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EP5358HUI Datasheet(PDF) 11 Page - Enpirion, Inc. |
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EP5358HUI Datasheet(HTML) 11 Page - Enpirion, Inc. |
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11 / 14 page  03541 5/29/2009 Rev:A EP5358LUI/EP5358HUI ©Enpirion 2009 all rights reserved, E&OE 11 www.enpirion.com Application Information VIN VSENSE PVIN VS1 VS2 VS0 10 μF 0603 2.2 μF 0603 VOUT VOUT AGND ENABLE PGND AVIN Figure 6: Application Circuit, EP5358HUI,. VIN VSENSE PVIN VS1 VS2 VS0 10 μF 0603 2.2 μF 0603 VOUT VOUT AGND ENABLE VFB PGND AVIN Figure 7: Application Circuit, EP5358LUI, showing the VFB function. Output Voltage Programming The EP5358xUI utilizes a 3-pin VID to program the output voltage value. The VID is available in two sets of output VID programming ranges. The VID pins should be connected either to AVIN or to AGND to avoid noise coupling into the device. The “Low” range is optimized for low voltage applications. It comes with preset VID settings ranging from 0.80V and 1.5V. This VID set also has an external divider option. To specify this VID range, order part number EP5358LUI. The “High” VID set provides output voltage settings ranging from 1.8V to 3.3V. This version does not have an external divider option. To specify this VID range, order part number EP5358HUI. Internally, the output of the VID multiplexer sets the value for the voltage reference DAC, which in turn is connected to the non-inverting input of the error amplifier. This allows the use of a single feedback divider with constant loop gain and optimum compensation, independent of the output voltage selected. NOTE: The VID pins must not be left floating. EP5358L Low VID Range Programming The EP5358LUI is designed to provide a high degree of flexibility in powering applications that require low VOUT settings and dynamic voltage scaling (DVS). The device employs a 3-pin VID architecture that allows the user to choose one of seven (7) preset output voltage settings, or the user can select an external voltage divider option. The VID pin settings can be changed on the fly to implement glitch- free voltage scaling. Table 1: EP5358LUI VID Voltage Select Settings VS2 VS1 VS0 VOUT 00 0 1.50 00 1 1.45 01 0 1.20 01 1 1.15 10 0 1.10 10 1 1.05 11 0 0.8 11 1 EXT Table 1 shows the VS2-VS0 pin logic states for the EP5358LUI and the associated output voltage levels. A logic “1” indicates a connection to AVIN or to a “high” logic voltage level. A logic “0” indicates a connection to AGND or to a “low” logic voltage level. These pins can be either hardwired to AVIN or AGND or alternatively can be driven by standard logic levels. Logic levels are defined in the electrical characteristics table. Any level between the logic high and logic low is indeterminate. EP5358LUI External Voltage Divider The external divider option is chosen by connecting VID pins VS2-VS0 to VIN or a logic “1” or “high”. The EP5358LUI uses a separate feedback pin, VFB, when using the external divider. VSENSE must be connected to VOUT as indicated in Figure 8. The output voltage is selected by the following formula: |
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