TEA1211HN

General description

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.

Features

• I²C-bus programmable output voltage range of 1.5 V to 5.5 V
• Single inductor topology
• High efficiency up to 94 pct over wide load range
• Wide input range; functional from 2.55 V up to 5.5 V
• 1.7 A maximum input and output current
• Low quiescent power consumption
• 600 kHz switching frequency
• Four integrated very low R_DS(on) power MOSFETs
• Synchronizable to external clock
• Externally adjustable current limit for protection and efficient battery use in case of dynamic loads
• Under voltage lockout
• PWM-only option
• Shut-down current less than 1 uA
• 32-pin small body HVQFN package.

Applications

• Stable output voltage from Lithium-Ion batteries
• Variable voltage source for PAs (Power Amplifiers) in cellular phones
• Wireless handsets
• Hand-held instruments
• Portable computers.

Block diagrams/pinning

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