MIC2526 Micrel
ENA OUTA
FLGA IN
FLGB GND
ENB OUTB
ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
MIC2526-23.3V USB Controller
V
CC
5.0V
0.1µF
V
BUS
D+
D–
GND
Data
(Two Pair)
V
BUS
D+
D–
GND
USB
Port 2
USB
Port 1
10k
100k
MIC5207-3.3
IN OUT
GND
47µF
47µF
Ferrite
Beads
4.50V to 5.25V
Upstream V
BUS
100mA max.
V
BUS
D+
D–
GND
Data
1µF
1µF
10k
100k
VIN
to USB
Controller
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 selfpowered and bus-powered Universal Serial Bus (USB) applications. 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 requirements; and a flag output is available to indicate fault conditions 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 remains 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
• 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
Applications
• USB host and self-powered hubs
• USB bus-powered hubs
• Hot plug-in power supplies
• Battery-charger circuits
Typical Application
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
2-Port USB Self-Powered Hub
February 2000 1 MIC2526
MIC2526 Micrel
Ordering Information
Part Number Enable Temperature Range Package
MIC2526-1BM Active High –40°C to +85°C 8-Pin SOIC
MIC2526-2BM Active Low –40°C to +85°C 8-Pin SOIC
MIC2526-1BN Active High –40°C to +85°C 8-pin DIP
MIC2526-2BN Active Low –40°C to +85°C 8-pin DIP
Pin Configuration
MIC2526
ENA
1
8
OUTA
FLGA
FLGB
ENB
(ENA) 1
(FLGA) 2
(FLGB) 3
(ENB) 4
Pin Description
Pin Number Pin Name Pin Function
1 / 4 EN(A/B) Enable (Input): Logic-compatible enable input. High input > 2.1V typical.
2 / 3 FLG(A/B) Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent,
6 GND Ground: Supply return.
7 IN Supply Input: Output MOSFET drain. Also supplies IC’s internal circuitry.
8 / 5 OUT(A/B) Switch Output: Output MOSFET source. Typically connect to switched side
2
3
4
7
6
5
IN
GND
OUTB
8-Pin SOIC (M)
8-Pin DIP (N)
MIC2526
LOGIC,
CHARGE
PUMP
LOGIC,
CHARGE
PUMP
6 (GND)
Low input <1.9V typical (-1 active high, -2 active low). Do not float.
UVLO, and thermal shutdown.
Connect to positive supply.
of load.
8 (OUTA)
7 (IN)
5 (OUTB)
MIC2526 2 February 2000
MIC2526 Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
Fault Flag Voltage (V
Fault Flag Current (I
Output Voltage (V
Output Current (I
Control Input (V
) .....................................................+6V
IN
)..............................................+6V
FLG
) ............................................50mA
FLG
) ..................................................+6V
OUT
)...............................Internally Limited
OUT
)......................................... –0.3V to 12V
EN
Operating Ratings (Note 2)
Supply Voltage (V
Ambient Operating Temperature (T
Thermal Resistance
SOIC (θ
).........................................................120°C/W
JA
DIP(θJA).............................................................130°C/W
) ...................................... +3V to +5.5V
IN
) ........ –40°C to +85°C
A
Storage Temperature (TS) ....................... –65°C to +150°C
Lead Temperature (Soldering 5 sec.) ....................... 260°C
ESD Rating, Note 3 ......................................................2kV
Electrical Characteristics
VIN = +5V; TA = 25°C; unless noted.
Parameter Condition Min Typ Max Units
Supply Current Note 4, switch off, OUT = open 0.75 5 µA
Note 4, all switches on, OUT = open 110 160 µA
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 VEN = 0V to 5.5V –1 ±0.01 1 µA
Enable Input Capacitance 1pF
Switch Resistance VIN = 5V, I
VIN = 3.3V, I
Output Turn-On Delay RL = 10Ω each output 0.5 ms
Output Turn-On Rise Time RL = 10Ω each output 1 ms
Output Turnoff Delay RL = 10Ω each output 1 20 µs
Output Turnoff Fall Time RL = 10Ω each output 1 20 µs
Output Leakage Current each output (output disabled) 10 µA
Continuous Load Current each output 0.5 A
Short-Circuit Current Limit each output (enable into load), V
Current-Limit Threshold ramped load applied to enabled output, V
Overtemperature Shutdown TJ increasing 135 °C
Threshold
Error Flag Output Resistance VIN = 5V, IL = 10mA 10 25 Ω
Error Flag Off Current V
UVLO Threshold VIN = increasing 2.5 V
TJ decreasing 125 °C
VIN = 3.3V, IL = 10mA 15 40 Ω
= 5V 0.01 1 µA
FLAG
VIN = decreasing 2.3 V
= 500mA, each switch 100 140 mΩ
OUT
= 500mA, each switch 140 180 mΩ
OUT
= 4.0V 0.5 0.75 1.25 A
OUT
≤ 4.0V, Note 5 1.6 2.2 A
OUT
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 ≥ 2.4V for the MIC2526-1. Off is ≥ 2.4V and on is ≤ 0.8V for the MIC2526-2. The enable input has approximately
Note 5. See “Functional Characteristics: Current-Limit Response” photo.
200mV of hysteresis. See control threshold charts.
February 2000 3 MIC2526
MIC2526 Micrel
Typical Characteristics
VIN = 5V; TA = 25°C; one switch section; unless noted.
Output On-Resistance
vs. Supply Voltage
110
100
90
OUTPUT RESISTANCE (mΩ)
80
3.0 3.5 4.0 4.5 5 5.5
Awaiting Full
Characterization
Data
RL = 44Ω
T = 25°C
SUPPLY VOLTAGE (V)
On-State Supply Current
vs. Supply Voltage
250
200
150
100
50
SUPPLY CURRENT (µA)
0
0246
SWITCH ON
SUPPLY VOLTAGE (V)
Output On-Resistance
140
120
100
ON-RESISTANCE (mΩ)
vs. Temperature
80
60
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
RL = 44Ω
VIN = 5V
Off-State Supply Current
vs. Supply Voltage
2.0
1.5
1.0
0.5
SUPPLY CURRENT (µA)
0
SWITCH OFF
23456
SUPPLY VOLTAGE (V)
UVLO Threshold Voltage
3.0
2.5
2.0
THRESHOLD VOLTAGE (V)
1.5
vs. Temperature
RISING
FALLING
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Control Threshold
vs. Supply Voltage
2.5
2.0
1.5
THRESHOLD VOLTAGE (V)
1.0
2345
V
RISING
CTL
V
FALLING
CTL
SUPPLY VOLTAGE (V)
On-State Supply Current
200
175
150
125
100
SUPPLY CURRENT (µA)
vs. Temperature
75
50
25
0
BOTH SWITCHES ON
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Output Rise Time
vs. Temperature
5
4
3
2
TIME (µs)
1
0
-40 -20 0 20 40 60 80 100
Awaiting Full
Characterization
Data
TEMPERATURE (°C)
Off-State Supply Current
2.0
1.5
1.0
0.5
SUPPLY CURRENT (µA)
vs. Temperature
BOTH SWITCHES OFF
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Output Fall Time
1.0
0.8
0.6
0.4
TIME (ms)
0.2
vs. Temperature
Awaiting Full
Characterization
Data
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Control Threshold
2.5
2.0
1.5
ENABLE VOLTAGE (V)
1.0
vs. Temperature
VEN RISING
VEN FALLING
VIN = 5V
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Current-Limit Threshold
2.0
1.8
1.6
1.4
CURRENT (A)
1.2
1.0
vs. Temperature
CURRENT LIMIT
THRESHOLD
SHORT CIRCUIT
CURRENT LIMIT
-25 0 25 50 75 100
TEMPERATURE (°C)
MIC2526 4 February 2000