HT77xxS 100mA PFM Synchronous Step-up DC/DC Converter
●General Description
■The HT77xxS 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 out-line 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 HT77xxS devices include an internal oscillator, PFM control circuit, driver transistor, reference volt-age 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 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23 pack-ages. For SOT23-5 package types, they also include an internal chip enable function to reduce power consumption when in the shutdown mode.
●Features
■Low start-up voltage: 0.7V (Typ.)
■High efficiency: 1.8V ≤ VOUT≤ 2.2Vupper 80%, 2.7V ≤ VOUT≤ 5.0V upper 85% (Typ.)
■High output voltage accuracy: ±2.5%
■Output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V,5.0V
■Output current up to 100mA
■Ultra low supply current IDD: 4μA (Typ.)
■Low ripple and low noise
■Low shutdown current: 0.1μA (Typ.)
■Package types: 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23
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HT77xxS 、 HT7718S 、 HT7722S 、 HT7727S 、 HT7730S 、 HT7733S 、 HT7737S 、 HT7750S |
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[ Palmtops ][ PDAs ][ Portable communicators ][ Smartphones ][ Cameras ][ Camcorders ][ Battery-powered equipment ] |
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Datasheet |
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Please see the document for details |
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SOT89;SOT23;SOT23-5 |
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English Chinese Chinese and English Japanese |
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December 12, 2018 |
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Rev. 1.70 |
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1.6 MB |
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