC5207-3.3
IN OUT
USB
Port 1
D–
VBUS
D+
47µF
0.1µF
ON/OFF
ENA
OUTA
IN
GND
OVERCURRENT
OVERCURRENT
ON/OFF
FLGA
FLGB
ENB
1µF
1µF
D–
GND
GND
OUTB
VBUS
D+
GND
USB
Port 2
D–
47µF
GND
Data
Data
(Two Pair)
to USB
Controller
Figure 6. USB Two-Port Bus-Powered Hub
March 2000
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)
0.020 (0.51)
0.013 (0.33)
0.050 (1.27)
TYP
45°
0.0098 (0.249)
0.0040 (0.102)
0.010 (0.25)
0.007 (0.18)
0°–8°
0.197 (5.0)
0.189 (4.8)
0.050 (1.27)
0.016 (0.40)
SEATING
PLANE
0.064 (1.63)
0.045 (1.14)
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)
0.380 (9.65)
0.320 (8.13)
0.018 (0.57)
0.100 (2.54)
0.130 (3.30)
0.0375 (0.952)
8-Pin DIP (N)
MIC2026/2076
14
March 2000
MIC2026/2076
Micrel
March 2000
15
MIC2026/2076
MIC2026/2076
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.
© 2000 Micrel Incorporated
MIC2026/2076
16
March 2000
相关型号：
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