MC33998

Freescale Semiconductor Technical Data Document Number: MC33998 Rev. 2.0, 8/2006 Switching Power Supply with Linear Regulators The 33998 is a medium-power, multi-output power supply integrated circuit that is capable of operating over a wide input voltage range, from 6.0 V up to 26.5 V with 40 V transient capability. It incorporates a sensorless current mode control step-down switching controller regulating directly to 5.0 V. The 2.6 V linear regulator uses an external pass transistor to reduce the 33998 power dissipation. The 33998 also provides a 2.6 V linear standby regulator and two 5.0 V sensor supply outputs protected by internal lowresistance LDMOS transistors. There are two separate enable pins for the main and sensor supply outputs and standard supervisory functions such as resets with www.DataSheet4U.com power-up reset delay. The 33998 provides proper power supply sequencing for advanced microprocessor architectures such as the MPC5xx and 683xx microprocessor families. 33998 SWITCHING REGULATOR DW SUFFIX EG SUFFIX (PB-FREE) 98ASB42344B 24-PIN SOICW ORDERING INFORMATION Features Operating Voltage Range 6.0 V up to 26.5 V (40 V transient) Temperature Device Package Range (TA) Step-Down Switching Regulator Output VDDH = 5.0 V @ 1400 mA (total) MC33998DW/R2 Linear Regulator with External Pass Transistor VDDL = 2.6 V @ -40°C to 125°C 24 SOICW MCZ33998EG/R2 400 mA Low-Power Standby Linear Regulator VKAM = 2.6 V @ 10 mA Two 5.0 V @ 200 mA (typical) Sensor Su...