MIC2546(2000) Ver la hoja de datos (PDF) - Micrel

Número de pieza

componentes Descripción

Fabricante

MIC2546
(Rev.:2000)

Dual Programmable Current Limit Switch

Micrel 

MIC2546/2547

Micrel

MIC2546/2547

Dual Programmable Current Limit Switch

Preliminary Information

General Description

The MIC2546 and MIC2547 are integrated high-side dual

power switches optimized for low loss dc power switching and

other power management applications, including Advanced

Configuration and Power Interface (ACPI). The MIC2546/47

is a cost-effective, highly integrated solution that requires few

external components to satisfy USB and ACPI requirements.

Load current management features include a precision resis-

tor-programmable output current-limit and a soft-start circuit

which minimizes inrush current when the switch is enabled.

Thermal shutdown, along with current-limit, protects the

switch and the attached device.

The MIC2546/47’s open-drain flag outputs are used to indi-

cate current-limiting or thermal shutdown to a local controller.

The MIC2547 has an additional internal latch which turns the

output off upon thermal shutdown providing robust fault

control. The enable signal is compatible with both 3V and 5V

logic, and is also used as the thermal shutdown latch reset for

the MIC2547.

The MIC2546 and MIC2547 are available in active-high and

active-low enable versions in 16-pin TSSOP and SOP

packages.

Features

• 2.7V to 5.5V input

• Adjustable current-limit up to 1.5A

• Reverse current flow blocking (no “body diode”)

• 100µA typical on-state supply current per channel

• 2µA typical off-state supply current

• 120mΩ maximum on-resistance

• Open-drain fault flag

• Thermal shutdown

• Thermal shutdown output latch (MIC2547)

• 2ms (slow) turn-on and fast turnoff

• Available with active-high or active-low enable

Applications

• USB power distribution

• PCI Bus Power Switching

• Notebook PC

• ACPI power distribution

• PC card hot swap applications

• Inrush current-limiting

• Ideal for dual supply applications

Typical Application

+5V

RFLGA

RSETA

RFLGB

+3.3V

On/Off

On/Off

MIC2546-xBM

ENA OUTA

FLGA INA

GNDA OUTA

ILIMA NC

ENB OUTB

FLGB INB

GNDB OUTB

ILIMB

NC

RSETB

0.1µF

Peripheral

33µF

Peripheral

33µF

0.1µF

Typical Advanced Configuration and Power Interface (ACPI) Application

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

June 2000

1

MIC2546/2547

Share Link: