AAT1189 Datasheet, PDF (1/19 Pages) Advanced Analogic Technologies – High Voltage Step-Down Regulator

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General Description
The AAT1189 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 2.5A 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 AAT1189 is available in the Pb-free, low profile
16-pin TDFN34 package. The rated operating tempera-
ture range is -40°C to 85°C.
PRODUCT DATASHEET
AAT1189
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 2.5A}
• 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 3x4mm TDFN-16 Packages
• -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
6.0V - 24.0V
C1 ₊
100µF
25V
EN
C12
1µF
25V
C3
2.2µF
TDFN 34-16
IN
BST
LX
EN
AAT1189
RS
VL
OS
FB
COMP
GND
D1
BAS16
C2
0.1µF
D2
B340A
L1
4.7µH
R1
6.34K
C7
330pF
C4
R3
68nF
499
V_OUT
5V/2.5A
R4
44.2K
C8
C9
22µF 22µF
R2
C5
24.3K 220pF
C6
56pF
R5
6.04K
1189.2008.06.1.0
www.analogictech.com
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