RICOH RP108J SERIES Low Input Voltage 3A LDO Regulator User Guide
Summary
The RP108J Series is a high-performance, low-dropout voltage regulator ideal for powering modern, low-voltage LSI in portable and battery-operated electronics. Featuring 3A output capability and advanced protection circuits—including thermal shutdown, constant slope soft-start, and fold-back protection—it ensures robust power delivery even under demanding conditions. This manual provides comprehensive details on features, operational limits, adjustable configurations, and proper integration for designers building high-density devices such as portable cameras and home appliances.
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RP108J SERIES
Low Input Voltage 3A LDO Regulator
NO.EA-203-111018
OUTLINE The RP108J Series are CMOS-based voltage regulator ICs featuring 3A output with low ON-resistance. Each IC of this series consists of a voltage reference unit, an error amplifier, resistor-net for voltage setting, a fold-back protection circuit, and a thermal shutdown circuit. This series features both low supply current and high output current, and the dropout voltage is much smaller than bi-polar's. The minimum input voltage is as low as 1.6V and the output voltage can be set from 0.8V, therefore it can be connected with the DC/DC converter as the latter power supply for high density LSI that is operated by low output voltage. The output voltage of RP108J081x is externally adjustable by using external divide resistors. The CE pin of the RP108J Series can switch the regulator to standby mode. In addition to a fold-back protection circuit, which is already built in the conventional regulators, this series contain a thermal shutdown circuit, a constant slope circuit as a soft-start function and a reverse current protection circuit. Ceramic capacitors can be used.
FEATURES • Output Current Min. 3A • Supply Current Typ. 350μA • Standby Current Typ. 2μA • Input Voltage Range 1.6V to 5.25V • Output Voltage Range.................................................. 0.8V to 4.2V (0.1V steps) (For other voltages, please refer to MARK INFORMATIONS.) • Output Voltage Accuracy.............................................. ±1.0% (±15m V accuracy, When VOUT ≤ 1.5V) • Output Voltage Temperature-drift Coefficient ........... Typ. ±100ppm/°C • Ripple Rejection........................................................... Typ. 65d B (f =1k Hz, VOUT=2.8V) • Dropout Voltage Typ. 0.51V (VOUT=2.8V) • Line Regulation Typ. 0.1%/V • Package TO-252-5-P2 • Built-in Fold-back Protection Circuit............................. Typ. 220m A • Built-in Thermal Shutdown Circuit................................ Stops at 165°C • Built-in Constant Slope Circuit • Built-in Reverse Current Protection Circuit • Ceramic capacitors are recommended to be used with this IC ····· 10μF or more
APPLICATIONS • Power source for battery-powered equipments. • Power source for portable communication equipments such as cameras and VCRs. • Power source for electrical home appliances.
Page Summary Contents For RICOH RP108J SERIES Low Input Voltage 3A LDO Regulator User Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 21 |
| File Size | 531.65 KB |
| Published | June 04, 2026 |
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Frequently Asked Questions
What is the minimum input voltage range?
The input voltage range can be as low as 1.6V up to 5.25V.
How do I adjust or set the fixed output voltage?
For external adjustment, use external divide resistors; for a fixed output, connect the VOUT pin to the VFB pin.
What protective features does this regulator include?
It includes built-in fold-back protection (Typ. 220mA), thermal shutdown circuits, constant slope function, and reverse current protection.
Are specific components recommended for use with this IC?
Yes, using ceramic capacitors of 10μF or more is recommended.