Holtek Semiconductor HT7722B
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.| Part No. | HT7722B |
|---|---|
| Datasheet | HT7722B Download |
| Manufacturer |  Holtek Semiconductor |
| Description | 5V/100mA PFM Asynchronous Step-up Converter |
| Buy | Stock & Price |
FEATURES
● Low startup voltage: 0.85V (Typical)● High efficiency Up to 85%
● Ultra low no load input current
● 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
APPLICATIONS
● One, two and three cell alkaline and NiMH/NiCd bettery powered portable products● Portable equipment/handheld devices
GENERAL DESCRIPTION
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.
