A3949
DMOS Full-Bridge Motor Driver
A3949SLB SOIC
Designed for PWM (pulse width modulated) control of dc motors, the
A3949 is capable of peak output currents to ±2.8 A and operating volt-
ages to 36 V.
N/C
1
2
3
4
5
6
7
8
16 N/C
MODE
PHASE
GND
15 VREG
14 VCP
PHASE and ENABLE input terminals are provided for use in control-
ling the speed and direction of a dc motor with externally applied PWM
control signals. Internal synchronous rectification control circuitry is
provided to reduce power dissipation during PWM operation.
GND
CP2
13
12
11
10
9
SLEEP
ENABLE
OUTA
CP1
Scale 1:1
OUTB
VBB
SENSE
Internal circuit protection includes thermal shutdown with hysteresis,
undervoltage monitoring of VBB and VCP , and crossover current protec-
tion.
A3949SLP TSSOP
N/C
MODE
PHASE
GND
16
15
14
13
12
11
10
9
The A3949 is supplied in a choice of two power packages, a 16-pin
plastic SOIC with a copper batwing tab (part number suffix LB), and
a low profile (1.1mm) 16-pin TSSOP (suffix LP) with exposed power
tab. Both packages are available in a lead-free version (100% matte tin
leadframe).
1
2
3
4
5
6
7
8
N/C
VREG
VCP
GND
CP2
SLEEP
ENABLE
CP1
Scale 1:1
OUTA
OUTB
VBB
SENSE
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage
FEATURES
V
V
BB...............................................................36 V
BB (Peak < 2 µs) ........................................38 V
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Single supply operation
Very small outline package
Low RDS(ON) outputs
Sleep function
Internal UVLO
Output Current, IOUT (Repetitive)1....................±2.8 A
Sense Voltage, VSENSE .........................................0.5 V
Logic Input Voltage, VIN ..................... –0.3 V to 7 V
Package Power Dissipation, PD
A3949SLB2 ......................................... 52ºC / W
A3949SLP3.......................................... 34ºC / W
Operating Temperature Range
Crossover current protection
Thermal shutdown protection
Ambient Temperature, TA.............–20°C to +85°C
Junction Temperature, TJ..................+150°C Max.
Storage Temperature, TS ..........–55°C to +150°C
Use the following complete part numbers when ordering:
1Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any set of
conditions, DO NOT exceed the specified IOUT or TJ.
2Measured on a typical two-sided PCB with 2 in.2 copper
ground plane.
Part Number
A3949SLB
Package
Description
16-pin, SOIC
16-pin, SOIC
16-pin, TSSOP
16-pin, TSSOP
Copper batwing tab
A3949SLB-T
A3949SLP
Copper batwing tab; Lead-free
Exposed thermal pad
3Measured on a JEDEC-standard "High-K" 4-layer PCB.
A3949SLP-T
Exposed thermal pad; Lead-free