描述 Description

The AAT2608A is a member of AnalogicTech’s Total Power Management ICTM (TPMICTM) product family. It contains a fully integrated step-down converter and eight low dropout (LDO) regulators, making it ideal for general multiple rails applications.
The step-down converter is a 800mA synchronous converter which operates at a switching frequency of 1.5MHz, minimizing the size of external components while keeping efficiency greater than 90%. The step-down converter is capable of 1A of peak current and has an integrated compensation network. The input voltage range is 2.7V to 5.5V, and the output can be externally adjusted from 0.6V to 80% of the step-down converter's input voltage. It includes an independent enable to provide a convenient solution to implement any power up or power down sequencing.
The AAT2608A has eight high-PSRR LDOs which provides noise immunity to the generated power rails. The LDOs have independent enable pins to meet any power-up or power-down sequencing requirements. Each LDO requires a small output ceramic capacitor for stability. 5 of theLDOs have a fixed output which is programmed during manufacturing; 3 LDOs have adjustable outputs programmable with external resistors. LDOs 1, 2, 3 and 4 share the same input voltage as the step-down converter’s control circuitry. LDO5 shares its input with LDO6; LDO7 shares its input with LDO8.
The AAT2608A is available in the small 28-pin 4mm x 4mm TQFN package.

特性 Features

·1.5MHz Step-Down Converter
·800mA, Externally Adjustable
·Synchronous with Integrated Switches
·Independent Enable
·Independent Input Power and Ground
·Operating Input Voltage Range of 2.7V to 5.5V
·LDO1, LDO2, LDO3 and LDO4 Regulators Share Same Input as the Step-down Converter
·LDO5 and LDO6 are Tied to the Same Input
·LDO7 and LDO8 are Tied to the Same Input
·LDO1, LDO7 and LDO8 have Adjustable Outputs with External Resistors
·LDO2, LDO3, LDO4, LDO5 and LDO6 have Factory Programmed Outputs
·All LDOs have:
·Independent Enable
·300mA Current Capability
·High PSRR (68dB @10KHz)
·Low Ground Current (30μA)
·Over-Current Protection
·Over-Temperature Protection
·Operating Input Voltage Range from 2.7V to 5.5V
·TQFN44-28 Package