TinyPower™ 200mA synchronous step-up converter

The HT77xxFA series is a set of synchronous step-up DC/DC converters with high efficiency. The series devices have the advantage of extremely low start-up voltage, which is suitable for 1-cell Alkaline battery applications. Being manufactured using CMOS technology ensures ultra low supply current to extend power endurance for portable products. The devices require only three external components to provide a fixed output voltage of 2.7V, 3.0V, 3.3V, 3.7V or 5.0V.

In order to save PCB layout area, these devices are using synchronous topology integrated schottky diode, and also using 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23 packages. For 5-pin SOT23 package type, it also includes an internal chip enable function to reduce power consumption in the shutdown mode.

Features:

• ultra low supply current : 4μA
• low ripple and low noise
• high efficiency up to 95%
• fixed output voltage: 5.0V
• High output voltage accuracy: ±2%
• output current: Up to 200mA @ 0.6×VOUT≤VIN≤VOUT
• low shutdown current: 0.1μA (typ.)
• package types: 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23

Specification:

• input voltage: 0.7V~6.0V
• output voltage: 5.0V
• output current: 0.2A
• switching frequency: -
• current limit: -
• accuracy: VOUT±2%
• shutdown current: 1.0μA
• operationn current: 4μA
• efficiency: 90%
• mode: PFM
• case: SOT23