MIC2527.PDF

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MIC2524 8/98
MIC2524/2527
Micrel
MIC2524/2527
Quad USB Power Control Switch
Preliminary Information
General Description
The MIC2524 and MIC2527 are cost-effective high-side
power switches with four independently controlled channels,
optimized for self-powered and bus-powered Universal Se-
rial Bus (USB) applications. Few external components are
necessary to satisfy USB requirements.
The MIC2524/7 satisfies the following USB requirements:
each switch channel supplies up to 500mA as required by
USB downstream devices; the switch’s low on-resistance
meets USB voltage drop requirements; fault current is limited
to typically 750mA, well below the UL 25VA safety require-
ments; and a flag output is available to indicate fault condi-
tions to the local USB controller. Soft start eliminates the
momentary voltage drop on the upstream port that may occur
when the switch is enabled in bus-powered applications.
Additional features include thermal shutdown to prevent
catastrophic switch failure from high-current loads,
undervoltage lockout (UVLO) to ensure that the device re-
mains off unless there is a valid input voltage present, and
3.3V and 5V logic compatible enable inputs.
The MIC2524/7 is available in active-high and active-low
versions in 16-pin DIP and SOIC packages.
Features
• Compliant to USB specifications
• 4 independent switches
• 3V to 5.5V input
• 500mA minimum continuous load current per port
• 140m
W
m
A on-state supply current
A typical off-state supply current
• Output can be forced higher than input (off-state)
• Thermal shutdown
• 2.4V typical undervoltage lockout (UVLO)
• 1ms turn-on (soft-start) and fast turnoff
• Active-high or active-low enable versions
• 16-pin SOIC and DIP packages
Applications
• USB bus-powered hubs
• USB self-powered hubs
• USB monitors
• USB printers
Typical Application
MIC2527
5.1V ± 3%
5V ± 1%
or
MIC2524
5V ± 3%
Ferrite
Bead
10k
V BUS
D+
D–
GND
27k
MIC5207-3.3
LDO Regulator
IN
MIC2524
MIC2527
Downstream
USB
Port 1
500mA max.
33µF*
3.3V USB Controller
0.01µF
OUT
ON/OFF
OVERCURRENT
ENA IN
FLGA IN
ENB OUTA
FLGB OUTB
4.7
µF
1µF
GND
0.1
µF
V BUS
D+
D–
GND
Downstream
USB
Port 2
500mA max.
ENC
OUTC
33µF*
D+
D–
0.01µF
FLGC
END
OUTD
GND
GND
FLGD
GND
Bold lines indicate
0.1" wide, 1-oz. copper
high-current traces.
33µF*
V BUS
D+
D–
GND
Downstream
USB
Port 3
500mA max.
0.01µF
* 33µF, 16V tantalum or 100µF, 10V electrolytic per port
33µF*
V BUS
D+
D–
GND
Downstream
USB
Port 4
500mA max.
0.01µF
4-Port Self-Powered Hub
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
November 1998
1
MIC2524/2527
maximum on-resistance (MIC2524)
• 1.25A maximum short circuit current limit
• Individual open-drain fault flag pins
• 220
•1
m
V+
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MIC2524/2527
Micrel
Ordering Information
Part Number
On-Resistance
Enable
Temperature Range
Package
MIC2524-1BWM
100m
W
typ.
Active High
–40
°
C to +85
°
C
16-Pin SOIC
MIC2524-1BN
100m W typ.
Active High
–40 ° C to +85 ° C
16-pin DIP
MIC2524-2BWM
100m W typ.
Active Low
–40 ° C to +85 ° C
16-Pin SOIC
MIC2524-2BN
100m
W
typ.
Active Low
–40
°
C to +85
°
C
16-pin DIP
MIC2527-1BWM
200m
W
typ.
Active High
–40
°
C to +85
°
C
16-Pin SOIC
MIC2527-1BN
200m W typ.
Active High
–40 ° C to +85 ° C
16-pin DIP
MIC2527-2BWM
200m W typ.
Active Low
–40 ° C to +85 ° C
16-Pin SOIC
MIC2527-2BN
200m
W
typ.
Active Low
–40
°
C to +85
°
C
16-pin DIP
Pin Configuration
FLGA
1
16
FLGB
ENA 2
FLGA 1
LOGIC,
CHARGE
PUMP
3 OUTA
ENA
2
15
ENB
13 IN(A/B)
OUTA
3
14
OUTB
ENB 15
FLGB 16
LOGIC,
CHARGE
PUMP
14 OUTB
GND
4
13
IN(A/B)
6 OUTC
IN(C/D)
5
12
GND
ENC 7
FLGC 8
LOGIC,
CHARGE
PUMP
OUTC
6
11
OUTD
5 IN(C/D)
END 10
FLGD 9
LOGIC,
CHARGE
PUMP
ENC
7
10
END
11 OUTD
FLGC
8
9
FLGD
4 GND
12
16-Pin SOIC (WM)
16-Pin DIP (N)
Functional Pinout
Pin Description
Pin Number
Pin Name
Pin Function
1
FLGA
Flag A: (Output): Channel A open-drain fault flag output.
2
ENA
Enable A (Input): Channel A control input.
3
OUTA
Output A: Channel A switch output.
4, 12
GND
Ground: Supply return. Connect both pins to ground.
5
IN(C/D)
Supply Input: Channel C and D switch, logic, and charge-pump supply input.
6
OUTC
Output C: Channel C switch output.
7
ENC
Enable C (Input): Channel C control input.
8
FLGC
Flag C (Output): Channel C open-drain fault flag output.
9
FLGD
Flag D (Output): Channel D open-drain fault flag output.
10
END
Enable D (Input): Channel D control input.
11
OUTD
Output D: Channel D switch output.
13
IN(A/B)
Supply Input: Channel A and B switch, logic, and charge-pump supply input.
14
OUTB
Output B: Channel B switch output.
15
ENB
Enable B (Input): Channel B control input.
16
FLGB
Flag B (Output): Channel B open-drain fault flag output.
MIC2524/2527
2
November 1998
328081893.018.png 328081893.019.png
MIC2524/2527
Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (V IN ) ..................................................... +6V
Fault Flag Voltage (V FLG ) .............................................. +6V
Fault Flag Current (I FLG ) ............................................ 50mA
Output Voltage (V OUT ) .................................................. +6V
Output Current (I OUT ) ............................... Internally Limited
Control Input (V EN ) ......................................... –0.3V to 12V
Storage Temperature (T S ) ....................... –65
Operating Ratings (Note 2)
Supply Voltage (V IN ) ...................................... +3V to +5.5V
Ambient Operating Temperature (T A ) ........ –40
°
C to +85
°
C
Thermal Resistance
SOIC (
q JA ) ......................................................... 120
°
C/W
DIP(
q JA ) ............................................................. 130
°
C/W
C to +150
°
C
C
ESD Rating, Note 3 ...................................................... 2kV
°
Electrical Characteristics
V IN = +5V; T A = 25 ° C; unless noted.
Parameter
Condition
Min
Typ
Max
Units
Supply Current
Note 4 , switch off, OUT = open
1.5
10
m
A
Note 4 , all switches on, OUT = open
220
320
m A
Enable Input Threshold
low-to-high transition
2.1
2.4
V
high-to-low transition, Note 4
0.8
1.9
V
Enable Input Current
V EN = 0V to 5.5V
–1
± 0.01
1
m A
Enable Input Capacitance
1
pF
Switch Resistance
MIC2524, I OUT = 500mA, each switch
100
140
m W
MIC2527, I OUT = 500mA, each switch
200
300
m W
Output Turn-On Delay
R L = 10
W
each output
0.5
ms
Output Turn-On Rise Time
R L = 10 W each output
1
ms
Output Turnoff Delay
R L = 10 W each output
1
20
m s
Output Turnoff Fall Time
R L = 10
W
each output
1
20
m
s
Output Leakage Current
each output (output disabled)
10
m A
Continuous Load Current
each output
0.5
A
Short-Circuit Current Limit
each output (enable into load), V OUT = 4.0V
0.5
0.75
1.25
A
Current-Limit Threshold
ramped load applied to enabled output, V OUT £ 4.0V, Note 5
1.6
2.2
A
Overtemperature Shutdown
T J increasing
135
° C
Threshold
T J decreasing
125
° C
Error Flag Output Resistance
V IN = 5V, I L = 10mA
10
W
V IN = 3.3V, I L = 10mA
15
W
Error Flag Off Current
V FLAG = 5V
0.01
1
m A
UVLO Threshold
V IN = increasing
2.5
V
V IN = decreasing
2.3
V
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. Human body model, 1.5k in series with 100pF.
Note 4. Off is £ 0.8V and on is ³ 2.4V for the MIC252x-1. Off is ³ 2.4V and on is £ 0.8V for the MIC252x-2. The enable input has approximately 200mV
of hysteresis. See control threshold charts.
Note 5. See “Functional Characteristics: Current-Limit Response” photo.
November 1998
3
MIC2524/2527
°
Lead Temperature (Soldering 5 sec.) ....................... 260
328081893.020.png
MIC2524/2527
Micrel
Typical Characteristics
V IN = 5V; T A = 25 ° C; one switch section; unless noted.
Output On-Resistance
vs. Supply Voltage
Output On-Resistance
vs. Temperature
UVLO Threshold Voltage
vs. Temperature
110
140
3.0
120
RISING
100
2.5
Awaiting Full
Characterization
Data
100
FALLING
90
2.0
R L = 44
W
80
W
V IN = 5V
T = 25
°
C
80
3.0 3.5 4.0 4.5
5
5.5
60
-40 -20 0 20 40 60 80 100
1.5
-40 -20 0 20 40 60 80 100
SUPPLY VOLTAGE (V)
TEMPERATURE (
°
C)
TEMPERATURE (
°
C)
On-State Supply Current
vs. Supply Voltage
Off-State Supply Current
vs. Supply Voltage
Control Threshold
vs. Supply Voltage
500
2.0
2.5
400
1.5
2.0
300
V CTL RISING
1.0
200
1.5
100
0.5
V CTL FALLING
ALL SWITCHES OFF
ALL SWITCHES ON
0
0
2
4
6
8
0
1.0
2345678
2
3
4
5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
On-State Supply Current
vs. Temperature
Off-State Supply Current
vs. Temperature
Control Threshold
vs. Temperature
400
2.0
2.5
350
300
1.5
V EN RISING
2.0
250
200
1.0
V EN FALLING
150
1.5
100
0.5
50
ALL SWITCHES ON
ALL SWITCHES OFF
V IN = 5V
0
0
1.0
-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)
Output Rise Time
vs. Temperature
Output Fall Time
vs. Temperature
Current-Limit Threshold
vs. Temperature
5
1.0
2.0
4
0.8
1.8
CURRENT LIMIT
THRESHOLD
3
Awaiting Full
Characterization
Data
0.6
Awaiting Full
Characterization
Data
1.6
2
0.4
1.4
SHORT CIRCUIT
CURRENT LIMIT
1
0.2
1.2
0
-40 -20 0 20 40 60 80 100
0
-40 -20 0 20 40 60 80 100
1.0
-25
0
25
50
75 100
TEMPERATURE (
°
C)
TEMPERATURE (
°
C)
TEMPERATURE (
°
C)
MIC2524/2527
4
November 1998
R L = 44
328081893.021.png
 
MIC2524/2527
Micrel
Functional Characteristics
Input Voltage
Response
Turn-On, Turnoff
Characteristics
2.6V (UVLO) Threshold
V IN = 5.0V
C L = 15
144mA
R L = 35
½
V IN = 5.0V
µ
F
R L = 35
½
C L = 10
µ
F
TIME (100ns/div.)
TIME (2.5ms/div.)
Turn-On, Turnoff
Characteristics
Short Circuit Response
(Short Applied to Output)
144mA
1A Short Circuit Current Limit
½
C L = 150
µ
F
Thermal Shutdown
TIME (2.5ms/div.)
TIME (500ms/div.)
Short Circuit Response
Enable into Short Circuit
Thermal
Shutdown
1.1A Short Circuit
Current-Limiting
TIME (250ms/div.)
November 1998
5
MIC2524/2527
R L = 35
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