SCI7654C0A

PF754-03 SCI7654M0A/C0A DC/DC Converter Double/Triple/Quadruple Boosting 95% Excellent Power Conversion Efficiency Built-in Voltage Regulator DESCRIPTION The SCI7654 is a highly efficient, but low power-consumption DC-to-DC converter based on the advanced CMOS technologies. It can generate an output voltage double/triple/quadruple times higher than the input (in negative direction) if 4/3/2 external capacitors are attached. With a built-in voltage regulator, the SCI7654 can provide a stable output by setting the DC/DC output to any voltage via two external resistors. This is optimum to the LCD panel power supply as the stable output can have the negative temperature gradient required for an LCD panel. FEATURES An input voltage can be boosted double/triple/quadruple to negative potential. Input voltages: –2.4 to –5.5V (quadruple boosting), –2.4 to –7.3V (triple boosting), –2.4 to –11.0V (double boosting) Excellent vol tage conversion efficiency: 95% (Typ.) Large output current: 20 mA (Max.) during quadruple boosting Built-in voltage regulator (for stable voltage output) Built-in reference voltage source for accurate regulation: –1.5 ± 0.05V (CT0) Regulator output voltage temperature gradient function: –0.04, –0.15, –0.35, –0.55%/˚C Low current consumption: 130 µA (Typ.) Low standby current: 5.0 µA (Max.) Built-in oscillator circuit 5/6-time voltage boosting in negative potential by serial connection Package: SCI7654M0A SSOP2-16pin (plastic), SCI7654C0A DIP-16pin (plastic) BLOCK DIAGRAM VDD POFF1 POFF2 Power-Off Control Ref. Voltage Circuit TC1 TC2 FC Clock Generator Booster Control Voltage Regulator RV VREG VRI VIN Voltage Converter VOUT C1P C1N C3N C2P C2N SCI7654M0A/C0A PIN CONFIGURATION SSOP2-16pin/DIP-16pin VOUT VRI VREG RV VDD FC TC1 TC2 1 2 3 4 5 6 7 8 16 C2P 15 C2N 14 C3N 13 C1N 12 C1P 11 VIN 10 POFF1 9 POFF2 PIN DESCRIPTION Pin No. 1 2 3 4 5 6 Pin Name VOUT VRI VREG RV VDD FC Voltage output Regulator input Regulator output Input for regulator output voltage adjustment Input voltage pin (Positive) Internal clock rate switch input, and clock input in serial/parallel connection (Common input pin) 7 8 9 10 11 12 13 14 15 16 TC1 TC2 POFF2 POFF1 VIN C1P C1N C3N C2N C2P Input for regulator output temperature gradient setup (1) Input for regulator output temperature gradient setup (2) Power-off control input (2) Power-off control input (1) Input voltage pin (Negative) Common double and quadruple boosting capacitor positive pin Double boosting capacitor negative pin Quadruple boosting capacitor negative pin Triple boosting capacitor negative pin Triple boosting capacitor positive pin Function 2 SCI7654M0A/C0A ABSOLUTE MAXIMUM RATINGS Rating Input Power Voltage Input Pin Voltage Output Pin Voltage 1 Output Pin Voltage 2 Output Pin Voltage 3 Output Pin Voltage 4 Regulator Input Power Voltage Regulator Input Pin Voltage Output Voltage Input Current Output Current Allowable Loss Operating Temperature Storage Temperature Soldering Temperature and Time Symbol VIN VI V0C1 VOC2 VOC3 VOC4 VRI VRV V0 IIN IOUT Pd Topr Tstg Tsol 2 3 4 N N N Min. -26.0/N VIN -0.3 VIN -0.3 VIN -0.3 VIN -0.3 VIN -0.3 VIN -0.3 VIN -0.3 VIN -0.3 — — — -30 -55 — Max. VDD +0.3 VDD +0.3 VDD +0.3 VIN +0.3 2 VIN +0.3 3 VIN +0.3 VDD +0.3 VDD +0.3 VDD +0.3 80 N≤4: 20 N>4: 80/N 210 85 150 260•10 Unit V V V V V V V V V mA mA mW ˚C ˚C ˚C . S Remark N=Boosting time; at VIN pin POFF1, POFF2 TC1, TC2, FC pins At C1P and C2P pins At C1N pin At C2N pin At C3N pin N=Boosting time; at VRI pin N=Boosting time; at RV pin N=Boosting time; at VOUT and VREG pins At VIN pin N=Boosting time; at VOUT and VREG pins — — — Temperature at leads ELECTRICAL CHARACTERISTICS (Unless otherwise designated: Ta=–30°V to +85°C, VDD=0V, VIN=–5.0V) Characteristic Input Power Voltage 1 Input Power Voltage 2 Input Power Voltage 3 Input Power Voltage N Boost Startup Input Power Voltage Booster Output Voltage Regulator Input Voltage Regulator Output Voltage Booster Output Impedance Booster Power Conversion Efficiency Booster Operating Current Consumption 1 Booster Operating Current Consumption 2 Regulator Operating Current Consumption Symbol VIN1 VIN2 VIN3 VINN VSTA VOUT VRI VREG ROUT Peff Condition During quadruple boosting During triple boosting During double boosting During large-time boosting using external diodes N=Boosting time, IOUT