MC34700EP

io n Power Management Fact Sheet rm at MC34700 9.0V to 18V quad-output power supply Wide Operating Range Applications The MC34700 is a 9.0V to 18V quad-output Channel 1 of the MC34700 can operate from • Set-top boxes integrated MOSFET power supply that is ideal an input voltage of 9.0V to 18V, while channels for power designs in space-constrained 2, 3 and 4 operate from an input voltage of • Cable modems applications. This power management IC 1.5V to 6.0V. Channels 2 and 3 can derive contains three step-down switching regulators their input supplies from the output of channel and one low-dropout linear regulator, making 1 or from an external bias voltage. Channel 4 • Inkjet printers it a compact, simple-to-use and flexible can derive its input supply from any of the • Scanners general-purpose power product for a variety outputs of channels 1 through 3, or from an • Televisions of power design requirements. external bias voltage. • Small appliances Ar c hi ve in fo Overview Four Power Rails from One Control IC Four output rails can be generated from a single control IC, supplying power for such components as microprocessors, microcontrollers, memory, small motors and LCD panels. The switching regulators utilize voltage-mode control with external compensation, allowing flexibility in optimizing the performance of the MC34700 for the needs of a given application. Each output channel features a separate enable input, providing control over the power-up sequencing characteristics of all four output power rails. • Point-of-sale terminals • Laser printers The MC34700 features a power-good output, • Telecom line cards in addition to overvoltage, undervoltage, • DVD players overcurrent and overtemperature protection, ensuring robust and reliable operation and exceptional fault tolerance. In addition to the internal power MOSFETs, the MC34700 features a fixed 800 kHz switching frequency and internal soft-start, enabling rapid power supply design and development. This frees the power designer from the burden of choosing power MOSFETs, optimizing switching frequencies or programming soft-start times. MC34700 Simplified Application Diagram VIN1 9.0V–18V VIN VOUT1 VIN2 VIN3 BST1 SW1 COMP1 VIN1 VDDI VGREG Power Good VOUT1 2.0V–5.25V, 1.5A FB1 BST2 SW2 PGOOD VOUT2 0.7V–3.6V, 1.25A COMP2 EN1 EN1 EN1 EN_LDO FB2 MC34700 BST3 SW3 VOUT3 0.7V–3.6V, 1.25A COMP3 AGND FB3 GND2 LDO_VIN LDO io n Enable 1 Enable 2 Enable 3 Enable 4 GND3 Features Parametric Table • Three switching regulators: two synchronous Performance and one non-synchronous • One low dropout linear regulator • Output current capability: 1.5A continuous on channel 1 400 mA continuous on channel 4 • Internal power MOSFETs on all channels • Voltage feedforward on channel 1 VOUT1 = 2.0V to 5.25V; VOUT2 = 0.7V to 3.6V; VOUT3 = 0.7V to 3.6V; LDO = 0.7V to 3.6V Output Currents IOUT1 = 1500mA; IOUT2 and IOUT3 = 1250mA; LDO = 400mA PWM 800 KHz ESD 2 KV Control/Communication Parallel Operating Voltage VIN1 = 9–18V; VIN2, VIN3, LDO_VIN = 1.5–6V Temp. Ranges (TA ) -40ºC to +85ºC Ar c • ±1.5% output voltage accuracy on all channels • Cycle-by-cycle current limit and short-circuit protection Output Voltages hi ve 1.25A continuous on channels 2 and 3 Typical Values 3 Buck DC/DC, 1 Linear in fo Voltage Regulators rm at LDO_FB VOUT4 0.7V–3.6V, 0.4A Orderable Parts Part Number Description • Fixed 800 kHz switching frequency MC34700EP/R2 9.0–18V, 4-ch. multi-purpose power supply • Internal soft-start KIT34700EPEVBE Evaluation board • Overvoltage and undervoltage protection Documentation • Overtemperature protection Document Number Document Type Description • Open-drain power-good output signal MC34700 Data Sheet Electrical specifications for this product • Separate active high enable input for SG1002 Selector Guide Analog and power management device comparison AN3592 Application Note Low power management unit with MC34700 AN1902 Application Note Quad Flat No-Lead (QFN) each channel Learn More: Freescale and the Freescale logo are trademarks or registered trademarks of Freescale Semiconductor, Inc. in the U.S. and other countries. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc. 2008 Document Number: MC34700FS REV 1 For more information about Freescale products, please visit www.freescale.com/analog.