TEA1211HN

Notes
1. Human Body Model: equivalent to discharging a 100 pF capacitor via a 1.5 k resistor.
2. Machine Model: equivalent to discharging a 200 pF capacitor via a 0.75 H series inductor.

The TEA1211HN is a fully integrated auto-up/down DC/DC converter circuit with I2C-bus interface. Efficient, compact and dynamic power conversion is achieved using a digitally controlled pulse width and frequency modulation like control concept, four integrated low R_DS(on) power switches with low parasitic capacitances and fully synchronous rectification.

The combination of auto-up/down DC/DC conversion, high efficiency and low switching noise makes the TEA1211HN well suited to supply a power amplifier in a cellular phone. The output voltage can be I2C-bus programmed to the exact voltage needed to achieve a certain output power level with optimal system efficiency, thus enlarging battery lifetime.

The TEA1211HN operates at 600 kHz switching frequency which enables the use of small size external components. The switching frequency can be locked to an external high frequency clock. Deadlock is prevented by an on-chip under voltage lockout circuit. An adjustable current limit enables efficient battery use even at high dynamic loads. Optionally, the device can be kept in pulse width modulation mode regardless of the load applied.