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EN5339QI-E Datasheet(PDF) 11 Page - Enpirion, Inc. |
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EN5339QI-E Datasheet(HTML) 11 Page - Enpirion, Inc. |
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11 / 19 page  06903 September 12, 2012 Rev: B EN5339QI © Enpirion 2012 all rights reserved, E&OE www.enpirion.com, Page 11 Functional Block Diagram Figure 4: Functional Block Diagram Functional Description Overview The EN5339QI is a highly integrated synchronous buck converter with an internal inductor utilizing advanced CMOS technology to provide high switching frequency, while also maintaining high efficiency. The EN5339QI is a high power density device packaged in a tiny 4x6x1.1mm 24-pin QFN package. Its high switching frequency allows for the use of very small MLCC input and output filter capacitors and results in a total solution size as small as 55mm 2. The EN5339QI buck converter uses Type III voltage mode control to provide pin-point output voltage accuracy, high noise immunity, low output impedance and excellent load transient response. The EN5339QI features include Power OK, under voltage lockout (UVLO), over current protection, short circuit protection, and thermal overload protection. Stability and Compensation The EN5339QI utilizes an internal compensation network that is designed to provide stable operation over a wide range of operating conditions. The output compensation circuit may be customized to improve transient performance or reduce output voltage ripple with dynamic loads. Soft-Start The EN5339QI has an internal soft-start circuit that controls the ramp of the output voltage. The control circuitry limits the VOUT ramp rate to levels that are safe for the Power MOSFETs and the integrated inductor. The EN5339QI has a constant startup up time which is independent of the VOUT setting. The output rising slew rate is proportional to the output voltage. The startup time is approximately 1.4ms from when the ENABLE is first pulled high until VOUT reaches the regulated voltage level. |
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