AOZ1015
EZBuck™ 1.5A Synchronous Buck Regulator
General Description
The AOZ1015 is a high efficiency, simple to use, 1.5A
buck regulator. The AOZ1015 works from a 4.5V to
16V input voltage range, and provides up to 1.5A of
continuous output current with an output voltage
adjustable down to 0.8V.
The AOZ1015 comes in an SO-8 package and is rated
over a -40°C to +85°C ambient temperature range.
Features
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4.5V to 16V operating input voltage range
130m
Ω
internal PFET switch for high efficiency:
up to 95%
Internal Schottky diode
Internal soft start
Output voltage adjustable to 0.8V
1.5A continuous output current
Fixed 500kHz PWM operation
Cycle-by-cycle current limit
Short-circuit protection
Under voltage lockout
Output over voltage protection
Thermal shutdown
Small size SO-8 package
Applications
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Point of load DC/DC conversion
PCIe graphics cards
Set top boxes
DVD drives and HDD
LCD panels
Cable modems
Telecom/networking/datacom equipment
Typical Application
VIN
C1
22µF Ceramic
L1
4.7µH
VIN
From µPC
EN
COMP
R1
C5
C2
AOZ1015
VOUT
LX
R2
FB
C4, C6
22µF x 2
Ceramic
R3
AGND
PGND
Figure 1. 3.3V/1.5A Buck Regulator
Rev. 1.2 September 2007
www.aosmd.com
Page 1 of 15
AOZ1015
Ordering Information
Part Number
AOZ1015AI
HS nt
Ro mplia
Co
Ambient Temperature Range
-40°C to +85°C
Package
SO-8
Environmental
RoHS
All AOS Products are offering in packaging with Pb-free plating and compliant to RoHS standards.
Please visit
www.aosmd.com/web/quality/rohs_compliant.jsp
for additional information.
Pin Configuration
PGND
VIN
AGND
FB
1
2
3
4
8
7
6
5
LX
LX
EN
COMP
SO-8
(Top View)
Pin Description
Pin Number
1
2
3
4
5
6
7, 8
Pin Name
PGND
V
IN
AGND
FB
COMP
EN
LX
Pin Function
Power ground. Electrically needs to be connected to AGND.
Supply voltage input. When V
IN
rises above the UVLO threshold the device starts up.
Reference connection for controller section. Also used as thermal connection for controller
section. Electrically needs to be connected to PGND.
The FB pin is used to determine the output voltage via a resistor divider between the output
and GND.
External loop compensation pin.
The enable pin is active HIGH. Connect EN pin to V
IN
if not used. Do not leave the EN pin
floating.
PWM output connection to inductor. Thermal connection for output stage.
Rev. 1.2 September 2007
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Page 2 of 15
AOZ1015
Block Diagram
VIN
EN
UVLO
& POR
5V LDO
Regulator
Internal
+5V
OTP
+
ISen
Reference
& Bias
–
Softstart
ILimit
Q1
+
0.8V
+
EAmp
FB
–
PWM
–
Comp
+
PWM
Control
Logic
Level
Shifter
+
FET
Driver
LX
COMP
+
0.2V
–
Frequency
Foldback
Comparator
500kHz/63kHz
Oscillator
0.96V
+
–
Over Voltage
Protection
Comparator
AGND
PGND
Absolute Maximum Ratings
Exceeding the Absolute Maximum ratings may damage the
device.
Recommend Operating Ratings
The device is not guaranteed to operate beyond the Maximum
Operating Ratings.
Parameter
Supply Voltage (V
IN
)
LX to AGND
EN to AGND
FB to AGND
COMP to AGND
PGND to AGND
Junction Temperature (T
J
)
Storage Temperature (T
S
)
ESD Rating
(1)
Human Body Model
Machine Model
18V
Rating
-0.7V to V
IN
+0.3V
-0.3V to V
IN
+0.3V
-0.3V to 6V
-0.3V to 6V
-0.3V to +0.3V
+150°C
-65°C to +150°C
2kV
200V
Parameter
Supply Voltage (V
IN
)
Output Voltage Range
Ambient Temperature (T
A
)
Package Thermal Resistance SO-8
(
Θ
JA
)
(2
)
Rating
4.5V to 16V
0.8V to V
IN
-40°C to +85°C
87°C/W
Note:
2. The value of
Θ
JA
is measured with the device mounted on 1-in
2
FR-4
board with 2oz. Copper, in a still air environment with T
A
= 25°C. The
value in any given application depends on the user’s specific board
design.
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5k
Ω
in series with 100pF.
The machine model is a 200pF capacitor discharged directly into
each pin.
Rev. 1.2 September 2007
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Page 3 of 15
AOZ1015
Electrical Characteristics
Symbol
V
IN
V
UVLO
I
IN
I
OFF
V
FB
T
A
= 25°C, V
IN
= V
EN
= 12V, V
OUT
= 3.3V unless otherwise specified.
(3
)
Parameter
Supply Voltage
Input Under-Voltage Lockout Threshold
Supply Current (Quiescent)
Shutdown Supply Current
Feedback Voltage
Load Regulation
Line Regulation
Conditions
V
IN
Rising
V
IN
Falling
I
OUT
= 0, V
FB
= 1.2V, V
EN
> 1.2V
V
EN
= 0V
Min.
4.5
Typ.
4.00
3.70
2
1
Max.
16
Units
V
V
3
10
0.818
mA
µA
V
%
%
0.782
0.8
0.5
0.5
I
FB
ENABLE
V
EN
V
HYS
I
EN
f
O
D
MAX
D
MIN
Feedback Voltage Input Current
EN Input Threshold
EN Input Hysteresis
EN Input Current
Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Error Amplifier Voltage Gain
Error Amplifier Transconductance
500
200
2
Off threshold
On threshold
920
820
960
860
150
2.2
V
IN
= 12V
V
IN
= 5V
97
166
400
100
500
Off Threshold
On Threshold
200
0.6
2.0
100
1
600
6
nA
V
mV
µA
kHz
%
%
V/ V
µA / V
MODULATOR
PROTECTION
I
LIM
V
PR
T
J
t
SS
Current Limit
Output Over-Voltage Protection
Threshold
Over-Temperature Shutdown Limit
Soft Start Interval
High-Side Switch On-Resistance
3.6
1000
900
A
mV
°C
ms
130
200
OUTPUT STAGE
m
Ω
Note:
3. Specification in
BOLD
indicate an ambient temperature range of -40°C to +85°C. These specifications are guaranteed by design.
Rev. 1.2 September 2007
www.aosmd.com
Page 4 of 15
AOZ1015
Typical Performance Characteristics
Circuit of Figure 1. T
A
= 25°C, V
IN
= V
EN
= 12V, V
OUT
= 3.3V unless otherwise specified.
Light Load (DCM) Operation
Vin
ripple
0.1V/div
Full Load (CCM) Operation
Vin
ripple
0.1V/div
Vo
ripple
20mV/div
Vo
ripple
20mV/div
IL
1A/div
VLX
10V/div
IL
1A/div
VLX
10V/div
1µs/div
1µs/div
Startup to Full Load
Vin
10V/div
Full Load to Turnoff
Vin
10V/div
Vo
1V/div
Iin
0.5A/div
Vo
1V/div
Iin
0.5A/div
400µs/div
400µs/div
50% to 100% Load Transient
Light Load to Turnoff
Vo
Ripple
50mV/div
Vin
5V/div
Vo
1V/div
Io
1A/div
Iin
0.5A/div
100µs/div
1s/div
Rev. 1.2 September 2007
www.aosmd.com
Page 5 of 15
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