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Precision Adjustable Current -Limited Power Switch

2015-08-0011

PT0497-4

08/31/15

1

PI5PD2556/2557

Features

 Meets USB Current-Limiting Requirement

 ±6.5% Current-Limit Accuracy at 4.0A

 Adjustable Current Limit, 500mA-5A (typ.)

 Fast Over-current Response - 3.5μS (typ.)

 22mΩ High-Side MOSFET

 Operating Range: 2.5 V to 5.5V

 2-μA Maximum Standby Supply Current

 Built-in Soft-Start

 15 kV / 8 kV System-Level ESD Capable

 Device Package: TDFN 3x3-8L

 UL Listed – File No. E341484

 CB Certified

Applications

 USB Ports/Hubs

 Digital TV

 Set-Top Boxes

 VOIP Phones

Pin Configuration

TDFN 2x3-8L (Top View)

Description

The PI5PD2556/2557 series is single-channel power-

distribution switch intended for applications where

precision current limiting is required or heavy capacitive

loads and short circuits are encountered. These devices

offer a programmable current-limit threshold between

500 mA and 5A (typ) per channel via an external resistor.

The power-switch rise and fall times are controlled to

minimize current surges during turn on/off.

Each channel of the PI5PD2556/2557 devices limits the

output current to a safe level by switching into a

constant-current mode when the output load exceeds the

current-limit threshold.

Typical Application Circuit

Pin Description

Pin No.

Pin Name

Type

Description

PI5PD2556

PI5PD2557

1

GND

-

Ground.

2, 3

IN

I

Power input voltage.

4

/EN

EN

I

Enable input, logic low turns on power switch for PI5PD2556, logic high

turns on power switch for PI5PD2557.

5

ILIM

I

External resistor used to set current-limit threshold; recommended 20 kΩ ≤

RILIM ≤ 187 kΩ.

6, 7

OUT

O

Power switch output for channel two

8

/FAULT

O

Active-low open-drain output, asserted during over-current or over-

temperature condition or reverse voltage occurs

IN

2

GND

1

3

4

5

6

7

8

IN

/EN(EN)

OUT

FAULT

OUT

ILIM

TDFN 3x3-8L (Top View)

IN

O UT

G ND

/FAU LT

IL IM

Cin

0. 1uF

Cout

Vout

IN

R1

10 0k

Con trol In put

/FAULT1 Sign al

P ow er Pa d

O UT

Radj

EN

Vout