MICREL MIC2529-1BM, MIC2529-2BM Datasheet

MIC2529 Micrel

MIC2529

Single-Channel USB Power Controller

Advance Information

General Description

The MIC2529 is a high-side power switch optimized for self­powered (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 high­current loads.

The MIC2529 is available in an 8-pin SOIC package with
active-high or active-low enable circuitry on switch.

Features

• 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
D+
D–

GND

BUS

3.3V USB Controller

V+

OVERCURRENT
D–
D+

1.5k*
5%

1µF

* Speed sense termination resistor. Must be connected

between V

†

33µF tantalum or 100µF electrolytics are recommended.

4.40V to 5.25V

4.7
µF

ON/OFF

GND

Bold lines indicate

0.1" wide, 1-oz. copper
high-current traces.

and D+ to indicate high speed operation.

3VOUT

10k

0.1µF
10k

0.1
µF

MIC2529

83

EN IN

12

FLG OUT

67

3VEN

54

GND

OUT

3VOUT

33µF

33µF

33µF

33µF

Ferrite

Bead

V

BUS

†

0.01µF

†

0.01µF

†

0.01µF

†

0.01µF

D+

D–

GND

V

BUS

D+

D–

GND

V

BUS

D+

D–

GND

V

BUS

D+

D–

GND

Downstream

USB

Port 1

100mA max.

Downstream

USB

Port 2

100mA max.

Downstream

USB

Port 3

100mA max.

Downstream

USB

Port 4

100mA max.

4-Port Ganged Bus-Powered Hub

UL Recognized Component

June 1999 1 MIC2529

MIC2529 Micrel

Ordering Information

Part Number Switch Enable Temperature Range Package

MIC2529-1BM Active High –40°C to +85°C 8-Pin SOIC
MIC2529-2BM Active Low –40°C to +85°C 8-Pin SOIC

Pin Configuration

MIC2529

FLG

1

EN

8

OUT

3VOUT

Pin Description

Pin Number Pin Name Pin Function

1 FLG Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent and

2, 7 OUT Switch Output: Output MOSFET source. Typically connected to switched

3 IN Supply Voltage Input. Supply to switch and regulator. Connect to positive

4 3VOUT 3.3V Regulator Output
5 GND Ground: Supply return.
6 3VEN Regulator Enable (Input): Logic-compatible input. Logic high = enable, logic

8 EN Switch Enable (Input): Logic-compatible enable input. High input = 2.1V

7
6
5

OUT
3VEN
GND

IN

2
3
4

8-Pin SOIC (M)

thermal shutdown switch conditions.

side of load. Pin 2 and 7 must be connected together externally.

supply.

low or open = shutdown. Do not float.

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 (VIN) .....................................................+6V

Fault Flag Voltage (V
Fault Flag Current (I

Switch Output Voltage (OUT)........................................+6V

Switch Output Current (I

)..............................................+6V

FLG

) ............................................50mA

FLG

) ...................Internally Limited

OUT

Operating Ratings (Note 2)

Supply Voltage (VIN) ...................................... +3V to +5.5V

Ambient Temperature (TA).........................–40°C to +85°C

Thermal Resistance

SOIC (θJA).........................................................160°C/W

Switch Control Input (VEN) ........................... –0.3V to +12V

Regulator Control Input (V

).................... –20V to +20V

3VEN

Storage Temperature (TS) ....................... –65°C to +150°C

Lead Temperature (soldering 5 sec.) ........................ 260°C

Electrical Characteristics

VIN = +5V; TA = 25°C; unless noted.

Parameter Condition Min Typ Max Units

Supply Current V

EN Input Threshold low to high transition 2.1 2.4 V

Enable Input Current VEN = 0 - 5.5V 0.01 µA
Enable Input Capacitance 1pF
Switch Resistance V

= high, switch EN off, Note 3 80 150 µA

3VEN

V

= high, switch EN on, OUT = open, Note 3 160 300 µA

3VEN

high to low transition, Note 3 0.8 1.9 V

= 5V; I

IN

= 500mA 120 mΩ

OUT

VIN = 3.3V; I

Output Turn-On Delay RL = 10Ω 0.25 ms
Output Turn-On Rise Time RL = 10Ω 3ms
Output Turnoff Delay RL = 10Ω 120µs
Output Turnoff Fall Time RL = 10Ω 120µs
Output Leakage Current 10 µA
Continuous Load Current FLG not active 0.5 A
Short Circuit Current Limit enabled into load, V
Current-Limit Threshold ramped load applied to enabled output, V
Overtemperature Shutdown T

Threshold TJ decreasing 125 °C
Error Flag Output Resistance VIN = 5V, IL = 10mA 20 Ω

Error-Flag Off Current V
3VEN Input Threshold enable input logic-low voltage (regulator shutdown) 0.4 V

3VEN Input Current VIL ≤ 0.4V 0.01 –1 µA

increasing 135 °C

J

VIN = 3.3V, IL = 10mA 30 Ω

= 5V 0.01 1 µA

FLAG

enable input logic-high voltage (regulator enabled) 2.0 V

VIH ≥ 2.0V 5 20 µA

= 500mA 160 mΩ

OUT

= 0V 0.5 0.75 1.25 A

OUT

= 0V, Note 4 0.95 1.50 A

OUT

June 1999 3 MIC2529

MIC2529 Micrel

Parameter Condition Min Typ Max Units

Regulator Output Voltage VIN = 4.0V to 5.25V, IL = 100mA 3.14 3.3 3.47 V
Regulator Output Voltage Note 5 50 ppm/°C

Temperature Coefficient
Regulator Line Regulation VIN = 4.0V to 5.25V 0.3 mV
Regulator Load Regulation IL = 0.1mA to 100mA 3 mV
Regulator Dropout Voltage IL = 100mA, Note 6 mV
Regulator Current Limit 3V

Note 1. Exceeding the absolute maximum rating may damage the device. Devices are ESD sensitive. Handling precautions recommended.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. 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.

Note 4. See “Functional Characteristics: Current-Limit Response” photo.
Note 5. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 6. 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.

= 0V 320 mA

OUT

Typical Characteristics

Output On-Resistance

vs. Supply Voltage

140

120

100

OUTPUT RESISTANCE (mΩ)

200
180
160
140
120
100

SUPPLY CURRENT (µA)

Awaiting Further

Characterization

Data

RL = 44Ω

T = 25°C

80

3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

On-State Supply Current

vs. Temperature

Awaiting Further

Characterization

80
60
40
20

0

-40 -20 0 20 40 60 80 100

Data

VIN = 5V

TEMPERATURE (°C)

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

Awaiting Further

1.0

0.5

SUPPLY CURRENT (µA)

Characterization

Data

TA = 25°C

0

23456

SUPPLY VOLTAGE (V)

On-State Supply Current

vs. Supply Voltage

200

160

120

Awaiting Further
Characterization

80

40

SUPPLY CURRENT (µA)

0

23456

Data

TA = 25°C

SUPPLY VOLTAGE (V)

Off-State Supply Current

2.0

1.5

vs. Temperature

Awaiting Further

1.0

0.5

SUPPLY CURRENT (µA)

Characterization

Data

VIN = 5V

0

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

MIC2529 4 June 1999