PF1098-01
SCI7661C /M
SCI7661C0B/M0B
0B
0B
DC-DC Converter
e
ltag
Vo ion
w
Loperat cts
O odu
Pr
q 95% Typical Power Efficiency
q Doubled or Tripled Output Voltage
q Internal Voltage Regulator
s DESCRIPTION
The SCI7661C0B/M0B 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 (-3.6V to -12V) or tripled output voltage (-5.4V to -18V) from the input (-1.8 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 VI (-5V) to VI (+5V), 2 VI (+10V), 2VI (-10V) or 3VI (-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. 2µA
q Cascade connection – two device connected: VI = -5V, VO = -20V)
q On-chip C-R oscillator
q Package ................................... SCI7661C0B: DIP-14pin (plastic)
SCI7661M0B: SOP5-14pin (plastic)
SCI7661MBB: SSOP2-16pin (plastic)
s BLOCK DIAGRAM
VI
CAP1–
CAP1+
Voltage
Converter
(I)
CAP2–
CAP2+
Temperature Gradient
Select circuit
CR
Oscillator
Voltage Regulator
OSC1
OSC2
Reference Voltage
Generator
VDD
TC1
TC2
Poff
RV
Voltage
Converter
(II)
VREG
VO
Booster
Regulator
1
