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BD3537F Datasheet(PDF) 5 Page - Rohm |
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BD3537F Datasheet(HTML) 5 Page - Rohm |
5 / 11 page 5/10 ● BLOCK DIAGRAM ● PIN CONFIGRATION ● PIN FUNCTION PIN No. PIN name PIN Function 1 VTT_IN Termination power supply pin 2 GND Ground pin 3 REF Reference voltage output pin 4 VTT Termination output pin 5 N.C. Non connection 6 VCC VCC Pin 7 N.C. Non connection 8 N.C. Non connection ● Description of operations ・ VCC In BD3537F, an independent power input pin is provided for an internal circuit operation of the IC. This is used to drive the amplifier circuit of the IC, and its maximum current rating is 2.5mA. The power supply voltage is 5.0 volts. It is recommended to connect a bypass capacitor of 1μF or so to VCC. ・ VTT_IN VTT_IN is a power supply input pin for VTT output. Voltage in the range up to 1.8 volts may be supplied to this VTT_IN terminal, but care must be taken to the current limitation due to on-resistance of the IC and the change in allowable loss due to input/output voltage difference. Higher impedance of the voltage input at VTT_IN may result in oscillation or degradation in ripple rejection, which must be noted. To VTT_IN terminal, it is recommended to use a 10μF capacitor characterized with less change in capacitance. But it may depend on the characteristics of the power supply input and the impedance of the pc board wiring, which must be carefully checked before use. ・ VTT A DDR memory termination output pin. BD3537F has a sink/source current capability of ±1.8A respectively. The output voltage is same as REF voltage. VTT output is turned to OFF when VCC UVLO or thermal shutdown protector is activated with EN pin level becomes EN-OFF voltage or below. Do not fail to connect a capacitor to VTT output pin for a loop gain phase compensation and a reduction in output voltage variation in the event of sudden change in load. Insufficient capacitance may cause an oscillation. High ESR (Equivalent Series Resistance) of the capacitor may result in increase in output voltage variation in the event of sudden change in load. It is recommended to use a 10 μF ceramic capacitor (X5R or X7R), though it depends on ambient temperature and other conditions. A low ESR ceramic capacitor may reduce a loop gain phase margin and may cause an oscillation, which may be improved by connecting a resistor in series with the OS-capacitor (several-hundred μF). ・ REF With an input of 0.6 volts or higher, the level at REF pin turns to “High” to provide VTT output. If the input is lowered to 0.15 volts or less, the level at REF pin turns to “Low” and VTT status turns to Hi-Z. VCC VCC VDDQ VTT Reference Block GND VTT VTT_IN TSD EN UVLO UVLO TSD VCC VCC TSD EN UVLO - + - + + - C3 REF VTT_IN C2 C1 Enable Block EN C4 R1 R2 Thermal Protection N.C VTT_IN GND REF N.C. VCC 1 2 3 6 7 8 VTT N.C. 4 5 |
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Similar Description - BD3537F_08 |
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