3958
DMOS FULL-BRIDGE PWM
MOTOR DRIVER
Designed for pulse-width modulated (PWM) current control of dc
motors, the A3958SB and A3958SLB are capable of continuous output
currents to 2 A and operating voltages to 50 V. Internal fixed off-
time PWM current-control timing circuitry can be programmed via a
serial interface to operate in slow, fast, and mixed current-decay
modes.
A3958SLB
CP
VREG
24
23
22
1
2
3
4
CP2
CP1
RANGE
NO
NC
CONNECTION
θ
PHASE and ENABLE input terminals are provided for use in
controlling the speed and direction of a dc motor with externally
applied PWM-control signals. The ENABLE input can be
programmed via the serial port to PWM the bridge in fast or slow
current decay. Internal synchronous rectification control circuitry is
provided to reduce power dissipation during PWM operation.
PHASE
OSC
21 OUT
B
V
BB 20 LOAD SUPPLY
5
6
7
8
GROUND
19
18
GROUND
GROUND
SENSE
GROUND
LOGIC SUPPLY
V
CC
17
16
9
9
ENABLE
DATA
OUT
A
Internal circuit protection includes thermal shutdown with
hysteresis, and crossover-current protection. Special power-up
sequencing is not required.
NO
NC
15
14
13
10
CONNECTION
MODE
CLOCK
11
12
÷
REF
The A3958SB/SLB is supplied in a choice of two power
packages, a 24-pin plastic DIP with a copper batwing tab (package
suffix ‘B’), and a 24-lead plastic SOIC with a copper batwing tab
(package suffix ‘LB’). In both cases, the power tab is at ground
potential and needs no electrical isolation.
STROBE
Dwg. PP-069
Note that the A3958SLB(SOIC) and A3958SB
(DIP) do not share a common terminal
assignment.
FEATURES
ABSOLUTE MAXIMUM RATINGS
I
2 A, 50 V Continuous Output Rating
Load Supply Voltage, VBB .................. 50 V
Output Current, IOUT........................ 2.0 A
Logic Supply Voltage, VDD ................ 7.0 V
Input Voltage, VIN .... -0.3 V to VDD + 0.3 V
Sense Voltage, VS ............................ 0.5 V
Reference Voltage, VREF .................. 2.7 V
Package Power Dissipation (TA = 25°C), PD
A3958SB ................................. 3.1 W*
A3958SLB ............................... 2.2 W*
Operating Temperature Range,
I Low rDS(on) Outputs (270 mΩ, Typical)
I Programmable Mixed, Fast, and Slow Current-Decay Modes
I Serial Interface Controls Chip Functions
I Synchronous Rectification for Low Power Dissipation
I Internal UVLO and Thermal-Shutdown Circuitry
I Crossover-Current Protection
TA ............................... -20°C to +85°C
Junction Temperature,
TJ ............................................ +150°C
Storage Temperature Range,
TS ............................. -55°C to +150°C
Always order by complete part number:
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any
set of conditions, do not exceed the specified
current rating or a junction temperature of 150°C.
Part Number
A3958SB
Package
RθJA
RθJT
24-pin batwing DIP
24-lead batwing SOIC
40°C/W
56°C/W
6°C/W
6°C/W
* Per SEMI G42-88 Specification.
A3958SLB
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