2557

2557 A2557xLB (SOIC) OUT 1 K OUT 2 GROUND GROUND OUT 3 FAULT OUT 4 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 IN 1 IN 2 ENABLE GROUND GROUND V CC IN 3 IN 4 PROTECTED QUAD LOW-SIDE DRIVER WITH FAULT DETECTION and SLEEP MODE The A2557xB, A2557xEB, and A2557xLB have been specifically designed to provide cost-effective 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. Over-current 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 16-pin power DIP with exposed tabs, EB is 28-lead power PLCCs, and LB are 16-lead power wide-body SOICs for surface-mount applications. The lead (Pb) free versions have 100% matte tin leadframe plating. Data Sheet 29317.16H Dwg. PP-017-4 Note that the A2557xB (DIP) and the A2557xLB (SOIC) are electrically identical and share a common terminal number assignment. ABSOLUTE MAXIMUM RATINGS Output Voltage, VO .............................. 60 V Over-Current Protected Output Voltage, VO ..................................................... 32 V Output Current, IO ......................... 500 mA* FAULT Output Voltage, VFLT ............. 60 V Logic Supply Voltage, VCC ................. 7.0 V Input Voltage, VI or VOE ..................... 7.0 V Package Power Dissipation, PD ........................................... See Graph Operating Temperature Range, TA Suffix ‘S-’ ...................... -20°C to +85°C Suffix ‘E-’ ...................... -40°C to +85°C Suffix ‘K-’ ................... -40°C to +125°C Junction Temperature, TJ ............................................... +150°C* Storage Temperature Range, TS ................................. -55°C to +150°C *Outputs are current limited at approximately 500 mA per driver and junction temperature limited if higher current is attempted. FEATURES ■ 300 mA Output Current per Channel ■ Independent Over-Current Protection &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 2557 PROTECTED QUAD DRIVER WITH FAULT DETECTION & SLEEP MODE Selection Guide Part Number Pb-free Package Ambient Temperature (°C) –20 to 85 –20 to 85 –20 to 85 –20 to 85 –20 to 85 –20 to 85 –40 to 85 –40 to 85 –40 to 85 –40 to 85 –40 to 85 –40 to 85 –40 to 125 –40 to 125 –40 to 125 –40 to 125 –40 to 125 –40 to 125 A2557SB A2557SB-T A2557SEB A2557SEB-T A2557SLB A2557SLB-T A2557EB A2557EB-T A2557EEB A2557EEB-T A2557ELB A2557ELB-T A2557KB A2557KB-T A2557KEB A2557KEB-T A2557KLB A2557KLB-T – Yes – Yes – Yes – Yes – Yes – Yes – Yes – Yes – Yes 16-pin DIP,exposed tabs 16-pin DIP,exposed tabs 28-lead PLCC 28-lead PLCC 16-lead SOIC 16-lead SOIC 16-pin DIP,exposed tabs 16-pin DIP,exposed tabs 28-lead PLCC 28-lead PLCC 16-lead SOIC 16-lead SOIC 16-pin DIP,exposed tabs 16-pin DIP,exposed tabs 28-lead PLCC 28-lead PLCC 16-lead SOIC 16-lead SOIC 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 255 7 PROTECTED QUAD DRIVER WITH FAULT DETECTION & SLEEP MODE FUNCTIONAL BLOCK DIAGRAM FAULT ENABLE SLEEP CONTROL 60 µA K COMMON CONTROL ONE OF FOUR DRIVERS V CC – + 2.5 V OUTN IN N THERMAL LIMIT CURRENT LIMIT 30 µA