MAX8805X

600mA/650mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power

Small (4mm)² Package Provides Power and Bias to 2 WCDMA PA Modules

Data Sheet (Rev. 5)
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Overview

  • 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 (MAX8805Y/MAX8805Z) or 650mA (MAX8805W/MAX8805X) Output Drive Capability
    • 2% Gain Accuracy
    • Tiny External Components
  • Dual Low-Noise LDOs
    • Low 35µVRMS (typ) Output Noise
    • High 70dB (typ) PSRR
    • Guaranteed 200mA Output Drive Capability
    • Individual ON/OFF Control
  • Low 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Thermal Shutdown
  • Tiny 2mm x 2mm x 0.7mm WLP and UCSP Packages (4 x 4 Grid)

The MAX8805W/MAX8805X/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 for the MAX8805W/MAX8805Y and 4MHz for the MAX8805X/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 MAX8805W/MAX8805X/MAX8805Y/MAX8805Z use an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The REFIN to OUT gain is available in two options (2V/V for the MAX8805Y/MAX8805Z and 2.5V/V for the MAX8805W/MAX8805X). At high-duty cycle, the MAX8805W/MAX8805X/MAX8805Y/MAX8805Z automatically switch to the bypass mode, connecting the input to the output through a low-impedance (60mΩ typ) MOSFET. The user can also enable the bypass mode directly through a logic-control input.

The LDOs in the MAX8805W/MAX8805X/MAX8805Y/MAX8805Z are designed for low-noise operation (35µVRMS typ). Each LDO is individually enabled through its own logic control interface.

The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z are available in a 16-bump, 2mm x 2mm WLP and UCSP™ packages (0.7mm max height).

Applications

  • Smartphones
  • WCDMA/NCDMA Cellular Handsets
  • Wireless PDAs
MAX8805X
600mA/650mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power
MAX8805Y, MAX8805Z
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Documentation

Data Sheet 1

Technical Articles 1

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Evaluation Kits

MAX8805WEVKIT

Evaluation Kit for the MAX8805W/X/Y/Z

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Features and Benefits

  • PA Step-Down Converter
    • 7.5µs (typ) Settling Time for 0.8V to 3.4V Output-Voltage Change
    • Dynamic Output-Voltage Setting from 0.32V to VBATT
    • 60mΩ pFET and 100% Duty Cycle for Low Dropout
    • 2MHz or 4MHz Switching Frequency
    • Low Output-Voltage Ripple
    • 650mA Output Drive Capability (MAX8805W/MAX8805X)
    • 600mA Output Drive Capability (MAX8805Y/MAX8805Z)
    • 2% Maximum Accuracy
  • Dual Low-Noise LDOs
    • Low 35µVRMS (typ) Output Noise
    • High 70dB (typ) PSRR
    • Guaranteed 200mA Output Drive Capability
    • Individual ON/OFF Control
  • Tiny External Components
  • Low 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Thermal Shutdown
  • Tiny 2mm x 2mm x 0.7mm WLP Package (4 x 4 Grid)
  • Fully Assembled and Tested

Product Details

The MAX8805W evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that demonstrates the highly integrated MAX8805W stepdown DC-DC converter optimized for dynamically powering the power amplifier (PA) in WCDMA or NCDMA handsets. The MAX8805W EV kit can dynamically control the step-down output voltage in the 0.32V to VBATT range from a 2.7V to 5.5V input-voltage range, and delivers 650mA of load current in low-power mode. In high-power mode, the step-down output is directly connected to the input by the internal 60mΩ bypass pFET. Two low-noise LDOs are also integrated in the MAX8805W. The MAX8805W EV kit can also evaluate the MAX8805X/MAX8805Y/MAX8805Z. To evaluate the MAX8805X/MAX8805Y/MAX8805Z, order a free sample along with this EV kit.
MAX8805WEVKIT
Evaluation Kit for the MAX8805W/X/Y/Z

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