A3950 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – DMOS Full-Bridge Motor Driver

A3950 ^{Preliminary Data Sheet}
Subject to Change without Notice
November 4, 2005
DMOS Full-Bridge Motor Driver
Package LP, 16-pin TSSOP
with Exposed Thermal Pad
NFAULT 1
MODE 2
PHASE 3
GND 4
SLEEP 5
ENABL 6
OUTA 7
SENSE 8
Fault
Control
Logic
Charge
Pump
16 NC
15 VREG
14 VCP
13 GND
12 CP2
11 CP1
10 _OUTB
9 _VBB
Designed for PWM (pulse width modulated) control of dc motors, the
A3950 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 lower power dissipation during PWM operation.
Internal circuit protection includes motor lead short-to-supply / short-to-
ground, thermal shutdown with hysteresis, undervoltage monitoring of
V_BB and V_CP, and crossover-current protection.
The A3950 is supplied in a thin profile (<1.2 mm overall height) 16-pin
TSSOP package with exposed thermal pad (package LP). It is lead (Pb)
free with 100% matte tin leadframe plating.
Approximate Scale 1:1
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, V_{BB.............................................} 36 V
Output Current, I_{OUT.......................................................} 2.8 A
Sense Voltage, V_SENSE.................................±500 mV
VBB to OUTx .................................................... 36 V
OUTx to SENSE ................................................ 36 V
Logic Input Voltage, V_IN..........................–0.3 to 7 V
Operating Temperature Range
Ambient, T_A, Range S .................... –20°C to 85°C
Junction Temperature, T_J(MAX)............................ 150°C
Storage Temperature, T_S ................. –40°C to 125°C
FEATURES
„ Low R_DS(on) outputs
„ Overcurrent protection
„ Motor lead short-to-supply protection
„ Short-to-ground protection
„ Sleep function
„ Synchronous rectification
„ Diagnostic output
„ Internal UVLO
„ Crossover-current protection
Use the following complete part numbers when ordering:
Part Number
A3950SLP-T
A3950SLPTR-T
Packing
96 pieces / tube
13-in. reel, 4000 pieces / reel
A3950DS