AAT2114A Datasheet, PDF (2/16 Pages) Skyworks Solutions Inc. – 2.5A Low-Noise, Fast Transient 3MHz Step-Down Regulator

DATA SHEET
AAT2114A
2.5A Low-Noise, Fast Transient 3MHz Step-Down Regulator
Pin Descriptions
Pin #
1, 2, 3
4
5
6, 8, 16
7
9
10, 11, 12
13, 14, 15
EP
Name
PGND
FB
SGND
N/C
EN
VCC
VP
LX
GND
Function
Power Ground. PGND is internally connected to the source of the low-side N-channel MOSFET. Connect to
the input capacitor and output capacitor return.
Feedback Input. FB senses the output voltage for regulation control. Connect a resistive divider net-
work from the output to FB to SGND to set the output voltage accordingly. The adjustable FB regulation
threshold is 0.6V.
Signal/Analog Ground. SGND is internally connected to the analog ground of the control circuitry. Con-
nect the return of the feedback components to this ground.
Not Internally Connected. This pin is not internally connected and may be either left open or shorted to
an adjacent pin.
Enable Input. A logic high enables the AAT2114A regulator. A logic low forces the AAT2114A into shut-
down mode, placing the output into a high-impedance state and reducing the quiescent current to less
than 1μA. Do NOT leave EN floating.
Bias Input Supply. VCC supplies power to the analog and logic signal control circuitry of the AAT2114A.
Input Power Supply. Connect VP to the input power source. Bypass VP to PGND with a 10μF or greater
ceramic capacitor. VP internally connects to the source of the high-side P-channel MOSFET and MOSFET
drivers as shown in the Functional Block Diagram.
Inductor Switching Node. LX is internally connected to the source of the high-side P-Channel MOSFET
and the drain of the low-side N-channel MOSFET. Externally connected to the power inductor as shown in
the Typical Application Circuit.
Thermal/Substrate Ground. GND is internally connected to the substrate of the controller and serves as
the lowest thermal impedance path. Connect directly to the system ground plane to keep the thermal
impedance low.
Pin Configuration
QFN33-16
(Top View)
PGND ¹
PGND ²
PGND ³
FB ⁴
12 _VP
11 VP
EP
10 _VP
9 _VCC
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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202004C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013