A2557SB

Series: -
Input Type: Non-Inverting
Type: Low Side
On-State Resistance: -
Number of Outputs: 4
Mounting Type: Through Hole
Package / Case: 16-DIP (0.300", 7.62mm)
Packaging: Tube
Current - Output / Channel: 300mA
Current - Peak Output: 500mA
Supplier Device Package: 16-DIP
Manufacturer: Allegro Microsystems Inc
Operating Temperature: -20°C ~ 85°C
Voltage - Supply: 4.75 V ~ 5.25 V


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


Pinout




Specifications

Output Voltage, V_O .............................. 60 V
Over-Current Protected Output Voltage,
V_O ........................................................ 32 V
Output Current, I_O ......................... 500 mA*
FAULT Output Voltage, V_FLT ................. 60 V
Logic Supply Voltage, V_CC .................. 7.0 V
Input Voltage, V_I or V_OE ..................... 7.0 V
Package Power Dissipation,
PD .............................................. See Graph
Operating Temperature Range, T_A
Suffix 'S-' ..................... -20°C to +85°C
Suffix 'E-' ..................... -40°C to +85°C
Suffix 'K-' ................... -40°C to +125°C
Junction Temperature,
T_J .................................................. +150°C*
Storage Temperature Range,
T_S .................................. -55°C to +150°C
*Outputs are current limited at approximately 500 mA per driver and junction temperature limited if higher current is attempted.


Description

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. A2557xB, A2557xEB, and A2557xLB 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 A2557xB, A2557xEB, and A2557xLB, the supply current drops to below 100 µA.

Over-current protection for each channel has been designed into A2557xB, A2557xEB, and A2557xLB and is activated at a nominal 500 mA. A2557xB, A2557xEB, and A2557xLB protect 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 of A2557xB, A2557xEB, and A2557xLB 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 of A2557xB, A2557xEB, and A2557xLB 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.