R1518x Series

1A 36V Input Low Supply Current LDO

Data Sheet / Flyer
Data Sheet * Flyer

R1518x is a CMOS-based LDO that specifically designed for automotive applications featuring 1A output current and 36V input voltage. In addition to a conventional regulator circuit, R1518x consists of a constant slope circuit as a soft-start function, a fold-back protection circuit, a short current limit circuit, and a thermal shutdown circuit. Besides the low supply current by CMOS, the operating temperature is −40°C to 105°C and the maximum input voltage is 36V, the R1518x is very suitable for power source of car accessories.
R1518x is available in R1518xxxxB/D/E/F with the internally fixed output voltage, and R1518xxxxD/F with the auto-discharge function at standby.
R1518x001C can adjust the output voltage with an external resistor. R1518xxxxB/C/D internally fixes the softstart time at 120µs (Typ). R1518xxxxE/F can adjust the soft-start time with an external capacitor.
R1518x is available in two packages for ultra high wattage: HSOP-6J and TO-252-5-P2.

Input Voltage Range (Maximum Rating) 3.5V to 36.0V (50.0V)
Operating Temperature Range −40°C to 105°C
Supply Current Typ. 18µA
Standby Current Typ. 0.1µA
Dropout Voltage Typ. 0.7V (IOUT = 1 A, VOUT = 5.0 V)
Output Voltage Accuracy ±0.8% (VOUT ≤ 5.0 V)
Line Regulation Typ. 0.01%/V
Packages HSOP-6J, TO-252-5-P2
Output Voltage Range R1518xxxxB/D/E/F: 2.5V/ 3.3V/ 3.4V/ 5.0V/ 6.0V/ 8.5V
*Contact Ricoh sales representatives for other voltages.
R1518x001C: Adjustable from 2.5V to 12.0V with external resistor
Feedback Voltage: 2.5V
Built-in Short Current Limit Circuit Typ. 150mA
Built-in Fold-Back Protection Circuit Min. 1A
Built-in Thermal Shutdown Circuit Typ. 160°C
Built-in Soft-start Circuit Typ.120µs
R1518xxxxE/F: Adjustable Time Setting with External Capacitors.
Ceramic Capacitors can be used R1518xxxxB/D/E/F: 0.1µF or more
R1518x001C: 1.0µF or more

  • Power source for home appliances such as refrigerators, rice cookers, electric water warmers.
  • Power source for notebook PCs, digital TVs, telephones, private LAN systems.
  • Power source for office equipment such as copiers, printers, facsimiles, scanners, and projectors.

Data Sheet Flyer Package Info. Quality Assurance Data
R1518x Series R1518x Series HSOP-6J Reliability
TO-252-5-P2 Reliability
All PDF files are less than 1MB unless otherwise stated.

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