A3949
DMOS Full-Bridge Motor Driver
A3949SLB SOIC
N/C
MODE
PHASE
GND
SLEEP
ENABLE
1
2
3
4
5
6
7
8
16 N/C
15 VREG
14 VCP
13 GND
12 CP2
11
CP1
Data Sheet
29319.47C
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 rectification 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 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).
Scale 1:1
OUTA
SENSE
10 OUTB
9
VBB
A3949SLP TSSOP
N/C
MODE
PHASE
GND
SLEEP
1
2
3
4
5
6
7
8
16 N/C
15 VREG
14 VCP
13 GND
12 CP2
11 CP1
10 OUTB
9 VBB
Scale 1:1
ENABLE
OUTA
SENSE
ABSOLUTE MAXIMUM RATINGS
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
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any set of
conditions,
DO NOT
exceed the specified 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.
1
FEATURES
Single supply operation
Very small outline package
Low R
DS(ON)
outputs
Sleep function
Internal UVLO
Crossover current protection
Thermal shutdown protection
Use the following complete part numbers when ordering:
Part Number
A3949SLB
A3949SLB-T
A3949SLP
A3949SLP-T
Package
16-pin, SOIC
16-pin, SOIC
16-pin, TSSOP
16-pin, TSSOP
Description
Copper batwing tab
Copper batwing tab; Lead-free
Exposed thermal pad
Exposed thermal pad; Lead-free
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