General Description
The XC9129 series is synchronous step-up DC/DC converters with a 0.2Ω (TYP.) N-channel driver transistor and a
synchronous 0.2Ω (TYP.) P-channel switching transistor built-in. A highly efficient and stable current can be supplied up to
1.0A by reducing ON resistance of the built-in transistors. With a high switching frequency of 1.2MHz, a small inductor is
selectable so that the series are ideally suited for the applications requiring low profile limitation or space-saving. With the
MODE pin, the series provide mode selection of PWM control or PFM/PWM automatic switching control. In the PWM/PFM
automatic switching mode, the series enters from PWM to PFM to reduce switching loss when load current is small. When
load current is large, the series enters automatically to the PWM mode so that high efficiency is achievable over a wide range
of load conditions. The series provide small output ripple from light to large loads by using the built-in circuit which enables
the transition between PWM and PFM smoothly. When voltage higher than the input voltage is applied to the output during
shut-down, the input and the output are isolated and the IC allows parallel drive with such as AC adaptor.
Features
- Output Current : 150mA＠VOUT=3.3V, VIN=0.9V
500mA＠VOUT=3.3V, VIN=1.8V
- Input Voltage Range : 0.8V~6.0V
Output Voltage Setting Range: 1.8V~5.3V (Externally set)
- Oscillation Frequency : 1.2MHz (Fixed oscillation frequency accuracy ±15%)
- Input Current : 1.0A
- Maximum Current Limit : 1.2A (MIN.), 2.0A (MAX.)
Applications
- Digital audios
- Digital cameras, Video equipments
- PC Mouses
- Various multi-function power supplies using alkali cell (1 to 3 cell), nickel hydride batteries, or lithium cell (1 cell)
Typical Application Circuit
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