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EN5337QI-T Datasheet(PDF) 7 Page - Enpirion, Inc. |
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EN5337QI-T Datasheet(HTML) 7 Page - Enpirion, Inc. |
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7 / 12 page  02638 6/18/2009 Rev:D EN5337QI ©Enpirion 2009 all rights reserved, E&OE 7 www.enpirion.com Functional Block Diagram (+) (-) Error Amp VOUT P-Drive N-Drive UVLO Thermal Limit Current Limit Soft Start PLL / Sawtooth Generator (+) (-) PWM Comp PVIN ENABLE Compensation Network Voltage Reference PGND XFB EAOUT SS Over Voltage power Good Logic POK EAOUT SYNC EN5337QI NC(SW) AGND Regulated Voltage AVIN Figure 4: Functional Block Diagram Functional Description Synchronous Buck Converter The EN5337QI is a synchronous, programmable power supply with integrated power MOSFET switches and integrated inductor. The nominal input voltage range is 2.375V to 5.5V. The output voltage is programmed using an external resistor divider network. The control loop is voltage-mode with a type III compensation network. Much of the compensation circuitry is internal to the device. However, a phase lead capacitor is required along with the output voltage feedback resistor divider to complete the type III compensation network. The device uses a low-noise PWM topology. Up to 3A of continuous output current can be drawn from this converter. The 5MHz switching frequency allows the use of small size input / output capacitors, and realizes a wide loop bandwidth within a small foot print. Protection Features: The power supply has the following protection features: • Over-current protection (to protect the IC from excessive load current) • Thermal shutdown with hysteresis. • Under-voltage lockout circuit to disable the converter output when the input voltage is less than approximately 2.2V Additional Features: • The switching frequency can be phase- locked to an external clock to eliminate or move beat frequency tones out of band. • Soft-start circuit, limiting the in-rush current when the converter is initially powered up. The soft start time is programmable with appropriate choice of soft start capacitor value. |
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