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Ricoh launches 42 V system power supply with ultra-low current consumption watchdog timer

Aug. 28, 2017
Ricoh Electronic Devices Co., Ltd.

Ricoh Electronic Devices Co.,Ltd. has launched the R5114 series and R5115 series, ultra-low current consumption watchdog timer.

The R5114 series and R5115 series are high-voltage products with 42 V maximum operating voltage while having a low current consumption of 8.5 µA at operation and 0.2 µA at standby.
These devices stop monitoring a pulse when the LDO load current drops to a certain value or less.
Window type watchdog timer of the R5115 series enhances the safety of system design.

The R5114 series and R5115 series have lineups of four quality grades to meet various applications including general automotive equipment, automotive accessories, industrial equipment, and consumer equipment.


Input Voltage Range (Maximum Rating) 3.5 V to 42 V (50 V) 
Operating Temperature Range -40°C to 125°C (Class K, Class A, Industrial)
-40°C to 105°C (Consumer)
Supply Current Typ. 8.5 µA (at the time of a watchdog timer stop)
Typ. 13.5 µA (at the time of a watchdog timer operate)
Standby Current Typ. 0.2 µA
Dropout Voltage Typ. 0.80 V (IOUT=250 mA, VOUT=5.0 V)
Line Regulation Typ. 0.01%/V
(3.5 V ≤ VSET+0.5 V ≤ VIN ≤ 42 V, IOUT=1 mA)
Output Voltage Standard setting voltage 3.3 V, 5.0 V
(3.3 V to 5.0 V setable by 0.1 V steps)
Output Voltage Accuracy ±0.6% (25°C)
±1.6% (-40°C to 125°C/105°C)
Detection Voltage 2.5 V to 4.8 V (setable by 0.1 V steps)
Detection Voltage  Accuracy ±0.6% (25°C)
±1.6% (-40°C to 125°C/105°C)
Short-circuit Current Limit Typ. 95 mA
Output Current Limit Typ. 440 mA
Thermal Shutdown Temperature Threshold Typ. 170°C
Ceramic capacitors are recommended to be use with this IC 0.1 µF or more
Package HSOP-8E, HSOP-18

Quality Grades

Grades Applications Operating Temperature Range Guaranteed Specs Temperature Range Screening
Low 25°C High
Automotive, Class K General Automotive Equipment −40°C to 125°C −40°C to 125°C * * *
Automotive, Class A Automotive Accessories −40°C to 125°C 25°C   * *
Industrial Industrial Equipment −40°C to 125°C 25°C   * *
Consumer Consumer Equipment −40°C to 105°C 25°C   *  

Image: R5115 Series
R5115 Series (HSOP-18, HSOP-8E)