R1501x SeriesAEC-Q100 Certified

1A LDO Regulator (Operating Voltage up to 24V) for Automotive Applications


Data Sheet
Data Sheet

The R1501x is a CMOS-based positive voltage regulator (VR) IC specifically designed for automotive applications. The R1501xxxxB has features of high input voltage operating, 1A output current drive, and low supply current.
A DMOS transistor*1 is used for the driver, high voltage operating and low on resistance (0.6Ω at VOUT = 10V) device is realized. A standard regulator circuit with a current limit circuit and a thermal shutdown circuit are built in this IC.

As the operating temperature range is from −40°C to 105°C and maximum input voltage is up to 24V, this IC is suitable for the constant voltage source for car accessories.
The regulator output voltage is fixed in this IC. Output voltage accuracy is ±2.0% and output voltage range is from 3.0V to 12.0V with a step of 0.1V, and from 12.5V to 18.0V with a step of 0.5V. The chip enable pin realizes ultra low supply current standby mode.

The packages for this IC are the HSOP-6J for high density mounting of the IC on boards, and the TO-252-5-P2 for high wattage.

  • *1The DMOS (Double Diffused MOS) transistor adopted by this IC is characterized by a double diffusion structure which comprises a low density n-type (channel) diffused layer and a high density p-type (sources) diffused layer from the edge of the gate electrode. This IC possesses outstanding properties of high operating voltage and low on-resistance, which have been achieved by the channel length scaled down to submicron dimensions and decreased thickness of the gate oxide film.


Input Voltage Range (Maximum Rating) 3.0V to 24.0V (36.0V)
Supply Current (ISS) Typ. 70µA
Standby Current (Istandby) Typ. 0.1µA
Output Current (IOUT) Min. 1A
Ripple Rejection (RR) Typ. 60dB (VSET = 5.0V)
Output Voltage Range (VOUT) 3.0V to 12.0V (0.1V steps)
12.5V to 18.0V (0.5V steps)
Output Voltage Accuracy ±2%
Temperature-Drift Coefficient of Output Voltage Typ. ±100ppm/°C
Line Regulation Typ. 0.05%/V
Packages HSOP-6J, TO-252-5-P2
Operating Temperature range −40°C to 105°C
Built-in Current Limit Circuit  
Built-in Fold-Back Circuit  
Built-in Thermal Shutdown Circuit  


  • Power source for car accessories including car audio equipment, car navigation system, and ETC system.

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Data Sheet Package Quality Assurance Data Suffix Composition & Content*1
R1501x Series HSOP-6J Reliability -AE Sn (Sn: 100%)
TO-252-5-P2 Contact us*2 -JE Sn (Sn: 100%)
Reliability -AE
  • *1The composition of the product cannot be specified.
  • *2The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.

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