|
|
PDF AIC2363 Data sheet ( Hoja de datos )
| Número de pieza | AIC2363 | |
| Descripción | PWM/PSM Step-Down Converter | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AIC2363 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
AIC2363
3.2A 550k/1.1MHz Synchronous PWM/PSM
Step-Down Converter with High Light-load Efficiency
FEATURES
DESCRIPTION
2.5V to 6V Input Voltage Range
The AIC2363 is a low-noise, pulse-width-
Adjustable Output Voltage from 0.8V to Vin
modulated (PWM), DC-DC step-down converter.
3.2A Guaranteed Output Current
The device features an internal synchronous
88% Efficiency at Heavy Load
rectifier for high efficiency; it requires no external
(Vin=5V, Vout=3.3V, Iout=3.2A)
Schottky diode. The AIC2363 is ideally suited for
95% Efficiency at Moderate Load
Li-Ion battery applications. Automatic PWM/PSM
(Vin=5V, Vout=3.3V, Iout=1.5A)
mode extends battery life and enhance
91% Efficiency at Light Load
efficiency by switching to a pulse-skipping-
(Vin=5V, Vout=3.3V, Iout=50mA)
Low RDS(ON) Internal Switches: 110mΩ
modulated mode during light load. Shutdown
mode places the device in standby, reducing
No Schottky Diode Required
supply current to under 2µA.
100% Duty Cycle in Low Dropout Operation
Other features of the AIC2363 include high
Fixed 550k/1.1MHz Operating Frequency
efficiency for all load range, low dropout voltage,
Optional Soft-Start Internal Fixed 1ms Soft-
short circuit protection, and over temperature
Start (in SOP-8)
protection.
APPLICATIONS
LCD TV
Portable Products
Wireless and DSL Modems
Solid-State Drives
Battery-Operated Devices (1 Li-Ion or 3
NiMH/ NiCd)
Analog Integrations Corporation
Si-Soft Research Center
3A1, 1 Li-Hsin 1st Rd., Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
DS-2363G-04 20140219
www.analog.com.tw
1
1 page  
AIC2363
ELECTRICAL CHARACTERISTICS
(TA=25C, VIN=3.3V, unless otherwise specified.) (Note1)
PARAMETER
CONDITIONS
Input Voltage Range
Under Voltage Lockout Threshold
Output Adjustment Range
VCC Rising
VCC Falling
Shutdown Current
Quiescent Current
(SOP-8 Package)
VEN = 0V
IOUT = 0A, VFB = 1V
No Switching
Quiescent Current
(DFN-10 Package)
IOUT = 0A, VFB = 1V
No Switching
Standby Current
IOUT = 0A, Switching
SYMBOL
VIN
VUVLO(R)
VUVLO(F)
VOUT
ISD
IQ
IQ
ISB
MIN
2.5
0.8
TYP
2.3
2.1
1
200
300
600
MAX
6
VIN
2
UNITS
V
V
V
V
A
380 A
480 A
900 A
Feedback Reference Voltage
VOUT Line Regulation
FB Leakage Current
EN Supply Current
En Logic High
VIN = 2.5V to 5.5V
VREF
0.784 0.8 0.816
V
ΔVOUT
-2
2%
IFB 0.1 0.2 A
IEN 3.5 A
1.5 VCC V
EN Logic Low
0 0.5 V
P-Channel On-Resistance
N-Channel On-Resistance
Switch Leakage Current
Peak Inductor Current
ILX = 0.2A
ILX = 0.2A
VEN = 0V, VIN = 5.5V
RDSH(ON)
RDSL(ON)
IPK 4
110
80
0.1
5
m
m
1 A
A
Oscillator Frequency (A Version)
fOSCA
920 1100 1280 kHz
Oscillator Frequency (B Version)
Maximum Duty Cycle
Thermal Shutdown Trip Point
Thermal Shutdown Hysteresis
PGood Leakage Current
PGOOD=5V
fOSCB
DMAX
TOTP
TOTP_HYS
IPGOOD
468
100
550
150
25
632 kHz
%
°C
°C
1 A
PGood Voltage Low IPGOOD=1mA VPGL 0.2 V
PGood High Window
With respect to nominal
output, TA=TJ=25°C
±5 ±10 ±15 %
PGood Delay Time
Vout Rising or Vout Fal-
ling
1024
clks
Soft-Start Charge Current
ISS 4 A
Note 1: Specifications are production tested at TA=25C. Specifications over the -40C to 85C operating tem-
perature range are assured by design, characterization and correlation with Statistical Quality Con-
trols (SQC).
5
5 Page 
AIC2363
switching cycle is begun. While the input voltage
approaches the output voltage, the switching
frequency decreases gradually to smoothly transit to
100% duty cycle operation.
If input voltage is very close to output voltage, the
switching mode goes from pure PWM mode to 100%
duty cycle operation. During this transient state
mentioned above, large output ripple voltage may
appear on output terminal.
Components Selection
Inductor
The inductor selection depends on the current ripple of
inductor, the input voltage and the output voltage.
L
VOUT
fOSC IL
1
VOUT
VIN
Accepting a large current ripple of inductor allows the
use of a smaller inductance. However, higher current
ripple of inductor can cause higher output ripple
voltage and large core loss. By setting an acceptable
current ripple of inductor, a suitable inductance can be
obtained from above equation.
In addition, it is important to ensure the inductor
saturation current exceeds the peak value of inductor
current in application to prevent core saturation. The
peak value of inductor current can be calculated
according to the following equation.
IPEAK
IOUTmax
VOUT
2 fOSC
L 1
VOUT
VIN
Input Capacitor and Output Capacitor
To prevent the high input voltage ripple and noise
resulted from high frequency switching, the use of low
ESR ceramic capacitor for the maximum RMS current
is recommended. The approximated RMS current of
the input capacitor can be calculated according to the
following equation.
ICINRMS
V2
I OUT(MAX)
OUT
VIN VOUT
VI2N
IL2
12
The selection of output capacitor depends on the
required output voltage ripple. The output voltage
ripple can be expressed as:
VOUT
IL
8 fOSC COUT
ESR IL
For lower output voltage ripple, the use of low ESR
ceramic capacitor is recommended. The tantalum
capacitor can also be used well, but its ERS is larger
than that of ceramic capacitor.
When choosing the input and output ceramic
capacitors, X5R and X7R types are recommended
because they retain their capacitance over wider
ranges of voltage and temperature than other types.
Output Voltage Programming
By connecting a resistive divider R2 and R3, the output
voltage of AIC2363 step-down converter can be set.
VOUT can be calculated as:
VOUT
0.8 1
R2
R3
The resistive divider should sit as close to VFB pin as
possible.
Layout Consideration
In order to ensure a proper operation of AIC2363, the
following points should be managed comprehensively.
1. The input capacitor and VIN should be placed as
close as possible to each other to reduce the input
voltage ripple and noise.
2. The output loop, which is consisted of the inductor,
the internal main power switch, the internal
synchronous power switch and the output capaci-
tor, should be kept as small as possible.
3. The routes with large current should be kept short
and wide.
4. Logically the large current on the converter should
flow at the same direction.
5. The VFB pin should be connected to the feedback
resistors directly and the route should be away
from the noise sources.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AIC2363.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AIC2362 | PWM/PSM Step-Down Converter | Analog Intergrations Corporation |
| AIC2363 | PWM/PSM Step-Down Converter | Analog Intergrations Corporation |
| AIC2364 | 4A Synchronous PWM/PSM Step-Down Converter | Analog Intergrations Corporation |
| 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 |