S1F76640 Series

S1F76640 Series CMOS DC/DC Converter & Voltage Regulator

DESCRIPTION

S1F76640 is a high efficiency and low power consumption CMOS DC/DC converter. It is roughly divided 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 crystal 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 consumption makes it suitable as a micro power supply for handy devices like hand-held computer.

FEATURES

•High efficiency and low power consumption CMOS DC/DC converter

•Easy three kinds voltage conversions to positive po-

tential side from input voltage VDD (+3.3V)

. From input voltage VDD (+3.3V) to outputs 2×VDD (+6.6V), 3×VDD (+9.9V) and 4×VDD (+13.2V).

•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(VDD=+5V)

•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. μ2A

•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.

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EPSON

S1F70000 Series Technical Manual