January 17, 2000
Sanken Introduces a New Series (SI-3000LS) of Surface-Mount Series Regulator ICs for Local Power Supplies Used in PCs, PC Monitors, and Video Games
Sanken Electric launched this January sample shipment of its new SI-3000LS-series regulator ICs with a 1-A output capacity. The devices, packed in a surface-mount SOP-8 package, provide on-board local power supplies for PCs, PC monitors, video games, and other devices.
The SI-3000LS Series delivers voltages even lower than those of DC/DC converters (3.3 or 5 V) found in the main power supplies for electronic devices: i.e., 1.8 V, 2.5 V, and 3.3 V (SI-3018LS/3025LS/3033LS, respectively).
Priced at ¥100 per sample, volume production of the new series will commence in late January. Annual sales of 20 million units are projected in the immediate plan.
♦Background
CPUs and other digital ICs are used in today's PCs, monitors, video games, and other electronic devices. With the recent power-saving trend, their driving voltages are dropping year by year. However, the low-voltage trend is not converging on a single, specific voltage, but rather on several different voltages.
CPUs and other central logic devices are usually supplied from the main power supply based mainly on the DC/DC converter. In contrast, the video chips, DSP chips, and other digital ICs operating on different supply voltages are often supplied from local power sources with relatively low capacities. The SI-3000LS Series is designed primarily to provide voltage-division local power supplies implemented on logic boards.
♦Small Surface-Mount SOP-8 Package
The SI-3000LS Series integrates power transistors and a controller chip within a single SOP-8 surface-mount package that requires half the footprint of the conventional TO-252 package. The series regulator demands a relatively low component count by its nature. In order to keep the voltage-division power supply stable, a low input/output voltage difference is secured at a 1-A load current.
♦Features
| (1) | Available in 1.8 V, 2.5 V, and 3.3 V supply voltages. Other supply voltages including 3 V are also planned in order to make low-voltage digital IC applications easier. |
| (2) | Low input/output voltage difference (0.8 V under max. load) is achieved at 1-A load current. |
| (3) | Output On/Off control capability cuts off the maximum current consumption to 1µA in standby mode, significantly reducing the system's standby power requirement. |
| (4) | Internal overcurrent and overheat protection. |
