Single 1.2A USB Switch in

3mm x 3mm TDFN

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7

Pin Description

PIN

NAME

FUNCTION

1

SEL

ON Polarity Selector Input. Drive SEL high to select ON for an active-high enable. Drive SEL to GND to select

ON for an active-low enable.

2

ISET

Current-Limit Programming Input. Connect a resistor from ISET to GND to set the internal current limit. The

Ω to 60kΩ.

3ON

Enable Input. Drive ON high to enable the device when SEL is high. Drive ON low to enable the device when

SEL is low.

4IN

Power-Supply Input. Connect to an input power supply in the 2.75V to 5.5V range. Bypass IN to GND with a

1µF or greater ceramic capacitor.

5

OUT

Power Output. Bypass OUT to GND with a 1µF or greater capacitor. OUT is high impedance during

shutdown.

6

FAULT

Open-Drain Fault-Indicator Output. FAULT is low when the input is below UVLO, or during current limit,

reverse current detection, or thermal shutdown.

7

GND

Ground. Connect GND to the exposed paddle and to a ground plane.

8

ENRESET

Auto-Restart Enable Input. Drive ENRESET high to enable auto-restart mode. Drive ENRESET low to disable

auto-restart mode.

—

EP

Exposed Pad. Connect the exposed pad to a large ground plane to improve thermal power dissipation.

Functional Diagram

CURRENT-

LIMIT

CIRCUITRY

CONTROL

LOGIC

MAX8586

O.5V

FAULT

ENRESET

ISET

OUT

N

25mA

SEL

IN

ON

GND

CHARGE

PUMP

OSCILLATOR

AUTO-

RESTART

CIRCUITRY

THERMAL-

SHUTDOWN

CIRCUITRY

+

-

20ms

TIMER

UVLO