|
|
PDF AOZ2263QI-15 Data sheet ( Hoja de datos )
| Número de pieza | AOZ2263QI-15 | |
| Descripción | 28V/12A Synchronous EZBuck Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AOZ2263QI-15 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
AOZ2263QI-15
28V/12A Synchronous EZBuckTM Regulator
General Description
The AOZ2263QI-15 is a high-efficiency, easy-to-use DC/
DC synchronous buck regulator that operates up to 28V.
The device is capable of supplying 12A of continuous
output current with an output voltage adjustable down to
0.8V (±1.0%).
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 on-time can be
externally programmed up to 2.6µs.
The device features multiple protection functions such as
VCC under-voltage lockout, cycle-by-cycle current limit,
output over-voltage protection, short-circuit protection,
and thermal shutdown.
The AOZ2263QI-15 is available in a 4mm x 4mm QFN-
22L package and is rated over a -40°C to +85°C ambient
temperature range.
Features
Wide input voltage range
– 2.7V to 28V
12A continuous output current
Output voltage adjustable down to 0.8V (±1.0%)
Low RDS(ON) internal NFETs
– 18mΩ high-side
– 7mΩ low-side
Constant On-Time with input feed-forward
Programmable on-time up to 2.6µs
Selectable PFM light load operation
Ceramic capacitor stable
Adjustable soft start
Ripple reduction
Power Good output
Integrated bootstrap diode
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Thermally enhanced 4mm x 4mm QFN-22L 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. 1.0 December 2015
www.aosmd.com
Page 1 of 16
1 page  
AOZ2263QI-15
Absolute Maximum Ratings
Exceeding the Absolute Maximum Ratings may damage the
device.
Parameter
Rating
IN, TON to AGND
LX to AGND(2)
BST to AGND
SS, PGOOD, FB, EN, VCC, PFM to AGND
PGND to AGND
Junction Temperature (TJ)
Storage Temperature (TS)
ESD Rating(1)
-0.3V to 30V
-0.3V to 30V
-0.3V to 36V
-0.3V to 6V
-0.3V to +0.3V
+150°C
-65°C to +150°C
2kV
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5kΩ 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
(θJA)
Rating
2.7V to 28V
0.8V to 0.85*VIN
-40°C to +85°C
40°C/W
Electrical Characteristics
TA = 25°C, VIN = 12V, VCC = 5V, EN = 5V, unless otherwise specified. Specifications in BOLD indicate a temperature range of
-40°C to +85°C.
Symbol
VIN
VUVLO
Iq
Parameter
IN Supply Voltage
Under-Voltage Lockout Threshold of VCC
Quiescent Supply Current of VCC
IOFF
VFB
IFB
Enable
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
TON_MIN
TON_MAX
TOFF_MIN
On Time
Minimum On Time
Maximum On Time
Minimum Off Time
Conditions
VCC rising
VCC falling
IOUT = 0A, VEN > 2V, PFM
mode
VEN = 0V
TA = 25°C
TA = 0°C to 85°C
Off threshold
On threshold
PFM Mode threshold
Force PWM threshold
RTON = 100kΩ, VIN = 12V
Min.
2.7
Typ.
4.2
3.9
0.15
Max
28
Units
V
V
V
mA
0.792
0.788
1
0.800
0.800
0.5
1
20
0.808
0.812
200
µA
V
V
%
%
nA
0.5 V
1.6 V
100 mV
0.5 V
2.5 V
100 mV
200 ns
100 ns
2.6 µs
300 ns
Rev. 1.0 December 2015
www.aosmd.com
Page 5 of 16
5 Page 
AOZ2263QI-15
When combined with the under-voltage-protection circuit,
this current limit method is effective in almost every
circumstance.
Application Information
The basic AOZ2263QI-15 application circuit is shown in
page 2. Component selection is explained below.
Input Capacitor
The input capacitor must be connected to the IN pins and
PGND pin of the AOZ2263QI-15 to maintain steady input
voltage and filter out the pulsing input current. A small
decoupling capacitor, usually 1µF, should be connected
to the VCC pin and AGND pin for stable operation of the
AOZ2263QI-15. 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:
ΔVIN
=
-------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 4. It can be seen that when VO is half of VIN, CIN 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
0
0 0.5 1
m
Figure 4. ICIN vs. Voltage Conversion Ratio
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:
ΔIL
=
--V----O----
f×L
×
1
–
V-V----IO-N--
The peak inductor current is:
ILpeak = IO + Δ---2--I-L--
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.
Rev. 1.0 December 2015
www.aosmd.com
Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AOZ2263QI-15.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AOZ2263QI-15 | 28V/12A Synchronous EZBuck Regulator | Alpha & Omega Semiconductors |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |