RICOH Manuals

The R5105N Series are CMOS-based microprocessor supervisory circuit, or high accuracy and ultra low supply current voltage detector with built-in delay circuit and watchdog timer. When the supply voltage is down across the threshold, or the watchdog timer does not detect the system clock from the microprocessor, the reset output is generated. The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the accuracy is ±1.0%. The released delay time (Power-on Reset Delay) circuit is built-in, and output delay time is adjustable with an external capacitor, and the accuracy is ±16%*. When the supply voltage becomes higher than the released voltage, the reset state will be maintained during the delay time. The output type of the reset is selectable, Nch open-drain, or CMOS. The time out period of the watchdog timer can be also set with an external capacitor, and the accuracy is ±33%*. There are another 4 products by the difference of packages and the function of voltage detector and watchdog timer. The package of R5105N is SOT-23-6.

The R5105N series are CMOS-based system power ICs with a voltage detector (VD) and watchdog timer (WDT) integrated in a single chip. R5105N monitors the power system of devices equipped with microprocessors and prevents system runaway with a reset signal when a malfunction occurs. The output delay time of the VD and watchdog timeout period/reset time can be adjusted high accuracy by an external capacitor.

R5104V Series are high voltage tolerance CMOS-based microprocessor power management ICs with high accuracy output voltage and detector threshold and with ultra low supply current.

The R5104V Series are CMOS-based system power ICs with a voltage regulator, voltage detector, and watchdog timer integrated in a single chip. The R5104V 's input voltage of Max. 36V (absolute maximum rating: Max. 50V) makes it suitable for use in car applications. The voltage regulator with an external output transistor is capable of outputting approximately 1A, using the PNP transistor of hFE=100 to 300. R5104V monitors the power system of devices equipped with microprocessors and prevents system runaway with a reset signal when a malfunction occurs.

The RP151 Series are CMOS-based dual voltage regulator (LDO) ICs equipped with a voltage detector (VD)

The RP151K Series are CMOS-based dual output LDO regulators with voltage detector featuring 300mA output. In addition to excellent basic performances of RP150K, RP151K contains a voltage detector. The voltage detector monitors the output voltage (VOUT2) × 92% of LDO regulator 2. Just as RP150K, RP151K is available in RoHS compliant DFN(PLP)2020-8 package.

The RP150K Series are CMOS-based dual voltage regulator ICs with high output voltage accuracy, low supply current, low dropout, and high ripple rejection. The output voltage of these ICs is internally fixed with high accuracy (1%). The input voltage range is 2.5V to 5.25V.

The RP150K series are CMOS-based dual output LDO regulators featuring 300mA output. RP150K features supply current as low as 24μA per output, which is substantially lower compared to existing lines. Due to a built-in 0.7Ω (at VOUT=2.8V) on-resistor, RP150K can provide a low dropout voltage. RP150K also features an excellent line transient response, ripple rejection at 80dB, and low noise. The output voltage accuracy is as high as ± 1% and the temperature drift coefficient of output voltage is low at ± 30ppm/°C. RP150K is available in RoHS compliant DFN(PLP)2020-8 package.

The RP154x Series are CMOS-based voltage regulator ICs with high output voltage accuracy, low supply current, low dropout, and high ripple rejection.

The RP154x Series are CMOS-based dual output LDO regulators featuring 300mA output. RP154x features a supply current from 50μA per output, a minimum input voltage from 1.4V and the output voltage can be set from 0.8V to 3.6V (in 0.1V steps). RP154x is available in SOT-23-6 and DFN1216-8 packages. Due to the low minimum input voltage RP154x is able to extend battery life, additionally the LDO has less power dissipation by the low dropout voltage between input and output.

The R5328K series are dual 150mA voltage regulator ICs with 3-mode. The 3-mode describes that they are the inactive standby, the active fast mode, and the active low power mode. The two active modes can be switched over with ECO pin. With this function, the output voltage maintains the level, and the mode can be switched over. The minimum operating voltage is 1.4V, and the output voltage range is from 0.8V to 4.0V.

The R5328K series are CMOS-based dual output LDO regulators with ECO pin featuring 150mA output. By inputting the control signals to into the ECO pin, the operation can be switched between fast response mode and low power mode of the ECO function according to the output current. In low power mode, supply current is as low as 2.5μA. In fast response mode, ripple rejection is 70dB and noise is low. R5328K supports low voltage, featuring input voltage from 1.4V and output voltage from 0.8V. Standby mode and auto-discharge function are also available (see Selection Guide). Ceramic capacitors can be used.

The R5326x Series are CMOS-based voltage regulator ICs with high output voltage accuracy, Typ. 5.5μA low supply current, and remarkably improved transient response compared with the conventional low supply current voltage regulators.

The R5326K series automatic mode shift low voltage dual 150mA LDO is a CMOS-based auto mode switching dual LDO regulator with 150mA output. In auto switching mode, the operation can switch automatically to a fast response mode or a low power mode of the ECO function according to output current. (Automatic switching to fast response mode under IOUT > 3mA conditions or to low power mode under IOUT > 0.6mA conditions.) In low power mode, supply current is as low as 5.5μA. In fast response mode, ripple rejection is 70dB and noise is low. R5326K requires neither ECO pin for switching mode nor microcontroller pin. R5326K supports low voltage, featuring input voltage from 1.4V and output voltage from 0.8V. Standby mode and auto-discharge function are also available (see the Selection Guide). Ceramic capacitors can be used.

The RP153L Series is a CMOS-based voltage regulator IC with high output voltage accuracy, low supply current, low dropout, and high ripple rejection. Each IC consists of a voltage reference unit, an error amplifier, resistors for setting output voltage, a current limit circuit, and a chip enable circuit. These ICs have low dropout voltage due to a built-in transistor with low ON resistance, and the chip enable function extends the battery life of each system. The line transient response and load transient response of the RP153L Series are excellent, making them very suitable for power supply in handheld communication equipment. The output voltage of these ICs is internally fixed with high accuracy. The ICs are packaged in DFN1216-8, allowing for high-density mounting on boards. In RP153L, the power supply of each circuit can be individually supplied. The transient response characteristic of the D and E versions has been improved.