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PDF AOZ1232-01 Data sheet ( Hoja de datos )
| Número de pieza | AOZ1232-01 | |
| Descripción | 28V/6A Synchronous EZBuck Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
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AOZ1232-01
28V/6A Synchronous EZBuckTM Regulator
General Description
The AOZ1232-01 is a high-efficiency, easy-to-use DC/DC
synchronous buck regulator that operates up to 28V.
The device is capable of supplying 6A of continuous
output current with an output voltage adjustable down to
0.8V (±1.0%).
The AOZ1232-01 integrates an internal linear regulator
to generate 5.3V VCC from input. If input voltage is lower
than 5.3V, the linear regulator operates at low drop-
output mode, which allows the VCC voltage is equal to
input voltage minus the drop-output voltage of the
internal linear regulator.
A proprietary constant on-time PWM control with input
feed-forward results in ultra-fast transient response while
maintaining relatively constant switching frequency over
the entire input voltage range. The switching frequency
can be externally programmed up to 1MHz.
The device features multiple protection functions such as
VCC under-voltage lockout, cycle-by-current limit, output
over-voltage protection, short-circuit protection, as well
as thermal shutdown.
The AOZ1232-01 is available in a 5mm x 5mm QFN-30L
package and is rated over a -40°C to +85°C ambient
temperature range.
Features
Wide input voltage range
– 2.7V to 28V
6A continuous output current
Output voltage adjustable down to 0.8V (±1.0%)
Low RDS(ON) internal NFETs
– 35m high-side
– 12m low-side SRFET™
Constant On-Time with input feed-forward
Programmable frequency up to 1MHz
Internal 5.3V/20mA linear regulator
Ceramic capacitor stable
Adjustable soft start
Power Good output
Integrated bootstrap diode
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Thermallywww.DataSheet.net/ enhanced 5mm x 5mm QFN-30L package
Applications
Portable computers
Compact desktop PCs
Servers
Graphics cards
Set-top boxes
LCD TVs
Cable modems
Point-of-load DC/DC converters
Telecom/Networking/Datacom equipment
Rev. 1.3 October 2012
www.aosmd.com
Page 1 of 18
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
AOZ1232-01
Absolute Maximum Ratings
Exceeding the Absolute Maximum Ratings may damage the
device.
Parameter
Rating
IN, AIN, TON, PFM to AGND
-0.3V to 30V
LX to AGND
-2V to 30V
BST to AGND
-0.3V to 36V
SS, PGOOD, FB, EN to AGND
-0.3V to 6V
PGND to AGND
-0.3V to +0.3V
Junction Temperature (TJ)
Storage Temperature (TS)
ESD Rating(1)
+150°C
-65°C to +150°C
2kV
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5k in series with 100pF.
2. LX to PGND Transient (t<20ns) ------ -7V to VIN + 7V.
Maximum Operating Ratings
The device is not guaranteed to operate beyond the
Maximum Operating ratings.
Parameter
Supply Voltage (VIN)
Output Voltage Range
Ambient Temperature (TA)
Package Thermal Resistance
HS MOSFET
LS MOSFET
PWM Controller
Rating
2.7V(1) to 28V
0.8V to 0.85*VIN
-40°C to +85°C
25°C/W
20°C/W
50°C/W
Note:
1. Connect VCC and AIN to external 5V for VIN = 2.7V ~ 6.5V
application.
Electrical Characteristics
TA = 25°C, VIN = 12V, EN = 5V, unless otherwise specified. Specifications in BOLD indicate a temperature range of -40°C to +85°C.
Symbol
VIN
VUVLO
Iq
IOFF
VFB
IFB
Enable
Parameter
IN Supply Voltage
Under-Voltage Lockout Threshold of Vcc
Quiescent Supply Current of Vcc
Shutdown Supply Current
Feedback Voltage
Load Regulation
Line Regulation
FB Input Bias Current
VEN EN Input Threshold
VEN_HYS EN Input Hysteresis
PFM Control
VPFM PFM Input Threshold
VPFMHYS PFM Input Hysteresis
Modulator
TON On Time
TON_MIN Minimum On Time
TOFF_MIN Minimum Off Time
Conditions
Vcc rising www.DataSheet.net/
Vcc falling
IOUT = 0, VFB = 1.0V, VEN > 2V
VEN = 0V
TA = 25°C
TA = 0°C to 85°C
Off threshold
On threshold
PFM Mode threshold
Force PWM threshold
RTON = 100k, VIN = 12V
RTON = 100k, VIN = 24V
Min.
2.7
3.2
0.792
0.788
Typ.
4.0
3.7
2
1
0.800
0.800
0.5
1
Max
28
4.4
3
20
0.808
0.812
200
Units
V
V
mA
A
V
%
%
nA
2.5 0.5 V
100 mV
2.5 0.5 V
100 mV
200 250 300
150
100
250
ns
ns
ns
Rev. 1.3 October 2012
www.aosmd.com
Page 5 of 18
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
AOZ1232-01
Application Information
The basic AOZ1232-01 application circuit is shown in
pages 2 and 3. Component selection is explained below.
Input Capacitor
The input capacitor must be connected to the IN pins and
PGND pin of the AOZ1232-01 to maintain steady input
voltage and filter out the pulsing input current. A small
decoupling capacitor, usually 1F, should be connected
to the VCC pin and AGND pin for stable operation of the
AOZ1232-01. The voltage rating of input capacitor must
be greater than maximum input voltage plus ripple
voltage.
The input ripple voltage can be approximated by
equation below:
-------I-O---------
f CIN
1
–
V-V----IO-N--
-V----O---
VIN
Since the input current is discontinuous in a buck
converter, the current stress on the input capacitor is
another concern when selecting the capacitor. For a buck
circuit, the RMS value of input capacitor current can be
calculated by:
ICIN_RMS = IO
-V----O---
1
–
-V----O---
VIN VIN
if let m equal the conversion ratio:
-V----O--- = m
VIN
The relation between the input capacitor RMS current
and voltage conversion ratio is calculated and shown in
Figure 3. It can be seen that when VO is half of VIN, CIN it
is under the worst current stress. The worst current
stress on CIN is 0.5 x IO.
0.5
0.4
ICIN_RMS(m) 0.3
IO 0.2
0.1
For reliable operation and best performance, the input
capacitors must have current rating higher than ICIN-RMS
at worst operating conditions. Ceramic capacitors are
preferred for input capacitors because of their low ESR
and high ripple current rating. Depending on the
application circuits, other low ESR tantalum capacitor or
aluminum electrolytic capacitor may also be used. When
selecting ceramic capacitors, X5R or X7R type dielectric
ceramic capacitors are preferred for their better
temperature and voltage characteristics. Note that the
ripple current rating from capacitor manufactures is
based on certain amount of life time. Further de-rating
may be necessary for practical design requirement.
Inductor
The inductor is used to supply constant current to output
when it is driven by a switching voltage. For given input
and output voltage, inductance and switching frequency
together decide the inductor ripple current, which is:
IL
=
--V----O----
fL
1
–
V-V----IO-N--
The peak inductor current is:
ILpeak
=
IO
+
-----I-L--
2
www.DataSheet.net/
High inductance gives low inductor ripple current but
requires a larger size inductor to avoid saturation. Low
ripple current reduces inductor core losses. It also
reduces RMS current through inductor and switches,
which results in less conduction loss. Usually, peak to
peak ripple current on inductor is designed to be 30% to
50% of output current.
When selecting the inductor, make sure it is able to
handle the peak current without saturation even at the
highest operating temperature.
The inductor takes the highest current in a buck circuit.
The conduction loss on the inductor needs to be checked
for thermal and efficiency requirements.
Surface mount inductors in different shapes and styles
are available from Coilcraft, Elytone and Murata.
Shielded inductors are small and radiate less EMI noise,
but they do cost more than unshielded inductors. The
choice depends on EMI requirement, price and size.
0
0 0.5 1
m
Figure 3. ICIN vs. Voltage Conversion Ratio
Rev. 1.3 October 2012
www.aosmd.com
Page 11 of 18
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AOZ1232-01.PDF ] | |
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