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EN5310DC-E Datasheet(PDF) 6 Page - Enpirion, Inc. |
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EN5310DC-E Datasheet(HTML) 6 Page - Enpirion, Inc. |
6 / 10 page Rev 0.95 – March 2005 www.enpirion.com EN5310 6 Theory of Operation Synchronous Buck Converter The EN5310 is a synchronous, pin programmable power supply with integrated power MOSFET switches and inductor. The nominal input voltage range is 2.5-5.0V. The output can be set to common voltages by connecting appropriate combinations of 3 voltage selection pins to ground. If different voltage levels are required, provision is also made to allow external programming. The feedback control loop is voltage-mode and the part uses a low-noise PWM topology. Up to 1A of output current can be drawn from this converter. The 5MHz operating frequency enables the use of small-size output capacitors. The power supply also has protection features such as: • Programmable over-current protection (to protect the IC from excessive load current) • Thermal shutdown (to protect the converter from getting too hot) • Over-voltage protection that stops the PWM switching and turns on the lower N-MOSFET at 120% of the programmed output voltage in order to protect the load from an OV condition. • 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 EN5310 output voltage is programmed using one of two methods. Common output voltages are achieved by tying one or more of the three Voltage Select pins (VS0, VS1 & VS2) to ground (see Table 1). If all three are left floating, the output voltage and over voltage thresholds are determined by the voltages presented at the XFB and XOV pins respectively. These voltages should be set by way of resistor dividers between VOUT to GND with the midpoint going to XFB and XOV. Use an appropriate resistor ratio such that the desired output voltage across the resistor pair causes the XFB pin to be 0.8V at the nominal set-point. It is recommended that the resistor values used should be in the 20K-40K range. Contact Enpirion Applications Support for more specific information. If Over- Voltage protection is required, the output of a second divider to XOV should be set such that 0.96V is present at the desired trip point. By design, if both resistor dividers are the same, the OV trip-point will be 20% above the nominal output voltage. XFB 22µF 10µF 15 nF VOUT POK PGND AGND SS PVIN AVIN XOV V OUT V IN 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 User Selectable ** 0.8V ref only, not guaranteed performance * The VS0, VS1 and VS2 pins are defaulted to a ‘1’ with an internal pull-up resistor. Only connect these pins to AGND if a ‘0’ is required. If a ‘1’ is required, then leave the pin floating. Capacitor Selection The EN5310 needs about 10-20uF of input capacitance. Low-cost, low-ESR ceramic capacitors can be used as input capacitors for this converter and it is strongly recommended that they be rated X5R or X7R. In some applications, lower value capacitors are needed in parallel with the larger, lossy capacitors in order to provide high frequency decoupling. |
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