1.5A Switch-Mode Power Supply with Linear Regulator

Topology: Buck
Input Voltage (min.): 3.30 V
Input Voltage (max.): 3.30 V
Switching Frequency (min.): 200.00 kHz
Switching Frequency (max.): 400.00 kHz
Output 1: 1.80 V / 1.500 A

Original publication on 2006-02-01, revision 7.0


The 34701 provides the means to efficiently supply the FreescalePower QUICC™ I, II, and other families of Freescalemicroprocessors and DSPs. The 34701 incorporates a highperformance switching regulator, providing the direct supply for themicroprocessor’s core, and a low dropout (LDO) linear regulatorcontrol circuit provides the microprocessor I/O and bus voltage.The switching regulator is a high-efficiency synchronous buckregulator with integrated N-channel power MOSFETs to provideprotection features and to allow space-efficient, compact design.The 34701 incorporates many advanced features; e.g., preciselymaintained up/down power sequencing, ensuring the properoperation and protection of the CPU and power system.


  • Operating voltage from 2.8V to 6.0V• High-accuracy output voltages• Fast transient response• Switcher output current up to 1.5A• Under-voltage lockout and overcurrent protection• Enable inputs and programmable watchdog timer• Voltage margining via I2C™ bus• Reset with programmable power-ON delay• Pb-free packaging designated by suffix code EWI2C is a trademark of Philips Corporation.


  Order Code SPEC Product series L
RDC typ.
RDC max.
Bauform Version Samples
74477004 PDF WE-PD SMT Power Inductor 4.7 8.5 9.3 12 16 31.2 1280 Standard