Holtek Semiconductor HT79171
The HT79171 and HT79181 are synchronous step-up DC-DC converters. With a wide input range from 2.2V to 5.0V, the devices are suitable for portable li-battery based applications such as power banks. The devices are able to provide a continuous 2A/3A current output due to their ultra-low integrated RDSONs which is 25mΩ/45mΩ and 20mΩ/40mΩ for the main FET and synchronous FET respectively.| Part No. | HT79171 |
|---|---|
| Datasheet | HT79171 Download |
| Manufacturer |  Holtek Semiconductor |
| Description | 500kHz Synchronous Step-Up PWM Converter |
| Buy | Stock & Price |
FEATURES
● Input Voltage from 2.2V to 5.0V● Adjustable Output Voltage from 2.6V to 5.5V
● Guaranteed Continuous Output Capability: 2A/3A(HT79171/HT79181) with VOUT=5.0V and VIN=3.3V
● Internal Ultra-Low Power Switches: 25mΩ/45mΩ (HT79171) and 20mΩ/40mΩ (HT79181) at 5.0V output
● Up to 95% Efficiency
● Fixed PWM Switching Frequency: 500kHz
● Precision Feedback Reference Voltage: 0.6V (±1.5%)
● Ultra-Low Shutdown Current < 1μA
● Load Disconnect (VOUT=0V) and Fast Discharging to Ground during Shutdown
● Embedded Loop Frequency Compensation
● Programmable OCP Threshold via External Resistor, RCS
● Extensive Protection Functions: Soft-Start when Power-On/Enable (SS), Input Under Voltage Lockout (UVLO), Over Current Limit Protection (OCP), Over Temperature Protection (OTP), Output Over Voltage Protection (OVP) and Output Short Protection without Heating (OSP)
● Package Types: 10-pin QFN and 8-pin SOP-EP
APPLICATIONS
● All Single Cell Li or Dual Cell Batteries● Portable Equipment
GENERAL DESCRIPTION
This greatly improves the efficiency and reduces the junction/case temperature.
