A4492中文资料Triple Output Step-Down Switching Regulator数据手册Allegro规格书

描述 Description

Designed to provide the power supply requirements for a wide range of applications, the A4492 provides three high current, high performance, switching regulator outputs with independent soft start.

High frequency switching allows selection of inexpensive inductors and small ceramic output capacitors. The turn-on cycles of the regulators are interleaved to minimize stresses on the input capacitors and to reduce EMI. A charge pump is used to provide the supply for driving the power switches, ensuring operation at very wide operating duty cycles and avoiding the need for power-draining clamp circuits.

A power-on-reset circuit with user configurable delay indicates when enabled regulators are in specification. The power-onreset flag also indicates when the input voltage drops below specification, giving the system controller advance warning while the switchers continue to operate down to the shutdown level.

Internal diagnostics provide comprehensive protection against overloads, input undervoltages, and overtemperatures.

The A4492 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currentlyrestricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available.

Date of status change: July 1, 2019.

Deadline for receipt of LAST TIME BUY orders: December 27, 2019.

Recommended Substitutions: A4490.

特性 Features

• Three buck converters
• 4.5 to 34 V input voltage range
• 550 kHz fixed frequency
• Multiphase switching
• Independent control of each converter
• Power-on-reset flag
• Internal compensation
• 4 × 4 mm QFN Package, small PCB footprint
• RoHS compliant

简介

A4492属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的A4492稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。