A4954 Dual Full-Bridge DMOS PWM Motor Driver Description Features and Benefits Low R outputs DS(on) Designed for pulse width modulated (PWM) control of two Overcurrent protection (OCP) DC motors, the A4954 is capable of peak output currents to Motor short protection 2 A and operating voltages to 40 V. Motor lead short to ground protection Input terminals are provided for use in controlling the speed and Motor lead short to battery protection direction of a DC motor with externally applied PWM control Low Power Standby mode signals. Internal synchronous rectification control circuitry is Adjustable PWM current limit provided to lower power dissipation during PWM operation. Synchronous rectification Internal undervoltage lockout (UVLO) Internal circuit protection includes overcurrent protection, Crossover-current protection motor lead short to ground or supply, thermal shutdown with hysteresis, undervoltage monitoring of V , and crossover- BB Package: 16-pin TSSOP with exposed current protection. thermal pad (suffix LP) The A4954 is provided in a low-profile 16-pin TSSOP package with exposed thermal pad (suffix LP) that is lead (Pb) free, with 100% matte tin leadframe plating. Not to scale Functional Block Diagram Load Supply Charge OSC VBB Pump IN1 Control Logic Disable OUT1 TSD UVLO IN2 OUT2 7V GND LSS12 VREF12 10 (Optional) Charge OSC VBB Pump IN3 Control Logic Disable OUT3 TSD UVLO IN4 OUT4 7V GND LSS34 VREF34 10 (Optional) A4954-DS, Rev. 4Dual Full-Bridge DMOS A4954 PWM Motor Driver Selection Guide Part Number Packing A4954ELPTR-T 4000 pieces per 13-in. reel A4954ELP-T 96 pieces per tube Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit Load Supply Voltage V 40 V BB Logic Input Voltage Range V 0.3 to 6 V IN V Input Voltage Range V 0.3 to 6 V REF REF Sense Voltage (LSSx pin) V 0.5 to 0.5 V S Motor Outputs Voltage V 2 to 42 V OUT Output Current I Duty cycle = 100% 2 A OUT Transient Output Current i T < 500 ns 5 A OUT W Operating Temperature Range T Temperature Range E 40 to 85 C A Maximum Junction Temperature T (max) 150 C J Storage Temperature Range T 55 to 150 C stg Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Symbol Test Conditions* Value Unit 2 On 2-layer PCB with 3.8 in. exposed 2-oz. copper each side 43 C/W Package Thermal Resistance R JA On 4-layer PCB based on JEDEC standard 34 C/W *Additional thermal information available on the Allegro website. Terminal List Table Number Name Function 1 GND Ground 2 VREF34 Analog input for bridge 3-4 3 IN3 Logic input 3 Pin-out Diagram 4 IN4 Logic input 4 5 IN2 Logic input 2 16 GND 1 VBB VREF34 15 OUT4 2 6 IN1 Logic input 1 14 IN3 3 LSS34 7 VREF12 Analog input for bridge 1-2 IN4 13 OUT3 4 PAD 8 GND Ground 12 IN2 5 OUT2 IN1 11 LSS12 6 9 VBB Load supply voltage 10 VREF12 7 OUT1 10 OUT1 DMOS full bridge output 1 GND 9 VBB 8 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 Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com