DC-DC Converter Modules

Holtek HT77xx

PFM Asynchronous Step-up DC to DC Converter (100mA) The HT77xx series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They 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. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells. The HT77xx consists of an oscillator, a PFM control circuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for 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 packages. For 5-pin SOT23 package, it also build-in a chip enable function to reduce power consumption during shutdown mode. Applications · Palmtops/PDAs · Portable communicators/Smartphones · Cameras/Camcorders · Battery-powered equipment

Features

· Low start-up voltage: 0.7V (Typ.), 0.9V (Max.) · High efficiency: 85% (Typ.), VOUT³2.7V · 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 IDD2: 4mA (Typ.) · Low ripple and low noise · Low shutdown current: 0.5mA (Typ.) · 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23 package

Holtek HT77xxA PFM Step-up DC/DC Converter

The HT77xxA series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage of 2.7V, 3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells. The HT77xxA consists of an oscillator, a PFM control circuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for 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 packages. For 5-pin SOT23 package, it also build-in a chip enable function to reduce power consumption during shutdown mode Applications Palmtops/PDAs Portable communicators/Smartphones Cameras/Camcorders Battery-powered equipment

Features

Low start-up voltage: 0.7V (Typ.) High efficiency: 85% (Typ.) High output voltage accuracy: 2.5% Output voltage: 2.7V, 3.0V, 3.3V, 5.0V Output current up to 200mA Ultra low supply current IDD: 5 A (Typ.) Low ripple and low noise Low shutdown current: 0.5 A (Typ.) Package types: 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23 package

Overview coming soon - Call 01527 830800 for information

Count on the DVETR for maximum functionality in a minimal, board space-saving size. The DVETR offers DC-DC power conversion, EMI filtering, and transient voltage spike suppression in a single, small, hermetic package

Features

15V to 50V input range with 80V transient 3.3V, 5V, 5.2V, 5.7V, 12V and 15V single outputs available Up to 40W output power Full performance over -55°C to +125°C case military temperature range Very low output noise Fault tolerant design with patented technology – no optoisolaters Low profile (.455?) and light weight (56/60g) hermetic package 500Vdc input/output isolation Ensure excellent thermal performance and unit isolation by using with thermal pad TP-004

Overview coming soon - Call 01527 830800 for information