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PDF AAT1106 Data sheet ( Hoja de datos )
| Número de pieza | AAT1106 | |
| Descripción | 600mA Step-Down Converter | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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General Description
The AAT1106 SwitchReg™ is a 1.5MHz constant
frequency current mode PWM step-down convert-
er with a unique adaptive slope compensation
scheme allowing the device to operate with a lower
range of inductor values to optimize size and pro-
vide efficient operation. It is ideal for portable
equipment powered by single-cell Lithium-ion bat-
teries and is optimized for high efficiency, achiev-
www.DataSheet4U.cionmg levels up to 96%.
The AAT1106 can supply up to 600mA load current
from a 2.5V to 5.5V input voltage and the output
voltage can be regulated as low as 0.6V. The
device also can run at 100% duty cycle for low
dropout operation, extending battery life in portable
systems. In addition, light load operation provides
very low output ripple for noise sensitive applica-
tions and the 1.5MHz switching frequency mini-
mizes the size of external components while keep-
ing switching losses low.
The AAT1106 is available in adjustable and fixed
(1.5V, 1.8V) output voltage versions, comes in a
Pb-free, low-profile 5-pin TSOT23 package, and is
rated over the -40°C to +85°C temperature range.
AAT1106
600mA Step-Down Converter
Features
SwitchReg™
• VIN Range: 2.5V to 5.5V
• VOUT: Adjustable 0.6V to VIN
• Up to 600mA Output Current
• Up to 96% Efficiency
• 1.5MHz Switching Frequency
• 100% Duty Cycle Dropout Operation
• Adaptive Slope Compensated Current Mode
Control for Excellent Line and Load Transient
Response
• <1µA Shutdown Current
• Short-Circuit and Thermal Fault Protection
• TSOT23-5 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones, Smartphones
• Digital Still Cameras
• Digital Video Cameras
• Microprocessor and DSP Core Supplies
• MP3 and Portable Media Players
• PDAs
• Wireless and DSL Modems
Typical Application
VIN
2.5V to 5.5V
C1
4.7µF
IN LX
AAT1106-1.8
EN OUT
GND
L1
2.2µH
VOUT
1.8V
C3
10µF
1106.2007.07.1.0
1
1 page  
Typical Characteristics
Efficiency vs. Output Current
(VOUT = 2.5V; L = 2.2µH; TA = 25°C)
100
90
80
70
60
50
40
www.DataSheet4U.com
30
20
10
0
0.1
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
1 10 100
Output Current (mA)
1000
100
90
80
70
60
50
40
30
20
10
0.1
Efficiency vs. Output Current
(VOUT = 1.8V; L = 2.2µH; TA = 25°C)
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1 10 100
Output Current (mA)
1000
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 1.5V; L = 2.2µH; TA = 25°C)
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
1 10 100
Output Current (mA)
1000
AAT1106
600mA Step-Down Converter
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VIN = 3.6V; VOUT = 2.5V; TA = 25°C)
L = 10µH
L = 4.7µH
L = 2.2µH
L = 1.4µH
1 10 100
Output Current (mA)
1000
100
90
80
70
60
50
40
30
20
10
0.1
Efficiency vs. Output Current
(VIN = 3.6V; VOUT = 1.8V; TA = 25°C)
L = 2.2µH
L = 1.4µH
L = 10µH
L = 4.7µH
1 10 100
Output Current (mA)
1000
Efficiency vs. Output Current
(VOUT = 1.2V; L = 2.2µH; TA = 25°C)
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
1 10
100
Output Current (mA)
1000
1106.2007.07.1.0
5
5 Page 
Applications Information
Figure 1 shows the basic application circuit with
AAT1106 fixed output versions.
VIN
2.5V to 5.5V
C1
4.7µF
www.DataSheet4U.com
IN LX
AAT1106-1.8
EN OUT
GND
L1
2.2µH
VOUT
1.8V
C3
10µF
Figure 1: Basic Application Circuit with Fixed
Output Versions.
VIN
2.5V to 5.5V
C1
4.7µF
IN LX
AAT1106-0.6
FB
EN
GND
L1
2.2µH
C2
22pF
R2
634K
R1
316K
VOUT
1.8V
C3
10µF
Figure 2: Basic Application Circuit with
Adjustable Output Version.
Setting the Output Voltage
For applications requiring an adjustable output volt-
age, the AAT1106-0.6 adjustable version can be
externally programmed. Resistors R1 and R2 of
Figure 2 program the output to regulate at a voltage
higher than 0.6V. To limit the bias current required
for the external feedback resistor string while main-
taining good noise immunity, the minimum sug-
gested value for R1 is 59kΩ. Although a larger
value will further reduce quiescent current, it will
also increase the impedance of the feedback node,
making it more sensitive to external noise and
interference. Table 1 summarizes the resistor val-
ues for various output voltages with R1 set to either
59kΩ for good noise immunity or 316kΩ for
reduced no load input current.
The adjustable version of the AAT1106, combined
with an external feed forward capacitor (C2 in
Figure 2), delivers enhanced transient response for
extreme pulsed load applications. The addition of
the feed forward capacitor typically requires a larg-
er output capacitor C3 for stability. The external
resistor sets the output voltage according to the fol-
lowing equation:
1106.2007.07.1.0
AAT1106
600mA Step-Down Converter
VOUT = 0.6V · 1 + RR12
or
R2 = 0V.O6UVT - 1 · R1
VOUT (V)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
R1 = 59k
R2 (kΩ)
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
R1 = 316kΩ
R2 (kΩ)
105
158
210
261
316
365
422
475
634
655
732
1000
1430
Table 1: Resistor Selection for Output Voltage
Setting; Standard 1% Resistor Values
Substituted Closest to the Calculated Values.
Inductor Selection
For most designs, the AAT1106 operates with
inductor values of 1µH to 4.7µH. Low inductance
values are physically smaller, but require faster
switching, which results in some efficiency loss.
The inductor value can be derived from the follow-
ing equation:
L=
VOUT · (VIN - VOUT)
VIN · ∆IL · fOSC
Where ∆IL is inductor ripple current. Large value
inductors lower ripple current and small value
inductors result in high ripple currents. Choose
inductor ripple current approximately 35% of the
maximum load current 600mA, or ∆IL = 210mA.
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT1106.PDF ] | |
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