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AAT2786 Datasheet(PDF) 2 Page - Advanced Analogic Technologies |
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AAT2786 Datasheet(HTML) 2 Page - Advanced Analogic Technologies |
2 / 27 page AAT2786 1.5A Step-Down Converter and 150mA LDO SystemPower TM PRODUCT DATASHEET 2 2786.2008.04.1.0 www .analogictech.com AAT2786 1.5A Step-Down Converter and 150mA LDO SystemPower TM PRODUCT DATASHEET 2 2786.2008.04.1.0 www .analogictech.com Pin Descriptions Pin # Symbol Description 1, 2 LX Step-down converter switching node. Connect the output inductor to this pin. The switching node is internally connected to the drain of both high- and low-side MOSFETs. 3 PGND Step-down converter main power ground return pin. Connect to the output and input capacitor return. 4 GND Non-power signal ground pin. 5FB Step-down converter feedback input pin. This pin is connected either directly to the converter output or to an external resistive divider for an adjustable output. 6 LDOOUT LDO output pin; should be decoupled with 2.2µF ceramic capacitor. 7 LDO_GND LDO ground connection pin. 8 BYP LDO bypass capacitor connection; to improve AC ripple rejection, connect a 10nF capacitor to GND. This will also provide a soft start function. 9 LDO_EN LDO enable pin; this pin should not be left floating. When pulled low, the LDO PMOS pass transistor turns off and all internal circuitry enters low-power mode, consuming less than 1µA. 10 N/C Open 11 LDOIN LDO input voltage pin; should be decoupled with 1µF or greater capacitor. 12 VIN Step-down converter power supply. Supplies power for the internal circuitry. 13 BUCK_EN Step-down converter enable pin. A logic low disables the step-down converter and it consumes less than 1µA of current. When connected high, it resumes normal operation. 14 MODE/SYNC Connect to ground for Light-Load/PWM mode and optimized efficiency throughout the load range. Con- nect high for low noise PWM operation under all operating conditions. Connect to an external clock for synchronization (PWM only). 15,16 VP Step-down converter input voltage for the power switches. Pin Configuration TDFN34-16 (Top View) PGND GND FB LX LX 3 LDOOUT LDO_GND BYP MODE/SYNC BUCK_EN VIN VP VP LDOIN N/C LDO_EN 4 5 1 2 6 7 8 14 13 12 16 15 11 10 9 |
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