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PDF AUR9705 Data sheet ( Hoja de datos )
| Número de pieza | AUR9705 | |
| Descripción | STEP DOWN DC-DC CONVERTER | |
| Fabricantes | BCD | |
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Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
AUR9705
General Description
The AUR9705 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 1A.
The AUR9705 is available in WDFN-2×2-6 and
TSOT-23-5 packages.
Features
• High Efficiency Buck Power Converter
• Low Quiescent Current
• Output Current: 1A
• 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
WDFN-2×2-6
TSOT-23-5
Nov. 2011 Rev. 1. 0
Figure 1. Package Types of AUR9705
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
AUR9705
Electrical Characteristics
VIN=VEN=5V, VFB=0.6V, L=2.2µH, CIN= 4.7µF, COUT=10µF, TA=25°C, unless otherwise specified.
Parameter
Input Voltage Range
Shutdown Current
Regulated1Feedback
Voltage
Regulated Output
Voltage Accuracy
Peak
Current
Inductor
Oscillator Frequency
PMOSFET RON
NMOSFET RON
Quiescent Current
Symbol
VIN
IOFF
VFB
∆VOUT/VOUT
IPK
fOSC
RON(P)
RON(N)
IQ
Conditions
VEN=0V
For Adjustable Output Voltage
VIN=2.5V to 5.5V,
IOUT=0 to 1A
VFB=0.5V
IOUT =200mA
IOUT =200mA
IOUT=0A, VFB=0.7V
LX Leakage Current ILX VEN=0V, VLX=0V or 5V
Feedback Current
EN Leakage Current
EN High-level Input
Voltage
EN Low-level Input
Voltage
Under Voltage Lock
Out
Hysteresis
Thermal Shutdown
IFB
IEN
VEN_H
VEN_L
VUVLO
TSD
VIN=2.5V to 5.5V
VIN=2.5V to 5.5V
Rising
Min Typ Max Unit
2.5 5.5 V
0.1 1 µA
0.585 0.6 0.615 V
-3 3 %
1.5 A
1.2 1.5 1.8 MHz
0.25 Ω
0.27 Ω
100 µA
0.01 0.1 µA
30
0.01 0.1
1.5
nA
µA
V
0.6 V
1.8 V
0.1 V
160 °C
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
5
5 Page 
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
Typical Application
Data Sheet
AUR9705
For WDFN-2×2-6
For TSOT-23-5
Note 2:
VOUT
= VFB × (1+
R1 ) .
R2
When R2=300kΩ to 60kΩ, the IR2=2µA to 10µA, and R1×C1 should be in the range between 3×10-6 and 6×10-6 for
component selection.
Figure 16. Typical Application Circuits of AUR9705
Table 1. Component Guide
Nov. 2011 Rev. 1. 0
VOUT
(V)
3.3
2.5
1.8
1.2
1.0
R1
(kΩ)
453
320
200
100
68
R2
(kΩ)
100
100
100
100
100
11
C1 L1
(pF) (µH)
13 2.2
18 2.2
30 2.2
56 2.2
82 2.2
BCD Semiconductor Manufacturing Limited
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AUR9705.PDF ] | |
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