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R1201 Series
PWM Step-up DCDC Converter for White LED

Product Specifications

The R1201 Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs with constant current. R1201 includes a diode, an under-voltage lockout circuit (UVLO), and over-voltage protection circuit (OVP). By simply using an inductor, a resistor, and capacitors as external components, white LEDs can be driven with constant current and high efficiency. A diode is built-in; therefore it is possible to drive up to 5 serial LEDs without an external diode. The oscillator frequency can be selected from 1MHz or 1.2MHz. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be adjusted quickly by applying a PWM signal (200Hz to 300kHz) to the CE pin.

FEATURES

Input Voltage Range (Maximum Rating) 1.8 V to 5.5 V (6.5 V) (R1201xxx1A/3A)
1.8 V to 4.5 V (6.5 V) (R1201xxx2A/4A)
Supply Current Typ. 450 µA (R1201xxx3A/4A)
Typ. 500 µA (R1201xxx1A/2A)
Standby Current Typ. 1 µA
Feedback Voltage 0.2 V
Feedback Voltage Accuracy ±10 mV
Temperature-Drift Coefficient of Feedback Voltage ±150 ppm/°C
Oscillator Frequency Typ. 1 MHz, Typ. 1.2 MHz
Maximum Duty Cycle Typ. 91%
Switch ON Resistance Typ. 1.35 Ω
UVLO Detector Threshold Typ. 1.6 V
Lx Current Limit Protection Typ. 700 mA
OVP Detector Threshold Select from 9.5V, 14.0V, 18.5V, 20.6V, 21.6V
Switching Control PWM
LED dimming control by external PWM signal (Frequency 200Hz to 300kHz)
Package SOT-23-6
Ceramic capacitors are recommended 0.22 µF (R1201x02xA/ 03xA/ 04xA)
1 µF (R1201x05xA)

APPLICATION INFORMATION

R1201N05xA

TYPICAL CHARACTERISTICS

R1201N041A Efficiency vs. Output Current

PIN DESCRIPTION

SOT-23-62.9 mm × 2.8 mm

SOT-23-6

1 CE
2 VOUT
3 VIN
4 Lx
5 GND
6 VFB

R1201 Series for Consumer

APPLICATIONS

  • White LED Backlight for portable equipment

SELECTION GUIDE

The OVP threshold voltage, and the package for the ICs can be selected at the user's request.

Product Name   Package Quantity per Reel
R1201NxxxA-TR-FE Consumter SOT-23-6 3,000
  • xxx … Designation of OVP detector threshold
    021: 9.5V threshold of OVP, Frequency 1.2MHz
    031: 14.0V threshold of OVP, Frequency 1.2MHz
    041: 18.5V threshold of OVP, Frequency 1.2MHz
    051: 20.6V threshold of OVP, Frequency 1.2MHz
    052: 21.6V threshold of OVP, Frequency 1.2MHz
    023: 9.5V threshold of OVP, Frequency 1MHz
    033: 14.0V threshold of OVP, Frequency 1MHz
    043: 18.5V threshold of OVP, Frequency 1MHz
    053: 20.6V threshold of OVP, Frequency 1MHz
    054: 21.6V threshold of OVP, Frequency 1MHz

* As for R1201x052A/ 054A version, input voltage range is 1.8V to 4.5V.

DOCUMENT/CONTACT

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Package *1 Marking Reliability *2
SOT-23-6 R1201N R1201N (-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.

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