R1517x Series

500 mA 36V Input Low Supply Current LDO

NO. EA−304−170112

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OUTLINE

R1517x is a CMOS-based LDO that specifically designed featuring 500 mA output current and 36 V input voltage.

In addition to a conventional regulator circuit, R1517x 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

R1517x is very suitable for power source of car accessories. R1517x supports the internal fixed output voltage

type of R1517xxxxB/D/E/F and the adjustable output voltage setting type, which is controlled by external

resistances, of R1517x001C. As for the soft-start time, R1517x is fixed internal in R1517xxxxB/C/D and is set to

120 µs (Typ). And the soft-start time in R1517xxxxE/F is adjustable by external capacitors. R1517x supports the

auto-discharge function at standby in R1517xxxxD/F. R1517x is available in two packages for ultra-high wattage:

HSOP-6J and TO-252-5-P2.

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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 ······································· R1517xxxxB/D/E/F: 2.5 V/3.3 V/3.4 V/5.0 V/ 8.5V

* Contact Ricoh sales representatives for other voltages.

R1517x001C: Adjustable from 2.5 V to 12.0 V with External

Resistors.

Feedback Voltage: 2.5 V

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Built-in Short Current Limit Circuit ························ Typ. 75 mA

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Built-in Fold-Back Protection Circuit······················ Min. 500 mA

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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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R1517xxxxE/F: Adjustable Time Setting with External

Capacitors.

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Usable Ceramic Capacitors ································ R1517xxxxB/D/E/F: 0.1 µF or more

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R1517x001C: 1.0 µF or more

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