Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8805Y and MAX8805Z
Edited by the Electronicstalk Editorial Team on 27 April 2007
Handset power chips optimise battery
efficiency
PWM step-down convertors in 2 x 2mm wafer-level packages are designed to power WCDMA/NCDMA power amplifiers in handset designs.
New from Maxim Integrated Products, the MAX8805Y and MAX8805Z are 600mA PWM step-down convertors in 2 x 2mm wafer-level packages (WLPs) for WCDMA/NCDMA power amplifiers (PAs) These devices optimise battery efficiency by integrating a high-efficiency step-down convertor for medium- and low-power transmission, as well as a 60mohm bypass FET that provides 1.5A of peak current
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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High efficiency and tiny packaging make the MAX8805Y/MAX8805Z ideal for multiband WCDMA/NCDMA applications, such as cellular handsets, wireless PDAs and smartphones.
Supporting 1.5A of peak current, the integrated 60mohm bypass FET provides maximum power with minimum dropout under even low-battery conditions.
Each device automatically enters bypass mode if the required output voltage is within 92% of the input voltage; or the user can force the IC into bypass mode using a simple logic input.
The output voltage is dynamically controlled using an external analogue input signal, which has a gain of 2V/V.
Additionally, the extremely fast 7.5us (typical) slew rate of the output voltage ensures plenty of margin to the CDMA-required maximum time of 50us.
The MAX8805Y and MAX8805Z also integrate two low-noise (35uV RMS), high-PSRR (70dB at 1kHz, typical) low-dropout regulators (LDOs), making them ideal for PA biasing or applications that require an exceptionally clean power source.
Each LDO features a separate on/off control, provides 3% (maximum) output accuracy, and requires only 10nF of output capacitance for loads of 10mA or less.
Output voltage options include combinations of 1.80, 2.5, 2.7, 2.8, 2.85 and 3.0V.
Other MAX8805Y and MAX8805Z features include overcurrent protection for the buck regulator and LDOs, overtemperature protection, and operation over the extended temperature range (-40 to +85C).
Available with either a 2MHz (MAX8805Y) or 4MHz (MAX8805Z) switching frequency, these devices provide the flexibility to optimise for size, cost or efficiency.
Both devices are available in lead-free, 16-bump, 2 x 2 x 0.7mm WLPs.
Prices start at US $1.75 (2500-up).
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