RICOH R1161N SERIES User's Guide
Summary
The R1161N Series is a highly versatile CMOS LDO regulator designed for low voltage, low-power applications requiring stable performance. This manual details its architecture, covering specialized features like automatic mode switching via the ECO pin (allowing optimal fast or low power states) and standby mode management via the CE pin. With a 300mA output capacity, this component is ideal for engineers designing battery-powered electronics such as hand-held communication gear, cameras, and consumer equipment needing highly efficient and stable voltage regulation.
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R1161N Series
Manual Mode Shift Low Voltage 300m A LDO
The R1161N Series are CMOS-based manual mode switching LDO regulators with ECO pin featuring 300m A output. By inputting control signals to the ECO pin, the mode of the regulator can be switched to low power mode or fast response mode, thus making both active and sleep modes available for the system. The CE pin can switch the regulator into standby mode.
FEATURES • Supply Current (ISS1)∗·················Typ. 60μA (Fast mode, VIN=SET VOUT+1.0V) • Output Voltage Accuracy ················± 2% (Fast mode) • Supply Current (ISS2)∗·················Typ. 4.5μA (Low power mode, same as above) ± 3% (Low power mode) • Standby Current (Istandby) ············Typ. 0.1μA (Same as above, in standby) • Temp. coeff. of Output Voltage ·······Typ. ± 100ppm/°C • Dropout Voltage (VDIF)∗ ··············Typ. 0.23V (Fast mode, IOUT=300m A) • Line Regulation·······························Typ. 0.01%/V (Fast mode)
Typ. 0.24V (Low power mode, IOUT=300m A) • Fold-back Protection Circuit············Current limit Typ. 50m A
• Ripple Rejection (RR)················Typ. 65d B (f=1k Hz, Fast mode) • Auto-Discharge function ·················D Version • Input Voltage Range (VIN) ··········1.4V to 6.0V • Package··········································SOT-23-5 • Output Voltage Range (VOUT)·····0.8V to 3.3V (internally fixed) • Ceramic capacitors can be used. ···1μF or more (VOUT ≥ 1.0V)
∗) at VOUT=2.8V
BLOCK DIAGRAMS R1161Nxx1A R1161Nxx1B R1161Nxx1D
CE pin "L" active) (CE pin "H" active) (With Auto-Discharge function)
ECO ECO ECO
VDD VOUT VDD VOUT VDD VOUT
ro lt IF
Vref Vref Vref Current Current Current Limit Limit Limit
CE GND CE GND CE GND
SELECTION GUIDES
Part No. .xx. : Specify the output voltage within the range of 0.8V (.08.) to 3.3V (.33.)
Halogen Free Package Q'ty per Reel
in 0.1V steps. R1161N.xx.1.∗ -TR-FE .∗ : Select the polarity of the CE pin from (.A.) "L" active, (.B.) "H" active
SOT-23-5 3,000 pcs
or (.D.) "H" active with auto-discharge function.
PACKAGES (Top View) TYPICAL CHARACTERISTIC
SOT-23-5 R1161N261x Dropout Voltage vs. Output Current
5 4 (Fast Response Mode)
ECO=H
1 VDD 0.20 2 GND
3 CE or CE
4 ECO
5 VOUT 0.05
Output Current IOUT (m A)
APPLICATIONS • Power source for hand-held communication equipment, cameras, and VCRs • Power source for battery-powered equipment • Very stable voltage reference
No.EK-106-120403 CMOS LDO Regulator
Page Summary Contents For RICOH R1161N SERIES User's Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 2 |
| File Size | 198.00 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
How can I switch the regulator between operating modes?
The mode can be switched by inputting control signals to the ECO pin, accessing low power or fast response mode.
What is the standby current consumption of the device?
The typical standby current (Istandby) is 0.1μA.
What capacitor value is necessary for stable operation?
Ceramic capacitors of 1μF or more are required if the output voltage (VOUT) is 1.0V or higher.
Are there built-in protections against overcurrent?
Yes, it features a Fold-back Protection Circuit with a typical current limit of 50mA.