MIC2529
Micrel
MIC2529
Single-Channel USB Power Controller
Advance Information
General Description
The MIC2529 is a high-side power switch optimized for self-
powered (individual port switching) and bus-powered (ganged
port switching) Universal Serial Bus (USB) hub applications.
An on-board voltage regulator provides the 3.3V supply
voltage needed for many USB microcontrollers reducing
board component count.
The MIC2529 satisfies the following USB requirements: it
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 requirement; 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.
A low-dropout (LDO) regulator provides 3.3V at loads up to
100mA and includes an enable pin for low current shutdown.
Both enable inputs are compatible with 3.3V and 5V logic.
Thermal shutdown prevents catastrophic failure from high-
current loads.
The MIC2529 is available in an 8-pin SOIC package with
active-high or active-low enable circuitry on switch.
Features
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Compliant to USB specifications
UL Recognized Component
On-board 3.3V, 100mA low-dropout regulator
500mA minimum continuous switch load current
160mΩ maximum on-resistance
750mA typical current limit
Open-drain fault flag pin for switch
Output can be forced higher than input (off-state)
Thermal shutdown
1ms turn-on (soft-start) and fast turnoff
Available with active-high or active-low switch enable
Active-high enable on 3.3V regulated output
8-pin SOIC package
Applications
• USB self-powered hubs
• USB bus-powered hubs
• USB keyboard hubs
Typical Applications
Upstream V
BUS
D+
D–
GND
3.3V USB Controller
V+
ON/OFF
8
4.40V to 5.25V
4.7
µF
0.1
µF
MIC2529
10k
0.1µF
10k
EN
FLG
3VEN
GND
IN
OUT
OUT
3VOUT
3
2
7
4
1
6
5
Ferrite
Bead
V
BUS
33µF
†
0.01µF
D+
D–
GND
Downstream
USB
Port 1
100mA max.
OVERCURRENT
D–
D+
1.5k*
5%
1µF
GND
V
BUS
33µF
†
0.01µF
D+
D–
GND
Downstream
USB
Port 2
100mA max.
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
V
BUS
33µF
†
0.01µF
D+
D–
GND
Downstream
USB
Port 3
100mA max.
* Speed sense termination resistor. Must be connected
between V
3VOUT
and D+ to indicate high speed operation.
†
V
BUS
33µF
†
0.01µF
D+
D–
GND
Downstream
USB
Port 4
100mA max.
33µF tantalum or 100µF electrolytics are recommended.
4-Port Ganged Bus-Powered Hub
UL Recognized Component
June 1999
1
MIC2529
MIC2529
Micrel
Ordering Information
Part Number
MIC2529-1BM
MIC2529-2BM
Switch Enable
Active High
Active Low
Temperature Range
–40°C to +85°C
–40°C to +85°C
Package
8-Pin SOIC
8-Pin SOIC
Pin Configuration
MIC2529
FLG 1
OUT 2
IN 3
3VOUT 4
8 EN
7 OUT
6 3VEN
5 GND
8-Pin SOIC (M)
Pin Description
Pin Number
1
2, 7
3
4
5
6
8
Pin Name
FLG
OUT
IN
3VOUT
GND
3VEN
EN
Pin Function
Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent and
thermal shutdown switch conditions.
Switch Output: Output MOSFET source. Typically connected to switched
side of load. Pin 2 and 7 must be connected together externally.
Supply Voltage Input. Supply to switch and regulator. Connect to positive
supply.
3.3V Regulator Output
Ground: Supply return.
Regulator Enable (Input): Logic-compatible input. Logic high = enable, logic
low or open = shutdown. Do not float.
Switch 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.
MIC2529
2
June 1999
MIC2529
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
) ..................................................... +6V
Fault Flag Voltage (V
FLG
) .............................................. +6V
Fault Flag Current (I
FLG
) ............................................ 50mA
Switch Output Voltage (OUT) ........................................ +6V
Switch Output Current (I
OUT
) ................... Internally Limited
Switch Control Input (V
EN
) ........................... –0.3V to +12V
Regulator Control Input (V
3VEN
) .................... –20V to +20V
Storage Temperature (T
S
) ....................... –65°C to +150°C
Lead Temperature (soldering 5 sec.) ........................ 260°C
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) ...................................... +3V to +5.5V
Ambient Temperature (T
A
) ......................... –40°C to +85°C
Thermal Resistance
SOIC (θ
JA
) ......................................................... 160°C/W
Electrical Characteristics
V
IN
= +5V; T
A
= 25°C; unless noted.
Parameter
Supply Current
Condition
V
3VEN
= high, switch EN off,
Note 3
V
3VEN
= high, switch EN on, OUT = open,
Note 3
EN Input Threshold
Enable Input Current
Enable Input Capacitance
Switch Resistance
V
IN
= 5V; I
OUT
= 500mA
V
IN
= 3.3V; I
OUT
= 500mA
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
FLG not active
enabled into load, V
OUT
= 0V
ramped load applied to enabled output, V
OUT
= 0V,
Note 4
T
J
increasing
T
J
decreasing
V
IN
= 5V, I
L
= 10mA
V
IN
= 3.3V, I
L
= 10mA
Error-Flag Off Current
3VEN Input Threshold
V
FLAG
= 5V
enable input logic-low voltage (regulator shutdown)
enable input logic-high voltage (regulator enabled)
3VEN Input Current
V
IL
≤
0.4V
V
IH
≥
2.0V
2.0
0.01
5
–1
20
0.5
0.5
0.75
0.95
135
125
20
30
0.01
1
0.4
1.25
1.50
R
L
= 10Ω
R
L
= 10Ω
R
L
= 10Ω
R
L
= 10Ω
low to high transition
high to low transition,
Note 3
V
EN
= 0 - 5.5V
Min
Typ
80
160
2.1
1.9
0.01
1
120
160
0.25
3
1
1
20
20
10
Max
150
300
2.4
Units
µA
µA
V
V
µA
pF
mΩ
mΩ
ms
ms
µs
µs
µA
A
A
A
°C
°C
Ω
Ω
µA
V
V
µA
µA
0.8
June 1999
3
MIC2529
MIC2529
Parameter
Regulator Output Voltage
Regulator Output Voltage
Temperature Coefficient
Regulator Line Regulation
Regulator Load Regulation
Regulator Dropout Voltage
Regulator Current Limit
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Micrel
Condition
V
IN
= 4.0V to 5.25V, I
L
= 100mA
Note 5
V
IN
= 4.0V to 5.25V
I
L
= 0.1mA to 100mA
I
L
= 100mA,
Note 6
3V
OUT
= 0V
320
Min
3.14
Typ
3.3
50
0.3
3
Max
3.47
Units
V
ppm/°C
mV
mV
mV
mA
Exceeding the absolute maximum rating may damage the device. Devices are ESD sensitive. Handling precautions recommended.
The device is not guaranteed to function outside its operating rating.
Off is
≤
0.8V and on is
≥
2.4V for the MIC2529-1 switch. Off is
≥
2.4V and on is
≤
0.8V for the MIC2529-2 switch. The enable input has
approximately 200mV of hysteresis. See control threshold charts. Limits do not include 3VOUT load current of 100µA during test.
See “Functional Characteristics: Current-Limit Response” photo.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential.
Typical Characteristics
Output On-Resistance
vs. Supply Voltage
ON-RESISTANCE (mΩ)
140
OUTPUT RESISTANCE (mΩ)
140
Output On-Resistance
vs. Temperature
SUPPLY CURRENT (µA)
On-State Supply Current
vs. Supply Voltage
200
160
120
80
40
T
A
= 25°C
0
2
3
4
5
SUPPLY VOLTAGE (V)
6
120
120
Awaiting Further
Characterization
Data
100
R
L
= 44Ω
T = 25°C
80
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
5.5
100
Awaiting Further
Characterization
Data
80
R
L
= 44Ω
V
IN
= 5V
60
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
On-State Supply Current
vs. Temperature
200
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
2.0
Off-State Supply Current
vs. Supply Voltage
SUPPLY CURRENT (µA)
2.0
Off-State Supply Current
vs. Temperature
180
160
140
120
100
80
60
40
V
IN
= 5V
20
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
1.5
1.5
Awaiting Further
Characterization
Data
1.0
Awaiting Further
Characterization
Data
1.0
Awaiting Further
Characterization
Data
0.5
T
A
= 25°C
0
2
3
4
5
SUPPLY VOLTAGE (V)
6
0.5
V
IN
= 5V
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
MIC2529
4
June 1999
MIC2529
Micrel
SWITCH ENABLE VOLTAGE (V)
SWITCH ENABLE VOLTAGE (V)
2.5
Switch Enable Threshold
vs. Supply Voltage
2.5
Switch Enable Threshold
vs. Temperature
5
4
TIME (ms)
3
2
1
Output Rise Time
vs. Temperature
V
EN
RISING
2.0
V
EN
FALLING
1.5
2.0
V
EN
FALLING
1.5
V
EN
RISING
Awaiting Further
Characterization
Data
1.0
3.0
T
A
= 25°C
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
5.5
1.0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
V
IN
= 5V
V
IN
= 5V
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
50
40
TIME (µs)
30
20
10
Output Fall Time
vs. Temperature
SWITCH OUTPUT (A)
3
Threshold Trip Current
vs. Supply Voltage
SWITCH OUTPUT (A)
3
Short Circuit Output Current
vs. Temperature
2
Awaiting Further
Characterization
Data
Awaiting Further
Characterization
Data
1
2
Awaiting Further
Characterization
Data
1
V
IN
= 5V
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0
0
T
A
= 25°C
1
2
3
4
SUPPLY VOLTAGE (V)
5
V
IN
= 5V
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
3.0
THRESHOLD VOLTAGE (V)
UVLO Threshold Voltage
vs. Temperature
DROPOUT VOLTAGE (V)
1000
Regulator Dropout Voltage
vs. Output Current
400
DROPOUT VOLTAGE (V)
350
300
250
200
150
100
50
Regulator Dropout Voltage
vs. Temperature
2.5
RISING
100
FALLING
2.0
Awaiting Further
Characterization
Data
10
Awaiting Further
Characterization
Data
1.5
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
1
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
June 1999
5
MIC2529
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