MAX8989 Powers PA Modules in Mobile Phones

Maxim Integrated Products has introduced the MAX8989, a step-down converter designed to power power-amplifier (PA) modules in mobile phones. Said to be the first DC-DC converter in the industry to support power management for multiple communication protocols (LTE, WCDMA, GSM and Edge), the MAX8989 is suitable for converged multimode PAs. This solution is utilised in Infineon's Smarti UE2 RF engine platform, which delivers high flexibility and efficiency to multi-standard mobile phone systems.

The MAX8989 integrates a high-efficiency switching regulator with a parallel bypass LDO to guarantee maximum efficiency under all conditions. This approach enables designers to minimise the amount of power dissipated within the PA by regulating the PA's output-stage supply voltage. By controlling the PA supply voltage to meet transmission-power requirements, designers can extend 2G talk time by up to 25 per cent and 3G talk time by up to 10 per cent. The integrated LDO serves to smooth the transition between step-down regulation and operation in dropout, allowing for a seamless transition to higher power levels.

When in dropout, the LDO becomes a low-impedance bypass FET to ensure minimal power loss during periods of peak current demand. Additionally, the switching regulator is capable of a 100 per cent duty cycle to further eliminate losses. The MAX8989 supports up to 2.5A, making it suitable for powering GSM/Edge PAs. It is fully specified over the -40 to 85C extended temperature range and offered in a compact (1.6 x 1.6mm, 0.69mm max height), nine-bump wafer-level package (WLP).

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