AOZ1051PI
Rev. 1.0 June 2011 www.aosmd.com Page 2 of 14
Ordering Information
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.
Pin Configuration
Pin Description
Part Number Ambient Temperature Range Package Environmental
AOZ1051PI -40 °C to +85 °C EPAD SO-8 Green Product
1
2
3
4
PGND
VIN
GND
FB
Exposed Pad SO-8
(Top View)
PAD
(LX)
NC
SS
EN
COMP
8
7
6
5
Pin Number Pin Name Pin Function
1 PGND Power ground. PGND needs to be electrically connected to AGND.
2 VIN Supply voltage input. When VIN rises above the UVLO threshold and EN is logic high,
the device starts up.
3 AGND Analog ground. AGND is the reference point for controller section. AGND needs to be
electrically connected to PGND.
4 FB Feedback input. The FB pin is used to set the output voltage via a resistive voltage divider
between the output and AGND.
5 COMP External loop compensation pin. Connect a RC network between COMP and AGND to
compensate the control loop.
6 EN Enable pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the
device. If on/off control in not needed, connect EN to VIN and do not leave it open.
7 SS Soft-start pin. 5 μA current charging current.
8 NC No Connect Pin. Pin 8 is not internally connected. Connect this pin externally to LX and
use it for better thermal performance.
Exposed pad LX Switching node. LX is the drain of the internal PFET. LX is used as the thermal pad of the
power stage.
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