AOZ3015PI

AOZ3015PI EZBuck™ 3 A Synchronous Buck Regulator Not Recommended For New Designs General Description Features The AOZ3015PI is a high efficiency, easy to use, 3 A synchronous buck regulator. The AOZ3015PI works from 4.5 V to 18 V input voltage range, and provides up to 3 A of continuous output current with an output voltage adjustable down to 0.8 V.  4.5 V to 18 V operating input voltage range The AOZ3015PI comes in an exposed pad SO-8 package and is rated over a -40 °C to +85 °C operating ambient temperature range.  350 µA supply current under typical application  Synchronous Buck: 85 mΩ internal high-side switch and 50 mΩ internal low-side switch (at 12 V) s  PEM (pulse energy mode) enables >85% efficiency  Internal soft-start es  Up to 95 % efficiency ig n with IOUT = 10 mA (VIN = 12 V, VOUT = 5 V) D  Output voltage adjustable to 0.8 V Replacement Parts: AOZ6663DI AOZ6683CI ew  3 A continuous output current  500 kHz PWM operation N  Cycle-by-cycle current limit  Pre-bias start-up Fo r  Short-circuit protection  Thermal shutdown d  Exposed pad SO-8 package de Applications  Point of load DC/DC converters en  LCD TV  Set top boxes om m  DVD and Blu-ray players/recorders ec  Cable modems VIN ot C1 10µF N VIN EN Efficiency (VIN = 12V) vs. Load Current 100 CCC VCC 90 VOUT AOZ3015PI LX VOUT L1 R1 COMP FB RC AGND PGND C2, C3 22µF Efficiency (%) R Typical Application 80 5V OUTPUT 3.3V OUTPUT 2.5V OUTPUT 70 R2 1.8V OUTPUT 60 CC 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 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. 2 AGND 3 VCC 4 PAD (LX) VOUT 7 EN 6 COMP 5 FB Fo r (Top View) N Exposed Pad SO-8 es VIN 8 D 1 ew PGND ig n s Pin Configuration 1 PGND 2 VIN 3 AGND 4 VCC 5 FB ec COMP R 6 Pin Function Power ground. PGND needs to be electrically connected to AGND. en Pin Name Supply voltage input. When VIN rises above the UVLO threshold and EN is logic high, the device starts up. om m Pin Number de d Pin Description EN 8 VOUT Exposed pad LX N ot 7 Rev. 2.0 July 2013 Analog ground. AGND is the reference point for controller section. AGND needs to be electrically connected to PGND. Internal LDO output. Feedback input. The FB pin is used to set the output voltage via a resistive voltage divider between the output and AGND. External loop compensation pin. Connect a RC network between COMP and AGND to compensate the control loop. 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. VOUT sense pin for protection purposes. Switching node. LX is the drain of the internal power FETs. LX is used as the thermal pad of the power stage. www.aosmd.com Page 2 of 13 AOZ3015PI Block Diagram VCC UVLO & POR EN VIN LDO Regulator OTP + ISen Softstart – Q1 ig n ILimit FB – – PWM Control Logic PWM Comp + COMP Fo r PEM Control Logic Q2 N 500kHz Oscillator Vref LX ew Output Sense VOUT Level Shifter + FET Driver D EAmp es + + s Reference & Bias Iinfo de d PWM/PEM Master Control om m en Iinfo AGND PGND Recommended Operating Conditions Exceeding the Absolute Maximum Ratings may damage the device. The device is not guaranteed to operate beyond the Maximum Recommended Operating Conditions. ec Absolute Maximum Ratings Parameter ot LX to AGND R Supply Voltage (VIN) LX to AGND (