APEK4405KLP-01-MH

• Product Introduction

The A4405 is an automotive power management IC that uses a 5.45 V high-frequency constant on-time preconditioner to power two built-in 5 V linear regulators and a 3.3 V linear DMOS driver. The A4405 is designed to power CAN and microprocessor power in high-temperature environments and is ideal for under-the-hood applications. Efficient operation can be achieved by using a step-down preconditioner to effectively reduce the input voltage before powering the linear regulator; This reduces power loss and increases the total 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 choose between low-value inductors and ceramic capacitors while avoiding electromagnetic interference (EMI) in the AM frequency band.

Protection features include undervoltage lockout and overheat shutdown. The V5P output is protected from battery short circuits. In the event of a load short, all regulators will activate overcurrent protection.

The A4405 also features a power-on reset function with adjustable delay for microprocessor output. The A4405 is available in a low-profile (max: 1.2 mm) 20-pin TSSOP package with exposed thermal panel (suffix: LP). The package is lead-free and features a 100% matte tin-plated pinframe.

• 符合 AEC Q100 0 级标准的
• 内置降压预调节器后跟低压差 (LDO) 输出
• 5.5 到 36 V VIN 工作范围（最大 50 V）；用于启动/停止、冷启动、和负载突降需求
• 2.2 MHz 恒定导通时间降压稳压器
• 谷值电流传感实现了最短的降压导通时间
• 50 V 绝对最大输入电压，可应对浪涌
• 5.5 至 46 V 输入电压范围
• 40ºC 至 150ºC 的结温范围
• 带可调整上升延迟的上电复位（NPOR 引脚）
• 5 V（V5P 引脚）带过电流折返和电池短路保护的内置低压差跟踪线性稳压器
• 5 V（V5 引脚）带过电流折返保护的内置低压差线性稳压器
• 3.3 V（V33 引脚）带可编程电流限制（高达 500 mA）和过电流折返保护的外置线性稳压器 DMOS 驱动器
• 逻辑启用输入（ENB 引脚）
• 点火启用输入（ENBAT 引脚）
• 点火状态指示器（ENBATS 引脚）
• 降压逐脉冲过电流保护
• 降压 LX 短路保护（锁定）
• 缺失异步二极管保护（锁定）
• 开关（VREG 引脚）、3.3 V（V33 引脚）和电荷泵
• （VCP 引脚）欠压锁定保护 (UVLO)
• 过热关机保护 (TSD)