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Epson SCI 7654 Series Technical Manual

Dc/dc converter & voltage regulator.
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   Summary of Contents for Epson SCI 7654 Series

  • Page 2: Block Diagram

    0B ....SCI7661M pladtic SSOP2-16 pin BB ....BLOCK DIAGRAM OSC1 Oscilator OSC2 Reference Temperature voltge gradient generator selector Voltage CAP1– multiplier CAP1+ POFF CAP2– Voltage regulator Voltage CAP2+ multiplier Multiplication Stabilization stage stage EPSON 2–1 SCI7000 Series Technical Manual...

  • Page 3: Pin Configuration

    Voltage regulator output Voltage regulator output adjust POFF Voltage regulator output ON/OFF control OSC2 Resistor connection. Open when using external clock OSC1 Resistor connection. Clock input when using external clock Positive supply (system V EPSON 2–2 SCI7000 Series Technical Manual...

  • Page 4: Specifications

    –1.2V and –2.2V) is shown in the following figure. Note that diode D1 should have a maximum forward voltage of 0.6V with 1.0mA forward current. 2. R min can be varied depending on the input voltage. EPSON 2–3 SCI7000 Series Technical Manual...

  • Page 5: Electrical Characteristics

    = , R = 1M = , R = 1M , Stabilization current Iopr2 – 12.0 = –15V Quiescent current TC2 = TC1 = V – – = 1M Clock frequency 16.0 20.0 24.0 EPSON 2–4 SCI7000 Series Technical Manual...

  • Page 6

    –0.3 See note. %/˚C Temperature gradient –0.7 –0.6 –0.5 POFF, TC1, TC2, OSC1, and RV – – input leakage current Note (50 C)| – |V (0 C)| (25 C)| 50 C – 0 C EPSON 2–5 SCI7000 Series Technical Manual...

  • Page 7

    Ta = 25 C = –5.0V = 40kHz –5 2 multiplier 20kHz –10 = 10kHz 3 multiplier –15 –7 –6 –5 –4 –3 –2 –1 [mA] Multiplier current vs. Input voltage Output voltage vs. Output current EPSON 2–6 SCI7000 Series Technical Manual...

  • Page 8

    Peff = –5.0V 2 multiplier Peff 3 multiplier 3 multiplier 3 multiplier Peff 3 multiplier Peff 2 multiplier 2 multiplier [mA] [mA] Multiplication efficiency/input current vs. Multiplication efficiency/input current vs. Output current Output current EPSON 2–7 SCI7000 Series Technical Manual...

  • Page 9

    = 10mA 3 multiplier = 20mA 2 multiplier = 30mA Ta = 25 C = –5.0V –7 –6 –5 –4 –3 –2 –1 1000 [kHz] Output impedance vs. Input voltage Multiplication efficiency vs. Clock frequency EPSON 2–8 SCI7000 Series Technical Manual...

  • Page 10

    = –9V Ta = 25 C Ta = 25 C –5.900 –2.900 –5.950 –2.950 –3.000 –6.000 0.0001 0.0010 0.0100 0.1000 0.0001 0.0010 0.0100 0.1000 Output voltage vs. Output current Output voltage vs. Output current EPSON 2–9 SCI7000 Series Technical Manual...

  • Page 11

    (high impedance) Multiplier HIGH HIGH – (high impedance) operational Notes 1. The definition of LOW for POFF differs from that for TC1 and TC2. 2. The temperature gradient affects the voltage between V and V EPSON 2–10 SCI7000 Series Technical Manual...

  • Page 12: Functional Description

    = 0 V = 100 k to 1 M = –5 V (–5V) – = 2V = –10 V CAP2 Tripled voltage potential levels = 0 V = –5 V = 3V = –15 V EPSON 2–11 SCI7000 Series Technical Manual...

  • Page 13: Typical Applications

    Only the single output smoothing capacitor, C3, is re- = 0 V 10 F 10 F 100 k 10 F 10 F 10 F = –10 V = –15 V = –5 V 10 F EPSON 2–12 SCI7000 Series Technical Manual...

  • Page 14

    • For a voltage tripler, = 10 – (3 0.6) = 8.2V = 8.2 V • For a voltage doubler, 10 F = 5 – (2 0.6) = 3.8V = –5 V EPSON 2–13 SCI7000 Series Technical Manual...

  • Page 15

    10 F 10 F 10 F ROSC 10 F = –15 V 10 F = 8.2 V 10 F = –5 V Potential levels = 8.2V = 0 V = –5 V = –15 V EPSON 2–14 SCI7000 Series Technical Manual...

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Sci 7661 series

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