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High-Performance Power ICs and Hall-Effect Sensors
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A2557: Protected Quad Driver with Fault Detection and Sleep Mode (PDF)
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Power Integrated Circuits,
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Relay/Solenoid Drivers
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A2557
Protected Quad Driver with Fault Detection and Sleep Mode
Features
- 300 mA output current per channel
- Independent overcurrent protection and thermal limiting for each driver
- Output voltage to 60 V
- Output SOA protection
- Fault-detection circuitry for open or shorted load
- Low quiescent current Sleep Mode
- Integral output flyback/clamp diodes
- TTL- and 5 V CMOS-compatible inputs
Description
The A2557 has been specifically designed to provide costeffective solutions to relay-driving applications with up to 300 mA drive current per channel. They may also be used for driving incandescent lamps in applications where turn-on time is not a concern. Each of the four outputs will sink 300 mA in the on state. The outputs have a minimum breakdown voltage of 60 V and a sustaining voltage of 40 V. A low-power Sleep Mode is activated with either ENABLE low or all inputs low. In this mode, the supply current drops to below 100 µA.
Overcurrent protection for each channel has been designed into these devices and is activated at a nominal 500 mA. It protects each output from short circuits with supply voltages up to 32 V. When an output experiences a short circuit, the output current is limited at the 500 mA current clamp. In addition, foldback circuitry decreases the current limit if an excessive voltage is present across the output and assists in keeping the device within its SOA (safe operating area). An exclusive-OR circuit compares the input and output state of each driver. If either a short or open load condition is detected, a single FAULT output is turned on (active low).
Continuous or multiple overload conditions causing the channel temperature to reach approximately 165°C will result in an additional linear decrease in the output current of the affected driver. If the fault condition is corrected, the output stage will return to its normal saturated condition.
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.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A2557SB-T | 16-pin DIP | Yes | view data | -20 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557SEB-T | 28-lead PLCC | Yes | view data | -20 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557SEBTR | 28-lead PLCC | No | view data | -20 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557SEBTR-T | 28-lead PLCC | Yes | view data | -20 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557SLB | 16-lead SOIC | No | view data | -20 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557SLB-T | 16-lead SOIC | Yes | view data | -20 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557SLBTR | 16-lead SOIC | No | view data | -20 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557SLBTR-T | 16-lead SOIC | Yes | view data | -20 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557EB | 16-pin DIP | No | view data | -40 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557EB-T | 16-pin DIP | Yes | view data | -40 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557EEB | 28-lead PLCC | No | view data | -40 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557EEB-T | 28-lead PLCC | Yes | view data | -40 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557EEBTR | 28-lead PLCC | No | view data | -40 °C to 85 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557EEBTR-T | 28-lead PLCC | Yes | view data | -40 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557ELB-T | 16-lead SOIC | Yes | view data | -40 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557ELBTR-T | 16-lead SOIC | Yes | view data | -40 °C to 85 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557KB | 16-pin DIP | No | view data | -40 °C to 125 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557KB-T | 16-pin DIP | Yes | view data | -40 °C to 125 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557KEB-T | 28-lead PLCC | Yes | view data | -40 °C to 125 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557KEBTR | 28-lead PLCC | No | view data | -40 °C to 125 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557KEBTR-T | 28-lead PLCC | Yes | view data | -40 °C to 125 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557KLB | 16-lead SOIC | No | view data | -40 °C to 125 °C | discontinued | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A2557KLB-T | 16-lead SOIC | Yes | view data | -40 °C to 125 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557KLBTR | 16-lead SOIC | No | view data | -40 °C to 125 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | ||
| A2557KLBTR-T | 16-lead SOIC | Yes | view data | -40 °C to 125 °C | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. |
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.