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100mA PFM Synchronous Step-up DC/DC Converter
( TO92 Package 限用產品 公告日: 2018/12/18 生效日: 2019/03/18)
(TO92 Package 產品終止信息)

The HT7737S devices are a high efficiency PFM synchronous step-up DC-DC converter series which are designed to operate with both wire wound chip power inductors and also with multi-layered chip power inductors. The device series have the advantages of extremely low start-up voltage as well as high output voltage accuracy. Being manufactured using CMOS technology ensures ultra low supply current. Because of their higher operating frequency, up to 500 kHz, the devices have the benefits of requiring smaller outline type lower value external inductors and capacitors. The higher operating frequency also offers the advantages of much reduced audio frequency noise. The devices require only three external components to provide a fixed output voltage of 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V or 5.0V.

The HT7737S devices include an internal oscillator, PFM control circuit, driver transistor, reference voltage unit and a high speed comparator. They employ pulse frequency modulation techniques, to obtain minimum supply current and ripple at light output loading. These devices are available in space saving SOT89, SOT23 and SOT23-5 packages. For SOT23-5 package types, they also include an internal chip enable function to reduce power consumption when in the shutdown mode.