EZBuck™ 5A Simple Buck Regulator
AOZ1094
General Description
The AOZ1094 is a high efficiency, simple to use, 5A buck
regulator. The AOZ1094 works from a 4.5V to 16V input
voltage range, and provides up to 5A of continuous
output current with an output voltage adjustable down
to 0.8V.
The AOZ1094 comes in SO-8 and DFN-8 packages
and is rated over a -40°C to +85°C ambient temperature
range.
Features
●
●
4.5V to 16V operating input voltage range
28m
Ω
internal PFET switch for high efficiency:
up to 95%
Internal soft start
Output voltage adjustable to 0.8V
Built-in Overvoltage Protection (OVP)
–
18% OVP threshold
5A continuous output current
Fixed 500kHz PWM operation
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Small size SO-8 and DFN-8 packages
●
●
●
●
●
●
●
●
●
Applications
●
●
●
●
●
●
●
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
VIN
Enable
U1
L1 3.3μH
EN
COMP
AOZ1094
LX
R1
C2
22μF
Rs
20Ω
D1
Cs
1nF
R2
VOUT
3.3V
RC
CC
C5
1000pF
FB
AGND
GND
C3
22μF
Figure 1. 3.3V/5A Buck Down Regulator
Rev. 1.3 October 2010
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Page 1 of 19
AOZ1094
Ordering Information
Part Number
AOZ1094AIL
AOZ1094DIL
Ambient Temperature Range
-40°C to +85°C
-40°C to +85°C
Package
SO-8
DFN-8
Environmental
Green Product
Green Product
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit
www.aosmd.com/web/quality/rohs_compliant.jsp
for additional information.
Pin Configuration
VIN
PGND
AGND
FB
1
2
3
4
8
7
6
5
LX
VIN
LX
EN
COMP
PGND
AGND
FB
1
8
LX
LX
EN
COMP
LX
2
3
7
6
AGND
4
5
SO-8
(Top View)
4x5 DFN
(Top View)
Pin Description
Pin Number
1
2
3
4
5
Pin Name
V
IN
PGND
AGND
FB
COMP
Pin Function
Supply voltage input. When V
IN
rises above the UVLO threshold the device starts up.
Power ground. Electrically needs to be connected to AGND.
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.
Rev. 1.3 October 2010
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Page 2 of 19
AOZ1094
Pin Number
6
7, 8
Pin Name
EN
LX
Pin Function
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
LX
COMP
Frequency
Foldback
Comparator
500kHz/38kHz
Oscillator
+
0.2V
–
0.96V
+
–
Overvoltage
Protection
Comparator
AGND
PGND
Absolute Maximum Ratings
Exceeding the Absolute Maximum ratings may damage the
device.
1. Devices are inherently ESD sensitive, handling precautions are required.
Human body model rating: 1.5k
Ω
in series with 100pF.
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
Note:
Rev. 1.3 October 2010
Rating
18V
-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
Recommended Operating Conditions
The device is not guaranteed to operate beyond the Maximum
Recommended Operating Conditions.
Parameter
Supply Voltage (V
IN
)
Output Voltage Range
Package Thermal Resistance (Θ
JA
)
(2
)
SO-8
DFN-8
Note:
Rating
4.5V to 16V
0.8V to V
IN
-40°C to +85°C
82°C/W
50°C/W
Ambient Temperature (T
A
)
Rating
(1)
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
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Page 3 of 19
AOZ1094
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
(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, 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
0.816
mA
µA
V
%
%
0.784
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
6
T
J
Rising
T
J
Falling
Off Threshold
On Threshold
145
100
960
940
3
V
IN
= 12V
V
IN
= 5V
28
48
400
100
Off Threshold
On Threshold
2.0
100
500
200
0.6
nA
V
mV
MODULATOR
600
6
kHz
%
%
V/V
µA / V
8
A
°C
V
ms
35
65
PROTECTION
I
LIM
Current Limit
Over-Temperature Shutdown Limit
V
PR
t
SS
Output Over-voltage Protection Thresh-
old
Soft Start Interval
High-Side Switch On-Resistance
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. 1.3 October 2010
www.aosmd.com
Page 4 of 19
AOZ1094
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
Full Load (CCM) Operation
Vin
ripple
200mV/div
Vout
ripple
20mV/div
IL
2A/div
Vin
ripple
100mV/div
Vout
ripple
20mV/div
IL
2A/div
VLX
10V/div
VLX
10V/div
2s/div
2s/div
Full Load to Startup
Light Load to Startup
Vin
5V/div
Vin
5V/div
Vout
2V/div
Vout
2V/div
lin
2A/div
lin
200mA/div
2ms/div
2ms/div
50% to 100% Load Transient
Vout ripple
200mV/div
lout
2A/div
200s/div
Rev. 1.3 October 2010
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Page 5 of 19
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