PRODUCT DATASHEET
AAT1
184
SwitchReg
TM
General Description
The AAT1184 is a single output step-down (Buck) DC
output regulator with an integrated high side MOSFET.
The input range is 6V to 24V making it the ideal power IC
solution for consumer communications equipment oper-
ating from a low cost AC/DC adapter with 12V output.
The step-down regulator provides up to 1.2A output cur-
rent in a small package. 490kHz fixed switching fre-
quency allows small L/C filtering components.
Voltage mode control allows for optimum performance
across the entire output voltage and load range.
The controller includes programmable over-current, inte-
grated soft-start and over-temperature protection.
The AAT1184 is available in the Pb-free, low profile
12-pin TSOPJW package. The rated operating tempera-
ture range is -40°C to 85°C.
High Voltage Step-Down Regulator
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
V
IN
= 6.0 to 24.0V
V
OUT
Adjustable from 1.5V to 5.5V
I
OUT
up to 1.2A
Small Solution Size
Low-Cost Non-Synchronous Solution
Shutdown Current <35μA
High Switching Frequency
Voltage Mode Control
PWM Fixed Frequency for Lowest Noise
▪
Programmable Over-Current Protection
Over-Temperature Protection
Internal Soft Start
Low Profile 3x3mm TSOPJW-12 Package
-40°C to 85°C Temperature Range
Applications
•
•
•
•
DSL and Cable Modems
Notebook Computers
Satellite Set Top Box
Wireless LAN Systems
Typical Application
V
IN
6V - 24V
TSOPJW -12
IN
BST
C2
0.1µF
LX
D1
BAS16
+
C1
25µF
25V
C12
1µF
25V
EN
RS
D2
B340A
R1
2.32K
C4
68nF
C7
330pF
R4
44.2k
R7
499
C8
22µF
L1
4.7µH
V
OUT
5V/1.2A
AAT1184
VL
OS
FB
C3
2.2µF
R2
24.3K
COMP
GND
C5
220pF
C6
56pF
R5
6.04k
1184.2008.07.1.0
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