A4407集成电路（IC）的线性稳压器控制器规格书PDF中文资料

A4407属于集成电路（IC）的线性稳压器控制器。由Allegro MicroSystems制造生产的A4407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 A4407 is an automotive power management IC that uses a 2.2 MHz constant on-time (COT) buck pre-regulator to supply a 5 V linear regulator, a 5 V tracking/protected linear regulator, a 3.3 V linear FET controller/driver, and a 1.2 V/1.5 V/1.8 V linear FET controller/driver. The A4407 provides a pin to set the master reference for the 5 V tracking regulator to either the 3.3 V or the 5 V output. The on-time of the buck is internally adjusted as a function of VINto maintain the 2.2 MHz switching frequency. Efficient operation is achieved by using the buck pre-regulator to drop the input voltage before supplying the linear regulators. Designed to supply CAN and microprocessor power supplies in high temperature environments, the A4407 is ideal for under hood applications.

Features and Benefits

• AEC Q100 Grade 0 qualified

• Internal buck pre-regulator followed by LDO outputs

• 5.5 to 36 V V

IN operating range (50 V maximum);

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

• Constant on-time (COT) buck pre-regulator

• Valley current sensing achieves shortest buck on-times

• 2.2 MHz (VIN- adjusted) switching frequency

• 5 V internal low-dropout tracking linear regulator with

foldback short circuit and short-to-battery protections

• 5 V internal low-dropout linear regulator with foldback

short circuit protection

• 3.3 V external FET controller/driver with programmable

current limit and foldback short circuit protection

• 1.2 V/1.5 V/1.8 V external FET controller/driver with

programmable current limit and foldback protection

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

• Logic enable input (ENB) for microprocessor control

• Ignition enable input (ENBAT) for remote startup

• Ignition status indicator (ENBATS) output

• Buck pulse-by-pulse overcurrent protection

• Buck LX short circuit protection (latched)

• Missing asynchronous diode protection (latched)

• UVLO for VIN, charge pump, and the internal rail

• Thermal shutdown protection

• −40ºC to 150ºC junction temperature range