Datasheet > CM3512

CM3512

更新时间： 2024-11-17 22:40:15

品牌	Logo	应用领域
CALMIRCO		开关
页数	文件大小	规格书
11页	139K
描述
Dual USB Overcurrent 1.2A Switches with Independent Controls

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CM3512 数据手册

Preliminary

CM3512

CALIFORNIA MICRO DEVICES

Dual USB Overcurrent 1.2A Switches with Independent Controls

The CM3512 also prevents backdrive current

Features

flowing into the host from the connected peripheral.

•

Dual switches, each with independent over-current

protection and flag indicator, for 4 USB ports

Two active low Enable controls, one per output

Up to 1.2A continuous current each output

Over-current limits at 1.2A min

This can occur when V_CCis removed as the host

powers down, and the peripheral still has normal

power applied. The 5V from the peripheral can

therefore be linked to the host’s V_BUS, potentially

causing backdrive current into the host and

overloading the peripheral power supply.

•

10msec min fault blanking delay on OC# outputs

prevents false overcurrent alarms

•

Prevents backdrive current when host powered off

Low operating current (95µA typ.)

Pin Diagram

GND

V_CC

OC1#

TOP

Low quiescent current when disabled (<1µA max)

V_OUT1

V_OUT2

OC2#

Small 8-Lead SOIC package

SOIC-8

EN1#

Applications

•

PC’s, Notebooks, STBs

EN2#

Product Description

Typical Application Circuit

California Micro Devices CM3512 is a dual channel

USB overcurrent power switch that provides 5V

power to four independent USB ports. The device

has two power switches that provide the V_BUS

voltage at each USB output port with minimal

voltage drop.

GND

V_CC

OC1#

V_OUT1

V_OUT2

OC2#

V_BUS

V_CC

2 USB Ports

When either of the EN# inputs is at logic low, the

corresponding power switch is ON and V_CCis

connected to the corresponding output through the

switch. When either of the EN# inputs is at logic

high, the corresponding power switch is OFF, and

no power is available at the output.

EN1#

EN2#

V_BUS

Both of the power switches have full over-current

protection. Whenever the current limit out of either

switch is exceeded, the device enters a constant-

current mode, and the output voltage is

progressively reduced to prevent the current from

increasing further. Each switch is independent of the

other, so if a switch is on but is not in overcurrent

mode then it will remain switched on. The OC#

output becomes active low only if the overcurrent

condition exceeds a minimum continuous duration of

10ms. This fault blanking delay prevents false

alarms being reported to the host USB controller.

Simplified Electrical Schematic

Charge

Pump

EN1#

OC1#

V_OUT1

Over

current

protect

If the overcurrent condition is severe enough that

the part heats up to the thermal limit T_MAX, then that

switch will be turned off and the device temperature

cools down. At T_MINthe switch then turns on again,

and the device heats up again to T_MAX, and so on,

until the fault is removed.

Charge

Pump

EN2#

V_CC

Over

current

protect

V_OUT2

OC2#

C0970500

11/10/03

430 N. McCarthy Blvd, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

12 3 4 5 6 7...11

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与CM3512相关器件

型号	品牌	获取价格	描述	数据表
CM3512-04SN	CALMIRCO	获取价格	Dual USB Overcurrent 1.2A Switches with Independent Controls
CM3513	CALMIRCO	获取价格	USB 2.4A Overcurrent Switch
CM3513-04SN	CALMIRCO	获取价格	USB 2.4A Overcurrent Switch
CM3518	CML	获取价格	T-1 1/4 Special Midget Flange Base
CM352	CML	获取价格	G-3 1/2 Miniature 2 Pin Base
CM354	CML	获取价格	B-6 Double Contact Bayonet Base
CM35500GKD	CHEMI-CON	获取价格	General Purpose Inductor, 50uH, 1 Element, Amorphous Magnetic-Core
CM356	CML	获取价格	B-6 Double Contact Bayonet Base
CM3582	CML	获取价格	T-1 1/4 Special Midget Flange Base
CM3585	CML	获取价格	T-1 1/4 Special Midget Flange Base

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