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MAX8805Z

Maxim Integrated Products
Part Number MAX8805Z
Manufacturer Maxim Integrated Products
Description PWM Step-Down Converters
Published May 15, 2007
Detailed Description 19-0777; Rev 0; 4/07 600mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power General Description The MAX8805...
Datasheet PDF File MAX8805Z PDF File

MAX8805Z
MAX8805Z

Overview
19-0777; Rev 0; 4/07 600mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power General Description The MAX8805Y/MAX8805Z high-frequency step-down converters are optimized for dynamically powering the power amplifier (PA) in WCDMA or NCDMA handsets.
The devices integrate a high-efficiency PWM step-down converter for medium- and low-power transmission, and a 60mΩ typical bypass FET to power the PA directly from the battery during high-power transmission.
Dual 200mA low-noise, high-PSRR low-dropout regulators (LDOs) for PA biasing are also integrated.
Two switching frequency options are available—2MHz (MAX8805Y) and 4MHz (MAX8805Z)—allowing optimization for smallest solution size or highest efficiency.
Fast switching allows the use of small ceramic 2.
2µF input and output capacitors while maintaining low ripple voltage.
The feedback network is integrated, further reducing external component count and total solution size.
The MAX8805Y/MAX8805Z use an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment.
At high duty cycle, the MAX8805Y/MAX8805Z automatically switch to the bypass mode, connecting the input to the output through a low-impedance (60mΩ typ) MOSFET.
The www.
DataSheet4U.
com user can also enable the bypass mode directly through a logic-control input.
The LDOs in the MAX8805Y/MAX8805Z are designed for low-noise operation (35µVRMS typ).
Each LDO is individually enabled through its own logic control interface.
The MAX8805Y/MAX8805Z are available in a 16-bump, 2mm x 2mm WLP package (0.
7mm max height).
Features ♦ PA Step-Down Converter 7.
5µs (typ) Settling Time for 0.
8V to 3.
4V Output Voltage Change Dynamic Output Voltage Setting from 0.
4V to VBATT 60mΩ pFET and 100% Duty Cycle for Low Dropout 2MHz or 4MHz Switching Frequency Low Output-Voltage Ripple 600mA Output Drive Capability 2% Maximum Accuracy Tiny External Components ♦ Dual Low-Noise LDOs Low 35µVRMS (typ) Output Noise High 70dB (typ) PSR...


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