AAT2522 Datasheet, PDF (2/19 Pages) Skyworks Solutions Inc. – Dual High-Current, Low-Noise, Step-Down Regulator

DATA SHEET
AAT2522
Dual High-Current, Low-Noise, Step-Down Regulator
Pin Descriptions
Pin #
1
2
3
4
5
6-7
8
9-10
11
12
13
14
15
16
EP
Name
VCC2
EN2
IN2
EN1
VCC1
IN1
LX1
PGND1
FB1
AGND1
LX2
PGND2
FB2
AGND2
AGND
Function
Bias supply input for regulator #2.
Enable input for regulator #2. A logic high enables the second regulator of the AAT2522. A logic
low forces regulator #2 into shutdown mode, placing the second output into a high-impedance
state and reducing the VCC2 quiescent current to less than 1μA.
Power supply input for regulator #2.
Enable input for regulator #1. A logic high enables the primary regulator of the AAT2522. A logic
low forces regulator #1 into shutdown mode, placing the primary output into a high-impedance
state and reducing the VCC1 quiescent current to less than 1μA.
Bias supply input for regulator #1.
Power supply input for regulator #1.
Inductor switching node for regulator #1. LX1 is the drain of the internal high-side P-channel and
low-side N-channel MOSFETs. Externally connected to the power inductor as shown in the "Typical
Application" drawing on page 1 of this datasheet.
Power ground for regulator #1. PGND1 is internally connected to the source of the internal low-side
N-channel MOSFET.
Feedback input for regulator #1. FB1 senses the output voltage for regulation control. Connect a
resistive divider network from the output to FB1 to AGND1 to set the output voltage accordingly.
The FB1 regulation threshold is 0.8V.
Analog ground for regulator #1. AGND1 is internally connected to the analog ground of the control
circuitry.
Inductor switching node for regulator #2. LX2 is the drain of the internal high-side P-channel and
low-side N-channel MOSFETs. Externally connected to the power inductor as shown in the "Typical
Application" drawing on page 1 of this datasheet.
Power ground for regulator #2. PGND2 is internally connected to the source of the internal low-side
N-channel MOSFET.
Feedback input for regulator #2. FB2 senses the output voltage for regulation control. Connect a
resistive divider network from the output to FB2 to AGND2 to set the output voltage accordingly.
The FB2 regulation threshold is 0.6V.
Analog ground for regulator #2. AGND2 is internally connected to the analog ground of the control
circuitry.
Substrate analog ground.
Pin Configuration
TDFN34-16
(Top View)
VCC2 ¹
EN2 ²
IN2 ³
EN1 ⁴
VCC1 ⁵
IN1 ⁶
IN1 ⁷
LX1 ⁸
AGND
16 _AGND2
15 _FB2
14 _PGND2
13 _LX2
12 _AGND1
11 FB1
10 _PGND1
9 _PGND1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
2
202032A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012