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R1211 Series
PWM Step-up DCDC Controller

Product Specifications

The R1211 Series are low supply current CMOS-based PWM step-up DC/DC controllers. R1211 does not include an internal output transistor. By simply using a power MOS, an inductor, a diode, resistors, and capacitors as external components, a high-efficiency step-up DC/DC converter can be easily configured. R1211 is available in two versions: B/D versions with an internal phase compensation and A/C versions with adjustable phase compensation with an external capacitor and resistor.

The oscillator frequency can be selected from 300kHz or 700kHz. The soft start function built into the controller is set to Typ. 10.5ms for 300kHz and to Typ. 9ms for 700kHz. The latch type protection circuit embedded into the device latches the external driver in the "OFF" state when the oscillator maximum duty cycle continues for a predetermined period of time setting by an external capacitor.

FEATURES

  Consumer Automotive
Input Voltage Range (Maximum Rating) 2.5 V to 6.0 V (6.5 V)
Operating Temperature Range −40°C to 85°C
Standby Current Typ. 0 µA
Oscillator Frequency (PWM control) 300 kHz, 700 kHz
Maximum Duty Cycle Typ. 90%
Feedback Voltage 1.0 V
Feedback Voltage Accuracy ±1.5%
UVLO Threshold level Typ. 2.2 V (Hysteresis Typ. 0.13 V)
Feedback Voltage Temperature Coefficient Typ. ±150 ppm/°C
Built-in Latch-type Protection Circuit Protection Delay Time can be set with an external capacitor
Packages SON-6, SOT-23-6W SOT-23-6W

APPLICATION INFORMATION

R1211x002A/C

L: 10µH (002A), 22µH (002C)
C1: 4.7µF, C2: 0.22µF, C3: 10µF, C4: 680pF, C5: 2200pF
R3: 30kΩ, R4: 30kΩ

R1211x002B/D

L: 10µH (002B), 22µH (002D)
C1: 4.7µF, C2: 0.22µF, C3: 10µF, C4: 680pF
R3: 30kΩ

TYPICAL CHARACTERISTICS

R1211x002A Efficiency vs. Output Current

PIN DESCRIPTION

SON-6

SON-61.6 mm × 3.0 mm
1 DELAY
2 GND
3 EXT
4 VIN
5 VFB
6 AMPOUT or CE

*) The tab suspension leads on back side are substrate level (GND).

SOT-23-6W

SOT-23-6W2.9 mm × 2.8 mm
1 DELAY
2 AMPOUT or CE
3 VFB
4 VIN
5 GND
6 EXT

R1211 Series for Consumer

APPLICATIONS

  • Constant Voltage Power Source for Portable Equipment
  • Constant Voltage Power Source for LCD and CCD

PRODUCT LONGEVITY PROGRAM

R1211N operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

In the R1211, the oscillator frequency, the optional function, and the package type are user-selectable options.

Product Name   Package Quantity per Reel
R1211D002$-TR-FE Consumter SON-6 3,000
R1211N002$-TR-FE ConsumterPLP SOT-23-6W 3,000
  • $ … Designation of Oscillator Frequency and Optional Function
    A: 700 kHz, with AMPOUT pin (External Phase Compensation Type)
    B: 700 kHz, with CE pin (Internal Phase Compensation Type, with Standby)
    C: 300 kHz, with AMPOUT pin (External Phase Compensation Type)
    D: 300 kHz, with CE pin (Internal Phase Compensation Type, with Standby)

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
SON-6 R1211D R1211D (-FE)
SOT-23-6W R1211N R1211N (-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.


R1211 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.
R1211 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

R1211N operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

In the R1211, the oscillator frequency, the optional function, and the package type for the ICs can be selected at the user's request.

Product Name   Package Quantity per Reel
R1211N002$-TR-AE AutomotiveAutomotive AccessoriesPLP SOT-23-6W 3,000
  • $ … Designation of Oscillator Frequency and Optional Function
    B: 700kHz, with CE pin (Internal Phase Compensation Type, with Stand-by)
    D: 300kHz, with CE pin (Internal Phase Compensation Type, with Stand-by)

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
SOT-23-6W R1211N (-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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