Data Sheet29319.47C
A3949
DMOS Full-Bridge Motor Driver
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.
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 rectifi cation control circuitry is
provided to reduce power dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with hysteresis,
undervoltage monitoring of V
BB
and V
CP
, and crossover current protec-
tion.
The A3949 is supplied in a choice of two power packages, a 16-pin
plastic SOIC with a copper batwing tab (part number suffi x LB), and
a low profi le (1.1mm) 16-pin TSSOP (suffi x LP) with exposed power
tab. Both packages are available in a lead-free version (100% matte tin
leadframe).
null Single supply operation
null Very small outline package
null Low R
DS(ON)
outputs
null Sleep function
null Internal UVLO
null Crossover current protection
null Thermal shutdown protection
Use the following complete part numbers when ordering:
AB SO LUTE MAX I MUM RAT INGS
Part Number Package Description
A3949SLB 16-pin, SOIC Copper batwing tab
A3949SLB-T 16-pin, SOIC Copper batwing tab; Lead-free
A3949SLP 16-pin, TSSOP Exposed thermal pad
A3949SLP-T 16-pin, TSSOP Exposed thermal pad; Lead-free
Load Supply Voltage
V
BB
...............................................................36 V
V
BB
(Peak < 2 µs) ........................................38 V
Output Current, I
OUT
(Repetitive)
1
....................±2.8 A
Sense Voltage, V
SENSE
.........................................0.5 V
Logic Input Voltage, V
IN
..................... –0.3 V to 7 V
Package Power Dissipation, P
D
A3949SLB
2
......................................... 52ºC / W
A3949SLP
3
.......................................... 34ºC / W
Operating Temperature Range
Ambient Temperature, T
A
.............–20°C to +85°C
Junction Temperature, T
J
..................+150°C Max.
Storage Temperature, T
S
..........–55°C to +150°C
1
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any set of
conditions, DO NOT exceed the specifi ed I
OUT
or T
J
.
2
Measured on a typical two-sided PCB with 2 in.
2
copper
ground plane.
3
Measured on a JEDEC-standard "High-K" 4-layer PCB.
FEATURES
A3949SLB SOIC
A3949SLP TSSOP
3
4
5
6
7
8
2
1
14
13
12
11
10
9
15
16N/C
MODE
PHASE
GND
SLEEP
ENABLE
OUTA
SENSE
N/C
VREG
VCP
GND
CP2
CP1
OUTB
VBB
3
4
5
6
7
8
2
1
14
13
12
11
10
9
15
16N/C
MODE
PHASE
GND
SLEEP
ENABLE
OUTA
SENSE
N/C
VREG
VCP
GND
CP2
CP1
OUTB
VBB
Scale 1:1
Scale 1:1