R1518x Series

1 A 36V Input Low Supply Current LDO

NO.EA−329−170112

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OUTLINE

R1518x is a CMOS-based LDO that specifically designed for automotive applications featuring 1 A output

current and 36 V 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 36 V, 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 soft-

start time at 120 µs (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.

FEATURES

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Input Voltage Range (Maximum Rating) ·············· 3.5 V to 36.0 V (50.0V)

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Operating Temperature range ···························

40°C to 105°C

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Supply Current··············································· Typ. 18 µA

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Standby Current············································· Typ. 0.1 µA

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Line Regulation·············································· Typ. 0.01%/V

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Packages ····················································· HSOP-6J, TO-252-5-P2

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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 2.5 V to 12.0 V

with external resistor

Feedback Voltage: 2.5 V

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Built-in Short Current Limit Circuit ······················ Typ. 150 mA

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Built-in Fold-Back Protection Circuit···················· Min. 1A

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Built-in Thermal Shutdown Circuit ······················ Typ. 160°C

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Built-in Soft-start Circuit ··································· Typ.120 µs

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R1518xxxxE/F: Adjustable Time Setting with External 

Capacitors.

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Ceramic Capacitors can be used ······················· R1518xxxxB/D/E/F: 0.1 µF or more

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R1518x001C: 1.0 µF or more

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