Skyworks AAT2687

Description

The AAT2687 provides two independently regulated DC outputs; consisting of a high voltage step-down regulator and a low input voltage low dropout (LDO) regulator. The PMIC is optimized for low-cost 12V adapter inputs,making the device the ideal system-on-a-chip power solution for consumer communications equipment.

Channel 1 is a step-down regulator with an input voltage range 6.0 to 24V, providing up to 4.5A output current. 490kHz fixed switching frequency allows small L/C filtering components. Channel 1 utilizes voltage mode control configured for optimum performance across the entire output voltage and load range.

Channel 2 is a low-dropout (LDO) regulator providing up to 600mA output current. The device provides extremely low output noise, low quiescent current and excellent transient response.

The controller includes integrated cycle-by-cycle overcurrent protection, soft-start and over-temperature disable features. Independent input and enable pins provide maximum design flexibility.

The AAT2687 is available in the Pb-free, 4x5mm 24-pin TQFN package. The rated operating temperature range is -40C to 85C.

Features

• 2-Output Step-Down Converters:
• Channel 1 Step-Down: VIN1 = 6V to 24V
• VOUT1 Adjustable from 1.5V to 5.5V
• IOUT1 up to 4.5A
• High Switching Frequency
• Voltage Mode Control
• PWM Fixed Frequency for Low-Ripple
• Channel 2 (LDO): VIN2 = 2.7V to 5.5V
• IOUT2 up to 600mA
• 1V Dropout Voltage at 600mA
• High Accuracy ±1.5%
• Small Solution Size
• System On a Chip
• Ultra-small External L/C
• Shutdown Current <35μA
• Independent Enable Pins
• Programmable Over-Current Protection
• Over-Temperature Protection
• Internal Soft Start
• 4x5mm 24-Pin TQFN Low Profile Thermally Enhanced Package
• -40°C to 85°C Temperature Range

Typical applications

• DSL and Cable Modems
• Wireless LAN Systems
• • Satellite Settop Box
• Notebook Computers

More information

• Datasheet
• IC product information