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SCI7661MOA
SCI7661C/MSeries CMOS DC/DC CONVERTER s DESCRIPTION The SCI7661C/M CMOS DC/DC Converter features high operational performance with low power dissipation. It consists of two major parts: the booster circuitry and the regulator circuitry. The booster generates a doubled output voltage (–2.4V to –12V) or tripled output voltage (–3.6V to –18V) from the input (–1.2V to –6V). The regulator is capable of setting the output to any desired voltage. The regulated voltage can be given one of three threshold temperature gradients. s FEATURES dissipation • High performance with low power |V | (+5V), 2 |V | (+10V), 2 V (–10V) or 3 V (–15V) (–5V) to • Simple conversion of V regulator On–chip output voltage • Power conversion efficiency .......................................................... Typ 95% • Temperature gradient for LCD power supply ................................ 0.1%/°C, 0.4%/°C or 0.6%/°C • Power off by external signals — Stationary current at power off ... Max 2µA • Cascade connection — two devices connected ............................. V =–5V, V =–20V • On–chip C–R oscillator • Package ......................................................................................... SCI7661C DIP–14pin (plastic) • SOP5–14pin (plastic) SCI7661M IN IN IN IN IN IN OUT OA .. OA .. s BLOCK DIAGRAM s PIN CONFIGURATION 14 VDD OSC1 2 13 OSC1 CAP2+ 3 12 OSC2 CAP2– 4 11 Poff TC1 5 10 RV TC2 6 9 Vreg VIN 7 8 VOUT OSC2 CR Oscillator VIN CAP1– CAP1+ Voltage Converter (I) CAP2– CAP2+ Temperature Gradient Select Circuit 1 CAP1– Voltage Regualtor CAP1+ Reference Voltage Generator VDD TC1 TC2 Poff RV Voltage Converter (II) Vreg VOUT Booster Regulator 873 The same pin configuration in DIP and SOP
EPSON
セイコーエプソン株式会社
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