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.
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
TDFN 34-16
IN
BST
LX
EN
EN
D2
B340A
D1
BAS16
C2
0.1µF
L1
4.7µH
R1
6.34K
C7
330pF
R4
44.2K
R3
499
C8
22µF
C9
22µF
V
OUT
5V/2.5A
AAT1189
C1
100µF
25V
+
C12
1µF
25V
RS
VL
C4
68nF
OS
FB
C3
2.2µF
R2
24.3K
COMP
C5
220pF
C6
56pF
R5
6.04K
GND
1189.2008.06.1.0
www.analogictech.com
1
PRODUCT DATASHEET
AAT1
189
SwitchReg
TM
Pin Descriptions
Pin #
1, 2, 3, 4, 5,
15, 16
6
7
8
9
10
11
12
13
14
EP
High Voltage Step-Down Regulator
Symbol
LX
BST
EN
RS
OS
COMP
FB
GND
VL
IN
IN
Function
Step-down converter switching pin. Connect output inductor to this pin. Connect LX pins together.
Boost drive input pin. Connect the cathode of fast rectifier from this pin and connect a 100nF ca-
pacitor from this pin to the switching node (LX) for internal hi-side MOSFET gate drive.
Enable input pin. Active high.
Output current sense pin. Connect a small signal resistor from this pin to switching node (LX) to en-
able over-current sense for step-down converter.
Output voltage sense pin. Connect to the output capacitor to enable over-current sense for step-
down converter.
Compensation pin for step-down regulator. Connect a series resistor, capacitor network to compen-
sate the voltage mode control loop.
Feedback input pin for step-down converter. Connect an external resistor divider to this pin to pro-
gram the output voltage to the desired value.
Ground pin for step-down converter. Connect input and output capacitors return terminals close to
this pin for best noise performance.
Internal linear regulator. Connect a 2.2μF/6.3V capacitor from this pin to GND pin.
Input supply voltage pin for step-down regulator. Connect both IN pins together. Connect the input
capacitor close to this pin for best noise performance.
Exposed paddle connected internally to IN. Connect to PCB heatsink to ensure maximum thermal
dissipation.
Pin Configuration
TDFN34-16
(Top View)
LX
LX
LX
LX
LX
BST
EN
RS
1
2
3
4
5
6
7
8
16
15
14
EP
13
12
11
10
9
LX
LX
IN
VL
GND
FB
COMP
OS
2
www.analogictech.com
1189.2008.06.1.0
PRODUCT DATASHEET
AAT1
189
SwitchReg
TM
Absolute Maximum Ratings
1
Symbol
V
IN(HI)
V
IN(LO)
V
BST1-LX
V
CONTROL
V
EN
I
IN(PULSED)
T
J
T
LEAD
High Voltage Step-Down Regulator
Description
IN, LX to GND
VL to GND
BST to LX
FB, COMP, OS, RS to GND
EN to GND
IN to LX
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 30.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to V
IN(LO)
+ 0.3
-0.3 to 6.0
12.0
-40 to 150
300
Units
V
V
V
V
V
A
°C
°C
Thermal Information
Symbol
Θ
JA
P
D
Description
Thermal Resistance
2
Maximum Power Dissipation
3
Value
50
2.0
Units
C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board with exposed paddle connected to single layer PCB plane.
3. Derate 20mW/°C above 25°C ambient temperature for TDFN34-16 package. Increased power dissipation is possible with additional PCB heatsinking.
1189.2008.06.1.0
www.analogictech.com
3
PRODUCT DATASHEET
AAT1
189
SwitchReg
TM
Electrical Characteristics
1
V
IN
= 12V; T
A
= -40°C to 85°C, unless noted otherwise. Typical values are at T
A
= 25°C.
Symbol
V
IN
V
UVLO
V
OUT
V
FB
ΔV
LINEREG
/
ΔV
IN
ΔV
LOADREG
/
ΔI
IN
I
Q
I
SHDN
V
OCP
I
LX
D
MAX
T
ON(MIN)
R
DSON(H)
F
OSC
F
FOLDBACK
T
SS
T
SD
V
EN(L)
V
EN(H)
I
EN
High Voltage Step-Down Regulator
Description
Input Voltage
UVLO Threshold
Output Voltage Range
Output Voltage Accuracy
Feedback Pin Voltage
Line Regulation
Load Regulation
Quiescent Current
Shutdown Current
Over-Current Offset Voltage
LX Pin Leakage Current
Maximum Duty Cycle
Minimum On-Time
Hi Side On-Resistance
Oscillator Frequency
Short Circuit Foldback Frequency
Soft-Start Time
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
V
IN
Rising
V
IN
Hysteresis
V
IN
Falling
I
OUT
= 0A to 2.5A
V
IN
= 6V to 24V, V
OUT
= 3.3V, I
OUT
= 2.5A
V
IN
= 6V to 24V, V
OUT
= 5.0V, I
OUT
= 2.5A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A to 2.5A
V
IN
= 12V, V
OUT
= 5V, I
OUT
= 0A to 2.5A
V
EN
= High, No load
V
EN
= Low, V
L
= 0V
V
EN
= High, V
IN
= 6.0V to 24.0V, T
A
= 25°C
V
IN
= 24.0V, V
EN
= Low
V
IN
= 6.0 to 24.0V
V
L
= 4.5V
Min
6.0
Typ
Max
24.0
5.0
Units
V
V
mV
V
V
%
V
%/V
%/A
300
3.0
1.5
-2.5
0.591
5.5
2.5
0.609
0.600
0.028
0.17
0.064
0.08
0.6
100
85
100
70
490
100
2.5
135
15
80
-1.0
35.0
120
1.0
350
Current Limit Triggered
From Enable to Output Regulation
650
0.6
2.5
-1.0
1.0
mA
μA
mV
μA
%
ns
mΩ
kHz
kHz
ms
°C
°C
V
V
μA
1. The AAT1189 is guaranteed to meet performance specifications over the –40°C to +85°C operating temperature range and is assured by design, characterization and correla-
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