Diodes AUR9717 User Manual
Dual 1A, 1.5MHz PWM Step-down DC-DC Converter with OVP AUR9717
Data Sheet
General Description
The AUR9717 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), 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 AUR9717 is available in WDFN-3×3-10
package.
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 Switchers 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 Instruments
• Post DC-DC Voltage Regulation
• PDA and Notebook Computer
WDFN-3×3-10
Figure 1. Package Type of AUR9717
Oct. 2011 Rev. 1.0 BCD Semiconductor Manufacturing Limited
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Data Sheet
Dual 1A, 1.5MHz PWM Step-down DC-DC Converter with OVP AUR9717
Pin Configuration
D Package
(WDFN-3×3-10)
Pin 1 Mark
1
EN1
2
FB1
3
VIN2
4
GND
56
LX2
10
LX1
9
GND
8
VIN1
7
FB2
EN2
Figure 2. Pin Configuration of AUR9717 (Top View)
Pin Description
Pin Number Pin Name Function
1 EN1 Enable signal input of channel 1, active high
2 FB1
3 VIN2
4, 9 GND
Feedback voltage of channel 1
Power supply input of channel 2
This pin is the GND reference for the NMOSFET power stage. It
must be connected to the system ground
5 LX2 Connection from power MOSFET of channel 2 to inductor
6 EN2 Enable signal input of channel 2, active high
7 FB2
8 VIN1
Feedback voltage of channel 2
Power supply input of channel 1
10 LX1 Connection from power MOSFET of channel 1 to inductor
Oct. 2011 Rev. 1.0 BCD Semiconductor Manufacturing Limited
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Data Sheet
Dual 1A, 1.5MHz PWM Step-down DC-DC Converter with OVP AUR9717
Functional Block Diagram
Figure 3. Functional Block Diagram of AUR9717
Ordering Information
AUR9717 A
Circuit Type
A: Adjustable Output
Package
WDFN-3×3-10 -40 to 80°C AUR9717AGD 9717A Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G" in the part number, are RoHS compliant and
green.
Temperature
Range
Part Number Marking ID Packing Type
Package
D: WDFN-3×3-10
G: Green
Oct. 2011 Rev. 1.0 BCD Semiconductor Manufacturing Limited
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Data Sheet
Dual 1A, 1.5MHz PWM Step-down DC-DC Converter with OVP AUR9717
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Supply Input Voltage V
Enable Input Voltage V
Switch Output Voltage V
V
IN1-VIN2
Voltage (Note 2) VDF
IN1, VIN2
EN1, VEN2
LX1, VLX2
Power Dissipation (On PCB, TA=25°C) PD
Thermal Resistance (Junction to Ambient, Simulation) θJA
Thermal Resistance (Junction to Case, Simulation) θJC
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: The absolute voltage difference between V
IN1
and V
can not exceed 0.3V.
IN2
STG
HBM
0 to 6.5
-0.3 to
V
IN1(VIN2
)+0.3
-0.3 to
V
IN1(VIN2
)+0.3
-0.3 to 0.3
2.22
45.13
6.97
160
-40 to 85
-55 to 150
2000
200
V
V
V
V
W
°C/W
°C/W
°C
°C
°C
V
V
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Supply Input Voltage V
IN1, VIN2
Junction Temperature Range TJ -20 125 °C
Ambient Temperature Range TA -40 80 °C
2.5 5.5 V
Oct. 2011 Rev. 1.0 BCD Semiconductor Manufacturing Limited
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Data Sheet
Dual 1A, 1.5MHz PWM Step-down DC-DC Converter with OVP AUR9717
Electrical Characteristics
VIN=V
EN1=VEN2
unless otherwise specified.
Parameter Symbol Conditions Min Typ Max Unit
=5V, V
FB1=VFB2
=0.6V, L1=L2=2.2μH, C
IN1=CIN2
=4.7μF, C
OUT1=COUT2
=10μF, TA=25°C,
Input Voltage Range VIN V
Shutdown Current I
Regulated Feedback
Voltage
Regulated Output
Voltage Accuracy
ΔV
ΔV
Peak Inductor
Current
Oscillator Frequency f
PMOSFET RON R
NMOSFET RON R
V
OFF
For Adjustable Output Voltage 0.585 0.6 0.615 V
V
FB
OUT1/VOUT1,
OUT2/VOUT2
V
I
PK
1.2 1.5 1.8 MHz
OSC
I
ON(P)
I
ON(N)
LX Leakage Current ILX
Feedback Current I
Input Over Voltage
Protection
EN Leakage Current I
EN High-level Input
Voltage
EN Low-level Input
Voltage
V
EN_H1, VEN_H2
V
EN_L1, VEN_L2
Under Voltage Lock
Out
FB1, IFB2
EN1, IEN2
V
30 nA
6 V
V
IOVP
0.01 0.1 μA
Rising 1.8 V
UVLO
IN=VIN1=VIN2
EN1=VEN2
=2.5V to 5.5V,
V
IN
I
OUT1=IOUT2
FB1=VFB2
OUT1=IOUT2
OUT1=IOUT2
V
EN1=VEN2
V
LX1=VLX2
VIN=2.5V to 5.5V 1.5 V
VIN=2.5V to 5.5V 0.6 V
2.5 5.5 V
=0V 0.1 1 μA
=0 to 1A
-3 3 %
=0.5V 1.5 A
=200mA 0.28 Ω
=200mA 0.25 Ω
=0V,
=0V or 5V
0.01 0.1 μA
Hysteresis Hysteresis 0.1 V
Thermal Shutdown TSD 160 °C
Oct. 2011 Rev. 1.0 BCD Semiconductor Manufacturing Limited
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