33289 Ver la hoja de datos (PDF) - Motorola => Freescale

Número de pieza

componentes Descripción

Fabricante

33289

Dual High-Side Switch

Motorola => Freescale 

Freescale Semiconductor, Inc.

DEVICE DESCRIPTION

INTRODUCTION

The 33289 is a dual high-side switch with appropriate

control, protection, and diagnostic features dedicated to drive

inductive loads such as solenoid drivers for automotive and

industrial applications. The device consists of two independent

applications with two independent 40 mΩ power switches. It

can be linked directly with a microcontroller. It is available in a

SOICW 20 surface mount package.

Power Supply

The 33289 can be directly connected to the supply line. In

Standby mode (in-1 and in-2 at 0V), the supply current is less

than 5.0 µA for VBAT supply voltage below 14 V. This feature

allows a very low supply current on the battery, for example,

when an auto is idle or parked. During OFF state, the status

pins are in high impedance. In case of loss of (digital) ground,

the power MOSFETs turn OFF in order to safely tie the load

current to zero.

Nominal Voltage and Transient Operation

The nominal operation voltage is from 6.0 to 26 V. The 33289

device is functional over a larger voltage range from 6.0 V to

27V. The technology used for both power and analog circuitry

sustains 40 V DC voltage.

Power Output Switches

The device has two independent high-side switches. Each

switch is realized with an N-channel power MOSFET and

includes current and temperature sensing circuitries. The

MOSFET gates are driven by analog circuitry which includes

charge pump and fault detection.

Each output has a 40 mΩ RDSON maximum 25°C. The RDSON

value reaches 75 mΩ at 150°C junction temperature. Each

output has a parasitic drain to source diode, inherent to any

vertical MOSFET. This diode can sustain as much current at the

MOSFET. The diode is reversed biased during normal

operation of the MOSFET and is forward biased during reverse

battery, or negative transient pulses.

Status

The device has an independent status pin per output,

reporting an overtemperature, overcurrent, and an open load

condition in the device. This pin is an open drain structure,

requiring an external pull-up resistor. The device incorporates

overtemperature sense on each output MOSFET in order to

independently protect each output.

Open Load Function

The open load detection is active during the OFF phase, or

cold open load detection. An amplifier measures the differential

voltage between VBAT and VOUT.

When the load current is below 400 mA, the open load

circuitry will pull down the status output. The open load circuitry

can be disabled with the OLDE to ensure very low standby

current.

Package

The device is assembled into a surface mount package.

33289

8

For More Information OMnOTTOhRiOsLPA rAoNdAuLOcGt,INTEGRATED CIRCUIT DEVICE DATA

Go to: www.freescale.com

Share Link: