Dual Full-Bridge DMOS
PWM Motor Driver
A4954
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Terminal List Table
Number Name Function
1 GND Ground
2 VREF34 Analog input for bridge 3-4
3 IN3 Logic input 3
4 IN4 Logic input 4
5 IN2 Logic input 2
6 IN1 Logic input 1
7 VREF12 Analog input for bridge 1-2
8 GND Ground
9 VBB Load supply voltage
10 OUT1 DMOS full bridge output 1
11 LSS12 Power return – sense resistor connection for bridge 1-2
12 OUT2 DMOS full bridge output 2
13 OUT3 DMOS full bridge output 3
14 LSS34 Power return – sense resistor connection for bridge 3-4
15 OUT4 DMOS full bridge output 4
16 VBB Load supply voltage
– PAD Exposed pad for enhanced thermal dissipation
Pin-out Diagram
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Unit
Load Supply Voltage V
BB
40 V
Logic Input Voltage Range V
IN
–0.3 to 6 V
V
REF
Input Voltage Range V
REF
–0.3 to 6 V
Sense Voltage (LSSx pin) V
S
–0.5 to 0.5 V
Motor Outputs Voltage V
OUT
–2 to 42 V
Output Current I
OUT
Duty cycle = 100% 2 A
Transient Output Current i
OUT
T
W
< 500 ns 5 A
Operating Temperature Range T
A
Temperature Range E –40 to 85 °C
Maximum Junction Temperature T
J
(max) 150 °C
Storage Temperature Range T
stg
–55 to 150 °C
Selection Guide
Part Number Packing
A4954ELPTR-T 4000 pieces per 13-in. reel
A4954ELP-T 96 pieces per tube
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic Symbol Test Conditions* Value Unit
Package Thermal Resistance
R
JA
On 2-layer PCB with 3.8 in
2
. exposed 2-oz. copper each side 43 ºC/W
On 4-layer PCB based on JEDEC standard 34 ºC/W
*Additional thermal information available on the Allegro website.
GND
VREF34
IN3
IN4
IN2
IN1
VREF12
GND
VBB
OUT4
LSS34
OUT3
OUT2
LSS12
OUT1
VBB
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PAD
