ANALOG PRODUCTS PC33997 FACT SHEET PC33997 3.3 / 5.0 VOLT SWITCHING POWER SUPPLY The PC33997 provides power supply sequencing for advanced microprocessor architectures such as the Motorola MPC5xx and 683xx microprocessor families. Simplified Application Diagram PC33997 KA_VPWR VSW 5.0 V VPWR VDDH 5.0 V MCU VREF1 DRVL 5.0 V VREF2 EN FBL 3.3 V VKAM 3.3 V SNSEN PWROK GND VKAMOK CUSTOMER BENEFITS • Low system cost, optimized performance/cost ratio • Reduced component count, simple circuit implementation • Simplified microprocessor power supply design due to proper power sequencing • Easily used in non-microprocessor applications • Switching converter improves power efficiency • Internal safety features with output voltage supervisory circuits Performance Operating Voltage Output Voltages VDDH VDDL Standby VKAM Sensor Supply VREF1 Sensor Supply VREF2 Regulation VDDH VDDL VKAM Operating Temp Typical Values 5.5 V - 40 V 5.0 V @ 1400 mA 3.3 V @ 400 mA 3.3 V @ 10 mA 5.0 V @ 200 mA 5.0 V @ 200 mA ± 0.1 V ± 0.15 V ± 0.3 V -40°C ≤ TA ≤ 125°C SWITCHING An additional 3.3 V output is provided for standby use along with two internally protected low RDS(on) LDMOS 5.0 V outputs for sensor use. Separate Enable inputs provide main and sensor supply output control with reset and power-on reset delay. POWER MANAGEMENT APPLICATIONS • Automotive Control Module Supply • Industrial Control Module Supply • Set Top Boxes • xDSL Module Supply The PC33997 is a multiple output, medium power, integrated supply operating from a 5.5 to 40 V input source. A 5.0 V output is provided by a sensorless current mode step-down switching supply. A 3.3 V output is provided by a linear regulator using an external pass transistor. FEATURES • Step-down switching regulator output VDDH = 5.0 V @ 1400 mA utilizing sensorless current mode control with soft start • Linear regulator with external pass transistor VDDL = 3.3 V • Low power standby linear regulator VKAM = 3.3 V @ 10 mA • Two sensor supplies protected against short-to-battery and short-to-ground • Reset signals, Power-On Reset Delay • Enable pin for main supplies, EN pin • Enable pin for sensor supplies, SNSEN pin • Power sequencing for advanced microprocessor architectures Current Short Shutdown Limit to GND Protection ● Under Voltage VDDH VKAM VREF1, VREF2 Ordering Information Short to VPWR (<18 V) ● ● ● ● Package 24 SOICW Contact Factory for Samples QUESTIONS • Are you looking for a simple, easy-to-design power supply solution for your embedded system? • Do you have to design an advanced microcontroller power supply with proper power sequencing and supervisory functions? • Would reduced power and thermal dissipation be an advantage by using a switching power supply? How to reach us: USA/EUROPE/Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217 1–303–675–2140 or 1–800–441–2447 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center, 3–20–1, Minami–Azabu. Minato–ku, Tokyo 106–8573 Japan 81–3–3440–3569 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong 852–26668334 Technical Information Center: 1–800–521–6274 HOME PAGE: http://www.motorola.com/semiconductors/ MOTOROLA and the Stylized M Logo are registered in the U.S. Patent & Trademark Office. All other prodcut or service names are the property of their respective owners. © Motorola, Inc. 2001 PC33997FS/D Rev. 0