Intel/Altera EN5322QI

The EN5322 is a high efficiency synchronous buck converter with integrated inductor, PWM controller, MOSFETS, and compensation providing the smallest possible solution size. The 4 MHz operation allows for the use of tiny MLCC capacitors. It also enables a very wide control loop bandwidth providing excellent transient performance and reduced output impedance. The internal compensation is designed for unconditional stability across all operating conditions. Three VID output voltage select pins provide seven pre-programmed output voltages along with an option for external resistor divider. Output voltage can be programmed on-the-fly to provide fast, dynamic voltage scaling with smooth transitions between VID programmed output voltages.

The EN5322 leverages advanced CMOS technology to provide high switching frequency, while also maintaining high efficiency. Packaged in a 4 mm x 6 mm x 1.1 mm QFN, the EN5322 provides a high degree of flexibility in circuit design while maintaining a very small footprint. High switching frequency allows for the use of very small MLCC input and output filter capacitors. The converter uses voltage mode control to provide high noise immunity, low output impedance and excellent load transient response. No external compensation components are needed for most applications. Output voltage is chosen from one of seven preset values via a three-pin VID voltage select scheme. An external divider option enables the selection of any output voltage ≥ 0.6 V. The VID pins can be toggled dynamically to implement glitch-free dynamic voltage scaling between any two VID preset values. POK monitors the output voltage and signals if it is within ±10% of nominal. Protection features include under voltage lockout (UVLO), over current protection, short circuit protection, and thermal overload protection.

The EN5322 utilizes an internal compensation network and is designed to provide stable operation over a wide range of operating conditions. To improve transient performance or reduce output voltage ripple with dynamic loads you have the option to add supplementary capacitance to the output. When programming VOUT using the VID pins, the EN5322 is stable with up to 60 μF of output capacitance without compensation adjustment. Additional output capacitance above 60 μF can be accommodated with compensation adjustment depending on the application.

• Revolutionary Integrated Inductor
• Total Solution Footprint as Small as 50 mm²
• 4 mm x 6 mm x 1.1 mm QFN Package
• 4 MHz Fixed Switching Frequency
• High Efficiency, up to 95%
• Low Ripple Voltage; 8 mVP-P Typical
• 2% Initial VOUT Accuracy with VID Codes
• 2% Initial 0.6 V Feedback Voltage Accuracy
• 2.4 V to 5.5 V Input Voltage Range
• 2 A Continuous Output Current Capability
• Fast Transient Response
• Low Dropout Operation: 100% Duty Cycle
• Power OK Signal with 5 mA Sink Capability
• Dynamic Voltage Scaling with VID Codes
• 17 μA Typical Shutdown Current
• Under Voltage Lockout, Over Current, Short Circuit, and Thermal Protection
• RoHS Compliant; MSL 3 260 °C Reflow

• Point of Load Regulation for Low Power Processors, Network Processors, DSPs, FPGAs and ASICs
• Replacement of LDOs
• Noise Sensitive Applications such as A/V and RF
• Computing, Computer Peripherals, Storage, Networking, and Instrumentation
• DSL, STB, DVR, DTV, and iPC