MC34700 9.0 to 18 V, Quad Output, Integrated MOSFET Power Supply Rev. 5.1 11 September 2017 Data sheet: technical data 1 General description The 34700 is a compact, high-efficiency power supply with on-chip power MOSFETs that features three step-down switching regulators and one low dropout linear regulator. The switching regulators utilize voltage mode control with external compensation, allowing flexibility in optimizing the performance of the 34700 for a given application. The 34700 is ideal for space constrained applications where multiple power rails are required and simplicity of design and implementation of the power supply is necessary. Overvoltage, undervoltage, overcurrent, and overtemperature protection features ensure robust and reliable operation. Fixed switching frequency, internal soft-start, and internal power MOSFETs enable rapid power supply design and development. The 34700 is well suited for power supply designs in wide variety of applications, including set top boxes, cable modems, laser printers, fax machines, point-of-sale terminals, small appliances, telecom line cards, and DVD players. 2 Simplified application diagram Figure 1.34700 application diagramNXP Semiconductors MC34700 9.0 to 18 V, Quad Output, Integrated MOSFET Power Supply 3 Features and benefits Three switching regulators: 2 synchronous and 1 nonsynchronous One low dropout linear regulator Output current capability: 1.5 A continuous on channel 1 1.25 A continuous on channels 2 and 3 400 mA continuous on channel 4 Internal power MOSFETs on all channels Voltage feed-forward on channel 1 1.5 % output voltage accuracy on all channels Cycle-by-cycle current limit and short-circuit protection Fixed 800 kHz switching frequency Internal soft-start Overvoltage, undervoltage and overtemperature protection Open-drain power-good output signal Separate active-high enable input for each channel Pb-free packaging designated by suffix code EP 4 Applications Set-top boxes and receivers Cable modems Networking cards Telecom line cards 5 Orderable parts Table 1.Orderable part variations Part number Temperature (T ) Package A MC34700EP/R2 40 C to 85 C 32 QFN MC34700 All information provided in this document is subject to legal disclaimers. NXP B.V. 2017. All rights reserved. Data sheet: technical data Rev. 5.1 11 September 2017 2 / 39