AAT1142 Datasheet, PDF (2/22 Pages) Advanced Analogic Technologies – 800mA Voltage-Scaling Step-Down Converter

AAT1142
800mA Voltage-Scaling Step-Down Converter
Pin Descriptions
Pin #
TSOPJW-12 TDFN33-12
1
12
Symbol
LX
2
11
PGND
3
10
MODE/SYNC
4
9
5
8
6
7
7
6
8, 9, 10, 11
4, 5
12¹
3
12¹
1
n/a
2
n/a
EP
SDA
SCL
EN/SET
FB
AGND
VIN
PVIN
N/C
Function
Connect the output inductor to this pin. The switching node is
internally connected to the drain of both high- and low-side
MOSFETs.
Main power ground return pin. Connect to the output and
input capacitor return.
Connect to ground for PFM/PWM mode and optimized effi-
ciency throughout the load range. Connect to high for low
noise PWM Only operation under all operating conditions.
Connect to an external clock for synchronization (PWM Only).
I²C control pin: Data input.
I²C control pin: Clock input.
IC enable pin. Pull high to enable the AAT1142; pull low to
disable the AAT1142. Also serves as S²Cwire input for pro-
grammable output voltages.
Feedback input pin. This pin is connected directly to the con-
verter output for programmable output.
Ground connection pin.
Input voltage for the converter.
Input voltage for the power switches.
Not connected.
Exposed paddle (bottom); connect to ground as closely as
possible to the device.
Pin Configuration
TSOPJW-12
(Top View)
LX ¹
PGND ²
MODE/SYNC ³
SDA ⁴
SCL ⁵
EN/SET ⁶
12 _VIN
11 _AGND
10 _AGND
9 _AGND
8 _AGND
7 _FB
TDFN33-12
(Top View)
PVIN ¹
N/C ²
VIN ³
AGND ⁴
AGND ⁵
FB ⁶
12 _LX
11 _PGND
10 _MODE/SYNC
9 _SDA
8 _SCL
7 _EN/SET
1. VIN and PVIN are tied together in the TSOPJW-12 package.
2
1142.2006.07.1.0