A4405集成电路（IC）的线性稳压器控制器规格书PDF中文资料

A4405属于集成电路（IC）的线性稳压器控制器。由Allegro MicroSystems制造生产的A4405稳压器 - 线性 + 开关此产品族中的产品用于构建执行 DC-DC 转换或电压调节功能的电路，采用的是开关模式和线性稳压器功能的组合。虽然具体的拓扑各不相同，但此类产品的主要目的是将开关模式技术的效率优势与线性稳压技术的低噪声特性结合在一起。

描述 Description

The A4405 is an automotive power management IC that uses a high frequency constant on-time 5.45 V pre-regulator to supply two internal 5 V linear regulators and a 3.3 V linear DMOS driver. Designed to supply CAN and microprocessor power supplies in high temperature environments, the A4405 is ideal for under hood applications. Efficient operation is achieved by using a buck pre-regulator to efficiently drop the input voltage

before supplying the linear regulators; this reduces power dissipation and increases overall regulator efficiency.

Features and Benefits

• AEC Q100 Grade 0 qualified

• Internal buck pre-regulator followed by LDO outputs

• 5.5 to 36 V VIN operating range (50 V maximum);

for start/stop, cold crank, and load dump requirements

• 2.2 MHz constant on-time buck regulator

• Valley current sensing achieves shortest buck on-times

• 50 V absolute maximum input voltage for surges

• 5.5 to 46 V input voltage range

• −40ºC to 150ºC junction temperature range

• Power-on reset (NPOR pin) with adjustable rising delay

• 5 V (V5P pin) internal low dropout tracking linear regulator with both overcurrent foldback and short-to-battery protection

• 5 V (V5 pin) internal low dropout linear regulator with overcurrent foldback protection

• 3.3 V (V33 pin) external linear regulator DMOS driver with a 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 (latched)

• Missing asynchronous diode protection (latched)

• Switcher (VREG pin), 3.3 V (V33 pin), and charge pump (VCP pin) undervoltage lockout protection (UVLO)

• Thermal shutdown protection (TSD)

Applications:

Automotive Control Modules, such as:

• Electronic power steering (EPS)

• Transmission control (TCU)

• Antilock braking (ABS)

• Emissions control