A3948SLB Allegro Microsystems Inc, A3948SLB Datasheet - Page 2

• Manufacturer Part Number: A3948SLB
• Description: IC MOTOR DRIVER PWM FULL 24-SOIC
• Manufacturer: Allegro Microsystems Inc

Specifications of A3948SLB

• Applications: PWM Motor Driver
• Number Of Outputs: 1
• Current - Output: ±1.5A
• Voltage - Load: 20 V ~ 50 V
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Operating Current: 10mA
• Operating Temperature Classification: Commercial
• Package Type: SOIC W
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LOGIC SUPPLY
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any
set of conditions, do not exceed the specified
current rating or a junction temperature of 150 C.
* Per SEMI G42-88 Specification.
Note that the A3948SLB(SOIC) and A3948SB
(DIP) do not share a common terminal
assignment.
GROUND
GROUND
STROBE
ENABLE
PHASE
CLOCK
DATA
OSC
CP
CP
CP
2
1
12
10
11
8
9
1
2
3
4
5
6
7
9
V
DD
V
NC
BB
NC
19
24
20
18
13
23
22
21
17
16
15
14
V
RANGE
NO
CONNECTION
OUT
LOAD SUPPLY
GROUND
SENSE
NO
CONNECTION
MODE
REF
GROUND
OUT
REG
B
A
Dwg. PP-069A
3948
motors, the A3948SB and A3948SLB are capable of continuous output
currents to 1.5 A and operating voltages to 50 V. Internal fixed off-
time PWM current-control timing circuitry can be programmed via a
serial interface to operate in slow, fast, and mixed current-decay
modes. Similar devices with outputs rated to 2 A are available as the
A3958SB/SLB.
controlling the speed and direction of a dc motor with externally
applied PWM-control signals. The ENABLE input can be
programmed via the serial port to PWM the bridge in fast or slow
current decay. Internal synchronous rectification control circuitry is
provided to reduce power dissipation during PWM operation.
hysteresis, and crossover-current protection. Special power-up
sequencing is not required.
packages, a 24-pin plastic DIP with a copper batwing tab (package
suffix ‘B’), and a 24-lead plastic SOIC with a copper batwing tab
(package suffix ‘LB’). In both cases, the power tab is at ground
potential and needs no electrical isolation.
Always order by complete part number:
Low
Programmable Mixed, Fast, and Slow Current-Decay Modes
Serial Interface Controls Chip Functions
Synchronous Rectification for Low Power Dissipation
Internal UVLO and Thermal-Shutdown Circuitry
Crossover-Current Protection
Designed for pulse-width modulated (PWM) current control of dc
PHASE and ENABLE input terminals are provided for use in
Internal circuit protection includes thermal shutdown with
The A3948SB/SLB is supplied in a choice of two power
1.5 A, 50 V Continuous Output Rating
r
DS(on)
Outputs
DMOS FULL-BRIDGE PWM
MOTOR DRIVER