aoz1281di Alpha & Omega Semiconductor, aoz1281di Datasheet - Page 2

• Manufacturer Part Number: aoz1281di
• Description: Ezbucktm 1.8 A Simple Buck Regulator
• Manufacturer: Alpha & Omega Semiconductor

Ordering Information
Pin Configuration
Pin Description
Pin Number
Rev. 1.0 June 2011
2, 3
6, 7
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
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1
4
5
8
Part Number
AOZ1281DI
Exposed Pad
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Pin Name
GND
BST
VIN
EN
FB
LX
Ambient Temperature Range
PWM output connection to inductor.
Supply voltage input. Range from 3 V to 26 V. When VIN rises above the UVLO threshold
the device starts up. If Vin is lower than 4.5 V, an external 5 V is needed to add through
the external diode for BST.
Enable pin. The enable pin is active high. Connect EN pin to VIN through current limiting
resistor. Do not leave the EN pin floating.
Feedback input. It is regulated to 0.8 V. The FB pin is used to determine the PWM output
voltage via a resistor divider between the output and GND.
Ground.
Bootstrap voltage input. High side driver supply. Connected to 10 nF capacitor between
BST and LX.
Thermal exposed pad. Pad can be connected to GND if necessary for improved thermal
performance.
-40 °C to +85 °C
VIN
VIN
EN
LX
1
2
3
4
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DFN 2x2, 8L
Exposed
(Top View)
Pad
for additional information.
Pin Function
DFN 2 x 2, 8L
Package
8
7
6
5
BST
GND
GND
FB
Environmental
Green Product
AOZ1281
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