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Automotive Buck/Buck-Boost Pre-Regulator with Synchronous Buck and Multiple LDO Regulators

A4411

Product Image A4411

The A4411 offers a comprehensive power management solution for automotive applications, integrating a buck or buck-boost pre-regulator, a synchronous buck regulator, and multiple LDOs. It features a programmable watchdog timer, power-on reset, and fault protection for robust performance.

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Top Features

Packaging

Typical Applications

  • Automotive AEC-Q100 qualified
  • 3.5 to 36 VIN operating range, 40 VIN maximum
  • Buck or buck-boost pre-regulator (VREG)
  • Adjustable PWM switching frequency: 250 kHz to 2.4 MHz
  • PWM frequency can be synchronized to external clock
  • Synchronous buck regulator (ADJ) delivers 0.8 to 3.3 V
  • Two 5 V LDOs for “local” sensors (V5SNR) and communications (V5CAN) with foldback short-circuit protections
  • 5 V internal tracking LDO for remote sensors with fold back short circuit and short-to-battery protections (V5P)
  • TRACK sets FBADJ or V5SNR as the reference for V5P
  • Programmable pulse-width window watchdog (PWWD) with scalable activation delay and selectable tolerance
  • Internal Watchdog (WD) CLK with ±5% accuracy
  • Accepts external WD CLK for improving accuracy
  • Active-Low Watchdog Enable pin (WDENn)
  • Dual bandgaps for increased reliability: BGVREF, BGFAULT
  • Power-on reset (NPOR) with fixed delay of 2 ms
  • Power OK output for 5 V LDOs UV/OV (POK5V)
  • Logic enable input for microprocessor control (ENB)
  • High-voltage ignition enable input (ENBAT)
  • ENBAT status indicator output (ENBATS)
  • SLEW rate control pin helps reduce EMI/EMC
  • Frequency dithering helps reduce EMI/EMC
  • OV and UV protection for all four CPU supply rails
  • Pin-to-pin and pin-to-ground tolerant at every pin
  • Thermal shutdown protection
  • -40°C to 150°C junction temperature range

The A4411 is supplied in a low-profile 38-lead eTSSOP package (suffix “LV”) with exposed power pad.

LV Package Documentation

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Part Number Specifications and Availability

Documentation and Resources

Design Support Tools

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