3971
ADVANCE INFORMATION
(Subject to change without notice)
May 2, 2000
DUAL DMOS
FULL-BRIDGE DRIVER
Designed to interface between external PWM control logic and
inductive loads such as relays, solenoids, dc motors, or stepper motors,
each full bridge can operate with output currents to
鹵2.5
A and operating
voltages to 50 V.
Low r
DS(on)
DMOS output drivers provide low power dissipation
during PWM operation. Internal charge pump circuitry is used to create
a boosted voltage to fully enhance the high-side DMOS switches.
Three TTL-compatible logic-input terminals per bridge allow flex-
ibility in configuring PWM control.
Internal circuit protection includes thermal shutdown with hysteresis,
and crossover-current protection. Special power -up sequencing is not
required.
The A3971SLB is supplied in a 24-lead plastic SOIC with a copper
batwing tab. The power tab is at ground potential and needs no electri-
cal isolation.
Data Sheet
29319.32
NO
CONNECTION
LOGIC
GROUND
S
10
OUT
1A
LOAD
SUPPLY
1
GROUND
GROUND
SENSE
1
OUT
1B
S
11
PWM
1
CP1
1
2
3
4
5
6
7
8
9
9
10
11
12
NC
V
DD
24
23
22
21
20
19
18
17
16
15
14
LOGIC
SUPPLY
PWM
2
S
20
OUT
2A
LOAD
SUPPLY
2
GROUND
GROUND
SENSE
2
OUT
2B
S
21
V
CP
CP2
V
BB1
V
BB2
LOGIC
LOGIC
CHARGE PUMP
13
Dwg. PP-069-2
ABSOLUTE MAXIMUM RATINGS
at TA = +25擄C
Load Supply Voltage, V
BB
................
50 V
Output Current, I
OUT
Transient (<500 ns) ...................
鹵5
A
Logic Supply Voltage,
V
DD
............................................
7.0 V
Sense Voltage, V
SENSE
......................
0.5 V
Logic Input Voltage Range,
V
IN
..................
-0.3 V to V
DD
+ 0.3 V
High-Side Gate Voltage ...........
V
BB
+ 8 V
Package Power Dissipation,
P
D
.............................................
2.2 W
Operating Temperature Range,
T
A
.............................
-20擄C to +85擄C
Junction Temperature, T
J
.............
+150擄C
Storage Temperature Range,
T
S
...........................
-55擄C to +150擄C
Output duty cycle, ambient temperature, and
heat sinking may limit current rating. Under
any set of conditions, do not exceed the
specified current rating or a junction tempera-
ture of 150
擄C.
FEATURES
I
鹵2.5
A Load Current Capability per Bridge
I
Parallel Outputs for 5 A Load-Current Capability
I
Low r
DS(on)
Outputs
Typically 325 m鈩?source, 175 m鈩?sink
I
Synchronous Rectification via Control Logic
I
Internal Undervoltage Monitor
I
Crossover-Current Protection
I
Source Connections for External Current Sensing
I
Thermal Shutdown Circuitry
Always order by complete part number:
A3971SLB
.
1
2
3
4
5
6
7
8
