A4406KLPTR-T

• Product introduction

The A4406 is a carPower management ICs, which uses a 5.45 V high-frequency constant on-time preregulator to power an internal 5 V linear regulator and a 3.3 V linear DMOS driver. Designed to power CAN and microprocessor power in high-temperature environments, the A4406 is ideal for under-the-hood applications. Efficient operation can be achieved by using a buck preregulator to effectively reduce the input voltage before powering the linear regulator; This reduces power loss and increases the overall efficiency of the regulator.

The switching regulator is designed to operate at a nominal switching frequency of 2.2 MHz. The high switching frequency enables customers to select low-value inductors and ceramic capacitors while avoiding electromagnetic interference (EMI) in the AM band.

Protection features include undervoltage lockout and thermal shutdown. The V5P output is protected from short-to-battery applications. In the event of a load short, all regulators initiate overcurrent protection. The A4406 also features a power-on reset function with adjustable delay for microprocessor output.

The A4406 is available in a low profile (max.: 1.2 mm) 20-pin TSSOP package with exposed heat shield plate (suffix: LP). The package is lead (Pb) free and features 100% matte tin leadframe plating.

• AEC Q100 Class 0 compliant
• A built-in buck preregulator followed by a low dropout (LDO) output
• 5.5 to 36 V VIN operating range (max. 50 V); For start/stop, cold start, and load dump requirements
• 2.2 MHz constant on-time buck regulator
• 50 V absolute maximum input voltage to handle surges
• Valley current sensing achieves the shortest buck on-time
• 5.5 to 46 V input voltage range
• −40ºC to 150ºC junction temperature range
• Power-On reset with adjustable rise delay (NPOR pin)
• 5 V (V5P pin) with overcurrent foldback and short-to-battery protection with low dropout tracking linear regulator
• 3.3 V (V33-pin) external linear regulator DMOS driver with programmable current limit (up to 500 mA) and overcurrent foldback protection
• Logic Enable Input (ENB Pin)
• Ignition enable input (ENBAT pin)
• Ignition status indicator (ENBATS pin)
• Buck-pulse-by-pulse overcurrent protection
• Buck LX short-circuit protection (lockout)
• Lack of asynchronous diode protection (locking)
• Switch (VREG pin), 3.3V (V33 pin), and charge pump
• (VCP pin) Undervoltage lockout protection (UVLO)
• Thermal shutdown protection (TSD)