Step-Down Regulator. AAT1184 Datasheet

AAT1184 Regulator. Datasheet pdf. Equivalent

AAT1184 Datasheet
Recommendation AAT1184 Datasheet
Part AAT1184
Description High Voltage Step-Down Regulator
Feature AAT1184; General Description The AAT1184 is a single output step-down (Buck) DC output regulator with an inte.
Manufacture Skyworks
Datasheet
Download AAT1184 Datasheet




Skyworks AAT1184
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 -40C to 85C.
DATA SHEET
AAT1184
High Voltage Step-Down Regulator
Features
VIN = 6.0 to 24.0V
VOUT Adjustable from 1.5V to 5.5V
IOUT 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
VIN
6V - 24V
TSOPJW -12
IN BST
+
C1
25µF
25V
D1
BAS16
C12
1µF
25V
LX
EN
RS
AAT1184
VL
C3
2.2µF
OS
FB
COMP
GND
C2
0.1µF
L1
4.7µH
D2
B340A
R1
2.32K
C4
68nF
C7
330pF
R7
499
R2
24.3K
C5
220pF
C6
56pF
VOUT
5V/1.2A
R4
44.2k
C8
22µF
R5
6.04k
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202000A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 29, 2012
1



Skyworks AAT1184
DATA SHEET
AAT1184
High Voltage Step-Down Regulator
Pin Descriptions
Pin #
1
2
3
4, 5
6, 7
8
9
10
11
12
Symbol
RS
EN
BST
LX
IN
VL
GND
FB
COMP
OS
Function
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.
Enable input pin. Active high.
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.
Step-down converter switching pin. Connect output inductor to this pin. Connect LX pins together.
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.
Internal linear regulator. Connect a 2.2μF/6.3V capacitor from this pin to GND pin.
Ground pin for step-down converter. Connect input and output capacitors return terminals close to
this pin for best noise performance.
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.
Compensation pin for step-down regulator. Connect a series resistor, capacitor network to compen-
sate the voltage mode control loop.
Output voltage sense pin. Connect to the output capacitor to enable over-current sense for step-
down converter.
Pin Configuration
TSOPJW-12
(Top View)
RS
EN
BST
LX
LX
IN
1
2
3
4
5
6
12 OS
11 COMP
10 FB
9 GND
8 VL
7 IN
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202000A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 29, 2012



Skyworks AAT1184
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
JA
PD
Description
Thermal Resistance
Maximum Power Dissipation2
DATA SHEET
AAT1184
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
140
0.7
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. Derate 7mW/°C above 25°C ambient temperature.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202000A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 29, 2012
3







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