RICOH R1161x SERIES Owner's Manual User Guide

Summary

This CMOS voltage regulator IC series provides ultra-high accuracy power management for sensitive electronics. Featuring three distinct operating modes—Standby, Fast Transient, and Low Power—the R1161x maintains stable output voltage while minimizing current consumption across various applications. The manual details the technical specifications, advanced features (including dropout protection), selection guide, and integration specifics necessary for engineers designing battery-powered devices, cameras, or general precision power sources needing low ripple rejection and reliable performance.

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R1161x SERIES

3-MODE 300m A LDO REGULATOR

NO.EA-106-120404

OUTLINE The R1161x Series are CMOS-based voltage regulator ICs with high output voltage accuracy, low supply current, and low ON-resistance. Each of these voltage regulator ICs consists of a voltage reference unit, an error amplifier, resistors for setting output voltage, a current limit circuit, and a chip enable circuit. These ICs perform with low dropout voltage and a chip enable function. To prevent the destruction by over current, current limit circuit is included. The R1161x Series have 3-mode. One is standby mode with CE or standby control pin. Standby mode realizes ultra small consumption current off mode. Other two modes are realized with ECO pin. Fast Transient Mode (FT mode) and Low Power Mode (LP mode) are alternative with ECO pin. Consumption current is reduced at Low Power Mode compared with Fast Transient Mode. Output voltage is maintained between FT mode and LP mode. The output voltage of these ICs is internally fixed with high accuracy. Since the packages for these ICs are SOT-23-5, SON-6 (Limited), and HSON-6 (Limited), high density mounting of the ICs on boards is possible.

FEATURES • Supply Current ..................................................Typ. 3.5μA (Low Power Mode, VOUT<1.6V), Typ. 80μA (Fast Transient Mode, VOUT<1.8V) Typ. 60μA (Fast Transient Mode, VOUT ≥ 1.8V) • Standby Mode ...................................................Typ. 0.1μA • Dropout Voltage ................................................Typ. 0.48V (IOUT=300m A Output Voltage=1.0V Type) Typ. 0.31V (IOUT=300m A Output Voltage=1.5V Type) Typ. 0.23V (IOUT=300m A Output Voltage=3.0V Type) • Ripple Rejection................................................Typ. 65d B (f=1k Hz, FT Mode) • Temperature-Drift Coefficient of Output Voltage Typ. ±100ppm/°C • Line Regulation .................................................Typ. 0.01%/V (at Fast Transient Mode) • Output Voltage Accuracy...................................±2.0%(±3.0% at LP Mode) • Packages .........................................................SOT-23-5, SON-6 (Limited), HSON-6 (Limited) • Output Voltage ..................................................0.8V to 3.3V (0.1V steps)

(For other voltages, please refer to MARK INFORMATIONS.)

• Input Voltage .....................................................Min. 1.40V (VOUT ≥ 1.0V) Min. 1.45V (VOUT<1.0V) • Built-in fold-back protection circuit ....................Typ. 50m A (Current at short mode) • External Capacitors...........................................CIN = COUT = Tantalum 1.0μF (VOUT<1.0V) CIN = COUT =Ceramic 1.0μF (VOUT ≥ 1.0V)

APPLICATIONS • Precision Voltage References. • Power source for electrical appliances such as cameras, VCRs and hand-held communication equipment. • Power source for battery-powered equipment.

Page Summary Contents For RICOH R1161x SERIES Owner's Manual User Guide

Page 1 R1161x SERIES 3-MODE 300m A LDO REGULATOR NO.EA-106-120404 OUTLINE The R1161x Series are CMOS-based voltage regulator ICs with high output voltage accuracy, low supply current, and low ON-resistance. ...

Page 2 BLOCK DIAGRAM R1161xxxx A R1161xxxx B ECO ECO VDD VOUT VDD VOUT Vref Vref Current Current Limit Limit CE GND CE GND R1161xxxx D VDD VOUT Vref Current Limit CE GND

Page 3 SELECTION GUIDE The output voltage, chip enable polarity, auto discharge function, and package, etc. for the ICs can be selected at the user’s request. Product Name Package Quantity per Reel Pb Free H...

Page 4 PIN CONFIGURATIONS SOT-23-5 SON-6 HSON-6 Top View Bottom View Top View Bottom View 4 5 (mark side) PIN DESCRIPTIONS • SOT-23-5 Pin No. Symbol Description 1 VDD Input Pin 2 GND Ground Pin 3 CE or CE Ch...

Page 5 ABSOLUTE MAXIMUM RATINGS Symbol Item Rating Unit VIN Input Voltage 6.5 V VECO Input Voltage (ECO Pin) -0.3 ~ 6.5 V VCE Input Voltage ( CE /CE Pin) -0.3 ~ 6.5 V VOUT Output Voltage -0.3 ~ VIN+0.3 V IOU...

Page 6 ELECTRICAL CHARACTERISTICS • R1161xxxx A Topt=25°C Symbol Item Conditions Min. Typ. Max. Unit Output Voltage (FT Mode) VIN=Set VOUT+1V, VECO=VIN 1μA ≤ IOUT ≤ 30m A Note 1 (-30m V) ×1.02 (30m V) Output...

Page 7 • R1161xxxx B/D Topt=25°C Symbol Item Conditions Min. Typ. Max. Unit Output Voltage (FT Mode) VIN=Set VOUT+1V,VECO=VIN 1μA ≤ IOUT ≤ 30m A Note 1 (−30m V) ×1.02 (30m V) Output Voltage (LP Mode) VIN=Set...

Page 8 ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE Topt=25°C Dropout Voltage VDIF (V) VDIF (ECO=H) VDIF (ECO=L) Output Voltage VOUT (V) Condition Typ. Max. Typ. Max. 0.8=VOUT 0.620 0.850 0.670 0.900 0.9=VOU...

Page 9 VDD OUT C1 R1161xxxxx GND SERIES CE ECO Fig.3 Supply Current vs. Input Voltage Test Circuit VDD OUT C1 R1161xxxxx GND SERIES CE ECO Fig.4 Output Voltage vs. Temperature Test Circuit VDD OUT C1 R1161xx...

Page 10 VDD OUT R1161xxxxx GND SERIES ↓Pulse Generator CE ECO Fig. 7 Ripple Rejection Test Circuit VDD OUT R1161xxxxx GND SERIES ↓Pulse Generator CE ECO Fig.8 Input Transient Response Test Circuit VDD OUT C1 ...

Page 11 VDD OUT C1 R1161xxxxx GND SERIES CE ECO Pulse Generator Fig.11 MODE Transient Response Test Circuit VDD OUT C1 R1161xxxxx Spectrum GND SERIES Analyzer SR CE ECO C1=Ceramic 1.0μF C2=Ceramic Capacitor F...

Page 12 ut pu t V ol ta ge UT (V ut pu t V ol ta ge (V ut pu t V ol ta ge (V TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current R1161x08xx (ECO=H) R1161x08xx (ECO=L) VIN =2.8V VIN =2.8V ut pu t V ol...

Page 13 R1161x ut pu t V ol ta ge UT (V ut pu t V ol ta ge UT (V ut pu t V ol ta ge UT (V R1161x33xx (ECO=H) R1161x33xx (ECO=L) 3.5 3.5 VIN =5.3V VIN =5.3V Output Current l OUT (m A) Output Current l OUT (m A...

Page 14 up pl ur re nt IS (μ ut pu t V ol ta ge (V ut pu t V ol ta ge UT (V R1161x26xx (ECO=H) R1161x26xx (ECO=L) IOUT= 1m A IOUT= 1m A IOUT=30m A IOUT=30m A IOUT=50m A IOUT=50m A Input Voltage VIN (V) Input ...

Page 15 up pl ur re nt IS (μ up pl ur re nt IS (μ up pl ur re nt IS (μ R1161x15xx (ECO=H) R1161x15xx (ECO=L) Input Voltage VIN (V) Input Voltage VIN (V) R1161x26xx (ECO=H) R1161x26xx (ECO=L) up pl ur re nt IS...

Page 16 ut pu t V ol ta ge UT (V ut pu t V ol ta ge UT (V ut pu t V ol ta ge UT (V 4) Output Voltage vs. Temperature R1161x08xx (ECO=H) R1161x08xx (ECO=L) 0.84 0.84 Temperature Topt ( Temperature Topt ( ut pu...

Page 17 up pl ur re nt Is s H (μ up pl ur re nt Is s H (μ R1161x ut pu t V ol ta ge UT (V R1161x33xx (ECO=H) R1161x33xx (ECO=L) 3.37 3.37 Temperature Topt ( Temperature Topt ( 5) Supply Current vs. Temperatur...

Page 18 ro po ut ol ta ge IF _H (V up pl ur re nt Is s H (μ up pl ur re nt Is s H (μ R1161x26xx (ECO=H) R1161x26xx (ECO=L) Temperature Topt ( Temperature Topt ( R1161x33xx (ECO=H) R1161x33xx (ECO=L) ro po ut ...

Page 19 ro po ut ol ta ge IF _H (V ro po ut ol ta ge IF _H (V R1161x ro po ut ol ta ge IF _H (V R1161x09xx (ECO=H) R1161x09xx (ECO=L) 0.8 0.8 0.7 0.7 Output Current IOUT (m A) Output Current IOUT(m A) R1161x1...

Page 20 ro po ut ol ta ge IF _H (V ro po ut ol ta ge IF _H (V ro po ut ol ta ge IF _H (V R1161x26xx (ECO=H) R1161x26xx (ECO=L) 0.40 0.40 0.35 0.35 Output Current IOUT (m A) Output Current IOUT (m A) R1161x33x...

Page 21 Ip pl ej ec tio _H (d ip pl ej ec tio (d R1161x ip pl ej ec tio (d 8) Ripple Rejection vs. Input Bias (Topt=25°C CIN=none, COUT=Ceramic 1.0μF Ripple 0.2VP-P) R1161x26xx (IOUT=1m A) R1161x26xx (IOUT=30...

Page 22 Ip pl ej ec tio _H (d Ip pl ej ec tio _H (d Ip pl ej ec tio _H (d R1161x08xx (ECO=H) R1161x08xx (ECO=L) VIN=1.8VDC+0.2Vp-p, VIN=1.8VDC+0.2Vp-p, COUT=Tantal 2.2μF COUT = Tantal 2.2μF IOUT = 1m A IOUT =...

Page 23 Ip pl ej ec tio _H (d Ip pl ej ec tio _H (d R1161x Ip pl ej ec tio _H (d R1161x15xx (ECO=H) R1161x15xx (ECO=L) VIN=2.5VDC+0.2Vp-p, VIN=2.5VDC+0.2Vp-p, COUT=1.0μF COUT=1.0μF IOUT = 1m A IOUT = 30m A IO...

Page 24 Ip pl ej ec tio _H (d Ip pl ej ec tio _H (d Ip pl ej ec tio _H (d R1161x26xx (ECO=H) R1161x26xx (ECO=L) VIN=3.6VDC+0.2Vp-p, VIN=3.6VDC+0.2Vp-p, COUT = Ceramic 2.2μF COUT = Ceramic 2.2μF IOUT = 1m A IO...

Page 25 ut pu t V ol ta ge (V ut pu t V ol ta ge (V ut pu t V ol ta ge (V 10) Input Transient Response (CIN = none, tr=tf=5μs) R1161x08xx (ECO=H) R1161x08x (ECO=L) IOUT=30m A, IOUT=10m A, COUT = Tantalum 1.0μ...

Page 26 ut pu t V ol ta ge (V ut pu t V ol ta ge (V ut pu t V ol ta ge (V 11) Load Transient Response (tr=tf=0.5μs) R1161x08xx (ECO=H) R1161x08xx (ECO=H) VIN=1.8V VIN=1.8V CIN= tantalum 1.0μF,COUT = tantalum ...

Page 27 ut pu t V ol ta ge (V ut pu t V ol ta ge (V ut pu t V ol ta ge (V R1161x10xx (ECO=H) R1161x10xx (ECO=H) VIN=2.0V, VIN=2.0V, CIN= Ceramic 1.0μF, COUT = Ceramic 2.2μF CIN = Ceramic 1.0μF COUT = Ceramic ...

Page 28 ut pu t V ol ta ge (V ut pu t V ol ta ge (V ut pu t V ol ta ge (V R1161x26xx (ECO=H) R1161x26xx (ECO=H) VIN=3.6V, VIN=3.6V, CIN = Ceramic 1.0μF COUT = Ceramic 2.2μF CIN = Ceramic 1.0μF COUT = Ceramic ...

Page 29 In pu t V ol ta ge (V In pu t V ol ta ge (V In pu t V ol ta ge (V 12) Turn on speed with CE pin R1161x08xx (ECO=H) R1161x08xx (ECO=L) VIN=1.8V, CIN = Tantalum 1.0μF VIN=1.8V, CIN = Tantalum 1.0μF COUT...

Page 30 In pu t V ol ta ge (V In pu t V ol ta ge (V In pu t V ol ta ge (V R1161x33xx (ECO=H) R1161x33xx (ECO=L) VIN=4.3V, CIN = Ceramic 1.0μF VIN=4.3V, CIN = Ceramic 1.0μF COUT = Ceramic 1.0μF COUT = Ceramic ...

Page 31 In pu t V ol ta ge (V In pu t V ol ta ge (V In pu t V ol ta ge (V 13) Turn-off Speed with CE R1161x08x D R1161x08x D VIN=1.8V, CIN = Tantalum 1.0μF VIN=1.8V, CIN = Tantalum 1.0μF COUT = Tantalum 1.0μF...

Page 32 np ut ol ta ge UT (V np ut ol ta ge (V 14)Output Voltage at Mode alternative point R1161x08xx R1161x08xx VIN=1.8V, CIN = Ceramic 1.0μF VIN=1.8V, CIN = Ceramic 1.0μF COUT = Tantalum 1.0μF COUT = Tantal...

Page 33 np ut ol ta ge UT (V R1161x R1161x26xx R1161x26xx VIN=3.6V, CIN = Ceramic 1.0μF VIN=3.6V, CIN = Ceramic 1.0μF COUT = Ceramic 1.0μF COUT = Ceramic 1.0μF VECO = 0V↔3.6V VECO=0V↔3.6V 2.61 IOUT = 1m A IOU...

Page 34 TECHNICAL NOTES VDD OUT C1 R1161xxxxx GND SERIES CE ECO When using these ICs, consider the following points: 1.Mounting on PCB Make VDD and GND lines sufficient. If their impedance is high, noise pick...

Page 35 ESR vs. Output Current When using these ICs, consider the following points: In these ICs, phase compensation is made for securing stable operation even if the output current is varied. For this purpos...

Page 36 R1161x26xx (ECO=H) R1161x26xx (ECO=L) VIN=3.0V to 6.0V, VIN=3.0V to 6.0V, CIN = Ceramic 1.0μF COUT = Ceramic 1.0μF CIN = Ceramic 1.0μF COUT = Ceramic 1.0μF Output Current l OUT (m A) Output Current l ...

Page 37 1. The products and the product specifications described in this document are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before decid...

Manual Details

Brand	Ricoh
Pages	37
File Size	506.16 KB
Published	May 31, 2026

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