AOZ2235CQI-02

AOZ2235CQI-02 I2C Controllable 28V/12A Synchronous EZBuckTM Regulator General Description Features The AOZ2235CQI-02 is an I2C controllable, high efficiency, easy-to-use DC-DC synchronous buck regulator capable of operation from a 6.5V to 28V input bus. Ability to control the output voltage using the I2C bus simplifies converter design for microprocessors or SoCs that require dynamic voltage scaling or voltage margining. The device is capable of supplying 12A of continuous output current with an output voltage adjustable from 1.790625V to 0.6V (±2.0%).  Wide input voltage range The AOZ2235CQI-02 integrates an internal linear regulator to generate 5.3V VCC from input. If input voltage is lower than 5.3V, the linear regulator operates at low drop output mode, then VCC voltage is equal to input voltage minus the drop-output voltage of the internal linear regulator. – 6.5V to 28V  12A continuous output current  Output voltage adjustable from 0.6V to 1.790625V in 9.375mV  ±2.0% output voltage accuracy for I2C control  Low RDS(ON) internal NFETs – 11m high-side – 7m low-side  Constant On-Time with input feed-forward  Selectable PFM Light-Load Operation  Ceramic capacitor stable  Power Good output A proprietary constant on-time PWM control with input feed-forward results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input voltage range.  I2C address programming The device features multiple protection functions such as VCC under-voltage lockout, cycle-by-cycle current limit, output over-voltage protection, short-circuit protection, and thermal shutdown.  Over voltage protection The AOZ2235CQI-02 is available in a 4mm×4mm QFN22L package and is rated over a -40°C to +85°C ambient temperature range.  Integrated bootstrap diode  Cycle-by-cycle current limit  Short-circuit protection  Thermal shutdown  Thermally enhanced 4mm x 4mm QFN-22L package Applications  Portable computers  Compact desktop PCs  Servers  Graphics cards  Set-top boxes  LCD TVs  Cable modems  Point-of-load DC/DC converters  Telecom/Networking/Datacom equipment Rev 1.2 April 2018 www.aosmd.com Page 1 of 23 AOZ2235CQI-02 Typical Application 3.3V R1 1.0k R2 Off On 1.0k EN SCL SCL SDA SDA 0 6Ch 1 6Eh µ Processor POWER GOOD 5.3V Analog Ground Power Ground AD0 INPUT 6.5V to 28V IN C1 20µF VOUT BST LX AOZ2235CQI-02 C4 0.1µF VOUT 0.6V to 1.790625V C2 132µF L1 1.0µH PGOOD R3 10k VCC C3 4.7µF VOI PGND AGND R4 R5 Option Table Item Code AD0 Address (Binary) Address (Hex) Ground (0) 01101000 68h Open (1) 01101010 6Ah Ground (0) 01101100 6Ch Open (1) 01101110 6Eh AOZ2235CQI-01 AOZ2235CQI-02 Recommended Start-up Sequence VIN EN 50µs Rev 1.2 April 2018 www.aosmd.com Page 2 of 23 AOZ2235CQI-02 Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ2235CQI-02 -40°C to +85°C 22-Pin 4mm x 4mm QFN 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 LX 20 19 18 21 EN VCC 22 BST PGOOD AD0 1 17 LX SCL 2 16 LX SDA 3 15 PGND VOI 4 14 PGND VOUT 5 13 PGND AGND 6 12 PGND 8 9 10 11 IN LX LX LX IN IN 7 IN 22-Pin 4mm x 4mm QFN Rev 1.2 April 2018 www.aosmd.com Page 3 of 23 AOZ2235CQI-02 Pin Description Pin Number Pin Name Pin Function 1 AD0 Chip Address. The AD0 pin just connects to AOZ2235CQI-02 VCC pin or GND. 2 SCL Clock I/O Terminal. 3 SDA Data I/O Terminal. 4 VOI Initial Output Voltage Feedback Input. Adjust the output voltage with a resistive voltagedivider between VCC and AGND. 5 VOUT Output Voltage Feedback Input. Connection to output voltage. 6 AGND Analog Ground. 7, 8, 9 IN Supply Input. IN is the regulator input. All IN pins must be connected together. 10, 11, 16, 17, 18 LX Switching Node. 12, 13, 14, 15 PGND Power Ground. 19 EN Enable Input. The AOZ2235CQI-02 is enabled when EN is pulled high. The device shuts down when EN is pulled low. 20 BST Bootstrap Capacitor Connection. The AOZ2235CQI-02 includes an internal bootstrap diode. Connect an external capacitor between BST and LX as shown in Typical Application diagram. 21 VCC Supply Input for Analog Functions. Bypass VCC to AGND with a 1µF~4.7µF ceramic capacitor, based on different PCB layout and application conditions. Place the capacitor close to VCC pin. PGOOD Power Good Signal Output. PGOOD is an open-drain output used to indicate the status of the output voltage. It is internally pulled low when the output voltage is 15% lower than the nominal regulation voltage or 20% higher than the nominal regulation voltage. PGOOD is pulled low during soft-start and shut down. 22 Rev 1.2 April 2018 www.aosmd.com Page 4 of 23 AOZ2235CQI-02 Absolute Maximum Ratings Maximum Operating Ratings Exceeding the Absolute Maximum Ratings may damage the device. The device is not guaranteed to operate beyond the Maximum Operating ratings. Parameter Rating IN to AGND Parameter Rating -0.3V to 30V Supply Voltage (VIN) LX to AGND -0.3V to 30V Output Voltage Range BST to AGND -0.3V to 36V Ambient Temperature (TA) (1) PGOOD, EN, VCC, SCL, SDA, VOUT, VOI, AD0 to AGND -0.3V to +0.3V Junction Temperature (TJ) +150°C Storage Temperature (TS) -65°C to +150°C ESD Rating(2) 0.6 V to 1.790625V -40°C to +85°C Package Thermal Resistance (JA) (JC) -0.3V to 6V PGND to AGND 6.5V to 28V 32°C/W 4°C/W 2kV Notes: 1. LX to PGND Transient (t