AOZ1020AI-EVB Datasheet, PDF (1/4 Pages) Alpha & Omega Semiconductors – EZBuck™ 2A Synchronous Buck Regulator Evaluation Board Note

AOZ1020AI-EVB
EZBuck™ 2A Synchronous Buck Regulator
Evaluation Board Note
General Description
The AOZ1020AI evaluation board is a fully assembled
and tested circuit board built with the AOZ1020AI buck
regulator IC. It outputs an adjustable voltage up to 2A of
continuous current. The evaluation board requires an
input voltage from 4.5 to 16V. The output voltage is preset
at 3.3V and can be adjusted down to 0.8V.
The AOZ1020AI-EVB circuit has features like current
limit, short circuit protection, input under voltage lock out,
internal soft start and thermal shut down. It operates at a
fixed 500kHz switching frequency. The integrated
internal MOSFETs minimize component count, board
area and total cost.
The AOZ1020AI-EVB demonstrates the simple buck
converter design. Only one resistor value change is
needed for different output voltage designs. The
AOZ1020AI-EVB also supports single layer board
design.
Features
● 4.5V to 16V operating input voltage range
● Output voltage preset to 3.3V, adjustable to as low as
0.8V
● 2A continuous output current
● Fixed 500kHz PWM operation
● Internal soft start
● Open-drain Power Good output
● Cycle-by-cycle current limit
● Short-circuit protection
● Thermal shutdown
● Enables single layer board design
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
Evaluation Board Schematic
PG5V
GND GND
R4
EN
EN
R3
0
Vin
Vin
Rg
10k
GND
C6
Cp
open
Cc
Rc
102
20k
U1 5
3 _AGND
6 _EN
C4
104
2 _VIN
C1
1
226
GND
GND
PG
GND
8
R2
10k
FB ⁴
C5
open
R1
31.6k
L
LX ^{7 1}
2
4R7
C2
226
VO
C3
226
GND
Rev. 1.1 July 2009
www.aosmd.com
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