Step-Up PWM/PFM Regulator IC measures 1.6 x 1.8 x 0.5 mm.

Press Release Summary:

Series S-8363 in SOT-23-6 package includes N-channel MOSFET with RDS(ON) of 0.25 W, permitting output current of 300 mA. Input voltage range is 0.9-4.5 V, while output voltage can be set from 1.8-5.0 V, and current consumption is 95 µA during switching stop and 3.0 µA with power-off pin set to off. Step-up DC-DC converter IC has switching frequency of 1.2 MHz and changeover from PFM to PWM is set to 13% typical. Featuring efficiency of 85%, unit also has overcurrent protection circuit.

Original Press Release:

S-8363 Series Super Small Package Step-Up PWM/PFM Regulator Released

NEU ISENBURG, Germany - Seiko Instruments officially released a new Step-Up DC-DC converter IC

Series S-8363 that is unique in a number of ways. It is available in SOT-23-6 and tiny SNT-6A package which measures mere 1.6mm x 1.8mm x 0.5mm, enabling tight designs of small portable equipment. It incorporates a N-ch power MOSFET with ON resistance of only 0.25 Ohm, permitting output current of 300mA (@ VIN = 1.8V, VOUT = 3.3V). The input voltage range from 0.9V to 4.5V makes it suitable for use with single or double cell dry batteries or with Li-Ion batteries. The output voltage can be set between 1.8V and 5.0V. The switching frequency is 1.2 MHz and the change over from PFM to PWM is set to 13% typical. Operation is in PWM under heavy load with duty cycles up to 88% (plus or minus 6%) and in PFM under moderate to small load.

The switching regulator employs a soft start function over typical 1.2ms. An intelligent STU-Mode Circuit supports the step-up of the output voltage for a given Start-Up period with a fixed duty cycle; it is shut down during operation for power saving. Current consumption is very dependent on the operating modus and load; it is typ. 95 microA during switching stop and 3.0 microA with power off pin set to OFF. Efficiency is 85%. The control circuit permits the use of low ESR ceramic capacitors at the output. The IC contains an over-current detection circuit to protect coil and switching regulator.

More information in the datasheet:


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