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AAT2786 Datasheet(PDF) 2 Page - Advanced Analogic Technologies

No. de pieza AAT2786
Descripción Electrónicos  1.5A Step-Down Converter and 150mA LDO
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Fabricante Electrónico  ANALOGICTECH [Advanced Analogic Technologies]
Página de inicio  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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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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