3971 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – DUAL DMOS FULL-BRIDGE DRIVER

3971
ADVANCE INFORMATION
(Subject to change without notice)
May 2, 2000
NO
CONNECTION
1
NC
LOGIC
GROUND
2
S10 ₃
VDD
24
LOGIC
SUPPLY
23 PWM2
22 S20
OUT1A 4
LOAD ₅
SUPPLY1
VBB1
GROUND 6
21 OUT2A
LOAD
20
VBB2
SUPPLY2
19 GROUND
GROUND 7
18 GROUND
SENSE1 8
17 SENSE2
OUT1B 99
16 OUT2B
S11 10
15 S21
PWM1 11
14 VCP
CP1 12
CHARGE PUMP
13 CP2
Dwg. PP-069-2
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Load Supply Voltage, V_BB ................ 50 V
Output Current, I_OUT
Transient (<500 ns) ................... ±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°C to +85°C
Junction Temperature, T_J ............. +150°C
Storage Temperature Range,
T_S ........................... -55°C to +150°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 °C.
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 ±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.
FEATURES
I ±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 mΩ source, 175 mΩ 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 .