Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
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.
AUR9705
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
1
BCD Semiconductor Manufacturing Limited
Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
Pin Configuration
D Package
(WDFN-2×2-6)
H Package
(TSOT-23-5)
AUR9705
Pin 1 Mark
NC
EN
VIN
1
6
FB
GND
LX
1
2
3
5
2
Exposed
Pad
5
3
4
4
Figure 2. Pin Configuration of AUR9705 (Top View)
Pin Description
Pin Number
WDFN-2×2-6 TSOT-23-5
1
2
3
4
5
6
3
1
5
2
4
Pin Name
NC
EN
VIN
LX
GND
FB
Function
No internal connection (Floating or connected to
GND)
Enable signal input, active high
Power supply input
Connect to inductor
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
2
BCD Semiconductor Manufacturing Limited
Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
Functional Block Diagram
AUR9705
Figure 3. Functional Block Diagram of AUR9705
Ordering Information
AUR9705
Package
D: WDFN-2×2-6
H: TSOT-23-5
G: Green
Part Number
AUR9705AGD
AUR9705AGH
705
9705AG
Circuit Type
A: Adjustable Output
Package
WDFN-2×2-6
TSOT-23-5
Temperature
Range
-40 to 80°C
Marking ID
Packing Type
Tape & Reel
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
3
BCD Semiconductor Manufacturing Limited
Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
Absolute Maximum Ratings (Note 1)
Parameter
Supply Input Voltage
Enable Input Voltage
Switch Output Voltage (Note 2)
Power Dissipation (On PCB, T
A
=25°C)
Thermal Resistance (Junction to Ambient,
Simulation)
Thermal Resistance (Junction to Case,
Simulation)
Operating Junction Temperature
Operating Temperature
Storage Temperature
ESD (Human Body Model)
ESD (Machine Model)
AUR9705
Symbol
V
IN
V
EN
V
LX
P
D
θ
JA
θ
JC
T
J
T
OP
T
STG
V
HBM
V
MM
Value
0 to 6.0
-0.3 to V
IN
+0.3
-0.3 to V
IN
+0.3
1.89
53
0.85
160
-40 to 85
-55 to 150
2000
200
Unit
V
V
V
W
°C/W
°C/W
°C
°C
°C
V
V
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
LX
should be -4.5V
to 7.5V.
Recommended Operating Conditions
Parameter
Supply Input Voltage
Junction Temperature Range
Ambient Temperature Range
Symbol
V
IN
T
J
T
A
Min
2.5
-20
-40
Max
5.5
125
80
Unit
V
°C
°C
Sep. 2013
Rev. 1. 2
4
BCD Semiconductor Manufacturing Limited
Data Sheet
1.5MHz, 1A, STEP DOWN DC-DC CONVERTER
Electrical Characteristics
AUR9705
V
IN
=V
EN
=5V, V
FB
=0.6V, L=2.2μH, C
IN
= 4.7μF, C
OUT
=10μF, T
A
=25°C, unless otherwise specified.
Parameter
Input Voltage Range
Shutdown Current
Regulated1Feedback
Voltage
Regulated
Output
Voltage Accuracy
Peak
Inductor
Current
Oscillator Frequency
PMOSFET R
ON
NMOSFET R
ON
Quiescent Current
Symbol
V
IN
I
OFF
V
FB
ΔV
OUT
/V
OUT
I
PK
f
OSC
R
ON(P)
R
ON(N)
I
Q
Conditions
V
EN
=0V
For Adjustable Output Voltage
V
IN
=2.5V to 5.5V,
I
OUT
=0 to 1A
V
FB
=0.5V
Min Typ Max Unit
2.5
0.1
0.585
-3
1.5
1.2
1.5
0.25
0.27
100
5.5
1
0.615
3
V
μA
V
%
A
0.6
1.8
MHz
Ω
Ω
μA
I
OUT
=200mA
I
OUT
=200mA
I
OUT
=0A, V
FB
=0.7V
V
EN
=0V, V
LX
=0V or 5V
LX Leakage Current
Feedback Current
EN Leakage Current
EN High-level Input
Voltage
EN Low-level Input
Voltage
Under Voltage Lock
Out
Hysteresis
Thermal Shutdown
I
LX
I
FB
I
EN
V
EN_H
V
EN_L
V
UVLO
0.01
0.1
30
μA
nA
μA
V
0.01
V
IN
=2.5V to 5.5V
V
IN
=2.5V to 5.5V
Rising
1.8
0.1
1.5
0.1
0.6
V
V
V
°C
T
SD
160
Sep. 2013
Rev. 1. 2
5
BCD Semiconductor Manufacturing Limited
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