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Sky Works AAT2689

PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters

Overview

TopologyBuck Converter
Input voltage6-24 V
Switching frequency350-650 kHz
Output 15 V / 2.5 A

Description

The AAT2689 provides two independently regulated DC outputs, consisting of a high voltage step-down (Buck) regulator and a low input voltage low dropout (LDO) regulator. The PMIC is optimized for low cost 12V adapterinputs, making the device the ideal system-on-a-chip power solution for consumer communications equipment.

Channel 1 is a step-down (Buck) regulator with an input voltage range of 6V to 24V providing up to 2500mA 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 AAT2689 is available in the Pb-free 3x4mm 16-pin TDFN package. The rated operating temperature range is -40°C to 85°C.

Features

  • 2-Output Step-Down Converters:
  • Channel 1 (Buck): VIN1 = 6V to 24V
  • VOUT1 adjustable from 1.5V to 5.5V
  • IOUT1 up to 2.5A
  • 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
  • Adjustable Over-Current Protection
  • Over-Temperature Protection
  • Internal Soft Start
  • 3x4mm 16-Pin TDFN Low Profile Thermally Enhanced Package
  • -40°C to 85°C Temperature Range

Typical applications

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

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
7447789004
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 4.7 2.9 3.9 33 35 45 7332 Robust
Order Code Data­sheet
7447789004
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples