Skip to main content Skip to first level navigation

RICOH imagine. change.

RICOH ELECTRONIC DEVICES CO., LTD.

Skip to main content First level navigation Menu
Main content

R1272 Series
34V Input PWM/VFM Step-down DCDC Controller with PLL Synchronization

Product Specifications

The R1272 is a step-down DC/DC controller with synchronous rectifier and 34V input voltage. By the adoption of a unique current mode PWM architecture without an external current sense resistor, the R1272 can make up a stable DC/DC converter with high-efficiency even if adding low Ron MOSFETs and a low DCR inductor externally. In PLL_PWM mode, oscillator frequency is synchronized to an external clock frequency using a PLL and is effective for EMI control. For EMI reduction, SSCG (Spread-Spectrum Clock Generation) for diffused oscillation frequency at the PWM operation is optionally available.

FEATURES

  Consumer Industrial Automotive
Operating Voltage (Maximum Rating) 4.0 V to 34 V (36 V)
Operating Temperature Range -40°C to 105°C -40°C to 125°C
Start-up Voltage 4.5 V
Output Voltage 0.7 V to 5.3 V
Feedback Voltage Tolerance 0.64 V ±1%
Consumption Current at No Load (at VFM mode) Typ. 15 µA
Adjustable Oscillation Frequency*1 250 kHz to 1 MHz
Synchronizable Clock Frequency*1 250 kHz to 1 MHz
Spreading Rate for SSCG Typ. ±3.6%
Minimum On-Time Typ. 100 ns
Minimum Off-Time Typ.120 ns (at regulation mode)
At dropout, actual minimum off-time is reduced.
Adjustable Soft-start Time*2 Typ. 500 µs
Functions Pre-bias Start-up
Anti-phase Clock Output
Thermal Shutdown Function Tj = 160°C (Typ.)
Under Voltage Lockout (UVLO) Function Typ. 3.3 V
Over Voltage Detection (OVD) Function FB pin voltage (VFB) + 10% (Typ.)
Detection/Release Hysteresis: FB pin voltage (VFB) x 3% (Typ.)
Under Voltage Detection (UVD) Function FB pin voltage (VFB) - 10% (Typ.)
Detection/Release Hysteresis: FB pin voltage (VFB) x 3% (Typ.)
Over-current Protection Hiccup-mode / Latch mode
Selectable Current Limit Threshold 50 mV / 70 mV / 100 mV
Power Good Output NMOS Open-drain Output
Package HSOP-18

*1 The adjustable oscillation frequency range becomes 250 kHz ≤ fOSC ≤ 600 kHz when 0.7 V ≤ VOUT < 1.35V.
*2 500 µs(Typ.) as a lower limit with using an external capacitor. Otherwise, available the tracking function through the application of an external voltage.

APPLICATION INFORMATION

at 1MHz

TYPICAL CHARACTERISTICS

R1272S Efficiency vs. Output Current

PIN DESCRIPTION

HSOP-18

HSOP-185.2 mm × 6.2 mm
1 VIN
2 CSS/TRK
3 AGND
4 CE
5 SENSE
6 VOUT
7 RT
8 COMP
9 FB
10 CLKOUT
11 PGOOD
12 MODE
13 PGND
14 LGATE
15 LX
16 HGATE
17 BST
18 VCC

*) The tab is substrate level (GND).


R1272 Series for Consumer

APPLICATIONS

  • Power source for portable equipment such as PDA, DSC, Notebook PC.
  • Power source for office equipment such as printers and fax machines
  • Power source for 5V PSU or 2-cell or more Li-ion battery powered communication equipment, cameras, video instruments such as VCRs, camcorders
  • Power source for high voltage battery-powered equipment

PRODUCT LONGEVITY PROGRAM

R1272 series 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

The function and setting for the ICs are selectable at the user’s request.

Product Name   Package Quantity per Reel
R1272SxxyA-E2-FE ConsumerPLP HSOP-18 1,000
  • xx … Select the combination of processing and function.
    00: Non-latch type hiccup mode, Disable SSCG
    01: Latch mode, Disable SSCG
    03: Latch mode, Enable SSCG
    If required a version with SSCG function, please contact our sales offices.
  • y … Select the current limit threshold voltage.
    1: 50 mV (Typ.)
    2: 70 mV (Typ.)
    3: 100 mV (Typ.)

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
HSOP-18 R1272S R1272S (-FE)

*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.


R1272 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.

PRODUCT LONGEVITY PROGRAM

R1272 series 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

The function and setting for the ICs are selectable at the user’s request.

Product Name   Package Quantity per Reel
R1272SxxyA-E2-YE IndustrialPLP HSOP-18 1,000
  • xx … Select the combination of processing and function.
    00: Non-latch type hiccup mode, Disable SSCG
    01: Latch mode, Disable SSCG
    03: Latch mode, Enable SSCG
    If required a version with SSCG function, please contact our sales offices.
  • y … Select the current limit threshold voltage.
    1: 50 mV (Typ.)
    2: 70 mV (Typ.)
    3: 100 mV (Typ.)

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
HSOP-18 R1272S (-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.


R1272 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.
R1272 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


PRODUCT LONGEVITY PROGRAM

R1272 series 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

The function and setting for the ICs are selectable at the user’s request.

Product Name   Package Quantity per Reel
R1272SxxyA-E2-KE AutomotiveAutomotive General EquipmentsAEC-Q100PLP HSOP-18 1,000
R1272SxxyA-E2-AE AutomotiveAutomotive AccessoriesAEC-Q100PLP
  • xx … Select the combination of processing and function.
    00: Non-latch type hiccup mode, Disable SSCG
    01: Latch mode, Disable SSCG
    03: Latch mode, Enable SSCG
    If required a version with SSCG function, please contact our sales offices.
  • y … Select the current limit threshold voltage.
    1: 50 mV (Typ.)
    2: 70 mV (Typ.)
    3: 100 mV (Typ.)

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
HSOP-18 R1272S (-KE)*3
R1272S (-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.

Inquiry about products

Technical Support

Inquiries (SSL Form)

Inquiry about business

Purchase, Request for Samples and Documents

Distributors

Sample Online

Online Distributors