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PDF AOZ1905 Data sheet ( Hoja de datos )
| Número de pieza | AOZ1905 | |
| Descripción | EZBoost 2A General Purpose Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
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AOZ1905
EZBoost 2A General Purpose Regulator
General Description
The AOZ1905 EZBoost is a high-performance, current-
mode, constant frequency step-up regulator with internal
MOSFET. 600kHz/1.2MHz switching frequency allows
the use of low-profile inductor and capacitors. The
current-mode control ensures easy loop compensation
and fast transient response. The AOZ1905 works from
a 2.7V to 5.5V input voltage range and generates an
output voltage as high as 24V. Other features include
input under-voltage lockout, cycle-by-cycle current limit,
thermal shutdown and soft-start.
The AOZ1905 is available in a tiny 3mm x 3mm 10-pin
DFN package and MSOP8 package and is rated over a
-40°C to +85°C operating temperature range.
Features
● 2.7V to 5.5V input voltage range
● Adjustable output up to 24V
● 600kHz/1.2MHz constant switching frequency
● Cycle-by-cycle current limit
● Thermal overload protection
● Programmable Soft-start
● Small 3mm x 3mm DFN 10L package
● MSOP-8L package
Applications
● LCD TV
● LCD Monitors
● Notebook Displays
● PCMCIA Cards
● Hand-Held Devices
● GPS Power
● TV Tuner
Typical Application
VIN
C1
10µF
C4
IN
FSEL
SS
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OFF ON
EN
L1
4.7µH
D1
LX
AOZ1905
FB
GND
COMP
VOUT
R2 C2
10µF
R1
R3
C3
Rev. 1.5 December 2008
Figure 1. Typical Application Circuit
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Page 1 of 16
1 page  
AOZ1905
Typical Performance Characteristics
Switching Waveform
(IOUT = 400mA, fLX = 1.2MHz, L = 4.7μH)
LVX
5V/div
Switching Waveform
(IOUT = 400mA, fLX = 600kHz, L = 10μH)
LVX
5V/div
IL
0.5A/div
IL
0.5A/div
400ns/div
Load Transient Response
(IOUT = 40mA–400mA, fLX = 1.2MHz, L = 4.7μH)
1μs/div
Load Transient Response
(IOUT = 40mA–400mA, fLX = 600kHz, L = 10μH)
Vo Ripple
200mV/div
Vo Ripple
200mV/div
Io
0.2A/div
200μs/div
Startup Waveform
(ROUT = 200Ω, fLX = 1.2MHz, L = 4.7μH)
VEN
2V/div
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Vo
5V/div
IL
0.5A/div
200μs/div
Io
0.2A/div
200μs/div
Startup Waveform
(ROUT = 200Ω, fLX = 600kHz, L = 4.7μH)
VEN
2V/div
Vo
5V/div
IL
0.5A/div
200μs/div
Rev. 1.5 December 2008
www.aosmd.com
Page 5 of 16
5 Page 
AOZ1905
Application Case for AOZ1905: Multiple-Output, Low-Profile TFT LCD Power Supply
TFT-LCD (Thin Film Transistor Liquid Crystal Display) is
a variant of liquid crystal display (LCD) which uses thin
film transistor (TFT) technology to improve image quality.
TFT LCD is one type of active matrix LCD, which is used
in televisions, flat panel displays and projectors. For this
application, it usually needs several output sources –
Vo1 = 9V, Vo2 = -9V and Vo3 = 26V. Using one
AOZ1905 can easily supply the whole power solution to
obtain three outputs. The detailed schematic is shown in
Figure 4.
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Figure 3. Multiple-Output, Low-Profile TFT LCD Power Solution
Rev. 1.5 December 2008
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Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AOZ1905.PDF ] | |
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