RICOH R1191x SERIES Owner's Manual User Guide
Summary
The R1191x Series is a high-precision 300mA LDO regulator designed for stable power supply with ultra-low quiescent current draw in both Fast and Low Power modes. Featuring built-in reverse current protection, it is ideal for backup circuits and energy-efficient digital systems. This manual provides comprehensive details on its operation, including pin configurations, selectable packages (SOT-23-5, DFN1616-6), electrical characteristics, and optimal applications in audio/visual equipment and home appliances.
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R1191x SERIES
300m A LDO REGULATOR with the Reverse Current Protection
NO.EA-229-111026
OUTLINE R1191x Series are a low supply current voltage regulator with high output voltage accuracy. The maximum operating voltage is 16V. These ICs can switch to the fast mode and the low power mode by the low power / fast mode changer pin (ECO pin) without changing the output voltage value. Each of these ICs consists of a voltage reference unit, an error amplifier, a resistor-net for voltage setting, a short current limit circuit, a thermal shutdown circuit and a chip enable circuit. Moreover, the R1191x Series has the reverse current protection function, which protects the reverse current flow into VDD pin when the output pin voltage becomes higher than the VDD pin voltage. Thus it is suitable for the back-up circuit. Since the packages for these ICs are SOT-89-5, SOT-23-5 and DFN1616-6, therefore high density mounting of the ICs on boards is possible.
FEATURES • Supply Current Typ. 50μA (Fast Mode),
Typ. 6.0μA (Low Power Mode)
• Standby Mode Typ. 0.3μA • Reverse Current................................................... Max. 0.1μA • Output Current Min. 300m A • Input Voltage Range 3.5V to 16.0V • Output Voltage Range.......................................... 2.0V to 15.0V (0.1V steps) (For other voltages, please refer to MARK INFORMATIONS.) • Output Voltage Accuracy...................................... ±1.5% (Fast Mode)
±2.5% (Low Power Mode)
• Temperature-Drift Coefficient of Output Voltage Typ. ±80ppm/°C • Dropout Voltage Typ. 0.55V (Fast Mode, IOUT=300m A ,VOUT=5.0V)
Typ. 0.70V (Low Power Mode, IOUT=300m A,VOUT=5.0V)
• Ripple Rejection................................................... Typ. 60d B (f=1k Hz,VOUT=5.0V, Fast Mode) • Line Regulation Typ. 0.02%/V (Fast Mode) • Packages ............................................................ DFN1616-6, SOT-23-5, SOT-89-5 • Built-in fold-back protection circuit Typ. 50m A (Current at short mode) • Built-in Thermal Shutdown Circuit........................ Shutdown Temperature at 150°C • Ceramic capacitors are recommended to be used with this IC ····CIN=2.2μF or more, COUT=4.7μF or more
APPLICATIONS • Power source for digital home appliances • Power source for audio visual equipment
Page Summary Contents For RICOH R1191x SERIES Owner's Manual User Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 33 |
| File Size | 3.44 MB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What is the maximum operating voltage for this regulator?
The automatic switching voltage regulator has a maximum operating voltage of 16V.
How can I optimize power consumption using this IC?
You can switch between Fast Mode (Typ. 50μA supply current) and Low Power Mode (Typ. 6.0μA supply current) via the ECO pin.
Is this regulator suitable for backup circuits?
Yes, it includes a reverse current protection function, making it suitable for back-up circuits when output voltage exceeds VDD.
What is the recommended capacitance for proper operation?
It is recommended to use at least CIN=2.2μF and COUT=4.7μF ceramic capacitors.