AOZ1018 Datasheet, PDF (2/14 Pages) Alpha & Omega Semiconductors – EZBuck™ 2A Simple Regulator

AOZ1018
Ordering Information
Part Number
Ambient Temperature Range
Package
Environmental
AOZ1018AI
-40°C to +85°C
SO-8
RoHS
All AOS Products are offered in packaging with Pb-free plating and compliant to RoHS standards. Please visit
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Pin Configuration
NC 1
VIN 2
AGND 3
FB 4
SO-8
(Top View)
8 PGND
7 LX
6 EN
5 COMP
Pin Description
Pin Number Pin Name
1
NC
2
VIN
3
AGND
4
FB
5
COMP
6
EN
7
LX
8
PGND
Pin Function
Not connected.
Supply voltage input. When VIN rises above the UVLO threshold the device starts up.
Reference connection for controller section. Also used as thermal connection for controller
section. Electrically needs to be connected to PGND.
The FB pin is used to determine the output voltage via a resistor divider between the output and
GND.
External loop compensation pin.
The enable pin is active high. Connect EN pin to VIN if not used. Do not leave the EN pin floating.
PWM output connection to inductor. Thermal connection for output stage.
Power ground. Electrically needs to be connected to AGND.
Block Diagram
VIN
EN
UVLO
5V LDO
Internal
OTP
& POR
Regulator
+5V
Reference
& Bias
Softstart
ILimit
+
ISen
–
Q1
+
0.8V
FB
+
EAmp
–
– ^PWM
Comp
+
PWM
Control
Logic
Level
Shifter
+
FET
LX
Driver
COMP
Rev. 1.0 November 2006
500kHz
Oscillator
AGND
www.aosmd.com
PGND
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