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R1211 Series

PWM Step-up DC/DC Controller

  • Consumer
  • Automotive
  • PLP
  • RoHS

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.

Specs & Datasheets

  Consumer Automotive
Input Voltage Range 2.5 V to 6 V (6.5 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 600 µA
Standby Current Typ. 0 µA
Output Voltage Temperature Coefficient Typ. ±150ppm/°C
Feedback Voltage 1.0 V
Feedback Voltage Accuracy ±1.5%
Oscillator Frequency Typ. 300 kHz, Typ. 700 kHz
Maximum Duty Cycle Typ. 90%
Package SON-6, SOT-23-6W SOT-23-6W

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

R1211x002A/C Typical Application

R1211x002A/C Typical Application

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

R1211x002B/D Typical Application

R1211x002B/D Typical Application

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

R1211x002A Efficiency vs. Output Current

R1211x002A Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
SON-6 R1211D R1211D-FE
  • gradeConsumerC
  • plpP
SOT-23-6W R1211N R1211N-FE
  • gradeAutomotiveA
  • plpP
SOT-23-6W R1211N R1211N-AE

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

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