Description; Features - Epson Power Supply IC S1F70000 Technical Manual

S1F76640 Series
S1F76640 Series CMOS DC/DC Converter & Voltage Regulator

DESCRIPTION

S1F76640 is a high efficiency and low power con-
sumption CMOS DC/DC converter. It is roughly di-
vided into two portions, step-up circuit and stabilization
circuit. The step-up circuit can provide 2 times step-up
outputs (3.6 to 11V), 3 times step-up outputs (5.4 to
16.5V) or 4 times step-up outputs (7.2 to 22V) of input
voltages (1.8 to 5.5V). If external parts (diode, capaci-
tor) are attached to it, it can realize step-up operations of
higher magnifications.
The stabilization circuit enables to set outputs to any
voltages. Since the stabilization circuit can provide
three kinds of minus temperature gradients to stabilized
outputs, it is optimum as a power supply for liquid crys-
tal display (LCD).
Also, S1F76640 enable to drive ICs (liquid crystal
driver, analog IC, etc.), which requires another power
supply in addition to logic main power supply, with a
single power supply. Also, its small power consump-
tion makes it suitable as a micro power supply for handy
devices like hand-held computer.
2–38

FEATURES

• High efficiency and low power consumption CMOS
DC/DC converter
• Easy three kinds voltage conversions to positive po-
tential side from input voltage V
. From input voltage V
(+6.6V), 3 V
• Attachment of external parts (diode, capacitor)
makes step-up operations of higher magnifications
possible.
• Built-in output voltage stabilization circuit
· External resistor enables to set any output voltages.
• Output current : Max. 20mA(V
• Power conversion efficiency : Typ. 95%
• 3 kinds of reference voltages with negative tempera-
ture gradient characteristic suitable for LCD drive
power supply can be selected.
• Power off operation by external signal
· Static current at power off time : Max. 2 A
• Possibility of high magnification step-up operation
by series connection
• Low voltage operation .... Optimum for battery drive
• Built-in CR oscillator
• SSOP2-16pin .......... S1F76640M0A0
Bare Chip ................ S1F76640D0A0
• Radiation-resistant design has not been provided for
this specification.
EPSON
(+3.3V)
DD
(+3.3V) to outputs 2 V
DD
(+9.9V) and 4 V
DD DD
=+5V)
DD
DD
(+13.2V).
S1F70000 Series
Technical Manual