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New from Seiko Instruments is the ultra-small S-835X Series of PWM and PWM/PFM CMOS switching regulators.
The S-835X Series consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8355/57) and a PWM/PFM switching control circuit (S-8356/58).
The S-835X Series is available in four different packages including the ultra-small SNB6B which offers a 55% footprint reduction when compared with the SOT-23 package.
Oscillation frequencies of 100, 250 and 300kHz are available.
The S-835X Series switching regulators are ideal for a wide range of applications, including digital cameras, notebook PCs, PDAs, portable audio devices, video cameras and communication equipment.
The S-8355/57 Series attains low ripple, high efficiency and excellent transient characteristics with the PWM control circuit.
The S-8356/58 Series switches its operation to the PFM control circuit with the PWM/PFM switching control circuit under light loads to provide high efficiency over all load conditions.
The S-835X Series features low operation current consumption of 25.9A (3.3V, 100kHz, typical), soft start function and shutdown function.
Engineers can select output voltages from 1.5 to 6.5V in 0.1V steps for the E, G, and J models and from 2.0 to 6.5V in 0.1V steps for the B, H, F, K, L and M models.
Duty ratios are 0 to 83% (0-78% for 250 and 300kHz models) for the S-8355/57 and 15 to 83% (15-78% for 250 and 300kHz models) for the S-8356/58.
The S-835X Series is available now and is priced at $0.36 each for the SNB6B package and $0.35 for other package options in quantities of 10,000.
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