Step-down converter with linear bypass supports multimode PAs in mobile handsets
February 18, 2011 // Paul Buckley
Maxim Integrated Products has introduced a step-down converter designed to power PA (power amplifier) modules in mobile phones. The company claims the MAX8989 is first DC-DC converter in the industry to support power management for multiple communication protocols (e.g., LTE, WCDMA, GSM, and EDGE).
The device is ideal for converged (multimode) PAs which is a solution utilized in Infineon’s proven SMARTi UE2 RF engine platform, which delivers unparalleled flexibility and efficiency to multistandard cellular phone systems.
The MAX8989 integrates a high-efficiency switching regulator with a parallel bypass LDO to guarantee maximum efficiency under all conditions. The approach enables designers to minimize 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% and 3G talk time by up to 10%.
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 (85 milliohm) bypass FET to ensure minimal power loss during periods of peak current demand. Additionally, the switching regulator is capable of a 100% duty cycle to further eliminate losses.
The MAX8989 supports up to 2.5 A, making it an excellent choice for powering GSM/EDGE PAs. The device is fully specified over the -40 to +85 degrees Celsius extended temperature range, and offered in a compact (1.6 mm × 1.6 mm, 0.69 mm max height), 9-bump wafer-level package (WLP). Prices start at $1.92 (1000-up, FOB USA). Samples and evaluation kits are available upon request.
More information about the MAX8989 step-down converter at
Visit Maxim Integrated Products at www.maxim-ic.com
Imagination positions itself for 802.11ah for the Internet of Things
July 24, 2014
Imagination Technologies has developed a low power configurable radio architecture for the wide range of existing and emerging ...
Smartwatches suck, says Pebble backer
Broadcom cuts 2,500 jobs to exit cellular market
Photographic method to survey magnetic field
Signal Integrity guru puts comprehensive SI training online
Failed merger talks won't stop Dialog
July 23, 2014
AMS, formerly known as Austriamicrosystems, and Dialog Semiconductor couldn't agree the terms of a merger, which feels like ...
Peregrine Semiconductor and RF Micro Devices settle all litigation
Atomic clock based on a chip-scale frequency comb
RFID tags track honey bees
- Testing GPS with a Simulator
- DSM presents: Select the best plastic for DDR4
- Dual 13A μModule Regulator with Digital Interface for Remote Monitoring & Control of Power
- Exploring the Business Model Evolution of High-Tech Equipment Manufacturers
InterviewCEO interview: China, not Apple, is way to go, says mCube CEO
Ben Lee, CEO of MEMS startup mCube, explains why he wants to spend $37 million on being a supplier of sensors to Chinese ODMs and avoiding a design win with Apple or Samsung.
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Altium Ltd is offering EETimes Europe's readers the chance to win one TASKING VX-Toolset for ARM Cortex-M Premium Edition, normally licensed for 2.395 Euros, for ultra-rapid prototyping and code development around ARM Cortex-M based microcontrollers.
The VX-toolset for ARM is the first TASKING compiler suite to receive the Software Platform technology, which is seamlessly...Read more
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.