Holtek HT77xx PFM Asynchronous Step-up DC to DC Converter (100mA)


Product Overview

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.


· Palmtops/PDAs
· Portable communicators/Smartphones
· Cameras/Camcorders
· Battery-powered equipment


· 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



PFM step-up DC/DC converter 3.3V, 5-pin SOT23 package


You may also like…

Holtek HT77xxA PFM Step-up DC/DC Converter

From£0.20(Ex. VAT)

Enquire about this product

Ask our experts

Feel free to speak to us about any of our services or what else we may be able to provide your business.

You can call us on a href="tel:01527830800">01527 830800 or message us below.

Error: Contact form not found.

Secure Payments