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R1275 Series
2A 30V Input Forced PWM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The R1275 is a 36-V synchronous step-down DC/DC converter with built-in drivers. It is designed for industrial equipment, OA equipment and home electronics that require a 24-V input.
It operates at a 2-MHz switching frequency, which allows to use a small inductor to ensure a high transient response and to maintain a high efficiency at heavy load condition. Using a spread spectrum clock generator, the EMI noise can be reduced.
Under cranking condition, the switching frequency is automatically reduced to keep output voltage level constant.

  • Provides a high switching frequency at 2 MHz with an efficiency of 87%.
  • Maintains the output voltage constant by reducing a switching frequency to the minimum 1/4 when an input-output voltage difference is small.
  • Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +8%).

FEATURES

  Consumer Industrial Automotive
Operating Voltage (Maximum Rating) 3.6 V to 30 V (36 V)
Operating Temperature Range -40°C to 105°C -40°C to 125°C
Start-up Voltage 4.5 V
Output Voltage Range 3.3 V to 5.0 V
Feedback Voltage 0.64 V ±1.0%
Adjustable Oscillator Frequency Using External Resistors 2 MHz
External Synchronous Clock Frequency 1.8 MHz to 2.2 MHz
Spread Spectrum Clock Generator (SSCG) Diffusion Rate: Typ. +8%
Minimum On Time Typ. 70 ns
Minimum Off Time Typ. 120 ns
Duty-over Min. 1/4
Soft-start Typ. 0.5 ms or more
Functions Thermal Shutdown Tj = 160°C
Undervoltage Lockout (UVLO) VCC = 3.3 V (Typ.)
Overvoltage Lockout (OVLO) VIN = 35 V (Typ.)
Overvoltage Detection (OVD) FB Pin Voltage (VFB) +10%
LX Current Limiting Typ. 3 A
Overcurrent Protection Hiccup-type
Built-in Driver On Resistance High-side Typ. 0.110 Ω
Low-side Typ. 0.045 Ω
Package HSOP-18

APPLICATION INFORMATION

*1) Connecting a Schottky barrier diode between LX and GND can reduce the LX noise and improve the efficiency.

TYPICAL CHARACTERISTICS

Efficiency (VOUT = 5 V)

PIN DESCRIPTION

HSOP-18

HSOP-185.2 mm × 6.2 mm
1 VIN**
2 VIN**
3 NC
4 CE
5 CSS
6 COMP
7 FB
8 PGOOD
9 VOUT
10 MODE***
11 RT
12 VCC
13 BST
14 GND**
15 GND**
16 GND**
17 NC
18 LX

*) The tab is substrate level (GND).
**) The pins with the same name should be connected together.
***) This pin should be used with High or with external clock input.


R1275 Series for Consumer

APPLICATIONS

  • Digital Electronics: Digital TVs, DVD Players
  • OA Equipment: Printers, Facsimiles
  • Portable Communication Equipment, Cameras, Video Cameras
  • Battery-powered Equipment

PRODUCT LONGEVITY PROGRAM

R1275 series for consumer operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


Operating Temperature Range : -40°C to 105°C


SELECTION GUIDE

Product Name   Package Quantity per Reel
R1275S003#-E2-FE ConsumerPLP HSOP-18 1,000
  • # … Choose the optional functions
    A: Disable SSCG
    C: Enable SSCG

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
HSOP-18 R1275S R1275S

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.


R1275 Series for Industrial

This product is a high-reliability semiconductor device for industrial application that has passed both the screening at high temperature and the reliability test with extended hours. Ricoh accommodates requests including the long-time operation and high temperature environment use.


APPLICATIONS

  • Industrial equipments such as FAs and smart meters
  • Equipments used under high-temperature conditions such as surveillance camera and vending machine.
  • Equipments accompanied by self-heating such as motor and lighting.

Operating Temperature Range : -40°C to 105°C


SELECTION GUIDE

Product Name   Package Quantity per Reel
R1275S003#-E2-YE Industrial HSOP-18 1,000
  • # … Choose the optional functions
    A: Disable SSCG
    C: Enable SSCG

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
HSOP-18 R1275S (-YE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.


R1275 Series for Automotive

Ricoh is committed to providing a semiconductor device with the highest level of quality and reliability by restricting the device manufacturing only within Ricoh and the cooperative companies successfully passed our stringent inspections for automotive products. Ricoh established a traceability system and manages manufacturing information and logistics information from the warehouse.


Quality Ranks for Applications

Ricoh offers three different quality ranks for automotive products according to their application purposes.
R1275 Series offer products in Rank 3.

Rank 3: Automotive Accessories

  • Power source for car accessories such as car audio equipment, car navigation system, and ETC system

PRODUCT LONGEVITY PROGRAM

R1275 series for automotive operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


Operating Temperature Range : -40°C to 125°C


Tjmax 150°C

Unlike the rating of the products for consumer and industrial applications at Tjmax = 125°C, the products for automotive applications are rated at high temperature of Tjmax = 150°C. The power dissipation is also rated at high temperature.


SELECTION GUIDE

Product Name   Package Quantity per Reel
R1275S003#-E2-AE AutomotiveAutomotive AccessoriesPLP HSOP-18 1,000
  • # … Choose the optional functions
    A: Disable SSCG
    C: Enable SSCG

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
HSOP-18 R1275S (-AE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

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