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PDF AAT1189 Data sheet ( Hoja de datos )
| Número de pieza | AAT1189 | |
| Descripción | High Voltage Step-Down Regulator | |
| Fabricantes | Skyworks | |
| Logotipo |  |
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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 -40C to 85C.
DATA SHEET
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
C11
1µF
50V
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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202002A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 31, 2012
1
1 page  
Typical Characteristics
Step-Down Converter Efficiency vs. Load
(VOUT = 3.3V; L = 4.7µH)
100
90
80
70
60
50
40
30
20
10
0
0.1
1
VIN = 6V
VIN = 8V
VIN = 12V
VIN = 18V
VIN = 24V
10
100
1000
10000
Output Current (mA)
Step-Down Converter DC Regulation
(VOUT = 3.3V; L = 4.7µH)
2.0
1.5
VIN = 6V
VIN = 8V
1.0 VIN = 12V
VIN = 18V
0.5 VIN = 24V
0.0
-0.5
-1.0
-1.5
-2.0
0.1
1 10 100 1000
Output Current (mA)
10000
Step-Down Converter Line Regulation
(VOUT = 3.3V; L = 4.7µH)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
6
IOUT = 0.10mA
IOUT = 10mA
IOUT = 100mA
IOUT = 1250mA
IOUT = 2500mA
8 10 12 14 16 18 20 22 24
Input Voltage (V)
DATA SHEET
AAT1189
High Voltage Step-Down Regulator
Step-Down Converter Efficiency vs. Load
(VOUT = 5V; L = 4.7µH)
100
90
80
70
60
50
40
30
20
10
0
0.1
1
VIN = 6V
VIN = 8V
VIN = 12V
VIN = 18V
VIN = 24V
10
100
1000
10000
Output Current (mA)
Step-Down Converter DC Regulation
(VOUT = 5V; L = 4.7µH)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
0.1
1
VIN = 6V
VIN = 8V
VIN = 12V
VIN = 18V
VIN = 24V
10
100
1000
10000
Output Current (mA)
Step-Down Converter Line Regulation
(VOUT = 5V; L = 4.7µH)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
6
IOUT = 0.10mA
IOUT = 10mA
IOUT = 100mA
IOUT = 1250mA
IOUT = 2500mA
8 10 12 14 16 18 20 22 24
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202002A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 31, 2012
5
5 Page 
Applications Information
The high voltage DC/DC step-down converter provides
an output voltage from 1.5V to 5.5V. The integrated
high-side n-channel MOSFET device provides up to 2.5A
output current1. Input voltage range is 6.0V to 24.0V.
The step-down converter utilizes constant frequency
(PWM-mode) voltage mode control to achieve high oper-
ating efficiency while maintaining extremely low output
noise across the operating range. High 490kHz (nominal)
switching frequency allows small external filtering com-
ponents, achieving minimum cost and solution size.
External compensation allows the designer to optimize
the transient response while achieving stability across
the operating range.
Output Voltage and Current
The output voltage is set using an external resistor
divider as shown in Table 1. Minimum output voltage is
1.5V and maximum output voltage is 5.5V. Typical max-
imum duty cycle is 85%.
VOUT(V)
1.5
1.8
1.85
2.0
2.5
3.0
3.3
5.0
R5 = 6.04k
R4(k)
9.09
12.1
12.4
14.0
19.1
24.3
27.4
44.2
Table 1: Feedback Resistor Values.
Alternatively, the feedback resistor may be calculated
using the following equation:
R4 =
(VOUT - 0.6) · R5
0.6
R4 is rounded to the nearest 1% resistor value.
Buck Regulator Output
Capacitor Selection
Two 22μF ceramic output capacitors are required to filter
the inductor current ripple and supply the load transient
current for IOUT = 2.5A. The 1206 package with 10V
minimum voltage rating is recommended for the output
DATA SHEET
AAT1189
High Voltage Step-Down Regulator
capacitors to maintain a minimum capacitance drop with
DC bias.
Output Inductor Selection
The step-down converter utilizes constant frequency
(PWM-mode) voltage mode control. A 4.7μH inductor
value is selected to maintain the desired output current
ripple and minimize the converter’s response time to
load transients. The peak switch current should not
exceed the inductor saturation current, the MOSFET or
the external Schottky rectifier peak current ratings.
Rectifier Selection
When the high-side switch is on, the input voltage will be
applied to the cathode of the Schottky diode. The recti-
fier's rated reverse breakdown voltage must be chosen
at least equal to the maximum input voltage of the step-
down regulator.
When the high-side switch is off, the current will flow
from the power ground to the output through the
Schottky diode and the inductor. The power dissipation
of the Schottky diode during the time-off can be deter-
mined by the following equation:
PD = IOUT · VD ·
1 - VOUT
VIN
Where VD is the voltage drop across the Schottky diode.
Input Capacitor Selection
For low cost applications, a 100μF/25V electrolytic
capacitor is selected to control the voltage overshoot
across the high side MOSFET. A small ceramic capacitor
with voltage rating at least 1.05 times greater than the
maximum input voltage is connected as close as possible
to the input pin (Pin 14) for high frequency decoupling.
Feedback and Compensation Networks
The transfer function of the Error Amplifier is dominated
by the DC Gain and the L COUT output filter of the regula-
tor. This output filter and its equivalent series resistor
(ESR) create a double pole at FLC and a zero at FESR in the
following equations:
Eq.
1:
FLC
=
2
·
π
·
1
L
·
COUT
1. Output current capability may vary and is dependent on package selection, maximum ambient temperature, airflow and PCB heatsinking.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202002A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 31, 2012
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AAT1189.PDF ] | |
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