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AAT2782 Datasheet

  • AAT2782

  • Triple Output PMIC: Dual Buck with Low-VIN LDO

  • 3102.59KB

  • 22頁(yè)

  • ANALOGICTECH

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PRODUCT DATASHEET
AAT2782
SystemPower
TM
General Description
Triple Output PMIC: Dual Buck with Low-V
IN
LDO
Features
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V
IN
Range Step-Down (Buck): 2.7V to 5.5V
V
IN
Range Low Drop-Out (LDO): 1.5V to 5.5V
Output Voltage Range: 0.6V to V
IN
Step-Down Output Current:
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Channel 1: 1200mA
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Channel 2: 600mA
LDO Output Current:
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Channel 3: 400mA
High Efficiency with Low R
DS(ON)
Switches
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Step-Down up to 97%
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LDO Regulator up to 80%
Total Quiescient Current 170碌A(chǔ)
Shutdown Current: 1碌A(chǔ)
Step-Down Converters
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1.3MHz Switching Frequency
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Current Mode Control
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Cycle-by-Cycle Current Limit
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High Efficiency Light-Load Mode Operation
LDO Converter
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Ultra Low Noise with Bypass Capacitor
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Over-Current Protection
200碌s Internal Soft Start
Over-Temperature Protection
TDFN34-16 Low Profile Package
-40擄C to 85擄C Temperature Range
The AAT2782 provides three independently regulated
DC outputs: two step-down (Buck) regulators and a
single low input voltage, low drop-out (LDO) regulator.
The input voltage range for the step-down regulators is
2.7V to 5.5V, while the LDO regulator allows inputs from
1.5V to 5.5V. The low input voltage LDO regulator allows
high efficiency, step-down, low noise outputs. In addi-
tion, the LDO input may be connected to step-down
outputs 1 or 2.
The Channel 1 and 2 step-down regulators can deliver up
to 1200mA and 600mA output current, respectively.
Step-down output voltages are set with external resis-
tors. Switching frequency is set at 1.3MHz to ensure
small external filtering components. Current mode con-
trol assures fast transient response and stable operation
across the operating range. The Channel 3 LDO regulator
can deliver up to 400mA with -80dB power supply rejec-
tion ratio (PSRR) and 65碌V
RMS
output noise with an
optional bypass capacitor. The LDO output voltage is fac-
tory set with a default voltage of 1.20V. Independent
enable and input pins are provided. The device consumes
low quiescent current and provides high efficiency across
the load range for maximum life in battery systems.
The AAT2782 is available in the Pb-free, 16-pin TDFN34
package and is rated over the -40擄C to 85擄C operating
temperature range.
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Applications
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Cellular and SmartPhones
Microprocessor / DSP Core / IO Power
PDAs and Handheld Computers
Portable Media Players
Wireless Data Systems
Typical Application
V
IN
2.7V 鈥?.5V
VP1
EN1
VIN
C1
10碌F
C4
0.1碌F
AGND
GND1
L2
2.2碌H
VP2
EN2
FB2
R2
59.0k
GND2
V
IN
= V
OUT2
VIN3
EN3
C3
2.2碌F
AGND
EP
OUT3
BYP
C7
0.01碌F
C2
10碌F
GND2
V
OUT3
1.2V, 400mA
LX2
R3
107k
V
OUT2
1.7V, 0.6A
FB1
R4
59.0k
AAT2782
LX1
R5
59.0k
C8
10碌F
L1
1.5碌H
V
OUT1
1.2V, 1.2A
C5
4.7碌F
2782.2008.05.1.0
www.analogictech.com
1

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