MIC2536 Micrel Semiconductor, MIC2536 Datasheet

MIC2536

Manufacturer Part Number

MIC2536

Description

Dual USB Power Distribution Switch Preliminary Information

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2536.pdf (12 pages)

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MIC2536

General Description

The MIC2536 is a cost-effective high-side power switch, with

two independently controlled channels, optimized for bus-

powered Universal Serial Bus (USB) applications. Few exter-

nal components are necessary to satisfy USB requirements.

Each switch channel of the MIC2536 will supply up to 100mA

as required for USB bus-powered downstream devices. Fault

current is limited to typically 275mA by fast-acting current-

limit circuitry which minimizes voltage droop on the upstream

port during fault conditions. A flag output with transient filter

indicates fault conditions to the local USB controller but will

ignore short flag signals resulting from inrush current during

hot plug-in events.

Soft start eliminates the momentary voltage droop on other

ports 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 and 3.3V and 5V logic compatible enable

inputs.

The MIC2536 is available in active-high and active-low ver-

sions in 8-lead SOP and MSOP.

Typical Application

March 2000

4.50V to 5.25V

Upstream V

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

100mA max.

D+

D–

GND

BUS

Data

4.7µF

MIC5207-3.3

1.5k

GND

OUT

1µF

Typical Two-Port Bus-Powered Hub

3.3V USB Controller

VIN

OVERCURRENT

10k

ON/OFF

10k

Features

• Compliant to USB specifications

• 2.7V to 5.5V operating range

• 150mA minimum continuous load current per channel

• 400m typical on-resistance

• Fast-acting short circuit protection with

• Integrated filter eliminates

• Individual open-drain fault flag pins with transient filter

• 3V/5V-compatible enable inputs

• Active-high (-1) and active-low (-2) versions

• Reverse-current blocking in off mode (no “body diode”)

• Soft-start circuit

• 100 A maximum on-state supply current

• <1 A typical off-state supply current

• –40 C to 85 C operation

Applications

• USB keyboard bus-powered hubs

• USB bus-powered docking stations

• Note Book PCs

• PDAs

• General purpose power distribution applications

• PC board hot swap

• Inrush current-limiting

thermal shutdown

false overcurrent flag assertions

ENA

FLGA

FLGB

ENB

Dual USB Power Distribution Switch

MIC2536-2

OUTA

OUTB

GND

Preliminary Information

0.1µF

MIC2536

63µF

(Two Pair)

Controller

to USB

Data

Ferrite

Beads

.01µF

GND

BUS

D+

D–

D+

D–

Port 1

Port 2

USB

MIC2536

Micrel

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