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Related Links:

Datasheets:
A2550: Relay Driver with 5 V Regulator for Automotive Applications (PDF)

Selection Guides:
Power Integrated Circuits,

Automotive ICs

when this product is updated

Press Releases:
A2550: Allegro Microsystems, Inc. Adds New Automotive Grade Relay Driver To Their Existing Portfolio

A2550
Relay Driver with 5 V Regulator for Automotive Applications

• Three independent low-side DMOS output drivers
• Short-circuit protection of drivers
• Eliminates need for flyback diodes on relays
• Thermal shutdown
• Separate precision 5 V regulator (2%)
• Current clamp on 5 V regulator
• 16-pin TSSOP package with exposed thermal pad
• Programmable reset (NPOR) delay time
• Programmable watchdog
• Automotive voltage and temperature ranges
• Active clamps for automotive load dump specifications
• Lead (Pb) free

Description

Large numbers of relay-based applications require the use of a microprocessor which implements complex system control. In these systems, there is the need for microprocessor logic supply voltage, power-on reset circuitry, and watchdog capabilities. The Allegro® A2550 combines the functions of voltage regulator, watchdog, and reset, as well as three low-side DMOS relay driver outputs. Primarily targeted at automotive applications, this IC is designed to provide robust performance over extended voltage and temperature ranges.

Three low-side DMOS drivers can drive inductive loads, such as relay coils. Each driver integrates rugged voltage clamps which survive automotive load dump pulses up to 48 V. The 40 V rating on VBB also ensures adequate survival in harsh automotive environments.

A 5 V linear regulator provides 40 mA of output current, with a tolerance of 2% over the operating temperature range. To enhance the usefulness of the IC in automotive applications, the 5 V regulator output, as well as the three low-side driver outputs are protected against overcurrent conditions.

The A2550 also includes power-on reset circuitry (NPOR) as well as an integrated watchdog circuit. Combined, they service the monitoring and reset requirements of a system microprocessor.

The A2550 is supplied in a 16-pin TSSOP package with exposed thermal pad (package LP).The package is lead (Pb) free, with 100% matte tin leadframe plating.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A2550KLP-T	16-lead TSSOP	Yes	view data	-40 °C to  125 °C	new
A2550KLPTR-T	16-lead TSSOP	Yes	view data	-40 °C to  125 °C	new	samples not available

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.