AAT2783_12 Datasheet, PDF (1/22 Pages) Skyworks Solutions Inc. – Triple-Output PMIC Dual Buck with Low-VIN LDO

DATA SHEET
AAT2783
Triple-Output PMIC: Dual Buck with Low-V_IN LDO
General Description
Features
The AAT2783 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 1000mA and 400mA 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 65μV_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 AAT2783 is available in the Pb-free, 16-pin TDFN34
package and is rated over the -40°C to 85°C operating
temperature range.
• 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:
▪ Channel 1: 1000mA
▪ Channel 2: 400mA
• LDO Output Current:
▪ Channel 3: 400mA
• High Efficiency with Low R_{DS(ON) Switches}
▪ Step-Down up to 97%
▪ ^{LDO Regulator up to 80%}
• Total Quiescient Current 135μA
• Shutdown Current: 1μA
• Step-Down Converters
▪ 1.3MHz Switching Frequency
▪ Current Mode Control
▪ Cycle-by-Cycle Current Limit
▪ High Efficiency Light-Load Mode Operation
• LDO Converter
▪ Ultra Low Noise with Bypass Capacitor
▪ Over-Current Protection
• 200μs Internal Soft Start
• Over-Temperature Protection
• TDFN34-16 Low Profile Package
• -40°C to 85°C Temperature Range
Applications
Typical Application
• Cellular and SmartPhones
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
• Portable Media Players
• Wireless Data Systems
VIN
2.7V –5.5V
C1
10μF
AAT2783
C4
0.1μF
VP1
EN1
VIN
AGND
LX1
FB1
GND1
VP2
LX 2
EN2
FB2
VIN = VOUT2
C3
2.2μF
GND2
VIN3
EN3
GND2
OUT3
BYP
AGND
EP
L1
1.5μH
VOUT1
1.2V, 1.0A
L2
2.2μH
R5
59.0k
R4
59.0k
C8
10μF
VOUT2
1.7V, 0.4A
R3
107k
R2
59.0k
VOUT3
1.2V, 400mA
C5
4.7μF
C7
0.01μF
C2
10μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202039A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
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