PWM Step-up DC/DC Controller - NO.EA-064-111123 - R1210Nxx2x Series Features & Specifications

Oct 12, 2026

PWM step-up DC/DC converter controller overview for the R1210Nxx2C/xx2D CMOS series, highlighting high accuracy and low supply current. Describes internal blocks and how only four external parts can form a low-ripple, high-efficiency step-up circuit. Covers output-voltage stepwise setting (2.2V–6.0V), two oscillator frequency choices, standby current, temperature-drift coefficient, and EXT pin use for external transistor drive. Includes selection guidance, SOT-23-5 pinout, absolute maximum ratings, and electrical characteristics across operating conditions.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages20

Reading Time50 min

AccessFree to download

Overview

Key IC Functions

Features

Applications

Selection Guide

Pin Configuration

Pin Descriptions

Absolute Maximum Ratings

Electrical Characteristics

PWM Step-up DC/DC Controller NO.EA-064-111123 OUTLINE The R1210Nxx2C/xx2D Series are CMOS-based PWM step-up DC/DC Converter controllers, with high accuracy, low supply current. Each of the R1210Nxx2x 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, a controller against drastic load transient and an output voltage detector. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with only four external components, or an inductor, a diode, a transistor and a capacitor. The R1210Nxx2x Series can detect drastic change of output voltage with a circuit controller, the load transient response is improved. Each of the R1210Nxx2x Series has a driver pin, or ‘ EXT’ pin for external transistor. By connecting a power transistor with low ON-resistance to EXT pin, a large current flows through an inductor, thus, large output current can be supplied. 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. FEATURES • External Components ....................................... Only an inductor, a diode, a capacitor, and a transistor • Standby Current ................................................ Max. 0.5μA • Low Temperature-Drift Coefficient of Output Voltage Typ. ± 100ppm/°C • Output Voltage .................................................. Stepwise Setting with a step of 0. 1V in the range of 2.2V to 6.0V • Two choices of Basic Oscillator Frequency 100kHz (xx2C), 180kHz (xx2D) • Output Voltage Accuracy...................................±2.5% • Small Package .................................................. SOT-23-5 • Low Ripple, Low Noise • Oscillator Start-up Voltage ................................ Max. 0.8V APPLICATIONS • Power source for battery-powered equipment. • Power source for portable communication appliances, cameras, VCRs • Power source for appliances of which require higher voltage than battery voltage. R1210Nxx2x BLOCK DIAGRAMS SELECTION GUIDE In the R1210N Series, the output voltage, the oscillator frequency for the ICs can be selected at the user’s request. The selection can be made by designating the part number as shown below; | Product Name | Package | Quantity per Reel | | Pb Free | Halogen Free | | --- | --- | --- | --- | --- | --- | | R1210Nxx2∗-TR-FE | SOT-23-5 | 3,000 pcs | Yes | | Yes | | xx : Setting Output Voltage(VOUT)
Stepwise setting with a step of 0. 1V in the range of 2.2V（22）to 6.0V（60） | | | | | | | ∗ : Designation of Oscillator Frequency
C： 100kHz
D： 180kHz | | | | | | 2 R1210Nxx2x PIN CONFIGURATION SOT-23-5 5 4 1 2 3 PIN DESCRIPTIONS | Pin No | Symbol | Pin Description | | --- | --- | --- | | 1 | CE | Chip Enable Pin | | 2 | VOUT | Pin for Output Voltage | | 3 | NC | No Connection | | 4 | GND | Ground Pin | | 5 | EXT | External Transistor Drive Pin | ABSOLUTE MAXIMUM RATINGS | Symbol | Item | Rating | Unit | | --- | --- | --- | --- | | VOUT | VOUT Pin Output Voltage | -0.3 to 9.0 | V | | VEXT | EXT Pin Output Voltage | -0.3 to VOUT+0.3 | V | | VCE | CE Pin Input Voltage | -0.3 to 9.0 | V | | IEXT | EXT Pin Output Current | ±40 | mA | | PD | Power Dissipation | 420 | mW | | Topt | Operating Temperature Range | −40 to +85 | °C | | Tstg | Storage Temperature Range | −55 to + 125 | °C | *1) For Power Dissipation, please refer to PACKAGE INFORMATION. |
ABSOLUTE MAXIMUM RATINGS | | --- | | Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field.
The functional operation at or over these absolute maximum ratings is not assured. | 3 R1210Nxx2x ELECTRI

FAQs

What external components are needed to build a step-up DC/DC converter using the R1210Nxx2x series?

A low-ripple, high-efficiency step-up converter can be composed with only four external components: an inductor, a diode, a transistor, and a capacitor.

How is the output voltage set for the R1210Nxx2x controllers?

Output voltage is selectable stepwise with a 0.1V step in the range of 2.2V to 6.0V, determined by the part number designation.

What is the role of the EXT pin in the R1210Nxx2x series?

The EXT pin provides an external transistor drive path; by connecting a power transistor with low ON-resistance to EXT, a larger inductor current flows, enabling higher output current.

Oct 12, 2026

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