MIC2524/2527
Micrel
MIC2524/2527
Quad USB Power Control Switch
Not Recommended for New Designs
Refer to MIC2027
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
•
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•
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Compliant to USB specifications
UL Recognized Component
4 independent switches
3V to 5.5V input
500mA minimum continuous load current per port
140mΩ maximum on-resistance (MIC2524)
1.25A maximum short circuit current limit
Individual open-drain fault flag pins
220µA on-state supply current
1µA 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
USB bus-powered hubs
USB self-powered hubs
USB monitors
USB printers
Applications
Typical Application
MIC2527
5.1V
±
3%
5V
±
1%
or
MIC2524
5V
±3%
MIC5207-3.3
LDO Regulator
IN
4.7
µF
OUT
1µF
GND
Ferrite
Bead
10k
27k
3.3V USB Controller
V+
ON/OFF
OVERCURRENT
MIC2524
MIC2527
ENA
FLGA
ENB
FLGB
D+
D–
GND
ENC
FLGC
END
FLGD
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
* 33µF, 16V tantalum or 100µF, 10V electrolytic per port
IN
IN
OUTA
OUTB
OUTC
OUTD
GND
GND
33µF*
0.01µF
0.1
µF
33µF*
0.01µF
33µF*
0.01µF
V
BUS
D+
D–
GND
Downstream
USB
Port 1
500mA max.
V
BUS
D+
D–
GND
Downstream
USB
Port 2
500mA max.
V
BUS
D+
D–
GND
Downstream
USB
Port 3
500mA max.
V
BUS
33µF*
0.01µF
D+
D–
GND
Downstream
USB
Port 4
500mA max.
4-Port Self-Powered Hub
UL Recognized Component
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 1999
1
MIC2524/2527
MIC2524/2527
Micrel
Ordering Information
Part Number
MIC2524-1BWM
MIC2524-1BN
MIC2524-2BWM
MIC2524-2BN
MIC2527-1BWM
MIC2527-1BN
MIC2527-2BWM
MIC2527-2BN
On-Resistance
100mΩ typ.
100mΩ typ.
100mΩ typ.
100mΩ typ.
200mΩ typ.
200mΩ typ.
200mΩ typ.
200mΩ typ.
Enable
Active High
Active High
Active Low
Active Low
Active High
Active High
Active Low
Active Low
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
16-Pin SOIC
16-pin DIP
16-Pin SOIC
16-pin DIP
16-Pin SOIC
16-pin DIP
16-Pin SOIC
16-pin DIP
Pin Configuration
FLGA
ENA
OUTA
GND
IN(C/D)
OUTC
ENC
1
2
3
4
5
6
7
16 FLGB
15 ENB
14 OUTB
13 IN(A/B)
12 GND
11 OUTD
10 END
9
FLGD
4 GND 12
ENC 7
FLGC 8
END 10
FLGD 9
LOGIC,
CHARGE
PUMP
3 OUTA
ENA 2
FLGA 1
ENB 15
FLGB 16
LOGIC,
CHARGE
PUMP
13 IN(A/B)
LOGIC,
CHARGE
PUMP
14 OUTB
6 OUTC
5 IN(C/D)
LOGIC,
CHARGE
PUMP
FLGC 8
11 OUTD
16-Pin SOIC (WM)
16-Pin DIP (N)
Functional Pinout
Pin Description
Pin Number
1
2
3
4, 12
5
6
7
8
9
10
11
13
14
15
16
Pin Name
FLGA
ENA
OUTA
GND
IN(C/D)
OUTC
ENC
FLGC
FLGD
END
OUTD
IN(A/B)
OUTB
ENB
FLGB
Pin Function
Flag A: (Output): Channel A open-drain fault flag output.
Enable A (Input): Channel A control input.
Output A: Channel A switch output.
Ground: Supply return. Connect both pins to ground.
Supply Input: Channel C and D switch, logic, and charge-pump supply input.
Output C: Channel C switch output.
Enable C (Input): Channel C control input.
Flag C (Output): Channel C open-drain fault flag output.
Flag D (Output): Channel D open-drain fault flag output.
Enable D (Input): Channel D control input.
Output D: Channel D switch output.
Supply Input: Channel A and B switch, logic, and charge-pump supply input.
Output B: Channel B switch output.
Enable B (Input): Channel B control input.
Flag B (Output): Channel B open-drain fault flag output.
MIC2524/2527
2
June 1999
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°C to +150°C
Lead Temperature (Soldering 5 sec.) ....................... 260°C
ESD Rating,
Note 3
...................................................... 2kV
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 (θ
JA
) ......................................................... 120°C/W
DIP(θ
JA
) ............................................................. 130°C/W
Electrical Characteristics
V
IN
= +5V; T
A
= 25°C; unless noted.
Parameter
Supply Current
Condition
Note 4,
switch off, OUT = open
Note 4,
all switches on, OUT = open
Enable Input Threshold
low-to-high transition
high-to-low transition,
Note 4
Enable Input Current
Enable Input Capacitance
Switch Resistance
MIC2524, I
OUT
= 500mA, each switch
MIC2527, I
OUT
= 500mA, each switch
Output Turn-On Delay
Output Turn-On Rise Time
Output Turnoff Delay
Output Turnoff Fall Time
Output Leakage Current
Continuous Load Current
Short-Circuit Current Limit
Current-Limit Threshold
Overtemperature Shutdown
Threshold
Error Flag Output Resistance
R
L
= 10Ω each output
R
L
= 10Ω each output
R
L
= 10Ω each output
R
L
= 10Ω each output
each output (output disabled)
each output
each output (enable into load), V
OUT
= 4.0V
ramped load applied to enabled output, V
OUT
≤
4.0V,
Note 5
T
J
increasing
T
J
decreasing
V
IN
= 5V, I
L
= 10mA
V
IN
= 3.3V, I
L
= 10mA
Error Flag Off Current
UVLO Threshold
V
FLAG
= 5V
V
IN
= increasing
V
IN
= decreasing
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
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. Human body model, 1.5k in series with 100pF.
Off is
≤
0.8V and on is
≥
2.4V for the MIC252x-1. Off is
≥
2.4V and on is
≤
0.8V for the MIC252x-2. The enable input has approximately 200mV
of hysteresis. See control threshold charts.
See “Functional Characteristics: Current-Limit Response” photo.
Min
Typ
1.5
220
2.1
Max
10
320
2.4
Units
µA
µA
V
V
µA
pF
0.8
–1
1.9
±0.01
1
100
200
0.5
1
1
1
20
20
10
140
300
1
V
EN
= 0V to 5.5V
mΩ
mΩ
ms
ms
µs
µs
µA
A
0.5
0.5
0.75
1.6
135
125
10
15
0.01
2.5
2.3
1
1.25
2.2
A
A
°C
°C
Ω
Ω
µA
V
V
June 1999
3
MIC2524/2527
MIC2524/2527
Micrel
Typical Characteristics
V
IN
= 5V; T
A
= 25°C; one switch section; unless noted.
Output On-Resistance
vs. Supply Voltage
ON-RESISTANCE (mΩ)
110
OUTPUT RESISTANCE (mΩ)
140
Output On-Resistance
vs. Temperature
THRESHOLD VOLTAGE (V)
3.0
UVLO Threshold Voltage
vs. Temperature
120
100
Awaiting Full
Characterization
Data
90
R
L
= 44Ω
T = 25°C
80
3.0
3.5
4.0
4.5
5
SUPPLY VOLTAGE (V)
5.5
2.5
RISING
100
FALLING
2.0
80
R
L
= 44Ω
V
IN
= 5V
60
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
1.5
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
On-State Supply Current
vs. Supply Voltage
500
SUPPLY CURRENT (µA)
400
300
200
100
ALL SWITCHES ON
0
0
2
4
6
SUPPLY VOLTAGE (V)
8
0
2
SUPPLY CURRENT (µA)
2.0
Off-State Supply Current
vs. Supply Voltage
2.5
THRESHOLD VOLTAGE (V)
Control Threshold
vs. Supply Voltage
1.5
2.0
V
CTL
RISING
1.0
1.5
0.5
ALL SWITCHES OFF
3
4
5
6
7
SUPPLY VOLTAGE (V)
8
V
CTL
FALLING
1.0
2
3
4
SUPPLY VOLTAGE (V)
5
On-State Supply Current
vs. Temperature
400
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
350
300
250
200
150
100
50
ALL SWITCHES ON
2.0
Off-State Supply Current
vs. Temperature
2.5
ENABLE VOLTAGE (V)
Control Threshold
vs. Temperature
1.5
2.0
V
EN
FALLING
1.5
V
EN
RISING
1.0
0.5
ALL SWITCHES OFF
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
V
IN
= 5V
1.0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
5
4
3
2
1
Output Rise Time
vs. Temperature
1.0
0.8
Output Fall Time
vs. Temperature
2.0
1.8
Current-Limit Threshold
vs. Temperature
Awaiting Full
Characterization
Data
0.6
0.4
0.2
Awaiting Full
Characterization
Data
CURRENT (A)
TIME (ms)
TIME (µs)
CURRENT LIMIT
THRESHOLD
1.6
1.4
SHORT CIRCUIT
CURRENT LIMIT
1.2
1.0
-25
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0
25
50
75
TEMPERATURE (°C)
100
MIC2524/2527
4
June 1999
MIC2524/2527
Micrel
Functional Characteristics
Input Voltage
Response
Turn-On, Turnoff
Characteristics
2.6V (UVLO) Threshold
V
FLG
V
OUT
I
OUT
(200mA/div.)(5V/div.) (2V/div.)
V
EN
V
OUT
V
FLG
(2V/div.) (5V/div.) (5V/div.)
V
EN
(2V/div.)
I
OUT
(100mA/div.)
V
IN
= 5.0V
R
L
= 35Ω
C
L
= 15µF
144mA
V
IN
= 5.0V
R
L
= 35Ω
C
L
= 10µF
TIME (2.5ms/div.)
TIME (100ns/div.)
Turn-On, Turnoff
Characteristics
V
EN
V
FLG
(5V/div.) (5V/div.)
V
FLG
(5V/div.)
Short Circuit Response
(Short Applied to Output)
V
OUT
(2V/div.)
I
OUT
(100mA/div.)
144mA
R
L
= 35Ω
C
L
= 150µF
TIME (2.5ms/div.)
V
OUT
(2V/div.)
I
OUT
(1A/div.)
1A Short Circuit Current Limit
Thermal Shutdown
TIME (500ms/div.)
Short Circuit Response
Enable into Short Circuit
V
EN
(5V/div.)
V
OUT
I
OUT
(1A/div.) (2V/div.)
V
FLG
(5V/div.)
Thermal
Shutdown
1.1A Short Circuit
Current-Limiting
TIME (250ms/div.)
June 1999
5
MIC2524/2527
嵌入式系统
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