Step-Down Regulator. AAT1189 Datasheet

AAT1189 Regulator. Datasheet pdf. Equivalent

AAT1189 Datasheet
Recommendation AAT1189 Datasheet
Part AAT1189
Description High Voltage Step-Down Regulator
Feature AAT1189; SwitchRegTM General Description The AAT1189 is a single output step-down (Buck) DC output regulator .
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Datasheet
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AAT AAT1189
SwitchRegTM
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
VIN = 6.0 to 24.0V
VOUT Adjustable from 1.5V to 5.5V
IOUT 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
VIN
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
68nF
R3
499
VOUT
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
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AAT AAT1189
SwitchRegTM
PRODUCT DATASHEET
AAT1189
High Voltage Step-Down Regulator
Pin Descriptions
Pin #
1, 2, 3, 4, 5,
15, 16
6
7
8
9
10
11
12
13
14
EP
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 rectier 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 LX
15 LX
14 IN
EP
13 VL
12 GND
11 FB
10 COMP
9 OS
2
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1189.2008.06.1.0



AAT AAT1189
SwitchRegTM
Absolute Maximum Ratings1
Symbol
VIN(HI)
VIN(LO)
VBST1-LX
VCONTROL
VEN
IIN(PULSED)
TJ
TLEAD
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)
Thermal Information
Symbol
ΘJA
PD
Description
Thermal Resistance2
Maximum Power Dissipation3
PRODUCT DATASHEET
AAT1189
High Voltage Step-Down Regulator
Value
-0.3 to 30.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to VIN(LO) + 0.3
-0.3 to 6.0
12.0
-40 to 150
300
Units
V
V
V
V
V
A
°C
°C
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
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