A3909 Dual Full Bridge Motor Driver DESCRIPTION FEATURES AND BENEFITS Low R outputs The A3909 is a dual full bridge motor driver, designed for DS(on) Drives two DC motors or single stepper motor 12 V medium power applications. The outputs are rated for Low power standby (Sleep) mode with zero current drain operation through a power supply range of 4 to 18 V, and Thermal shutdown protection capable of up to 1 A per phase. Parallel operation option for 1.8 A, single DC motor Paralleling the outputs is possible for higher amperage single Overcurrent protection: DC motor applications. Output to supply short Output to GND short The four inputs (IN1 to IN4) can control DC motors in forward, Output load short reverse, brake, and coast modes, or a bipolar stepper motor in full- and half-step modes. The A3909 is supplied in a 10-pin MSOP package with exposed thermal pad (suffix LY) and a 10-pin SSOP (suffix LN) for PACKAGES: wave solder applications. Both packages are lead (Pb) free with 100% matte-tin leadframe plating. 10-pin MSOP 10-pin SSOP with exposed thermal pad (LN package) (LY package) Not to scale Functional Block Diagram Load Supply Load Supply VBB VBB Control IN1 OUT1 OUT1 Logic TSD Disable UVLO OCP OUT2 OUT2 VBB IN2 GND GND VBB Control IN3 OUT3 OUT3 Logic TSD Disable UVLO OCP OUT4 OUT4 VBB IN4 GND PAD Configuration Configuration for driving for parallel operation LY package 2 DC motors at 1.8 A A3909-DS, Rev. 3 January 20, 2021 MCO-0000529A3909 Dual Full Bridge Motor Driver SELECTION GUIDE Part Number Package Packing A3909GLNx-T* 10-pin SSOP 3000 pieces per 13-in. reel 10-pin MSOP with A3909GLYTR-T 4000 pieces per 13-in. reel exposed thermal pad *Contact Allegro Sales for availability of this package option. ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Unit Supply Voltage V 18 V BB Logic Input Voltage Range V 0.3 to 6 V IN Output Current I 1 A OUT Output Voltage V 0.3 to V + 1 V OUT BB Operating Ambient Temperature T G temperature range 40 to 105 C A Maximum Junction Temperature T 150 C J(max) Storage Temperature T 55 to 150 C stg Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Symbol Test Conditions* Value Unit LN package (estimated), on 1-layer PCB with copper limited 130 C/W to pin area Package Thermal Resistance R JA 2 LY package, on 2-layer PCB with 2.260 in. of copper area 48 C/W each side *Additional thermal information available on the Allegro website. Terminal List Table Number Name Function Pinout Diagram 1 IN1 Logic input 2 IN2 Logic input IN1 10 OUT1 1 3 VBB Input supply 9 IN2 2 PAD OUT2 4 IN3 Logic input (LY VBB 8 GND 3 package) 5 IN4 Logic input 7 IN3 4 OUT3 IN4 6 OUT4 5 6 OUT4 Motor terminal 7 OUT3 Motor terminal LN and LY packages 8 GND Ground 9 OUT2 Motor terminal 10 OUT1 Motor terminal PAD (LY package) Exposed thermal pad 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com