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BD3532EFV Datasheet(PDF) 11 Page - Rohm |
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BD3532EFV Datasheet(HTML) 11 Page - Rohm |
11 / 17 page 11/16 ・ VTT A DDR memory termination output pin. BD3533/31/32 has a sink/source current capability of ±1.0A/±1.5A/±3.0A respectively. The output voltage tracks the voltage divided in half at VDDQ pin. VTT output is turned to OFF when VCC UVLO or thermal shutdown protector is activated with EN pin level turned to “Low”. 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 220 μF functional polymer capacitor (OS-CON, POS-CAP, NEO-CAP), 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 capacitor. ・ EN With an input of 2.3 volts or higher, the level at EN pin turns to “High” to provide VTT output. If the input is lowered to 0.8 volts or less, the level at EN pin turns to “Low” and VTT status turns to Hi-Z. But if VCC and VDDQ are established, VREF output is maintained. ● Evaluation Board Part No Value Company Parts Name Part No Value Company Parts Name U1 - ROHM BD3533F C4 - - - R1 - - - C5 10uF KYOCERA CM21B106M06A R4 220Ω ROHM MCR032200 C6 - - - J1 0Ω - - C7 - - - J2 0Ω - - C8 - - - C1 - - - C9 2.2uF KYOCERA CM105B225K06A C2 10uF KYOCERA CM21B106M06A C10 220uF SANYO 2R5TPE220MF C3 1uF KYOCERA CM105B105K06A ■ ■ BD3533F Evaluation Board Application Components Versions for MSOP8 and HQFN20V packages are also available. In addition, BD3533F/FVM/EKN(1A), BD3531F(1.5A), and BD3532F/EFV/KN(3A) are available . Silk Screen TOP Layer Bottom Layer ■ ■ BD3533F Evaluation Board Circuit C5,C6 GND BD3533F VREF EN VCC VDDQ VTT_IN VTTS VTT GND VCC SW1 J2 R4 C9 J1 C3,C4 C7 C8 C10 C2 C1 R1 2 7 5 6 1 8 3 4 U1 VTT_IN VCC VTT VREF VDDQ EN VTTS GND ■ ■ BD3533F(SOP8) Evaluation Board Layout |
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