General Description The AOZ1010 is a high efciency simple to use 2A buck regulator The AOZ1010 works from a 45V to 16V input voltage range and provides up to 2A of continuous output current with an output voltage adjustable down to 08V The AOZ1010 comes in an SO8 package and is rated over a 40C to 85C ambient temperature range AOZ1010 EZBuck 2A Simple Regulator Features internal PFET switch for high efciency 45V ......
AOZ1010
EZBuck™ 2A Simple Regulator
General Description
The AOZ1010 is a high efficiency, simple to use, 2A buck
regulator. The AOZ1010 works from a 4.5V to 16V input
voltage range, and provides up to 2A of continuous
output current with an output voltage adjustable down to
0.8V.
The AOZ1010 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
2A continuous output current
Fixed 500kHz PWM operation
Cycle-by-cycle current limit
Short-circuit 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
Cd
C1
22µF Ceramic
VIN
L1
3.3µH
EN
VOUT
AOZ1010
COMP
RC
CC
LX
R1
FB
C2, C3
22µF Ceramic
R2
AGND
PGND
Figure 1. 3.3V/2A Buck Regulator
Rev. 1.0 November 2006
www.aosmd.com
Page 1 of 14
AOZ1010
Ordering Information
Part Number
AOZ1010AI
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
wwww.aosmd.com/web/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.
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
D1
LX
LX
COMP
500kHz
Oscillator
AGND
PGND
Rev. 1.0 November 2006
www.aosmd.com
Page 2 of 14
11
2
µ
AOZ1010
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
)
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
Parameter
Supply Voltage (V
IN
)
Output Voltage Range
Ambient Temperature (T
A
)
Package Thermal Resistance SO-8
(
Θ
JA
)
(1
)
Rating
4.5V to 16V
0.8V to V
IN
-40°C to +85°C
87°C/W
Note:
1.
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.
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
(2
)
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, VFB = 1.2V, V
EN
> 1.2V
V
EN
= 0V
Min.
4.5
Typ.
4.00
3.70
2
3
Max.
16
Units
V
V
3
20
0.818
mA
µA
V
%
%
0.782
0.8
0.5
1
I
FB
V
EN
V
HYS
f
O
D
MAX
D
MIN
Feedback Voltage Input Current
EN Input Threshold
EN Input Hysteresis
Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Error Amplifier Voltage Gain
Error Amplifier Transconductance
500
200
2.5
T
J
Rising
T
J
Falling
145
100
4
V
IN
= 12V
V
IN
= 5V
97
166
350
100
Off Threshold
On Threshold
2.0
100
500
200
0.6
nA
V
mV
MODULATOR
600
6
kHz
%
%
V/ V
µA / V
3.6
A
°C
ms
130
200
PROTECTION
I
LIM
Current Limit
Over-Temperature Shutdown Limit
t
SS
Soft Start Interval
High-Side Switch On-Resistance
OUTPUT STAGE
m
Ω
Note:
2.
Specification in
BOLD
indicate an ambient temperature range of -40°C to +85°C. These specifications are guaranteed by design.
Rev. 1.0 November 2006
www.aosmd.com
Page 3 of 14
AOZ1010
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
5V/div
Full Load to Turnoff
Vo
1V/div
Vin
5V/div
Iin
0.5A/div
Vo
1V/div
Iin
0.5A/div
1ms/div
1ms/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. 1.0 November 2006
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Page 4 of 14
AOZ1010
Typical Performance Characteristics
(Continued)
Circuit of Figure 1. T
A
= 25°C, V
IN
= V
EN
= 12V, V
OUT
= 3.3V unless otherwise specified.
Short Circuit Protection
Short Circuit Recovery
Vo
2V/div
Vo
2V/div
IL
1A/div
IL
1A/div
100µs/div
1ms/div
AOZ1010AI Efficiency
Efficiency (V
IN
= 12V) vs. Load Current
100
8.0V OUTPUT
95
Efficieny (%)
90
5.0V OUTPUT
3.3V OUTPUT
85
80
75
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Load Current (A)
Thermal de-rating curves for SO-8 package part under typical input and output condition based on the evaluation board.
25°C ambient temperature and natural convection (air speed < 50LFM) unless otherwise specified.
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