©

1999 IMP, Inc.

408-432-9100/www.impweb.com

1

Key Features

Applications

N USB host and self-powered hubs

N USB video monitors

N USB printers

N USB Rev. 1.1 and 2.0 Compliant

N Four independent switches

N 2.7V to 5.5V input operation

N Low MOSFET ON resistance

– IMP2524: 0.1

Ω, 0.14Ω maximum

– IMP2527: 0.2

Ω, 0.3Ω maximum

N 500mA continuos load current per switch

N Low supply current

– 110µA ON-state current, 0.75µA OFF-state

current

N 1.25A maximum current limit, 750mA typical

N Thermal shutdown 2.4V undervoltage lockout

(UVLO)

N Open-drain flag output

– Undervoltage

– Current limit

– Thermal shutdown

N Output can be force higher than input

N Active HIGH(-1) and active LOW(-2) enable

N 16-pin SO and DIP packages, Die available

N Pin compatible with the Micrel MIC2524 and

MIC2527

Typical Application

IMP252

Quad USB High-Side P

er

Switc

ection

The IMP2524 and IMP2527 are complete power management solutions

for bus-powered and self-powered USB hubs. Each device contains four

independent power switches and fault detection logic. The IMP2524

channel resistance is a low 140m

Ω maximum and the IMP2527 channel

resistance is 300

Ω maximum. Both device operate with voltage inputs

from 2.7V to 5.5V

The IMP2524/2527 conform to the new USB 1.1 standard. Fault current

is limited to 750mA typically, and a flag output for each switch conveys

fault information to the local USB controller. The IMP252x “Soft-Start”

function ramps the ON-current to eliminate any excessive voltage drop

on the input side that could occur when capacitive loads are charged.

Self-monitoring features include thermal shutdown to prevent

catastrophic switch failure from high-current loads and undervoltage

lockout (UVLO) that insures that the device remains OFF unless there is

sufficient supply voltage present.

The switch Enable input logic can interface with both 3.3V and 5V logic.

Both active-HIGH (-1 devices) and active-LOW (-2 devices) enable logic

versions are available. Supply current is a low 0.75

µA when disabled and

just 110

µA when enabled

The quad IMP2524/7 devices are available in 16-pin DIP and 16-pin

SO packages and are pin compatible replacements for the Micrel

MIC2524-1/-2 and MIC2527-1/2 devices. IMP offers a complete family

of USB power management products. For single-switch applications see

the IMP2525 and IMP2525A data sheets. The single-switch IMP2525A

features a 0.07

Ω switch resistance. For dual-switch applications, refer to

the IMP2526 data sheet.

Data

Ferrite Bead

2

1

3

4

5

6

7

8

INA/B

INC/D

OUTA

OUTB

OUTC

OUTD

GND

GND

16

15

14

13

12

11

10

9

ENA

FLGA

ENB

FLGB

ENC

FLGC

END

FLGD

IMP2524

IMP2527

USB Controller

V+

D+

D–

ON/OFF

OVERCURRENT

LDO

OUT

IN

GND

GND

27k

1

mF

0.01

mF

0.1

mF

10k

2524/27_01.eps

33

mF*

GND

D–

D+

Downstream

USB

Port 1

500mA max.

+

IMP2527

5.1V

± 3%

5V

± 1%

or

IMP2524

5V

± 3%

0.01

mF

33

mF*

GND

D–

D+

Downstream

USB

Port 2

500mA max.

+

4.7

0.01

mF

33

mF*

GND

D–

D+

Downstream

USB

Port 3

500mA max.

+

0.01

mF

33

mF*

GND

D–

D+

Downstream

USB

Port 4

500mA max.

+

*33

mF, 16V tantalum or 100mF, 10V electrolytic per port