HT77xxB
5V/100mA PFM Asynchronous Step-up Converter
General Information
The HT77xxB series is a set of PFM step-up DC/DC converters with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only few external components to provide a fixed output voltage of 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V and 5.0V. CMOS technology ensures low supply current and makes them ideal for battery-operated applications powered from one or more cells.
The HT77xxB series consist 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 the 5-pin SOT23 package, it also contains a chip enable function to reduce power consumption during shutdown mode.
Feature Details
| Attribute | Value |
|---|---|
| Low startup voltage | 0.85V (Typical) |
| High efficiency Up to 85% | Available |
| Ultra low no load input current | Available |
| High output voltage accuracy | ±2.5% |
| Fixed output voltage | 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V and 5.0V |
| Ultra low shutdown current | 0.1μA (Typical) |
| Package type | 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23 |
Resources
| Title | Date | File Size | Language | Download |
|---|