Analog, Mixed-signal and Power Management MC33730 Switch mode power supply with multiple linear regulators Applications MC33730 Simplified Application Drawing • Automotive Power Train • Engine Control • Transmission Control 33730 • Electronic Power Steering • Industrial + + VBAT BOOT SW + MCU (MPC5XXX) Overview PFD KA_VBAT The 33730 is a multiple output power supply integrated circuit for automotive applications. The integrated circuit (IC) incorporates a switching regulator, which operates over a wide input voltage range, from +4.5 to +26.5 V. The step-down switching regulator utilizes a fixed frequency PWM voltage mode control. It has a 3.5 A current limit (typ.) and the Slew-rate is adjustable via a control pin, to reduce the switching noise. The switching regulator has an adjustable frequency oscillator, which allows the user to optimize its operation over a wide range of input voltages and component values. The linear regulators can be configured either as two normal mode regulators VDD3, VDDL and one standby regulator VKAM, or as one normal mode linear regulator (VDDL) and two standby regulators (VKAM and VDD3 Standby). Two protected outputs VREF (1, 2) are used to provide power to the external sensors. VIGN IGN_ON 5.0V + VDDH 5.0V INV VCOMP VDD3_B VDD3 3.3V VDDL_B VDDL 1.5V VREF1,2 P1 P2 P3 CP VKAM 5.0 V GND RSTs HRT REGON KA_1.0V Features Parametric Table • Provides all regulated voltages for Freescale’s 32-bit microcontroller families Part Number • Wide operating input voltage range of buck regulator up to +35 V MCZ33730EK/R2 • Adjustable frequency switching buck regulator with slew-rate control Max Input Voltage Output Current Temperature Range Package 40 V 2.0 A -40 °C to 125 °C 32 SOICW-EP MC33730EK/R2 Development Tools Part Number Description • Programmable voltages VDDL, VDD3 - ±3% accuracy KIT33730EKEVBE Evaluation board to demonstrate the key features of the MC33730 • Programmable standby regulator VKAM ±15% accuracy, operating down to 4.5 V at KA_VBAT pin Document Number Title Description MC33730 Data Sheet Presents the specifications for the product • VDD3 can be programmed as an optional second standby regulator with ±15% accuracy SG1002 Selector Guide Analog and power management device comparison SG187 Selector Guide Automotive device comparison • Power sequencing Documentation • Provides two 5.0 V Protected supplies for sensors • Low quiescent current IQ = 500 μA maximum over temperature. • Provides gate drive for a reverse battery protection FET • Provides necessary MCU monitoring and failsafe support Benefits • System solution for the electronic control module • Supports 32-bit and other microcontroller families • Low system cost Questions • High performance, improved efficiency • Q. Why use a switching regulator? • Protection and safety features A. To increase efficiency, wasting less power as heat. • Automotive temperature range & reliability Freescale Semiconductor is a leading provider for over 25 years of high-performance products using SMARTMOS™ technology that combines digital, power and standard analog functions. The company supplies analog and power management ICs for the automotive, consumer, networking and industrial markets. Freescale’s analog and power ICs complement our broad portfolio of micro controllers, microprocessors, ZigBee® technology, digital signal processors, sensors, with development tools and support to provide system solutions to customers. • Q. Are the different output voltages programmable? A. Yes. There are eight different combinations of voltages for the VDDL, VDD3 and VKAM. • Q. Can the MCU keep the MC33730 enabled even when the ignition input is turned off. A. Yes. The enable input, from the MCU can override the ignition input to allow the MCU to stay powered until it is ready to shut down. • Q. Does this IC have applications anywhere else besides Automotive ECUs. A. Yes. The MC33730 is a general purpose switching power supply that can be used in many other commercial, industrial and consumer applications. Learn More: For current information about Freescale products, please visit www.freescale.com. Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc., 2012 All rights reserved. Document Number: MC33730FS, Rev. 3.0