2559 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

2559

Protected Quad Power Driver

Allegro MicroSystems 

2559

Protected Quad Power Driver

Features and Benefits

▪ 700 mA output current per channel

▪ Independent overcurrent protection for each driver

▪ Thermal protection for device and each driver

▪ Low output-saturation voltage

▪ Integral output flyback diodes

▪ TTL and 5 V CMOS-compatible inputs

Packages:

16-pin DIP

with exposed thermal tabs

(B package)

28-pin PLCC

(Package EB)

Not to scale

16-pin SOICW

with internally fused pins

(LB package)

Description

Providing improved output current limiting, the UDK,

UDN, and UDQ2559B, EB, and LB quad power drivers

combine AND logic gates and high-current bipolar outputs

with complete output protection. Each of the four outputs

sink 700 mA in the on state. The outputs have a minimum

breakdown voltage (load dump) of 60 V and a sustaining

voltage of 40 V. The inputs are compatible with TTL and

5 V CMOS logic systems.

Overcurrent protection for each channel has been designed

into these devices and is activated at approximately 1 A. It

protects each output from short circuits with supply voltages

up to 25 V. When an output current trip point is reached, that

output stage is driven linearly resulting in a reduced output

current level. If an over-current or short-circuit condition

continues, the thermal-limiting circuits will first sense the rise

in junction temperature and then the rise in chip temperature,

further decreasing the output current. Under worst-case

conditions, these devices will tolerate short circuits on all

outputs, simultaneously.

These devices can be used to drive various loads including

incandescent lamps (without warming or limiting resistors)

or inductive loads such as relays, solenoids, or dc stepping

motors.

The packages offer fused leads for enhanced thermal dissipation.

Package B is a 16-pin power DIP with exposed tabs, EB is a

28-lead power PLCC, and LB is a 16-lead power wide-body

SOIC for surface-mount applications. The lead (Pb) free

versions have 100% matte tin leadframe plating.

ENABLE

INN

Functional Block Diagram

(1 of 4 Channels)

VCC

K

OUTN

Thermal

Limit

<< 1Ω

29317.14K

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