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Analog Devices Inc. MAX20428 Eight-Output Mini PMICs

Analog Devices MAX20428 Eight-Output Mini PMICs are high-efficiency, eight-output, low-voltage PMICs designed for Advanced Driver-Assistance Systems (ADAS) applications. The OUT1 increases the input supply to 5V at up to 500mA, while three synchronous step-down converters function from an input voltage range of 3.0V to 4.2V and deliver an output voltage range of 0.8V to 3.9875V at up to 1.3A peak, 1.3A peak, and 3.5A peak, respectively. Furthermore, three 300mA pMOS LDOs work from an input voltage range of 2.7V to 5.5V and supply an output voltage of 0.8V to 3.9875V. A soft-start, 25mΩ load switch is also included. All regulated outputs accomplish ±1.5% DC accuracy over load, line, and temperature range.

The Analog Devices MAX20428 Eight-Output Mini PMICs feature a 2.1MHz fixed-frequency PWM mode for improved noise immunity and load-transient response. The 2.1MHz frequency operation enables the use of all ceramic capacitors and minimizes external components. The programmable spread-spectrum frequency modulation reduces radiated electromagnetic emissions. The integrated low RDS(ON) switches enhance efficiency at heavy loads and facilitate the layout concerning discrete solutions.

Features

  • Multiple functions for small sizes
    • Synchronous 5V, 500mA boost converter
    • Dual 1A synchronous buck converters
      • 0.8V to 3.9875V in 12.5mV steps
      • 1.3A peak output capability
    • Single 3A synchronous buck converter
      • 0.8V to 3.9875V in 12.5mV steps
      • 3.5A peak output capability
    • Three 300mA low-dropout linear regulators
    • One 25mΩ load switch
    • Programmable challenge/response watchdog
    • I2C fast-mode plus compatible interface with Packet-Error Checking (PEC) option
    • 2.1MHz internal operation with spread-spectrum (SS) option
  • High-precision performance
    • ±1.5% output voltage accuracy
    • ±1% OV/UV monitoring
    • Excellent load-transient performance
  • Diagnostics and redundant circuits
    • ASIL C compliant
    • Redundant reference
    • Fail-safe on open pins
    • Shorted pin detection on RESET
    • PV supply OV/UV monitor
  • Robust for the automotive environment
    • Current-mode, forced-PWM operation
    • Overtemperature and short-circuit protection
    • 5mm x 5mm, 28-pin, side-wettable TQFN
    • -40°C to +125°C grade 1 automotive temperature range

Simplified Block Diagram

Block Diagram - Analog Devices Inc. MAX20428 Eight-Output Mini PMICs
Publicado: 2025-07-06 | Actualizado: 2025-07-15