RICOH R5326K Series Low Voltage Dual LDO for Automatic Mode Shift - Data Manual, User Guide
Summary
This dual CMOS Low Dropout (LDO) regulator solution provides stable power management for battery-powered devices, ideal for portable electronics, cameras, and home appliances. Featuring automatic mode switching between fast response and ultra-low power modes, it maintains efficiency while offering high ripple rejection (70dB). The manual details the product's comprehensive specifications, including input ranges as low as 1.4V, output stabilization down to 0.8V, standby current of just 5.5μA, and auto-discharge functionality. It is designed for system designers requiring reliable, highly efficient power sources in space-constrained applications.
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R5326K Series
Automatic Mode Shift Low Voltage Dual 150m A LDO
The R5326K Series are CMOS-based auto mode switching dual LDO regulators featuring 150m A output. In auto switching mode, the operation can switch automatically to a fast response mode or a low power mode of the ECO function according to output current. (Automatic switching to fast response mode under IOUT > 3m A conditions or to low power mode under IOUT > 0.6m A conditions.) In low power mode, supply current is as low as 5.5μA. In fast response mode, ripple rejection is 70d B and noise is low. R5326K requires neither ECO pin for switching mode nor microcontroller pin. R5326K supports low voltage, featuring input voltage from 1.4V and output voltage from 0.8V. Standby mode and auto-discharge function are also available (see the Selection Guide). Ceramic capacitors can be used.
FEATURES • Supply Current (ISS2) ·······················Typ. 50μA × 2 (Fast mode, VIN=SET VOUT+1.0V) • Temp. coeff. of Output Voltage ·······Typ. ± 100ppm/°C • Supply Current (ISS1) ·······················Typ. 5.5μA × 2 (Low power mode, same as above) • Line Regulation·······························Typ. 0.02%/V (Fast mode) • Standby Current (Istandby) ·················Typ. 0.1μA × 2 (VIN=6.0V, CE1/CE2="L") • Fold-back Protection Circuit ···········Current limit Typ. 50m A • Dropout Voltage (VDIF) ····················Typ. 0.19V (IOUT=150m A, VOUT=2.8V) • Auto-Discharge function ·················B Version • Ripple Rejection (RR)·····················Typ. 70d B (f=1k Hz), Typ. 60d B (f=10k Hz) • Package··········································DFN(PLP)1820-6 • Input Voltage Range (VIN) ···············1.4V to 6.0V • Ceramic capacitors can be used. ···1μF to 3.3μF • Output Voltage Range (VOUT)··········0.8V to 4.2V∗ (internally fixed) • Output Voltage Accuracy ················± 1%
∗) For information about combination of output voltage, please check our website.
BLOCK DIAGRAMS R5326Kxxx A R5326Kxxx B (Without Auto-Discharge function) (With Auto-Discharge function)
ro lt IF (V CE1 VOUT1 CE1 VOUT1
Error R1_1 Error R1_1
Amp. Amp.
Vref Vref
Current Limit Current Limit
VDD GND VDD GND
Error Error Amp. Amp.
Vref Vref
Current Limit Current Limit
CE2 VOUT2 CE2 VOUT2
SELECTION GUIDES
.xxx : Specify a combination of output voltage for each output using serial
Halogen Free Package Q'ty per Reel Part No.
numbers.
DFN(PLP)1820-6 5,000 pcs R5326K.xxx∗ -TR
.∗ : Select from (.A.) without auto-discharge function or (.B.) with auto-discharge function.
PACKAGES (Top View) TYPICAL CHARACTERISTIC
DFN(PLP)1820-6 R5326K (VR1/VR2) Dropout Voltage vs. Output Current
VOUT=2.8V
1 VOUT2 2 VDD
3 VOUT1 4 CE1 0.05 5 GND 6 CE2
Output Current IOUT(m A)
∗) The tab is substrate level (GND).
APPLICATIONS • Power source for hand-held communication equipment, cameras, and VCRs • Power source for battery-powered equipment • Power source for home appliances
No.EK-138-120403 Dual CMOS LDO Regulator
Page Summary Contents For RICOH R5326K Series Low Voltage Dual LDO for Automatic Mode Shift - Data Manual, User Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 2 |
| File Size | 158.25 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
What input voltage range does the R5326K support?
The input voltage (VIN) range is 1.4V to 6.0V.
Does automatic switching require external pins or microcontrollers?
No, R5326K requires neither an ECO pin nor a microcontroller pin for switch mode operation.
What capacitance can be used with this regulator?
Ceramic capacitors ranging from 1μF to 3.3μF can be used.
How does the automatic switching function work?
It automatically switches to fast response mode (under IOUT 3mA) or low power mode (under IOUT 0.6mA).