IMP2524-1BN 查看數據表（PDF） - A1 PROs co., Ltd.

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IMP2524-1BN

Quad USB High-Side Power Switch with Fault Detection

A1 PROs co., Ltd. 

IMP2525

POWER MANAGEMENT

USB High-Side Power Switch

– Single switch

– 0.14Ω "ON" resistance at 3V

– MIC2525 pin compatible

The IMP2525 high-side power switch IC is designed for self-powered

and bus-powered Universal Serial Bus (USB) power supply and power

management applications. The IMP2525 conforms to USB standards

with a low output switch ON-resistance (RON) and minimal voltage drop

across the switch. The fault current is limited to 750mA typically, and

a flag output conveys fault conditions to the local USB controller.

The IMP2525 provides a “Soft-Start” function that ramps up the ON-

current to eliminate any excessive voltage drop on the input side that

could occur due to charging a capacitive load in bus-powered applica-

tions. 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 a

valid supply voltage present. The Enable input logic can be interfaced

with both 3.3V and 5V logic. Both active-HIGH and active-LOW enable

logic versions are available. The IMP2525 devices are available in 8-pin

DIP and 8-pin SO packages.

IMP offers a complete family of USB power management products. For

dual-switch applications see the IMP2526 data sheet and for quad-switch

application, see the IMP2524. The single-switch IMP2525A features a

50% lower switch resistance, 0.07Ω.

Block Diagrams

Key Features

N Meets or exceeds USB Rev. 1.1 and 2.0

specification

N Low MOSFET RON (0.14Ω at 3V)

N 2.7V to 5.5V input operation

N Current limiting

N Soft-start turn-on (1ms) prevents turn-on glitches

N 500mA continuous load current

N MOSFET short-circuit current limit (1.25A max)

N Low supply current

– 110µA ON state current, 1µA OFF state current

N Active-LOW or Active-HIGH Enable input

N 3.3V or 5V logic compatibility

N Fault Flag indicates three fault conditions:

– Undervoltage

– Current limit

– Thermal shutdown

N Open-drain Fault Flag output

N 2.4V Undervoltage Lockout (UVLO)

N Pin compatible with the Micrel MIC2525

Applications

N USB power management

N USB hosts and self-powered hubs

N Battery-charger circuits and power supplies

IN 7

EN 1

1.2V

Reference

UVLO

Thermal

Shutdown

Oscillator

Current

Limit

Charge

Pump

Power

Switch

Gate

Control

8

OUT

NC/OUT

6

2

FLG

3

GND

IMP2525

2525_01.eps

© 2000 IMP, Inc.

408-432-9100/www.impweb.com

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