AAT1112 Datasheet, PDF (2/19 Pages) Advanced Analogic Technologies – 1.5A, 1.4MHz Step-Down Converter

DATA SHEET
AAT1112
1.5A, 1.4MHz Step-Down Converter
Pin Descriptions
Pin #
TSOPJW-12 TDFN33-12
1
12
2
11
3
10
4
9
5
6
7
8, 9, 10, 11
12
N/A
8
7
6
4, 5
1, 2, 3
EP
Symbol
LX
VP
N/C
MODE/SYNC
EN
VIN
FB
GND
PGND
Function
Switching node. Connect the output inductor to this pin. The switching node is inter-
nally connected to the drain of both high- and low-side MOSFETs.
Input voltage for the power switches.
Not connected.
Connect to ground for PFM/PWM mode and optimized efficiency throughout the load
range. Connect high for low noise PWM operation under all operating conditions.
Connect to an external clock for synchronization (PWM only).
Enable pin. A logic low disables the converter and it consumes less than 1μA of cur-
rent. When connected high, it resumes normal operation.
Power supply. Supplies power for the internal circuitry.
Feedback input pin. This pin is connected either directly to the converter output or
to an external resistive divider for an adjustable output.
Non-power signal ground pin.
Main power ground return pin. Connect to the output and input capacitor return.
Exposed paddle (bottom); connect to ground as closely as possible to the device.
Pin Configuration
TSOPJW-12
(Top View)
TDFN33-12
(Top View)
LX 1
VP ²
N/C ³
MODE/SYNC ⁴
EN ⁵
VIN ⁶
12 PGND
11 _GND
10 _GND
9 _GND
8 _GND
7 _FB
PGND ¹
PGND ²
PGND ³
GND ⁴
GND ⁵
FB ⁶
12 _LX
11 _VP
10 _N/C
9 _MODE/SYNC
8 _EN
7 _VIN
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201972B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013