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Integrated Cellular RF-Section Power-Management IC

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Three 100mA Low-Dropout Linear Regulators
  • Low 50mV Dropout Voltage at 100mA
  • ±1% Output Voltage Accuracy Over Temperature
  • Preset 1.8V to 3.3V Output Voltages (in 50mV Increments)
  • Low 45µVRMS Output Voltage Noise
  • Low 180µA Operating Supply Current
  • 2.5V to 5.5V Input Voltage Range
  • 67dB PSRR
  • 10µVP-P Channel-to-Channel Crosstalk
  • Short-Circuit Protection
  • Thermal Overload Protection
  • 0.01µA Shutdown Current
  • Tiny 12-Pin 4mm x 4mm QFN Package

Applications/Uses

  • CCD Imaging

Description

The MAX8890 is a power-management IC intended for cellular handsets using a single lithium-ion (Li+) cell battery with input voltages from +2.5V to +5.5V. The IC contains three identical, low-noise, low-dropout (LDO) linear regulators to provide all of the supply voltage requirements for the RF portion of the handset.

The first LDO is intended to power the transmitter, receiver, and synthesizer. The second LDO is intended to power the TCXO, and high-power voltage-controlled oscillators (VCOs). The third LDO is intended to power the UHF offset VCO.

Each LDO has its own individual enable (ON/active-low OFF) control to maximize design flexibility. The reference is powered on if any of the enable inputs (EN1, EN2, EN3) are logic high. The high-accuracy output voltage of each LDO is preset at an internally trimmed voltage (1.8V to 3.3V in 50mV increments). Each LDO is capable of supplying 100mA with a low 50mV dropout and is optimized for low noise and high crosstalk-isolation. Designed with internal P-channel MOSFET pass transistors, the MAX8890's low 180µA operating supply current is independent of load.

Other features include short-circuit and thermal overload protection. The MAX8890 is available in a compact, high-power, 12-pin 4mm x 4mm QFN package with a metal pad on the underside.

Simplified Block Diagram

MAX8890: Typical Operating Circuit MAX8890: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .