AOZ1052PI Datasheet PDF - Alpha & Omega Semiconductors


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AOZ1052PI
Alpha & Omega Semiconductors

Part Number AOZ1052PI
Description 4A Synchronous Buck Regulator
Page 14 Pages

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AOZ1052PI
EZBuck™ 4A Synchronous Buck Regulator
General Description
The AOZ1052PI is a high efficiency, easy to use, 4A
synchronous buck regulator. The AOZ1052PI works from
4.5V to 18V input voltage range, and provides up to 4A of
continuous output current with an output voltage
adjustable down to 0.8V.
The AOZ1052PI comes in an exposed pad SO-8
package and is rated over a -40°C to +85°C operating
ambient temperature range.
Features
4.5V to 18V operating input voltage range
Synchronous Buck: 60minternal high-side switch
and 20minternal low-side switch (at 12V)
Up to 95% efficiency
External soft start
Output voltage adjustable to 0.8V
4A continuous output current
450kHz PWM operation
Cycle-by-cycle current limit
Pre-bias start-up
Short-circuit protection
Thermal shutdown
Exposed pad SO-8 package
Applications
Point of load DC/DC converters
LCD TV
Set top boxes
DVD and Blu-ray players/recorders
Cable modems
Typical Application
VIN
C1
10µF
RC
CC
CSS
VIN SS
EN
AOZ1052PI LX
COMP
FB
AGND
PGND
L1 4.7µH
R1
R2
VOUT
C2, C3
22µF
Rev. 0.5 September 2012
Figure 1. 3.3V, 4A Synchronous Buck Regulator, Fs = 450kHz
www.aosmd.com
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Ordering Information
Part Number
AOZ1052PI
Ambient Temperature Range
-40 °C to +85 °C
Package
EPAD SO-8
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.
Pin Configuration
PGND 1
VIN 2
AGND 3
FB 4
PAD
(LX)
8 NC
7 SS
6 EN
5 COMP
Exposed Pad SO-8
(Top View)
AOZ1052PI
Environmental
Green Product
Pin Description
Pin Number
1
2
Pin Name
PGND
VIN
3 AGND
4 FB
5 COMP
6 EN
7 SS
8 NC
Exposed pad
LX
Pin Function
Power Ground. PGND needs to be electrically connected to AGND.
Supply Voltage Input. When VIN rises above the UVLO threshold and EN is logic high,
the device starts up.
Analog Ground. AGND is the reference point for controller section. AGND needs to be
electrically connected to PGND.
Feedback Input. The FB pin is used to set the output voltage via a resistive voltage divider
between the output and AGND.
External Loop Compensation Pin. Connect a RC network between COMP and AGND to
compensate the control loop.
Enable Pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the
device. If on/off control in not needed, connect EN to VIN and do not leave it open.
Soft-Start Pin. 5µA current charging current.
No Connect Pin. Pin 8 is not internally connected. Connect this pin externally to LX and
use it for better thermal performance.
Switching Node. LX is the drain of the internal PFET. LX is used as the thermal pad of the
power stage.
Rev. 0.5 September 2012
www.aosmd.com
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Block Diagram
AOZ1052PI
VIN
EN
UVLO
5V LDO
Internal
OTP
& POR
Regulator
+5V
Reference
& Bias
Softstart
SS
0.8V
FB
SS
5µA
+
EAmp
COMP
+
PWM
Comp
+
ILimit
PWM
Control
Logic
500kHz
Oscillator
+
ISen
Level
Shifter
+
FET
Driver
Q1
Q2
LX
AGND
PGND
Absolute Maximum Ratings
Exceeding the Absolute Maximum Ratings may damage the
device.
Parameter
Supply Voltage (VIN)
LX to AGND
LX to AGND (20ns)
EN to AGND
FB, SS, COMP to AGND
PGND to AGND
Junction Temperature (TJ)
Storage Temperature (TS)
ESD Rating(1)
Rating
20V
-0.7V to VIN+0.3V
-5V to 22V
-0.3V to VIN+0.3V
-0.3V to 6.0V
-0.3V to +0.3V
+150°C
-65°C to +150°C
2.0kV
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5kin series with 100pF.
Recommended Operating Conditions
The device is not guaranteed to operate beyond the Maximum
Recommended Operating Conditions.
Parameter
Rating
Supply Voltage (VIN)
Output Voltage Range
Ambient Temperature (TA)
Package Thermal Resistance
Exposed Pad SO-8 (JA)
Power Dissipation
Exposed Pad SO-8 (JA)
4.5V to 18V
0.8V to 0.85*VIN
-40°C to +85°C
50°C/W
2.5W
Rev. 0.5 September 2012
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Electrical Characteristics
TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified(2)
Symbol
Parameter
Conditions
VIN
VUVLO
IIN
IOFF
VFB
Supply Voltage
Input Under-Voltage Lockout
Threshold
Supply Current (Quiescent)
Shutdown Supply Current
Feedback Voltage
Load Regulation
VIN Rising
VIN Falling
IOUT = 0, VFB = 1.2V, VEN > 2V
VEN = 0V
TA = 25°C
Line Regulation
IFB Feedback Voltage Input Current
VEN EN Input Threshold
Off Threshold
On Threshold
VHYS
EN Input Hysteresis
EN Leakage Current
SS Time
MODULATOR
CSS = 16nF
fO
DMAX
TMIN
Frequency
Maximum Duty Cycle
Controllable Minimum On Time
Current Sense Transconductance
Error Amplifier Transconductance
PROTECTION
ILIM Current Limit
Over-Temperature Shutdown Limit
OUTPUT STAGE
TJ Rising
TJ Falling
High-Side Switch On-Resistance
Low-Side Switch On-Resistance
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 5V
Note:
2. The device is not guaranteed to operate beyond the Maximum Operating Ratings.
AOZ1052PI
Min.
4.5
0.788
2
Typ.
4.1
3.7
1.6
1
0.8
0.5
1
200
2
Max.
18
2.5
10
0.812
200
0.6
1
Units
V
V
mA
µA
V
%
%
nA
V
mV
µA
ms
400 450 500 kHz
85 %
150 ns
8 A/V
200 µA/V
4.8 5.5
150
100
A
°C
60 m
75
20 m
30
Rev. 0.5 September 2012
www.aosmd.com
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