MAX20021 Low-Voltage Step Down DC-DC Converters

By Maxim Integrated 63

MAX20021 Low-Voltage Step Down DC-DC Converters

Maxim’s MAX20021 family of power management integrated circuits (PMICs) integrates four low-voltage, high-efficiency, step-down DC-DC converters. The four outputs are resistor programmable between 1.0 V to 4.0 V and can provide up to 1.0 A. The PMICs operate from 3.0 V to 5.5 V, making them ideal for point-of-load and post regulation applications.

High-frequency operation allows for an all-ceramic capacitor design and small sized external components. Internal current sensing and loop compensation allows for reduced board space and system cost.

The PMICs offer several important protection features including input overvoltage protection, input undervoltage monitoring, input undervoltage lockout, cycle-by-cycle current limiting, and overtemperature shutdown. The input undervoltage monitor indicates a brownout condition by driving PG_ low when the input falls below the UVM threshold.

Features
  • Quad step-down DC-DC converters with integrated FETs
  • Operate from 3.0 V to 5.5 V supply voltage
  • Designed to improve automotive EMI performance
    • Forced-PWM operation
    • Two channels 180° out-of-phase
    • SYNC input
    • Spread-spectrum option
  • 2.2 MHz (MAX20022) or 3.2 MHz (MAX20021) switching frequency
  • Four channels capable of delivering up to 1 A each
  • Soft-start and supply sequencing reduces inrush current
  • Individual enable inputs and power-good outputs to simplify sequencing
  • OV/UV input-voltage monitoring
  • Overtemperature and short-circuit protection
  • 28-pin (5 mm × 5 mm × 0.8 mm) TQFN-EP package
  • -40°C to +125°C operating temperature range
  • 1.0 V to 4.0 V fixed or adjustable output voltage

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