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
