AOZ3015AI

AOZ3015AI EZBuck™ 3 A Synchronous Buck Regulator Not Recommended For New Designs General Description Features The AOZ3015AI is a high efficiency, easy to use, 3 A synchronous buck regulator. The AOZ3015AI 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 AOZ3015AI comes in a SO-8 package and is rated over a -40 °C to +85 °C operating ambient temperature range.  Up to 95 % efficiency  Synchronous Buck: 65 mΩ internal high-side switch and 30 mΩ internal low-side switch (at 12 V) s  PEM (pulse energy mode) enables >80% efficiency es  Internal soft start ig n with IOUT = 10 mA (VIN = 12 V, VOUT = 5 V)  Output voltage adjustable to 0.8 V D  3 A continuous output current Replacement Parts: AOZ6663DI AOZ6683CI ew  500 kHz PWM operation  Cycle-by-cycle current limit N  Pre-bias start-up  Short-circuit protection Fo r  Thermal shutdown  SO-8 package en de d Applications  LCD TV  Set top boxes  DVD and Blu-ray players/recorders om m  Cable modems ec Typical Application  Point of load DC/DC converters CCC C1 10µF VIN ot R VIN N EN VCC AOZ3015AI LX VOUT L1 R1 COMP FB RC AGND PGND C2, C3 22µF R2 CC Figure 1. 3 A Synchronous Buck Regulator, Fs = 500 kHz Rev. 1.1 June 2013 www.aosmd.com Page 1 of 14 AOZ3015AI Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ3015AI -40 °C to +85 °C 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. EN VIN 2 7 LX AGND 3 6 COMP VCC 4 5 FB Fo r (Top View) N SO-8 es 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 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. LX Switching node. LX is the drain of the internal power FETs. 8 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. N ot 7 Rev. 1.1 June 2013 www.aosmd.com Page 2 of 14 AOZ3015AI Block Diagram VCC UVLO & POR EN VIN LDO Regulator OTP + ISen Iinfo Softstart – s Reference & Bias Q1 ig n ILimit FB – – PWM Control Logic PWM Comp Level Shifter + FET Driver D EAmp LX Q2 ew + N 500kHz Oscillator Over-Voltage Protection Comparator Fo r COMP es + + + 0.96V d Iinfo om m Iinfo de PWM/PEM Master Control PEM Control Logic en Vref – 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. R ec Absolute Maximum Ratings Parameter ot Supply Voltage (VIN) N LX to AGND LX to AGND (