A2557KB Allegro Microsystems Inc, A2557KB Datasheet - Page 2

• Manufacturer Part Number: A2557KB
• Description: IC DRIVER QUAD 60V 300MA 16-DIP
• Manufacturer: Allegro Microsystems Inc
• Type: Low Sider

Specifications of A2557KB

• Input Type: Non-Inverting
• Number Of Outputs: 4
• Current - Output / Channel: 300mA
• Current - Peak Output: 500mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Switch Type: Low Side
• Power Switch Family: A2557
• Input Voltage: 7V
• Output Current: 300mA
• Mounting: Through Hole
• Supply Current: 30mA
• Package Type: PDIP Bat
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Pin Count: 16
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• On-state Resistance: -
• Lead Free Status / Rohs Status: Not Compliant

Features and Benefits
▪ 300 mA output current per channel
▪ Independent overcurrent protection and thermal limiting
▪ 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
Package: 16-pin SOICW with internally
fused pins (LB)
Not to scale
29317.16N
for each driver
ENABLE
IN N
V CC
Functional Block Diagram
ONE OF FOUR DRIVERS
COMMON CONTROL
with Fault Detection and Sleep Mode
CONTROL
SLEEP
THERMAL
LIMIT
Description
The A2557 has been specifically designed to provide cost-
effective solutions to relay-driving applications with up to 300
mA drive current per channel. It 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).
Continued on the next page…
CURRENT
LIMIT
Protected Quad Driver
–
+
<<1
60 A
2.5 V
30 A
FAULT
K
OUT N
A2557