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PDF AAT1123 Data sheet ( Hoja de datos )
| Número de pieza | AAT1123 | |
| Descripción | Step-Down Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT1123
1MHz Step-Down Converter
General Description
Features
SwitchReg™
The AAT1123 SwitchReg™ is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. It is a 1MHz step-down
• VIN Range: 2.7V to 5.5V
• VOUT Adjustable Down to 0.6V
— Fixed or Adjustable Version
converter with an input voltage range of 2.7V to
• Fast Turn-On Time (100µs Typical)
5.5V and output as low as 0.6V. Its low supply cur-
• 25µA No Load Quiescent Current
rent, small size, and high switching frequency
• Up to 97% Efficiency
make the AAT1123 the ideal choice for portable
• Output Current Up to 600mA
applications.
• 1MHz Switching Frequency
The AAT1123 is available in either a fixed version
with internal feedback or a programmable version
with external feedback resistors. It can deliver up
to 600mA of load current while maintaining a low
25µA no load quiescent current. The 1MHz switch-
ing frequency minimizes the size of external com-
ponents while keeping switching losses low. The
• Soft Start
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• 0.1µA Shutdown Current
• SC70JW-8 Package
• Temperature Range: -40°C to +85°C
AAT1123 feedback and control delivers excellent
load regulation and transient response with a small
output inductor and capacitor.
The AAT1123 is designed to maintain high efficien-
Applications
cy throughout the
fast turn-on time.
operating
range
and
provides
•
•www.DataSheet4U.com
Cellular Phones
Digital Cameras
The AAT1123 is available in a space-saving
• Handheld Instruments
2.0x2.1mm SC70JW-8 package and is rated over
• Microprocessor / DSP Core / IO Power
the -40°C to +85°C temperature range.
• PDAs and Handheld Computers
• USB Devices
Typical Application (Fixed Output Voltage)
VIN
C2
4.7μF
U1
AAT1123
3 VIN
LX 4
1 EN
OUT 2
5 AGND PGND 7
8 PGND PGND 6
L1
4.7μH
VO
C1
22μF
100
90
80
70
60
0.1
AAT1123 Efficiency
(VOUT = 2.5V; L = 10μH)
VIN = 3.3V
1 10 100
Output Current (mA)
1000
1123.2006.05.1.5
1
1 page  
AAT1123
1MHz Step-Down Converter
Typical Characteristics
Efficiency vs. Load
(VOUT = 3.3V; L = 10μH)
100
90 VIN = 3.9V
80 VIN = 4.2V
70
60
0.1
1 10 100
Output Current (mA)
1000
DC Regulation
(VOUT = 3.3V; L = 10μH)
3.0
2.0
VIN = 4.2V
1.0
0.0
-1.0 VIN = 3.9V
-2.0
-3.0
0.1
1
10 100
Output Current (mA)
1000
Efficiency vs. Load
(VOUT = 2.5V; L = 10μH)
100
VIN = 3.3V
90
VIN = 3.0V VIN = 3.6V
80
70
60
0.1
1 10 100
Output Current (mA)
DC Regulation
(VOUT = 2.5V; L = 10μH)
3.0
2.0 VIN = 3.3V
1.0 VIN = 3.6V
0.0
-1.0 VIN = 3.0V
-2.0
1000
-3.0
0.1
1 10 100
Output Current (mA)
1000
Efficiency vs. Load
(VOUT = 1.5V; L = 4.7μH)
100
VIN = 2.7V
90
VIN = 3.6V
80
VIN = 4.2V
70
60
50
0.1
1 10 100
Output Current (mA)
1000
DC Regulation
(VOUT = 1.5V; L = 4.7μH)
3.0
2.0 VIN = 4.2V
1.0 VIN = 3.6V
0.0
-1.0 VIN = 2.7V
-2.0
-3.0
0.1
1
10 100
Output Current (mA)
1000
1123.2006.05.1.5
5
5 Page 
The maximum input capacitor RMS current is:
IRMS = IO ·
VO
VIN
·
⎛⎝1 -
VO ⎞
VIN ⎠
The input capacitor RMS ripple current varies with
the input and output voltage and will always be less
than or equal to half of the total DC load current.
VO · ⎛1 - VO ⎞ = D · (1 - D) = 0.52 = 1
VIN ⎝ VIN ⎠
2
for VIN = 2 x VO
I =RMS(MAX)
IO
2
AAT1123
1MHz Step-Down Converter
The term
VO
VIN
·
⎛⎝1 -
VO ⎞
VIN ⎠
appears in both the input volt-
age ripple and input capacitor RMS current equations
and is a maximum when VO is twice VIN. This is why
the input voltage ripple and the input capacitor RMS
current ripple are a maximum at 50% duty cycle.
The input capacitor provides a low impedance loop
for the edges of pulsed current drawn by the
AAT1123. Low ESR/ESL X7R and X5R ceramic
capacitors are ideal for this function. To minimize
stray inductance, the capacitor should be placed
as closely as possible to the IC. This keeps the
high frequency content of the input current local-
ized, minimizing EMI and input voltage ripple.
The proper placement of the input capacitor (C2) can
be seen in the evaluation board layout in Figure 2.
Figure 2: AAT1123 Evaluation Board
Top Side.
Figure 3: Exploded View of Evaluation
Board Top Side Layout.
1123.2006.05.1.5
Figure 4: AAT1123 Evaluation Board
Bottom Side.
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AAT1123.PDF ] | |
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