4.5A PMIC
Description
DATA SHEET
AAT2688
4.
5A PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
General Description
The AAT2688 provides two independently regulated DC outputs: a high voltage synchronous step-down (Buck) regulator and a low input voltage step-down low dropout (LDO) regulator.
The PMIC is optimized for low cost 12V adapter inputs, making the device the ideal system-ona-chip power solution for consumer communications equipment.
Channel 1 is a step-down regulator with an input voltage range of 6.
0V 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 low output noise, low quiescent current, and excellent transient response.
The step-down regulator includes integrated over-current, soft-start and over-temperature protection.
Independent input and enable pins provide maximum design flexibility.
The AAT2688 is available in the Pb-free 4mm x 5mm 24-pin TQFN package.
The rated operating temperature range is -40°C to 85°C.
Features
• 2-Output Step-Down Converters: • Channel 1 (Buck): VIN1 = 6.
0 to 24.
0V
▪ VOUT1 Adjustable from 0.
8V to 5.
5V ▪ IOUT1 up to 4.
5A ▪ High Switching Frequency ▪ Voltage Mode Control ▪ High Accuracy ±1.
5% ▪ PWM Fixed Frequency for Low Ripple
• Channel 2 (LDO): VIN2 = 2.
7V to 5.
5V
▪ IOUT2 up to 600mA ▪ 1V Dropout Voltage at 600mA IOUT
• Small Solution Size • System on a Chip • Ultra-small External L/C • Shutdown Current <35μA • Independent Enable Pins • Over-Current and Over-Temperature Protection • Internal Soft Start • 4x5mm 24-Pin TQFN Low Profile Package • -40°C to 85°C Temperature Range
Applications
• DSL and Cable Modems • Notebook Computers • Satellite Set-top Boxes • Wireless LAN Systems
Typical Application
C3 0.
1μF
D1
...
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