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MIC2529

Micrel Semiconductor
Part Number MIC2529
Manufacturer Micrel Semiconductor
Description Single-Channel USB Power Controller Advance Information
Published Mar 26, 2005
Detailed Description MIC2529 Micrel MIC2529 Single-Channel USB Power Controller Advance Information General Description The MIC2529 is a h...
Datasheet PDF File MIC2529 PDF File

MIC2529
MIC2529

Overview
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 VBUS 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 ...


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