93% efficient step-up voltage dc/dc converter from Holtek

Holtek has introduced the HT77S1x, a new series of 93% efficient (max) boost type DC/DC converter devices delivering 1A of output current at output voltages of 3.3V and 5V.

The key features of the HT77S1x devices are,

Using CMOS technology and PFM design techniques, can achieve DC/DC conversion efficiencies up to 93%
Low start-up voltage of 0.7V (Typ.)
High efficiency of HT77S10 is 91% (Typ.) at IOUT=200mA, VIN=2.4V, VOUT=3.3V
High output voltage accuracy of ±4%
Output voltage of 3.3V, 5.0V or Adjustable
Low ripple and low noise
20uA (Typ.) of ultra low supply current
1uA (Max.) of low shutdown current
Built-in voltage detector

The fixed 3.3V and 5V voltage outputs of the HT77S1x are obtained by connecting the FB pin to either VOUT or GND. Other output voltages in a range of 1.8V to 5.5V can be generated by connecting an external resistor divider circuit.

Holtek says that the new HT77S1x series subdivides into two categories according to their current drive capabilities. These are NMOS current drive limits of 1A current limit for the HT77S10 and 0.65A for the HT77S11. When the input voltage is 2V and output voltage is 3.3V, the HT77S10 can supply 350mA output current while the HT77S11 can supply 300mA.

Package: MSOP8 and SOP8 package
Availability: Now

For more details visit www.holtek.com