AOZ3015PI EZBuck 3 A Synchronous Buck Regulator General Description Features The AOZ3015PI is a high efficiency, easy to use, 3 A 4.5 V to 18 V operating input voltage range synchronous buck regulator. The AOZ3015PI works from Synchronous Buck: 85 m internal high-side switch 4.5 V to 18 V input voltage range, and provides up to 3 A and 50 m internal low-side switch (at 12 V) of continuous output current with an output voltage PEM (pulse energy mode) enables >85% efficiency adjustable down to 0.8 V. with I = 10 mA (V = 12 V, V = 5 V) OUT IN OUT The AOZ3015PI comes in an exposed pad SO-8 350 A supply current under typical application package and is rated over a -40 C to +85 C operating Up to 95 % efficiency ambient temperature range. Internal soft-start Output voltage adjustable to 0.8 V 3 A continuous output current 500 kHz PWM operation Cycle-by-cycle current limit Pre-bias start-up Short-circuit protection Thermal shutdown Exposed pad SO-8 package Applications Point of load DC/DC converters LCD TV Set top boxes DVD and Blu-ray players/recorders Cable modems Typical Application Efficiency (V = 12V) vs. Load Current VIN IN 100 C C1 CC 10F VIN VCC 90 VOUT EN VOUT AOZ3015PI LX 80 L1 R1 COMP C2, C3 5V OUTPUT 70 FB 22F 3.3V OUTPUT R C 2.5V OUTPUT AGND PGND 1.8V OUTPUT R2 60 C C 50 0.01 0.1 1 10 Load Current (A) Figure 1. 3 A Synchronous Buck Regulator, Fs = 500 kHz Rev. 2.0 July 2013 www.aosmd.com Page 1 of 13 Efficiency (%)AOZ3015PI Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ3015PI -40 C to +85 C EPAD SO-8 Green Product AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information. Pin Configuration 1 8 PGND VOUT 2 7 VIN EN PAD (LX) 3 6 AGND COMP 4 5 VCC FB Exposed Pad SO-8 (Top View) Pin Description 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 VCC Internal LDO output. 5 FB Feedback input. The FB pin is used to set the output voltage via a resistive voltage divider between the output and AGND. 6 COMP External loop compensation pin. Connect a RC network between COMP and AGND to compensate the control loop. 7 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. 8 VOUT VOUT sense pin for protection purposes. Exposed pad LX Switching node. LX is the drain of the internal power FETs. LX is used as the thermal pad of the power stage. Rev. 2.0 July 2013 www.aosmd.com Page 2 of 13