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PDF AUR9703 Data sheet ( Hoja de datos )
| Número de pieza | AUR9703 | |
| Descripción | STEP DOWN DC-DC CONVERTER | |
| Fabricantes | BCD | |
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Data Sheet
1.5MHz, 800mA, STEP DOWN DC-DC CONVERTER AUR9703
General Description
The AUR9703 is a high efficiency step-down
DC-DC voltage converter. The chip operation is
optimized using constant frequency, peak-current
mode architecture with built-in synchronous power
MOSFET switchers and internal compensators to
reduce external part counts. It is automatically
switching between the normal PWM mode and LDO
mode to offer improved system power efficiency
covering a wide range of loading conditions.
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 included Soft Start (SS), Under
Voltage Lock Out (UVLO), and Thermal Shutdown
Detection (TSD) to provide reliable product
applications.
The device is available in adjustable output voltage
versions ranging from 1V to 3.3V, and is able to
deliver up to 800mA.
The AUR9703 is available in TSOT-23-5 package.
Features
• High Efficiency Buck Power Converter
• Low Quiescent Current
• Output Current: 800mA
• Adjustable Output Voltage from 1V to 3.3V
• Wide Operating Voltage Range: 2.5V to 5.5V
• Built-in Power Switches for Synchronous
Rectification with High Efficiency
• Feedback Voltage: 600mV
• 1.5MHz Constant Frequency Operation
• Automatic PWM/LDO Mode Switching Control
• Thermal Shutdown Protection
• Low Drop-out Operation at 100% Duty Cycle
• No Schottky Diode Required
Applications
• Mobile Phone, Digital Camera and MP3 Player
• Headset, Radio and Other Hand-held Instrument
• Post DC-DC Voltage Regulation
• PDA and Notebook Computer
Nov. 2011 Rev. 1 .0
TSOT-23-5
Figure 1. Package Type of AUR9703
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
1.5MHz, 800mA, STEP DOWN DC-DC CONVERTER AUR9703
Electrical Characteristics
VIN=5V, VOUT=3.3V, VFB=0.6V, L=2.2µH, CIN=4.7µF, COUT=10µF, TA=25°C, IMAX=800mA. Unless
otherwise specified.
Parameter
Input Voltage Range
Shutdown Current
Regulated1Feedback
Voltage
Regulated Output
Voltage Accuracy
Peak Inductor
Current
Oscillator Frequency
PMOSFET RON
NMOSFET RON
Quiescent Current
LX Leakage Current
Feedback Current
Soft Start Time
EN Leakage Current
EN High-level Input
Voltage
EN Low-Level Input
Voltage
Under Voltage Lock
Out
Hysteresis
Thermal Shutdown
Symbol
VIN
IOFF
VFB
∆VOUT/VOUT
IPK
fOSC
RON(P)
RON(N)
IQ
ILX
IFB
tSS
IEN
VEN_H
VEN_L
VUVLO
TSD
Conditions
Min Typ Max Unit
2.5 5.5 V
VEN=0
0.1 1 µA
For Adjustable Output Voltage 0.585 0.6 0.615
VIN=2.5V to 5.5V,
IOUT=0 to 800mA
-3 3
VIN=5V, VFB=0.5V
1.2
V
%
A
VIN=5V
1.2 1.5 1.8 MHz
VIN=5V, IOUT=200mA
0.25 Ω
VIN=5V, IOUT=200mA
0.27 Ω
IOUT=0A, VFB= 0.7V
100 µA
VEN=0V, VLX=0V or 5V,
VIN=5V
0.1 1 µA
30 nA
200 µs
0.01 0.1 µA
VIN=2.5V to 5.5V
1.5
V
VIN=2.5V to 5.5V
0.6 V
1.8 V
0.1 V
160 °C
Nov. 2011 Rev. 1 .0
BCD Semiconductor Manufacturing Limited
5
5 Page 
Data Sheet
1.5MHz, 800mA, STEP DOWN DC-DC CONVERTER AUR9703
Typical Performance Characteristics (Continued)
Figure 24. Shut Down through EN
(VIN=5V, VEN=5V to 0V, VOUT=3.3V, IOUT=800mA)
Figure 25. Start Up through VIN
(VIN=0 to 5V, VOUT=3.3V, IOUT=800mA)
Figure 26. Shut Down through VIN
(VIN=5.0 to 0V, VOUT=3.3V, IOUT=800mA)
Figure 27. Short Circuit Protection
(VIN=5.0V, VOUT =3.3V, IOUT=800mA)
Nov. 2011 Rev. 1 .0
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
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