PMIC Solution for 24V Systems with 2 High Performance Step-Down Converters

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Manufacturer Skyworks


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.

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    • 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

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Features Similar products
Control scheme Voltage Mode Control  

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Switching frequency (kHz) 490  
Max Input Voltage (V) 6 to 24  
Output Voltage (V) 1.5 to 5.5  
Typ. Active Current (µA) 600  
Typ. Dropout Voltage @ Max. lout (mV) 1000  
Typ. Output Voltage Accuracy (%) ± 2.5 (Channel 1), ± 3.5 (Channel 2)  
Output Capacitor Type 22μF, Ceramic Capacitors (Channel 1), 1μF, to 10μF, Ceramic Capacitors (Channel 2)  
Output Current (mA) 4500 (Channel 1), 600 (Channel 2)  
Operating Temperature (°C) -40 to +85  
Package TQFN45-24