AAT2783_12 Datasheet, PDF (2/22 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
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 • [e-mail] • www.skyworksinc.com
2
202039A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012