A3953SLB Allegro Microsystems Inc, A3953SLB Datasheet - Page 2

• Manufacturer Part Number: A3953SLB
• Description: IC MOTOR DRIVER PWM FULL 16-SOIC
• Manufacturer: Allegro Microsystems Inc

Specifications of A3953SLB

• Applications: PWM Motor Driver
• Number Of Outputs: 1
• Current - Output: ±1.3A
• Voltage - Load: 3 V ~ 50 V
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Package B, 16-pin DIP
with exposed tabs
Features and Benefits
▪ ±1.3 A continuous output current
▪ 50 V output voltage rating
▪ 3 V to 5.5 V logic supply voltage
▪ Internal PWM current control
▪ Saturated sink drivers (below 1 A)
▪ Fast and slow current-decay modes
▪ Automotive capable
▪ Sleep (low current consumption) mode
▪ Internal transient-suppression diodes
▪ Internal thermal shutdown circuitry
▪ Crossover current and UVLO protection
Packages:
29319.8I
GROUND
SUPPLY
ENABLE
PHASE
BRAKE
LOGIC
MODE
Not to scale
14
7
8
1
4
5
6
V
CC
Package LB, 16-pin SOIC
with internally fused pins
SLEEP &
STANDBY MODES
Functional Block Diagram
V
CC
& TSD
UVLO
BLANKING
Full-Bridge PWM Motor Driver
PWM LATCH
R T
Description
Designed for bidirectional pulse width modulated (PWM)
current control of inductive loads, the A3953 is capable of
continuous output currents to ±1.3 A and operating voltages
to 50 V. Internal fixed off-time PWM current-control circuitry
can be used to regulate the maximum load current to a desired
value. The peak load current limit is set by the user’s selection
of an input reference voltage and external sensing resistor. The
fixed off-time pulse duration is set by a user- selected external
RC timing network. Internal circuit protection includes thermal
shutdown with hysteresis, transient-suppression diodes, and
crossover current protection. Special power-up sequencing is
not required.
With the ENABLE input held low, the PHASE input controls
load current polarity by selecting the appropriate source and
sink driver pair. The MODE input determines whether the
PWM current-control circuitry operates in a slow current-decay
mode (only the selected source driver switching) or in a fast
current-decay mode (selected source and sink switching). A
user-selectable blanking window prevents false triggering of
the PWM current-control circuitry. With the ENABLE input
held high, all output drivers are disabled. A sleep mode is
provided to reduce power consumption.
Continued on the next page…
Q
R
S
RC
3
C T
9
+ –
V TH
+
–
10
V
BB
REF
2
15
16
SENSE
GROUND
12
13
11
Dwg. FP-036-2A
R S
A3953