PRODUCT DATASHEET
AAT1145
SwitchRegTM
1.2A Step-Down Converter
Pin Descriptions
Pin #
Symbol
Function
Enable pin. Active high. In shutdown, all functions are disabled drawing <1μA supply current. Do not
leave EN floating.
1
EN
2
3
4, 6
IN
AIN
AGND
Power supply input pin. Must be closely decoupled to AGND with a 2.2μF or greater ceramic capacitor.
Analog supply input pin. Provides bias for internal circuitry.
Analog ground pin
FB pin (AAT1145IDE-0.6): Adjustable version feedback input. Connect FB to the center point of the
external resistor divider. The feedback threshold voltage is 0.6V.
5
FB/OUT
OUT pin (AAT1145IDE-1.8): Fixed version feedback input. Connect OUT to the output voltage, VOUT.
7, 8
9, 10
LX
PGND
EP
Switching node pin. Connect the output inductor to this pin.
Power ground pin
Power ground exposed pad. Must be connected to bare copper ground plane.
Pin Configuration
TDFN-10
(Top View)
1
10
9
EN
IN
PGND
PGND
LX
2
3
4
5
8
AIN
7
AGND
FB/OUT1
LX
6
AGND
1. FB pin for the adjustable voltage version (AAT1145IDE-0.6), OUT pin for the fixed voltage version (AAT1145IDE-1.8).
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1145.2007.11.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
