Data Sheet
Dual High-efficiency PWM Step-down DC-DC Converter
General Description
The AUR9706 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), Input Over Voltage
Protection (IOVP) 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 AUR9706 is available in WDFN-3×3-12
package.
AUR9706
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Dual Channel 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
Internal Input Over Voltage Protection
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-3×3-12
Figure 1. Package Type of AUR9706
Nov. 2011
Rev. 1. 0
1
BCD Semiconductor Manufacturing Limited
Data Sheet
Dual High-efficiency PWM Step-down DC-DC Converter
Pin Configuration
D Package
(WDFN-3×3-12)
AUR9706
Pin 1 Mark
1
2
3
4
5
6
12
11
Exposed
Pad
10
9
8
7
Figure 2. Pin Configuration of AUR9706 (Top View)
Pin Description
Pin Number
1
2
3, 9
4
5, 11
6
7
8
10
12
Pin Name
VIN2
LX2
GND
FB1
NC1,NC2
EN1
VIN1
LX1
FB2
EN2
Function
Power supply input of channel 2
Connection from power MOSFET of channel 2 to inductor
This pin is the GND reference for the NMOSFET power stage. It
must be connected to the system ground
Feedback voltage of channel 1
No internal connection (floating or connecting to GND)
Enable signal input of channel 1, active high
Power supply input of channel 1
Connection from power MOSFET of channel 1 to inductor
Feedback voltage of channel 2
Enable signal input of channel 2, active high
Nov. 2011
Rev. 1. 0
2
BCD Semiconductor Manufacturing Limited
Data Sheet
Dual High-efficiency PWM Step-down DC-DC Converter
Functional Block Diagram
AUR9706
EN1 , EN2
6 ,12
Saw-tooth
Generator
Oscillator
Over Current
Comparator
VIN1 , VIN2
7,1
Bias
Generator
+
Current
Sensing
4 , 10
Soft
Start
FB1 , FB2
-
+
Error
Amplifier
+
-
Modulator
Control
Logic
Buffer &
Dead Time
Control
Logic
8,2
LX1 , LX2
-
+
Reverse Inductor
Current Comparator
Thermal
Shutdown
-
+
Bandgap
Reference
Over Voltage
Comparator
3,9
GND
Figure 3. Functional Block Diagram of AUR9706
Ordering Information
AUR9706
Package
D: WDFN-3×3-12
G: Green
Circuit Type
A: Adjustable Output
Package
WDFN-3×3-12
Temperature
Range
-40 to 80°C
Part Number
AUR9706AGD
Marking ID
9706A
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G" in the part number, are RoHS compliant and
green.
Nov. 2011
Rev. 1. 0
3
BCD Semiconductor Manufacturing Limited
Data Sheet
Dual High-efficiency PWM Step-down DC-DC Converter
Absolute Maximum Ratings (Note 1)
Parameter
Supply Input Voltage
Enable Input Voltage
Switch Output Voltage
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)
AUR9706
Symbol
V
IN1,
V
IN2
V
EN1,
V
EN2
V
LX1,
V
LX2
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
IN1
(V
IN2
)+0.3
-0.3 to
V
IN1
(V
IN2
)+0.3
2.44
41
4.2
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.
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
Nov. 2011
Rev. 1. 0
4
BCD Semiconductor Manufacturing Limited
Data Sheet
Dual High-efficiency PWM Step-down DC-DC Converter
Electrical Characteristics
V
IN
=V
EN1
=V
EN2
=5V, V
FB1
=V
FB2
=0.6V, L1=L2=2.2µH, C
IN1
=C
IN2
=4.7µF, C
OUT1
=C
OUT2
=10µF, T
A
=25°C,
unless otherwise specified.
AUR9706
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
∆V
OUT
/V
OUT
I
PK
f
OSC
R
ON(P)
R
ON(N)
I
Q
Conditions
V
IN
=V
IN1
=V
IN2
V
EN1
=V
EN2
=0V
For Adjustable Output Voltage
V
IN
=2.5V to 5.5V,
I
OUT1
=I
OUT2
=0 to 1A
V
FB1
=V
FB2
=0.5V
Min Typ Max Unit
2.5
0.1
0.585
-3
1.5
1.2
1.5
0.27
0.25
100
5.5
1
0.615
3
V
µA
V
%
A
0.6
1.8
MHz
Ω
Ω
µA
I
OUT1
=I
OUT2
=200mA
I
OUT1
=I
OUT2
=200mA
I
OUT1
=I
OUT2
=0A,
V
FB1
=V
FB2
=0.7V
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
V
EN1
=V
EN2
=0V,
V
LX1
=V
LX2
=0V or 5V
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
Hysteresis
1.8
0.1
160
1.5
0.1
0.6
V
V
V
°C
T
SD
Nov. 2011
Rev. 1. 0
5
BCD Semiconductor Manufacturing Limited
stm32/stm8
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