Functional Safety PMICs
Automotive Buck/Buck-Boost Pre-Regulator with Dual 5V LDOs, Watchdog, and Reset
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.
Product Details
Product Details
Top Features
- 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
