
Global		RICOH Co.,Ltd. Electronic Devices Company	\| Site Map \|

Products & Solutions > Industrial Products > Electronic Devices > Power Management ICs
> DC/DC Converters > Step-up DC/DC Converter Lineup > R1210Nxx1x Series


	Products
		Power Management ICs
		Real-time clock ICs
		PC Interface
		Communication LSI / Image Processing LSI
		Manufacturing Service
		Product List

	Search ricoh.com/LSI/

R1210Nxx1x Series

PWM Step-up DC/DC Converter

Outline

The R1210Nxx1x Series are CMOS-based PWM step-up DC/DC Converter, with high accuracy, low supply current.

Each of the R1210Nxx1x Series consists of an oscillator, a PWM circuit, a reference voltage unit, an error amplifier, phase compensation circuit, resistors for voltage detection, a chip enable circuit. Further, includes a controller against drastic load transient, a control transistor with low ON-Resistance, ‘LX switch’, and a protection circuit for LX switch and an output voltage detector. R1210Nxx1A Series contain further a circuit for changeover oscillator frequency each. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with only three external components, or an inductor, a diode and a capacitor.

The R1210N Series can detect drastic change of output voltage with a circuit controller. The load transient response is improved compared with current model, furthermore the R1210Nxx1A Series have another function, that is, when the load current is small, oscillator frequency is decreased by a circuit for switching oscillator frequency from Typ. 100kHz to 35kHz, therefore, supply current is reduced.

The built-in chip enable circuit can make the standby mode with ultra low quiescent current. Since the package for these ICs is small SOT-23-5, high density mounting of the ICs on board is possible.

To Top

Features

External Components

Only an inductor, a diode, and a capacitor

Standby Current

MAX. 0.5μA

Low Temperature-Drift Coefficient
of Output Voltage

TYP. ±100ppm/°C

Output Voltage

Stepwise Setting with a step 0.1V in the range of 2.2V to 6.0V(xx1C/D, xx2C/D) 2.2V to 3.5V(xx1A)

Two choices of Basic Oscillator Frequency

100kHz(xx1A/C), 180kHz(xx1D)

Output Voltage Accuracy

±2.5%

Small Package

SOT-23-5 (Mini-mold)

High Efficiency

TYP. 88%(VIN: Set Output Voltage x 0.6[V], IOUT=10mA)

Low Ripple, Low Noise

Built-in a driver transistor with low on-resistance

Start-up Voltage

MAX. 0.9V

Basic Frequency change-over circuit (only for xx1A type)

from TYP. 100kHz to 35kHz

To Top

Applications

	Power source for battery-powered equipment.
•	Power source for portable communication appliances, cameras, VCRs.
•	Power source for appliances which require higher voltage than battery voltage.