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AOZ1210AI

P1-P3P4-P6P7-P9P10-P12P13-P14
Rev. 1.7 December 2009 www.aosmd.com Page 1 of 14
AOZ1210
EZBuck™ 2A Simple Buck Regulator
General Description
The AOZ1210 is a high efficiency, simple to use, 2A buck
regulator flexible enough to be optimized for a variety of
applications. The AOZ1210 works from a 4.5V to 27V
input voltage range, and provides up to 2A of continuous
output current on each buck regulator output. The output
voltage is adjustable down to 0.8V.
Features
● 4.5V to 27V operating input voltage range
● 70mΩ internal NFET, efficiency: up to 95%
● Internal soft start
● Output voltage adjustable down to 0.8V
● 2A continuous output current
● Fixed 370kHz PWM operation
● Cycle-by-cycle current limit
● Short-circuit protection
● Thermal shutdown
● Small size SO-8 packages
Applications
● Point of load DC/DC conversion
● Set top boxes
● DVD drives and HDD
● LCD Monitors & TVs
● Cable modems
● Telecom/Networking/Datacom equipment
Typical Application
Figure 1. 3.3V/2A Buck Regulator
LX
VIN BS
VIN
VOUT
FB
GND
EN
VBIAS
COMP
C1
22µF
C7
C4
C4, C6
22µF
R1
R2
R
C
C
C
L1
6.8µH
AOZ1210
AOZ1210
Rev. 1.7 December 2009 www.aosmd.com Page 2 of 14
Ordering Information
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
Pin Description
Part Number Ambient Temperature Range Package Environmental
AOZ1210AI -40°C to +85°C SO-8 RoHS
VBIAS
VIN
EN
COMP
1
2
3
4
LX
BST
GND
FB
SO-8
(Top View)
8
7
6
5
Pin Number Pin Name Pin Function
1 LX PWM output connection to inductor. LX pin needs to be connected externally. Thermal connection
for output stage.
2 BST Bootstrap voltage input. High side driver supply. Connected to 0.1µF capacitor between BST and
LX.
3 GND Ground.
4 FB Feedback input. It is regulated to 0.8V. The FB pin is used to determine the PWM output voltage
via a resistor divider between the output and GND.
5 COMP External loop compensation. Output of internal error amplifier. Connect a series RC network to
GND for control loop compensation.
6 EN Enable pin. The enable pin is active HIGH. Connect EN pin to V
IN
if not used. Do not leave the EN
pin floating.
7V
IN
Supply voltage input. Range from 4.5V to 27V. When V
IN
rises above the UVLO threshold the
device starts up. All V
IN
pins need to be connected externally.
8 VBIAS Compensation pin of internal linear regulator. Place put a 1µF capacitor between this pin and
ground.
AOZ1210
Rev. 1.7 December 2009 www.aosmd.com Page 3 of 14
Block Diagram
Absolute Maximum Ratings
Exceeding the Absolute Maximum Ratings may damage the device.
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5k
Ω in series with 100pF.
Recommend Operating Ratings
The device is not guaranteed to operate beyond the Maximum
Operating Ratings.
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 spe-
cific board design.
370kHz/24kHz
Oscillator
GND
VIN
EN
VBIAS
FB
COMP
LX
BST
OTP
ILimit
PWM
Control
Logic
5V LDO
Regulator
UVLO
& POR
+5V
GM = 200µA/V
Softstart
Reference
& Bias
0.8V
Q1
Q2
PWM
Comp
ISen
EAmp
0.2V
+
–
+
–
+
–
+
–
+
Frequency
Foldback
Comparator
Parameter Rating
Supply Voltage (V
IN
) 30V
LX to GND -0.7V to V
IN
+0.3V
EN to GND -0.3V to V
IN
+0.3V
FB to GND -0.3V to 6V
COMP to GND -0.3V to 6V
BST to GND V
LX
+6V
VBIAS to GND -0.3V to 6V
Junction Temperature (T
J
) +150°C
Storage Temperature (T
S
) -65°C to +150°C
ESD Rating: Human Body Model
(1)
2kV
Parameter Rating
Supply Voltage (V
IN
) 4.5V to 27V
Output Voltage Range 0.8V to 0.85*V
IN
Ambient Temperature (T
A
) -40°C to +85°C
Package Thermal Resistance SO-8
(Θ
JA
)
(2
)
105°C/W
P1-P3P4-P6P7-P9P10-P12P13-P14

AOZ1210AI

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IC REG BUCK ADJUSTABLE 2A 8SOIC
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