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PDF AAT1230 Data sheet ( Hoja de datos )
| Número de pieza | AAT1230 | |
| Descripción | Step-Up Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT1230
18V 100mA Step-Up Converter
General Description
Features
SwitchReg™
The AAT1230 is a high frequency, high efficiency
boost converter capable of 18V maximum output
• VIN Range: 2.7V to 5.5V
• Maximum Output: 18V @ 100mA
voltage. The internal power switch can deliver
• True Load Disconnect
100mA load current. It is the ideal power solution to
• Dynamic Voltage Control Options
power OLED, LCD, and CCD applications operat-
• Hysteretic Control
ing from a single cell lithium-ion battery.
— No External Compensation Components
Hysteretic control provides up to 2MHz switching
frequency and fast response to load transients with
small, low-cost external components. The fully
integrated control IC simplifies the design while
reducing the total PCB footprint. The AAT1230
offers a true load disconnect feature which isolates
the load from the power source when EN/SET is
pulled low. This eliminates leakage current and
maintains zero voltage at the output while disabled.
— Excellent Load Transient Response
— High Efficiency at Light Load
• Up to 2MHz Switching Frequency
• Ultra-Small Inductor and Capacitors
• Integrated Low RDS(ON) MOSFET Switches
• Up to 85% Efficiency
• <1µA Shutdown Current
• Integrated Soft Start
• Cycle-by-Cycle Current Limit
• Short-Circuit, Over-Temperature Protection
The output voltage can be dynamically set by acti-
• Available in TSOPJW-12 or TDFN34-16
vating one of two reference levels (FB1 or FB2)
Package
through the SEL logic pin. Optionally, AnalogicTech’s
• -40°C to +85°C Temperature Range
Simple Serial Control™ (S2Cwire™) single wire
interface provides dynamic programmability across
a wide output voltage range through the EN/SET pin.
The
AAT1230
is
available
in
a
Pb-free,
Applicationswww.DataSheet4U.com
thermally-
enhanced 16-pin 3x4mm TDFN low-profile pack-
age or a Pb-free 12-pin TSOPJW package.
• CCD Bias Circuit
• Digital Still Cameras
• LCD Bias Circuit
• Mobile Handsets
• MP3 Players
• OLED Displays
• PDAs and Notebook PCs
Typical Application
Input:
2.7V~5.5V
Enable/Set
Select
C1
2.2µF
VP LIN
VIN
AAT1230
SW
PGND
FB1
EN/SET
FB2
SEL GND
L1
2.2µH
D1
Schottky 18V @ 100mA
R1
78.7kΩ
R2
562Ω
R3
4.99kΩ
C2
2.2µF, 25V
1230.2006.03.1.0
1
1 page  
Typical Characteristics
90
80
70
60
50
40
30
20
0.1
Efficiency vs. Load
(VOUT = 18V)
VIN = 5V
VIN = 4.2V VIN = 3.6V
1 10
Output Current (mA)
100
90
80
70
60
50
40
30
20
0.1
Efficiency vs. Load
(VOUT = 15V)
VIN = 5V
VIN = 4.2V
VIN = 3.6V
1 10
Output Current (mA)
100
Efficiency vs. Load
(VOUT = 12V)
90
80 VIN = 5V
70
60
VIN = 4.2V
VIN = 3.6V
50
40
30
20
0.1 1 10 100
Output Current (mA)
AAT1230
18V 100mA Step-Up Converter
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
DC Regulation
(VOUT = 18V)
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
1 10
Output Current (mA)
100
DC Regulation
(VOUT = 15V)
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
1 10
Output Current (mA)
100
DC Regulation
(VOUT = 12V)
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
1 10
Output Current (mA)
100
1230.2006.03.1.0
5
5 Page 
10000
1000
100
B340LA
MBR0530
ZHCS350
BAT42W
10
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
Forward Voltage (V)
The average diode current is equal to the output
current.
IAVG(TOT) = IOUT
The average output current multiplied by the for-
ward diode voltage determines the loss of the out-
put diode.
PLOSS(DIODE) = IAVG(TOT) · VF
= IOUT · VF
Diode junction temperature can be estimated.
TJ(DIODE) = TAMB + ΘJA · PLOSS(DIODE)
Output diode junction temperature should be
maintained below 110ºC, but may vary depending
on application and/or system guidelines. The
diode θJA can be minimized with additional PCB
area on the cathode. PCB heatsinking the anode
may degrade EMI performance.
The reverse leakage current of the rectifier must be
considered to maintain low quiescent (input) cur-
rent and high efficiency under light load. The recti-
fier reverse current increases dramatically at high
temperatures.
AAT1230
18V 100mA Step-Up Converter
Selecting the Boost Inductor
The AAT1230 controller utilizes hysteretic control
and the switching frequency varies with output load
and input voltage. The value of the inductor deter-
mines the maximum switching frequency of the
AAT1230 boost converter. Increased output induc-
tance decreases the switching frequency, resulting
in higher peak currents and increased output volt-
age ripple. To maintain 2MHz maximum switching
frequency and stable operation, an output inductor
sized from 1.5µH to 2.7µH is recommended.
A better estimate of DMAX is possible when VF is
known.
DMAX
=
(VOUT + VF -
(VOUT +
VIN(MIN))
VF)
Where VF is the Schottky diode forward voltage. If
not known, it can be estimated at 0.5V.
Manufacturer’s specifications list both the inductor
DC current rating, which is a thermal limitation, and
peak inductor current rating, which is determined
by the saturation characteristics. Measurements at
full load and high ambient temperature should be
completed to ensure that the inductor does not sat-
urate or exhibit excessive temperature rise.
The output inductor (L) is selected to avoid satura-
tion at minimum input voltage, maximum output load
conditions. Peak current may be estimated using
the following equation, assuming continuous con-
duction mode. Worst-case peak current occurs at
minimum input voltage (maximum duty cycle) and
maximum load. Switching frequency can be estimat-
ed from the curves and assumes a 2.2µH inductor.
2.0
1.8
VIN = 3.0V
VOUT = 18V
VIN = 3.0V
VOUT = 15V
1.6
1.4
1.2
1.0
0.8
0.6 VIN = 2.7V
0.4 VOUT = 18V
40 50
VIN = 2.7V
VOUT = 15V
60
VIN = 3.6V
VOUT = 18V
VIN = 3.6V
VOUT = 15V
70 80 90
Output Current (mA)
100
1230.2006.03.1.0
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AAT1230.PDF ] | |
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