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PDF AUR9710 Data sheet ( Hoja de datos )
| Número de pieza | AUR9710 | |
| Descripción | Step-down DC-DC Converter | |
| Fabricantes | BCD | |
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Data Sheet
1.5MHz, 1A, Step-down DC-DC Converter
AUR9710
General Description
The AUR9710 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 including Soft Start (SS), Under
Voltage Lock Out (UVLO) and Thermal Shutdown
Detection (TSD) are integrated 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 AUR9710 is available in WDFN-3×3-10
package.
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 Switchers for Synchronous
Rectification with High Efficiency
• Feedback Voltage: 800mV
• 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
• Battery Powered Devices
• Mobile Phone, Digital Camera and MP3 Player
• Headset, Radio and Other Hand-held Instruments
• PCI Card, WiFi card
• PDA and Notebook Computer
WDFN-3×3-10
Figure 1. Package Type of AUR9710
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
1.5MHz, 1A, Step-down DC-DC Converter
AUR9710
Electrical Characteristics
VIN=5V, VFB=0.8V, L=1.2µH, CIN=47µF, COUT=47µF, 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
Symbol
VIN
IOFF
VFB
∆VOUT/VOUT
IPK
fOSC
RON(P)
RON(N)
Conditions
VEN=0V
For Adjustable Output Voltage
VIN=2.5V to 5.5V, IOUT=0 to 1A
VFB=0.7V
IOUT=200mA
IOUT =200mA
Min Typ Max Unit
2.5 5.5 V
0.1 1 µA
0.780 0.8 0.820 V
-3 3 %
1.5 A
1.2 1.5 1.8 MHz
0.28 Ω
0.25 Ω
SW Leakage Current ISW VEN=0V, VSW=0V or 5V
0.01 0.1 µA
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
Hysteresis
30
0.01 0.1
1.5
0.6
1.8
0.1
150
nA
µA
V
V
V
V
°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
AUR9710
Note 2:
VOUT
= VFB × (1+
R1 ) ; VFB=0.8V
R2
When R2=400kΩ to 80kΩ, 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 Circuit of AUR9710
Nov. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AUR9710.PDF ] | |
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