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R1276 Series
3A 30V Input Step-down DC/DC Converter with Synchronous Rectifier

Product Specifications

The R1276 is a 36-V rated synchronous step-down DC/DC converter with built-in transistor. Under cranking condition, the switching frequency is automatically reduced to keep output voltage level constant.

  • High efficiency of 95%
  • Maintains the output voltage constant at cranking by reducing a switching frequency to the minimum 1/4.
  • Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +10%).

FEATURES

  Consumer Industrial Automotive
Input Voltage Range (Maximum Rating) 3.6 V to 30 V (36 V)
Operating Temperature Range -40°C to 105°C -40°C to 125°C
Standby Current Typ. 4 µA
Start-up Voltage 4.5 V
Output Voltage Range 0.7 V to 6.5 V
Feedback Voltage 0.64 V ±1.0%
Consumption Current at No Load (at VFM mode) Typ. 12 µA
Adjustable Oscillator Frequency Using External Resistors
250 kHz to 1 MHz*1
External Synchronous Clock Frequency 250 kHz to 1 MHz
Spread Spectrum Clock Generator (SSCG) Diffusion Rate: Typ. +10%
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. 4.2 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

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/TRK
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 on the bottom of the package is substrate level (GND). The tab must be connected to the ground plane on the board.
**) The pins with the same name should be connected together.


R1276 Series for Consumer

APPLICATIONS

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

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


SELECTION GUIDE

Product Name   Package Quantity per Reel
R1276Sxxx#-E2-FE Consumer HSOP-18 1,000
  • xxx … Select an output voltage range from below.
xxx Output voltage range
001 3.15 V < VOUT ≤ 6.0 V
002 6.0 V < VOUT ≤ 6.5 V
004 0.7 V ≤ VOUT ≤ 3.15 V
  • # … Choose the optional functions
    A: Disable SSCG
    C: Enable SSCG

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
HSOP-18 R1276S R1276S

*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.


R1276 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 125°C


Tjmax 150°C

Unlike the rating of the products for consumer 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
R1276Sxxx#-E2-YE Industrial HSOP-18 1,000
  • xxx … Select an output voltage range from below.
xxx Output voltage range
001 3.15 V < VOUT ≤ 6.0 V
002 6.0 V < VOUT ≤ 6.5 V
004 0.7 V ≤ VOUT ≤ 3.15 V
  • # … Choose the optional functions
    A: Disable SSCG
    C: Enable SSCG

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Marking Reliability*2
HSOP-18 R1276S R1276S (-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.


R1276 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.
R1276 Series offer products in Rank 2 and Rank 3.

Rank 2: Automotive General Equipments (Body System)

  • Power source for automotive general equipments such as electric window, side mirror, and around view camera

Rank 3: Automotive Accessories

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

AEC-Q100 Grade 1 Compliant


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


Tjmax 150°C

Unlike the rating of the products for consumer 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
R1276Sxxx#-E2-KE 車載車載アクセサリAEC-Q100 HSOP-18 1,000
R1276Sxxx#-E2-AE AutomotiveAutomotive AccessoriesAEC-Q100
  • xxx … Select an output voltage range from below.
xxx Output voltage range
001 3.15 V < VOUT ≤ 6.0 V
002 6.0 V < VOUT ≤ 6.5 V
004 0.7 V ≤ VOUT ≤ 3.15 V
  • # … Choose the optional functions
    A: Disable SSCG
    C: Enable SSCG

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Marking Reliability*2
HSOP-18 R1276S R1276S (-KE)*3
R1276S (-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.
*3: The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.

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