Diodes AUR9705 User Manual
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705
Data Sheet
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
Figure 1. Package Types of AUR9705
Sep. 2013 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
1
Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705
Pin Configuration
D Package H Package
(WDFN-2×2-6) (TSOT-23-5)
Pin 1 Ma rk
1
NC
2
EN
VIN
34
Exposed
Pad
6
FB
5
GND
LX
Figure 2. Pin Configuration of AUR9705 (Top View)
1
2
34
5
Pin Description
Pin Number
WDFN-2×2-6 TSOT-23-5
1 NC
2 3 EN Enable signal input, active high
3 1 VIN Power supply input
4 5 LX Connect to inductor
5 2 GND
6 4 FB
Pin Name Function
No internal connection (Floating or connected to
GND)
This pin is the GND reference for the NMOS power
stage. It must be connected to the system ground
Feedback voltage from the output of the power
supply
Sep. 2013 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705
Functional Block Diagram
Figure 3. Functional Block Diagram of AUR9705
Ordering Information
AUR9705
Circuit Type
A: Adjustable Output
Package
WDFN-2×2-6
TSOT-23-5 AUR9705AGH 9705AG Tape & Reel
Temperature
Range
-40 to 80°C
Part Number Marking ID Packing Type
AUR9705AGD 705 Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G" in the part number, are RoHS compliant and
green.
Sep. 2013 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Package
D: WDFN-2×2-6
H: TSOT-23-5
G: Green
Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Supply Input Voltage VIN
Enable Input Voltage VEN
Switch Output Voltage (Note 2) VLX
Power Dissipation (On PCB, TA=25°C) PD
Thermal Resistance (Junction to Ambient,
Simulation)
Thermal Resistance (Junction to Case,
Simulation)
Operating Junction Temperature TJ
Operating Temperature TOP
Storage Temperature T
ESD (Human Body Model) V
ESD (Machine Model) VMM
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Note 2: If the switching spike duration is less than 100ns, the absolute maximum range of V
to 7.5V.
θ
θ
STG
HBM
JA
JC
0 to 6.0
-0.3 to VIN+0.3
-0.3 to VIN+0.3
1.89
53
0.85
160
-40 to 85
-55 to 150
2000
200
should be -4.5V
LX
V
V
V
W
°C/W
°C/W
°C
°C
°C
V
V
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Supply Input Voltage VIN 2.5 5.5 V
Junction Temperature Range TJ -20 125 °C
Ambient Temperature Range TA -40 80 °C
Sep. 2013 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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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, C
Parameter Symbol Conditions Min Typ Max Unit
Input Voltage Range VIN 2.5 5.5 V
=10μF, TA=25°C, unless otherwise specified.
OUT
Shutdown Current I
Regulated1Feedback
Voltage
Regulated Output
Voltage Accuracy
ΔV
Peak Inductor
Current
Oscillator Frequency f
PMOSFET RON R
NMOSFET RON R
Quiescent Current IQ I
LX Leakage Current ILX
V
OFF
V
For Adjustable Output Voltage 0.585 0.6 0.615 V
FB
OUT/VOUT
I
OSC
ON(P)
ON(N)
V
PK
1.2 1.5 1.8 MHz
I
I
=0V 0.1 1 μA
EN
=2.5V to 5.5V,
V
IN
=0 to 1A
I
OUT
=0.5V 1.5 A
FB
=200mA 0.25 Ω
OUT
=200mA 0.27 Ω
OUT
=0A, VFB=0.7V 100 μA
OUT
V
=0V, VLX=0V or 5V
EN
-3 3 %
0.01 0.1 μA
Feedback Current IFB 30 nA
EN Leakage Current IEN 0.01 0.1 μA
EN High-level Input
Voltage
EN Low-level Input
Voltage
Under Voltage Lock
Out
V
VIN=2.5V to 5.5V 1.5 V
EN_H
V
VIN=2.5V to 5.5V 0.6 V
EN_L
V
Rising 1.8 V
UVLO
Hysteresis 0.1 V
Thermal Shutdown TSD 160 °C
Sep. 2013 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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