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PDF AUR9718 Data sheet ( Hoja de datos )
| Número de pieza | AUR9718 | |
| Descripción | STEP DOWN DC-DC CONVERTER | |
| Fabricantes | BCD | |
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Data Sheet
1.5MHz, 1.5A, Step-down DC-DC Converter
AUR9718
General Description
The AUR9718 is a high efficiency step-down
DC-DC voltage converter. The chip operation is
optimized by peak-current mode architecture with
built-in synchronous power MOSFET switchers.
The oscillator and timing capacitors are all built-in
providing an internal switching frequency of 1.5MHz
that allows the use of small surface mount inductors
and capacitors for portable product implementations.
Additional features including Soft Start (SS), Under
Voltage Lock Out (UVLO), Thermal Shutdown
Detection (TSD) and short circuit protection are
integrated to provide reliable product applications.
The device is available in adjustable output voltage
versions ranging from 0.8V to 0.9×VIN when input
voltage range is from 2.7V to 5.5V, and is able to
deliver up to 1.5A.
The AUR9718 is available in DFN-3×3-6 package.
Features
• High Efficiency Buck Power Converter
• Low RDS(ON) Internal Switches : 150mΩ
• Output Current: 1.5A
• Adjustable Output Voltage from 0.8V to 0.9×VIN
• Wide Operating Voltage Range: 2.7V to 5.5V
• Built-in Power Switchers for Synchronous
Rectification with High Efficiency
• Feedback Voltage: 800mV
• 1.5MHz Switching Frequency
• Thermal Shutdown Protection
• Low Drop-out Operation at 90% Duty Cycle
• No Schottky Diode Required
Applications
• LCD TV
• Set Top Box
• Post DC-DC Voltage Regulation
• PDA and Notebook Computer
DFN-3×3-6
Figure 1. Package Type of AUR9718
May. 2012 Rev. 1.0
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
1.5MHz, 1.5A, Step-down DC-DC Converter
AUR9718
Electrical Characteristics
VIN_SW=VIN_A=VEN=5V, VOUT=1.2V, VFB=0.8V, L=3.3µH, CIN=4.7µF, COUT=22µF, TA=25°C, unless
otherwise specified.
Parameter
Input Voltage Range
Shutdown Current
Active Current
Regulated Feedback
Voltage
Regulated Output
Voltage Accuracy
Peak Inductor
Current
Oscillator Frequency
PMOSFET RON
NMOSFET RON
EN High-level Input
Voltage
EN Low-level Input
Voltage
EN Input Current
Soft-start time
Maximum
Cycle
Duty
Under Voltage Lock
Out
Hysteresis
Thermal Shutdown
Symbol
VIN
IOFF
ION
VFB
∆VOUT/VOUT
IPK
fOSC
RDS(ON)P
RDS(ON)N
VEN_H
VEN_L
IEN
tSS
DMAX
VUVLO
TSD
Conditions
VIN=VIN_SW=VIN_A
VEN=0V
VFB=0.95V
Min Typ Max Unit
2.7 5.5 V
4 µA
460 µA
For Adjustable Output Voltage 0.784 0.8 0.816
VIN=2.7V to 5.5V, IOUT=10mA
to 2A
-3
3
V
%
1.7 2.5
A
ISW=0.75A
ISW=0.75A
1.2 1.5 1.8 MHz
150 mΩ
150 mΩ
1.5 V
Rising
Falling
Hysteresis
Hysteresis=30°C
0.4 V
2 µA
450 µS
90 %
2.4
V
2.3
0.1 V
150 °C
May. 2012 Rev. 1.0
BCD Semiconductor Manufacturing Limited
5
5 Page 
1.5MHz, 1.5A, Step-down DC-DC Converter
Typical Performance Characteristics (Continued)
Data Sheet
AUR9718
VSW
2V/div
VIN
1V/div
VOUT
1V/div
IOUT
1A/div
VSW
2V/div
VIN
1V/div
VOUT
1V/div
IOUT
1A/div
Time 2ms/div
Figure 24. Dynamic Mode
(ILOAD=200mA to 1200mA, VIN=5V, VOUT=3.3V)
Time 100µs/div
Figure 25. Dynamic Mode (Rising)
VSW
2V/div
VIN
1V/div
VOUT
1V/div
IOUT
1A/div
Time 100µs/div
Figure 26. Dynamic Mode (Falling)
VEN
2V/div
VIN
1V/div
IOUT
1A/div
VOUT
1V/div
Time 200µs/div
Figure 27. EN Pin L to H
(VIN=5V, VOUT=3.3V, IOUT=100mA)
May. 2012 Rev. 1.0
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AUR9718.PDF ] | |
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