1.5A, 1.4MHz Step-Down Converter
Pin Descriptions
Pin #
TSOPJW-12
TDFN33-12
AAT1112
Symbol
LX
Function
Switching node. Connect the output inductor to this pin. The
switching node is internally 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 efficien-
cy 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 con-
sumes less than 1µA of current. 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.
1
12
2
3
4
11
10
9
VP
N/C
MODE/SYNC
5
8
EN
6
7
7
6
VIN
FB
8, 9, 10, 11
12
N/A
4, 5
1, 2, 3
EP
GND
PGND
Pin Configuration
TSOPJW-12
(Top View)
TDFN33-12
(Top View)
LX
VP
N/C
MODE/SYNC
EN
VIN
1
2
3
4
5
6
12
11
10
9
8
7
PGND
GND
GND
GND
GND
FB
PGND
PGND
PGND
GND
GND
FB
1
2
3
4
5
6
12
11
10
9
8
7
LX
VP
N/C
MODE/SYNC
EN
VIN
2
1112.2007.01.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
