SCI7661

PF110-10 SCI7661COA/MOA e ag olt n V w tio Lo pera cts O rodu P DC-DC Converter q 95% Typical Power Efficiency q Doubled or Tripled Output Voltage q Internal Voltage Regulator s DESCRIPTION The SCI7661COA/MOACMOS 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 (–2.4 to –12V) or tripled output voltage (–3.6 to –18V) from the input (–1.2 to –6V). The regulator is capable of setting the output to any desired voltage. The regulated voltage can be given one of the three threshold temperature gradients. s FEATURES q High performance with low power dissipation q Simple conversion of VIN (–5V) to |VIN| (+5V), 2 |VIN| (+10V), 2VIN (–10V) or 3VIN (–15V) q On-chip output voltage regulator q Power conversion efficiency–Typ. 95% q Temperature gradient for LCD power supply – 0.1% / °C, 0.4%/°C or 0.6%/ °C q Power off by external signals – Stationary current at power off – Max. 2 µA q Cascade connection–two device connected: VIN=–5V, VOUT=–20V q On-chip C'–R oscillator q Package .................................... SCI7661C0A: DIP-14pin (plastic) SCI7661M0A: SOP5-14pin (plastic) SCI7661MAA: SSOP2-16pin (plastic) s BLOCK DIAGRAM VDD CR Oscillator Temperature Gradient Select Circuit OSC1 OSC2 VIN CAP1– CAP1+ CAP2– CAP2+ Reference Voltage Generator Voltage Regulator TC1 TC2 T Voltage Converter (I) Voltage Converter (II) Poff RV Vreg Vout Booster Regurator SCI7661COA/MOA s PIN CONFIGURATION CAP1+ CAP1CAP2+ CAP2TC1 TC2 VIN 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VDD OSC1 OSC2 Poff RV Vreg Vout s PIN DESCRIPTION Pin name CAP1+, CAP1CAP2+, CAP2TC1, TC2 VIN VOUT Vreg RV Poff OSC2, OSC1 VDD Terminal for connection of capacitor for doubler Terminal for connection of capacitor for tripler Temperature gradient selection terminal Power supply terminal(negative, system supply GND) 8 Output terminal at tripling 9 Regulated voltage output terminal 10 Regulated voltage control terminal 11 Vreg output ON/OFF control terminal 12, 13 Oscillation resistor connection terminal 14 Power supply terminal(positive system supply VCC) No. 1, 2 3, 4 5, 6 7 Function The same pin configuration in DIP and SOP s ABSOLUTE MAXIMUM RATINGS Rating Input supply voltage Input terminal voltage Output voltage Allowable loss Operating temperature Storage temperature Soldering temperature and time Symbol VI VI VO Pd Topr Tstg Tsol -30 -55 Min. -20/N VIN-0.5 VOUT-0.5 -20.0 Max. 0.5 0.5 0.5 300 85 150 Unit V V V V mW °C °C - (VDD=0V) Remark N=2 : Doubler N=3 : Tripler OSC1, Poff TC1, TC2, RV Plastic package 260°C, 10s(at lead) Note: When this IC is soldered in the solder-reflow process, be sure to maintain the reflow furnace at the curve shown in "Fig. 1-5 Reflow Furnace Temperature Curve" of this DATA BOOK. And this IC can not be exposed to high temperature of the solder dipping. s ELECTRICAL CHARACTERISTICS Characteristic Input supply voltage Output voltage Vreg Regulator operating voltage Booster current consumption Regulator current consumption Stationary current Oscillation frequency Output impedance Booster power conversion efficiency Regulated output voltage fluctuation VOUT Iopr1 Iopr2 IQ fosc ROUT Peff ∆Vreg ∆VOUT•Vreg 90 16 20 150 95 0.2 -18 -18.0 60 50 -2.6 -3.2 100 12.0 2.0 24 200 V V µA µA µA kHz Ω % %/V Symbol VI VO Min. -6.0 -18.0 Typ. Max. -1.2 Unit V V (VDD = 0V, VIN=-5V, Ta=-30 to 85°C) Condition RL=∞, RRV=1MΩ, VO=-18V RL=∞, ROSC=1MΩ RL=∞, RRV=1MΩ VOUT=-15V TC2=TC1=VOUT, RL=∞ ROSC=1MΩ IOUT=10mA IOUT=5mA -18V