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EN5365QI Datasheet(PDF) 11 Page - Altera Corporation |
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EN5365QI Datasheet(HTML) 11 Page - Altera Corporation |
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11 / 18 page  EN5365QI Theory of Operation Synchronous Buck Converter The EN5365QI is a synchronous, pin programmable power supply with integrated power MOSFET switches and integrated inductor. The nominal input voltage range is 2.375-5.5V. The output can be set to common pre-set voltages by connecting appropriate combinations of 3 voltage selection pins to ground. The feedback control loop is a type III voltage-mode and the part uses a low-noise PWM topology. Up to 6A of output current can be drawn from this converter. The 5MHz operating frequency enables the use of small-size output capacitors. The power supply has the following protection features: • Programmable over-current protection (to protect the IC from excessive load current) • Thermal shutdown with hysteresis. • Over-voltage protection • Under-voltage lockout circuit to disable the converter output when the input voltage is less than approximately 2.2V Additional features include: • Soft-start circuit, limiting the in-rush current when the converter is powered up. • Power good circuit indicating whether the output voltage is within 90%-120% of the programmed voltage. Output Voltage Programming The EN5365QI output voltage is programmed using a 3-pin voltage-ID or VID selector. Three binary VID pins allow the user to choose one of seven pre-set voltages. Refer to table 1 for the proper VID pin settings to program VOUT. The voltage select pins, VS0, VS1, and VS2, are pulled-up internally and so will default to a logic high, or “1”, if left “open”. Connecting the voltage select pin to ground will result in a logic “0”. For a device capable of external output voltage adjustment, refer to the EN5366QI datasheet. Table 1: Output Voltage Select Table VS2* VS1* VS0* Output Voltage 0 0 0 3.3V 0 0 1 2.5V 0 1 0 1.8V 0 1 1 1.5V 1 0 0 1.25V 1 0 1 1.2V 1 1 0 0.8V 1 1 1 Reserved Input Capacitor Selection The EN5365QI requires about 40-50uF of input capacitance. Low ESR ceramic capacitors are required with X5R or X7R dielectric formulation. Y5V or equivalent dielectric formulations must not be used as they lose capacitance with frequency, temperature and bias voltage. In some applications, lower value ceramic capacitors maybe needed in parallel with the larger capacitors in order to provide high frequency decoupling. Table 2. Recommended input capacitors. Description MFG P/N 22uF, 10V, X5R, 1206 Murata GRM31CR61A226ME19L (2 capacitors needed) Taiyo Yuden LMK316BJ226ML-T 47uF, 10V, X5R, 1210 Murata GRM32ER61A476KE20L (1 capacitor needed) Taiyo Yuden LMK325BJ476MM-T Output Capacitor Selection The EN5365QI has been optimized for use with approximately 50μF of output capacitance. Low ESR ceramic capacitors are required with X5R or X7R dielectric formulation. Y5V or equivalent dielectric formulations must not be used as these lose capacitance with frequency, temperature and bias voltage. 11 www.altera.com/enpirion 03816 October 11, 2013 Rev G |
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