L6474 Fully integrated microstepping motor driver Datasheet - production data Applications Bipolar stepper motor Description The L6474 device, realized in analog mixed POWERSO36 HTSSOP28 signal technology, integrates a dual low R DS(on) DMOS full bridge with all power switches equipped with an accurate on-chip current sensing circuitry suitable for non-dissipative Features current control and overcurrent protections. Thanks to a new current control, a 1/16 Operating voltage: 8 - 45 V microstepping is achieved through an adaptive 7.0 A output peak current (3.0 A ) r.m.s. decay mode which outperforms traditional Low R power MOSFETs implementations. DS(on) Programmable power MOS slew rate All data registers, including those used to set analogue values (i.e.: current control value, Up to 1/16 microstepping current protection trip point, deadtime, etc.) are Current control with adaptive decay sent through a standard 5 Mbit/s SPI. Non-dissipative current sensing A very rich set of protections (thermal, low bus SPI interface voltage, overcurrent) makes the L6474 device Low quiescent and standby currents bullet proof as required by the most demanding motor control applications. Programmable non-dissipative overcurrent protection on all power MOS Two-level overtemperature protection Table 1. Device summary Order code Package Packing L6474H HTSSOP28 Tube L6474HTR HTSSOP28 Tape and reel L6474PD POWERSO36 Tube L6474PDTR POWERSO36 Tape and reel March 2015 DocID022529 Rev 4 1/53 This is information on a product in full production. www.st.comContents L6474 Contents 1 Block diagram 7 2 Electrical data 8 2.1 Absolute maximum ratings . 8 2.2 Recommended operating conditions . 9 2.3 Thermal data . 9 3 Electrical characteristics 10 4 Pin connection . 15 Pin list 16 5 Typical applications 18 6 Functional description 19 6.1 Device power-up . 19 6.2 Logic I/O 19 6.3 Charge pump 19 6.4 Microstepping 20 6.5 Absolute position counter . 21 6.6 Step sequence control . 21 6.7 Enable and disable commands 21 6.8 Internal oscillator and oscillator driver . 22 6.8.1 Internal oscillator 22 6.8.2 External clock source . 22 6.9 Overcurrent detection 23 6.10 Undervoltage lockout (UVLO) . 24 6.11 Thermal warning and thermal shutdown . 24 6.12 Reset and standby 24 6.13 Programmable DMOS slew rate, deadtime and blanking-time 25 6.14 Integrated analog to digital converter 25 6.15 Internal voltage regulator . 25 2/53 DocID022529 Rev 4