Skip to main content Skip to first level navigation
Skip to main content First level navigation Menu
Contact Us About Us ricoh.com
Breadcrumbs
Facebook (Open link in new window) YouTube (Open link in new window) LinkedIn (Open link in new window)
Main content
Main content

R1240 Series

1.2A 30V Input PWM Step-down DC/DC Converter

  • Consumer
  • RoHS

The R1240 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 1.2A* output current. R1240 include a soft start circuit and a latch or a fold-back protection circuit. By simply using an inductor, resistors, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1240 provide a fast response and high efficiency.

*) This is an approximate value, because output current depending on conditions and external parts.

Specs & Datasheets

  Consumer
Input Voltage Range 4.5 V to 30.0 V (32.0 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 500 µA
Standby Current Typ. 0 µA
Output Voltage Range Externally Adjustable: 0.8 V to 15.0 V
Feedback Voltage 0.8 V
Feedback Voltage Accuracy ±12 mV
Output Current 1.2 A
Oscillator Frequency Typ. 1.25 MHz
Maximum Duty Cycle Min. 75%, Typ. 85%
Package SOT-23-6W, DFN(PLP)2527-10

Download Datasheet

Protections / Functions

Functional Description

TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
                       

Technical Documents

Download Circuit Module

    ZUKEN Link Module Station

R1240x Typical Application

R1240x Typical Application

(VOUT=3.3V)

R1240x Efficiency vs. Output Current

R1240x Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
R1240K003x-TR
  • gradeConsumerC
DFN(PLP)2527-10 R1240K R1240K
R1240N001x-TR-FE
  • gradeConsumerC
SOT-23-6W R1240N R1240N-FE

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

TSD Thermal Shutdown Function
ILX LX Current Limit Function
OCP Overcurrent Protection
OVP Overvoltage Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Reverse Reverse Current Protection Circuit
Shutdown Shutdown Function
Soft Start Soft Start Function
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Function
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty Maximum Duty Cycle
Ext. Phase Externally Adjustable Phase Compensation
LED Adjust LED High-speed Dimming Control

Search for similar products under conditions below.

Category:DC/DC Switching Regulators

Topology Buck
VIN
min (V)
4.5
VIN
max (V)
30.0
VOUT
min (V)
0.8
VOUT
max (V)
15.0
IOUT
(mA)
1200
ISS
(µA)
500