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Advanced Analogic Technologies

AAT2786 Datasheet Preview

AAT2786 Datasheet

1.5A Step-Down Converter and 150mA LDO

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SystemPowerTM
PRODUCT DATASHEET
AAT2786
1.5A Step-Down Converter and 150mA LDO
General Description
The AAT2786 is a dual output power solution. It includes
a 1.5A, 1.4MHz, high-efficiency step-down converter and
a high performance 150mA LDO regulator. The step-
down regulator output voltage is adjustable from 0.6V to
VIN. The LDO regulator has a factory preset fixed output
voltage from 1.2V to 3.3V.
The step-down converter consumes only 42µA of no-load
quiescent current and is designed to maintain high effi-
ciency throughout the load range. The step-down con-
verter has ultra-low RDS(ON) integrated MOSFETs and can
operate up to 100% duty cycle to enable high output
voltage, high current applications which require a low
dropout threshold. The AAT2786 provides excellent tran-
sient response and high output accuracy across the
operating range. Pulling the MODE/SYNC pin high
enables “PWM Only” mode, maintaining constant fre-
quency and low output ripple across the operating range.
Alternatively, the converter may be synchronized to an
external clock input via the MODE/SYNC pin.
The MicroPower low dropout linear regulator in the
AAT2786 has been specifically designed for high-speed
turn-on and turn-off performance, fast transient response,
and good noise and power supply ripple rejection (PSRR),
making it ideal for powering sensitive circuits with fast
switching requirements.
Over-temperature and short-circuit protection safeguard
the AAT2786 and system components from damage.
Features
VIN Range : 2.5V to 5.5V
1.5A Step-Down Converter
VOUT Range: 0.6V to VIN
95% Peak Efficiency
High Efficiency across load range
42µA No Load Quiescent Current
Optional “PWM Only” Low Noise Mode
Current limit and soft start
150mA LDO Regulator
VOUT Range: 1.2V to 3.3V (Fixed)
High Power Supply Rejection Ratio
Low Output Noise
Independent Enable Pins
Integrated Power MOSFETs
Over-Temperature Protection
TDFN34-16 Package
• -40°C to +85°C Temperature Range
Applications
Cellular and Smart Phones
PDAs, Palmtops
Digital Still and Video Cameras
Portable Instruments
Battery-Powered Applications
Typical Application
BUCK IN
C1
opt
R1
100
C2
10µF
C3
1µF
U1 L1
16 VP
15 VP
LX 1
3.3µH
LX 2
R2
Adj
12 VIN
FB 5
ON/OFF
ON/OFF
AAT2786IRN
13 BUCK_EN
GND
14 MODE/SYNC
4
R3
59k
LDO IN
11 LDOIN LDO_OUT 6
ON/OFF
C6
1µF
9 LDO_EN
8 BYP
PGND 3
C8
10nF 10 N/C
LDO_GND 7
BUCK OUT
C5
Opt C4
22µF
LDO OUT
C7
2.2µF
2786.2008.04.1.0
www.analogictech.com
1




Advanced Analogic Technologies

AAT2786 Datasheet Preview

AAT2786 Datasheet

1.5A Step-Down Converter and 150mA LDO

No Preview Available !

SystemPowerTM
PRODUCT DATASHEET
AAT2786
1.5A Step-Down Converter and 150mA LDO
Pin Descriptions
Pin #
1, 2
3
4
5
6
7
8
9
10
11
12
13
14
15,16
Symbol
LX
PGND
GND
FB
LDOOUT
LDO_GND
BYP
LDO_EN
N/C
LDOIN
VIN
BUCK_EN
MODE/SYNC
VP
Description
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.
Step-down converter main power ground return pin. Connect to the output and input capacitor return.
Non-power signal ground pin.
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.
LDO output pin; should be decoupled with 2.2µF ceramic capacitor.
LDO ground connection pin.
LDO bypass capacitor connection; to improve AC ripple rejection, connect a 10nF capacitor to GND. This
will also provide a soft start function.
LDO enable pin; this pin should not be left oating. When pulled low, the LDO PMOS pass transistor
turns off and all internal circuitry enters low-power mode, consuming less than 1µA.
Open
LDO input voltage pin; should be decoupled with 1µF or greater capacitor.
Step-down converter power supply. Supplies power for the internal circuitry.
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.
Connect to ground for Light-Load/PWM mode and optimized efciency 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).
Step-down converter input voltage for the power switches.
Pin Configuration
TDFN34-16
(Top View)
LX
LX
PGND
GND
FB
LDOOUT
LDO_GND
BYP
1
2
3
4
5
6
7
8
16 VP
15 VP
14 MODE/SYNC
13 BUCK_EN
12 VIN
11 LDOIN
10 N/C
9 LDO_EN
2
www.analogictech.com
2786.2008.04.1.0


Part Number AAT2786
Description 1.5A Step-Down Converter and 150mA LDO
Maker Advanced Analogic Technologies
Total Page 27 Pages
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