MIC2526
Micrel
MIC2526
Dual USB Power Control Switch
Not Recommended for New Designs
Refer to MIC2026
General Description
The MIC2526 is a dual integrated high-side power switch with
independent enable and flag functions, optimized for self-
powered and bus-powered Universal Serial Bus (USB) appli-
cations. Few external components are necessary to satisfy
USB requirements.
The MIC2526 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 MIC2526 is available in active-high and active-low ver-
sions in 8-pin DIP and SOIC packages.
Features
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Compliant to USB specifications
UL Recognized Component
2 independent switches
3V to 5.5V input
500mA minimum continuous load current per port
140mΩ maximum on-resistance
1.25A maximum short circuit current limit
Individual open-drain fault flag pins
110µA typical 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
8-pin SOIC and DIP packages
USB host and self-powered hubs
USB bus-powered hubs
Hot plug-in power supplies
Battery-charger circuits
Applications
Typical Application
V
CC
5.0V
10k
4.50V to 5.25V
Upstream V
BUS
100mA max.
V
BUS
D+
D–
GND
1µF
10k
MIC5207-3.3
IN
OUT
GND
1µF
3.3V USB Controller
VIN
ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
100k
100k
MIC2526-2
ENA
FLGA
FLGB
ENB
OUTA
IN
GND
OUTB
47µF
Data
Data
(Two Pair)
to USB
Controller
47µF
0.1µF
V
BUS
D+
D–
GND
USB
Port 2
Ferrite
Beads
V
BUS
D+
D–
GND
USB
Port 1
2-Port USB 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
February 2000
1
MIC2526
MIC2526
Micrel
Ordering Information
Part Number
MIC2526-1BM
MIC2526-2BM
MIC2526-1BN
MIC2526-2BN
Enable
Active High
Active Low
Active High
Active Low
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
8-Pin SOIC
8-Pin SOIC
8-pin DIP
8-pin DIP
Pin Configuration
MIC2526
ENA
FLGA
FLGB
ENB
1
2
3
4
8
7
6
5
OUTA
IN
GND
OUTB
8-Pin SOIC (M)
8-Pin DIP (N)
MIC2526
(ENA) 1
(FLGA) 2
(FLGB) 3
(ENB) 4
LOGIC,
CHARGE
PUMP
LOGIC,
CHARGE
PUMP
8 (OUTA)
7 (IN)
5 (OUTB)
6 (GND)
Pin Description
Pin Number
1/4
2/3
6
7
8/5
Pin Name
EN(A/B)
FLG(A/B)
GND
IN
OUT(A/B)
Pin Function
Enable (Input): Logic-compatible enable input. High input > 2.1V typical.
Low input <1.9V typical (-1 active high, -2 active low). Do not float.
Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent,
UVLO, and thermal shutdown.
Ground: Supply return.
Supply Input: Output MOSFET drain. Also supplies IC’s internal circuitry.
Connect to positive supply.
Switch Output: Output MOSFET source. Typically connect to switched side
of load.
MIC2526
2
February 2000
MIC2526
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
V
IN
= 5V, I
OUT
= 500mA, each switch
V
IN
= 3.3V, 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 MIC2526-1. Off is
≥
2.4V and on is
≤
0.8V for the MIC2526-2. The enable input has approximately
200mV of hysteresis. See control threshold charts.
See “Functional Characteristics: Current-Limit Response” photo.
Min
Typ
0.75
110
2.1
Max
5
160
2.4
Units
µA
µA
V
V
µA
pF
0.8
–1
1.9
±0.01
1
100
140
0.5
1
1
1
20
20
10
140
180
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
25
40
1
1.25
2.2
A
A
°C
°C
Ω
Ω
µA
V
V
February 2000
3
MIC2526
MIC2526
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)
250
SUPPLY CURRENT (µA)
200
150
100
50
On-State Supply Current
vs. Supply Voltage
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
SWITCH OFF
0
2
3
4
5
SUPPLY VOLTAGE (V)
6
V
CTL
FALLING
SWITCH ON
0
0
2
4
SUPPLY VOLTAGE (V)
6
1.0
2
3
4
SUPPLY VOLTAGE (V)
5
200
SUPPLY CURRENT (µA)
175
150
125
100
75
50
25
On-State Supply Current
vs. Temperature
SUPPLY CURRENT (µA)
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
BOTH SWITCHES OFF
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
BOTH SWITCHES ON
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
MIC2526
4
February 2000
MIC2526
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
IN
(2V/div.)
I
OUT
(100mA/div.)
V
EN
= V
IN
R
L
= 35Ω
C
L
= 15µF
144mA
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.)
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.)
V
FLG
(5V/div.)
I
OUT
(1A/div.)
Thermal Shutdown
0.95A Short
Circuit Limiting
TIME (250ms/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
0.95A Short
Circuit Limiting
TIME (250ms/div.)
February 2000
5
MIC2526
51单片机
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