Synchronous Regulator. AOZ1267QI-01 Datasheet

AOZ1267QI-01 Datasheet PDF


Part Number

AOZ1267QI-01

Description

28V/8A Synchronous Regulator

Manufacture

Alpha & Omega Semiconductors

Total Page 16 Pages
Datasheet
Download AOZ1267QI-01 Datasheet


AOZ1267QI-01
AOZ1267QI-01
28V/8A Synchronous EZBuckTM Regulator
General Description
The AOZ1267-01 is a high-efficiency, easy-to-use DC/DC
synchronous buck regulator that operates up to 28V.
The device is capable of supplying 8A of continuous
output current with an output voltage adjustable down to
0.8V (±1.0%).
The AOZ1267-01 integrates an internal linear regulator
to generate 5.3V VCC from input. If input voltage is lower
than 5.3V, the linear regulator operates at low drop-
output mode, which allows the VCC voltage is equal to
input voltage minus the drop-output voltage of the
internal linear regulator.
A proprietary constant on-time PWM control with input
feed-forward results in ultra-fast transient response while
maintaining relatively constant switching frequency over
the entire input voltage range. The switching frequency
can be externally programmed up to 1MHz.
The device features multiple protection functions such as
VCC under-voltage lockout, cycle-by-cycle current limit,
output over-voltage protection, short-circuit protection, as
well as thermal shutdown.
The AOZ1267-01 is available in a 4mm x 4mm QFN-23L
package and is rated over a -40°C to +85°C ambient
temperature range.
Features
Wide input voltage range
2.7V to 28V
8A continuous output current
Output voltage adjustable down to 0.8V (±1.0%)
Low RDS(ON) internal NFETs
35mhigh-side
12mlow-side
Constant On-Time with input feed-forward
Programmable frequency up to 1MHz
Selectable PFM light load operation
Ceramic capacitor stable
Adjustable soft start
Power Good output
Integrated bootstrap diode
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Thermally enhanced 4mm x 4mm QFN-23L package
Applications
Portable computers
Compact desktop PCs
Servers
Graphics cards
Set-top boxes
LCD TVs
Cable modems
Point-of-load DC/DC converters
Telecom/Networking/Datacom equipment
Rev. 3.0 March 2014
www.aosmd.com
Page 1 of 16

AOZ1267QI-01
AOZ1267QI-01
Typical Application
RTON
R3
100kΩ
Power Good
C4
1μF
Off On
CSS
TON
IN
VCC
BST
AOZ1267-01
PGOOD
LX
EN
PFM
SS
FB
AGND
PGND
C5
0.1μF
L1
1μH
Input
6.5V to 28V
C2
20μF
R1
25kΩ
1%
R2
80kΩ
1%
Output
1.05V, 8A
C3
88μF
External 5V VCC Bias
RTON
5V
R3
100kΩ
Power Good
C4
1μF
Off On
CSS
TON
AIN
VCC
IN
BST
AOZ1267-01
PGOOD
LX
EN
PFM
SS
FB
AGND
PGND
C5
0.1μF
L1
1μH
Input
2.7V to 28V
C2
20μF
R1
25kΩ
1%
R2
80kΩ
1%
Output
1.05V, 8A
C3
88μF
Rev. 3.0 March 2014
www.aosmd.com
Page 2 of 16





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