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Automotive Buck/Buck-Boost Pre-Regulator with Dual 5V LDOs, Watchdog, and Reset

A4409

Product Image A4409

The A4409 provides a reliable power solution for automotive applications, integrating a buck or buck-boost pre-regulator, two 5V LDOs, a window watchdog timer, and power-on reset. Its wide input voltage range and programmable features offer design flexibility for underhood systems.

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Top Features

Packaging

Typical Applications

  • Automotive AEC-Q100 qualified
  • VIN operating range from 3 to 36 V, with 40 V maximum
  • Buck or buck-boost pre-regulator (VREG)
  • Adjustable PWM switching frequency: 250 kHz-2.4 MHz
  • PWM frequency can be synchronized to external clock
  • Two 5 V internal LDO regulators with foldback short-circuit protection
  • Power-on reset (NPOR) with fixed delay of 22.5 ms
  • Programmable window watchdog timer with a fixed activation delay of 30 ms
  • Active low, watchdog timer enable/disable pin (WDENn)
  • Dual bandgaps for increased reliability:
    • BG1 for VREG, 5V0, and VCP reference
    • BG2 for V5 reference, and VREG, 5V0, and VCP fault detection
  • Ignition-enable input (ENBAT)
  • Frequency dithering helps reduce EMI/EMC
  • Undervoltage protection for all output rails
  • Pin-to-pin and pin-to-ground tolerant at every pin
  • Thermal shutdown protection
  • −40°C to 150°C junction temperature range

The A4409 is supplied in a low profile (1.2 mm maximum height), 20-lead eTSSOP package (suffix “LP”) with exposed thermal pad.

LP Package Documentation

Provides System Power for (μC/DSP, CAN, sensors, etc.)
in Automototive Control Modules, such as:

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Part Number Specifications and Availability