MAX8561

4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN

First 4MHz Step-Down DC-DC Converters Deliver 500mA with Over 90% Efficiency in SOT23 and TDFN

Data Sheet (Rev. 2)
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Part Details

  • Up to 4MHz PWM Switching Frequency
  • 500mA Guaranteed Output Current
  • 40µA (typ) Quiescent Current
  • Adjustable Output Voltage from 0.6V to 2.5V
  • Logic-Controlled Output Voltage (MAX8561)
  • Drives External Bypass FET (MAX8562)
  • ±1.5% Initial Accuracy
  • Soft-Start Eliminates Inrush Current
  • Fast Voltage-Positioning Transient Response
  • Internal Synchronous Rectifier
  • 2.7V to 5.5V Input
  • 0.1µA Logic-Controlled Shutdown
  • Thermal Shutdown
  • Thin SOT23 or Space-Saving 3mm x 3mm x 0.8mm TDFN Packages
MAX8561
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN
MAX8560, MAX8561, MAX8562: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

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Hardware Ecosystem

Parts Product Life Cycle Description
Internal Power Switch Buck Regulators 2
MAX1920
PRODUCTION Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
MAX1921
PRODUCTION Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
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Evaluation Kits

MAX8561EVKIT

Evaluation Kit for the MAX8561, MAX8562

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Features and Benefits

  • 2.7V to 5.5V Input Voltage Range
  • 0.6V to 2.5V Adjustable Output Voltage Range
  • VOUT1 = 1.8V/1.5V at 500mA (MAX8561)
  • VOUT2 = 1.2V at 400mA or Bypass Mode (MAX8562)
  • 2MHz PWM Switching Frequency (MAX8561)
  • 4MHz PWM Switching Frequency (MAX8562)
  • 0.1µA (typ) Shutdown Current
  • Surface-Mount Construction
  • Fully Assembled and Tested

Product Details

The MAX8561 evaluation kit (EV kit) demonstrates the MAX8561/MAX8562s' up to 4MHz pulse-width modulated (PWM) step-down DC-DC converters. The two circuits are optimized for powering the DSP/microprocessor or the power amplifiers (PAs) in wireless applications. The MAX8561 circuit provides two adjustable output voltages in the 0.6V to 2.5V range from a 2.7V to 5.5V input, and can deliver 500mA of load current. In comparison, the MAX8562 circuit provides an adjustable voltage in the 0.6V to 2.5V range and a bypass mode where the output voltage is shorted to the input by an external MOSFET.

Applications

  • CDMA/RF Power-Amplifier Supplies
  • Cell Phones/Smartphones
  • Microprocessor/DSP Core Supplies
  • PDAs, DSC, and MP3 Players
MAX8561EVKIT
Evaluation Kit for the MAX8561, MAX8562

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