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AAT2783 Datasheet Preview

AAT2783 Datasheet

Triple-Output PMIC

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DATA SHEET
AAT2783
Triple-Output PMIC: Dual Buck with Low-VIN 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 65μVRMS 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.
VIN Range Step-Down (Buck): 2.7V to 5.5V
VIN Range Low Drop-Out (LDO): 1.5V to 5.5V
Output Voltage Range: 0.6V to VIN
• Step-Down Output Current:
Channel 1: 1000mA
Channel 2: 400mA
• LDO Output Current:
Channel 3: 400mA
High Efficiency with Low RDS(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 LX2
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 • sales@skyworksinc.com • www.skyworksinc.com
202039A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
1




Skyworks

AAT2783 Datasheet Preview

AAT2783 Datasheet

Triple-Output PMIC

No Preview Available !

DATA SHEET
AAT2783
Triple-Output PMIC: Dual Buck with Low-VIN LDO
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
FB2
EN3
VIN
AGND
BYP
EN2
EN1
FB1
LX1
GND1
VP1
VP2
GND2
LX2
VIN3
OUT3
EP
Function
Feedback input pin for Channel 2. Connect an external resistor divider to this pin to program the output
voltage to the desired value.
Enable Channel 3 input. Pull logic high to enable LDO Channel 3 converter. Pull logic low to disable. Chan-
nel 3 will turn on when EN3 is high and Channel 2 is in regulation.
Input voltage pin. Connect this pin to input voltage source.
Analog ground pin. Connect to ground plane.
LDO bypass pin. Connect a 10nF ceramic capacitor from this pin to ground plane for low output noise.
Enable Channel 2 input. Pull logic high to enable step-down Channel 2 converter. Pull logic low to disable.
Enable Channel 1 input. Pull logic high to enable step-down Channel 1 converter. Pull logic low to disable.
Channel 1 feedback pin internally set to 0.6V. Connect resistor divider and optional feed-forward capaci-
tor to this pin to set the Channel 1 voltage and adjust transient load response (see Table 1).
Channel 1 converter switching pin. Connect Channel 1 inductor to this pin. Inductor value is determined
by output voltage (see Table 2).
Power return pin for output 1 step-down converter. Connect returns of Channel 1 input and output ca-
pacitors close to this pin for best noise performance.
Input supply voltage pin for Channel 1 step-down converter. Connect the input capacitor close to this pin
for best noise performance.
Input supply voltage pin for Channel 2 step-down converter. Connect the input capacitor close to this pin
for best noise performance.
Power return pin for Channel 2 step-down converter. Connect returns of Channel 2 input and output ca-
pacitors close to this pin for best noise performance.
Channel 2 converter switching pin. Connect output 2 inductor to this pin. Inductor value is determined by
output voltage (see Table 2).
Input supply voltage pin for output 3 low-noise LDO converter. Connect the input capacitor close to this
pin for best noise performance.
Channel 3 LDO step-down converter output pin. Connect this pin to a 10μF ceramic capacitor.
Exposed pad. Connect to ground as close as possible to the device. Use properly sized vias for thermal
coupling to the ground plane. See section on PCB layout guidelines.
Pin Configuration
TDFN34-16
(Top View)
FB2 1
EN3 2
VIN 3
AGND 4
BYP 5
EN2 6
EN1 7
FB1 8
16 OUT3
15 VIN3
14 LX2
13 GND2
12 VP2
11 VP1
10 GND1
9 LX1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202039A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012


Part Number AAT2783
Description Triple-Output PMIC
Maker Skyworks
Total Page 22 Pages
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