MAX8989

Multimode PA Step-Down Converter with Linear Bypass Mode

Compact Package (1.6mm x 1.6mm) Powers Multimode PAs Efficiently to Extend Talk Time Up to 25% in Mobile Phones

Data Sheet (Rev. 1)
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Overview

  • PA Step-Down Converter
    • 25µs (typ) Settling Time for 0.4V to 3.2V Output Voltage Change
    • Dynamic Output Voltage Setting from 0.4V to VIN
    • 85mΩ pFET and 100% Duty Cycle for Low Dropout
    • 2MHz Switching Frequency
    • Low Output Voltage Ripple
    • 2% Output Voltage Accuracy Over Load, Line, and Temperature
    • Tiny External Components
  • 2.5A Output Current Capability
  • Simple Logic On/Off Control
  • Low 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Thermal Overload Protection
  • 1.6mm x 1.6mm WLP Package (0.69mm max Height)

The MAX8989 step-down converter is optimized for powering the power amplifier (PA) in multistandard handsets such as LTE, WCDMA, GSM, and EDGE. The device integrates a high-efficiency PWM step-down converter for medium- and low-power transmission with an 85mΩ (typ) low dropout (LDO) bypass regulator, in parallel with the step-down converter, enabling high-power transmission.

The IC uses an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The bypass LDO powers the PA directly from the battery during high-power transmission or in case of insufficient headroom between the input and programmed output. The bypass LDO is enabled when the output voltage is greater than 1.0V. In the case where the output current exceeds the step-down converter current limit, the bypass LDO provides supplementary current to the output, ensuring a stable output voltage. The bypass LDO also provides a smooth transition between step-down regulation and operation in dropout.

The IC is available in a 9-bump, 1.6mm x 1.6mm WLP package (0.69mm max height).

Applications

  • LTE, WCDMA, GSM, and EDGE Cell Phones/Smartphones
MAX8989
Multimode PA Step-Down Converter with Linear Bypass Mode
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 2
MAX8805
600mA/650mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power
MAX8896
LAST TIME BUY Dual PWM Step-Down Converter in a 2mm x 2mm Package for WCDMA PA and RF Power
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Evaluation Kits

MAX8989EVKIT

Evaluation Kit for the MAX8989

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Features and Benefits

  • PA Step-Down Converter
    • 25µs (typ) Settling Time for 0.4V to 3.2V Output-Voltage Change
    • Dynamic Output-Voltage Setting from 0.4V to VIN
    • 85mΩ PFET and 100% Duty Cycle for Low Dropout
    • 2MHz Switching Frequency
    • Low Output-Voltage Ripple
    • 2% Output-Voltage Accuracy Over Load, Line, and Temperature
    • Tiny External Components
  • 2.5A Output-Current Capability
  • Simple Logic On/Off Control
  • Low 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Thermal-Overload Protection
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX8989 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX8989 step-down converter with linear bypass regulator. The EV kit operates from a 2.7V to 5.5V power supply or battery. The output regulates to twice the voltage at REFIN (0.2V to 1.7V) and provides up to 2.5A drive capability.

Applications

  • LTE, WCDMA, GSM, and EDGE Cell Phones/Smartphones
MAX8989EVKIT
Evaluation Kit for the MAX8989

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