A4952 and A4953 Full-Bridge DMOS PWM Motor Drivers Description Features and Benefits Low R outputs DS(on) Designed for pulse width modulated (PWM) control of DC Overcurrent protection (OCP) motors, the A4952 and A4953 are capable of peak output Motor short protection currents to 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 Fault output (A4952 only) hysteresis, undervoltage monitoring of V , and crossover- BB Selectable retry (A4952 only) current protection. Packages: The A4952 is provided in a low-profile 10-pin MSOP package (suffix LY) and the A4953 is provided in a low-profile 10-pin MSOP 8-pin SOICN package. Both packages have an exposed with exposed thermal pad thermal pad, and are lead (Pb) free, with 100% matte tin (LY package) leadframe plating. 8-pin SOICN with exposed thermal pad (LJ package) Not to scale Functional Block Diagram Load Supply V INT A4952 only Charge OSC VBB Pump RTRY IN1 Control Logic Disable OUT1 IN2 TSD UVLO OUT2 7V GND A4952 only FLTn LSS VREF 10 (Optional) A4952-DSA4952 and Full-Bridge DMOS PWM Motor Drivers A4953 Selection Guide Part Number Packing A4952ELYTR-T 4000 pieces per 13-in. reel A4953ELJTR-T 3000 pieces per 13-in. reel Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit Load Supply Voltage V 40 V BB Logic I/O Voltage Range V 0.3 to 6 V IN FLTn Sink Current I 10 mA FLTN V Input Voltage Range V 0.3 to 6 V REF REF Sense Voltage (LSS 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 6 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 LJ package, on 4-layer PCB based on JEDEC standard 35 C/W 2 LJ package, on 2-layer PCB with 0.8 in. 2-oz. copper each side 62 C/W Package Thermal Resistance R JA LY package, on 4-layer PCB based on JEDEC standard 48 C/W 2 LY package, (estimate) on 2-layer PCB with 1 in. 2-oz. copper each side 60 C/W *Additional thermal information available on the Allegro website. Terminal List Table Number Pin-out Diagrams Name Function A4952 A4953 GND 1 8 OUT2 FLTn 1 Fault output, active low IN2 2 7 LSS PAD GND 10 1 Ground IN1 OUT1 3 6 IN1 4 3 Logic input 1 VREF 4 5 VBB IN2 3 2 Logic input 2 LJ Package (A4953) LSS 8 7 Power return sense resistor connection OUT1 7 6 DMOS full bridge output 1 FLTn 10 GND 1 OUT2 9 8 DMOS full bridge output 2 9 RTRY 2 OUT2 PAD Exposed pad for enhanced thermal dissipation IN2 8 LSS 3 PAD 7 RTRY 2 Logic input IN1 4 OUT1 VREF 6 VBB 5 VBB 6 5 Load supply voltage VREF 5 4 Analog input LY Package (A4952) Allegro MicroSystems, Inc. 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com