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The R1206N071B is PWM control type step-up DC/DC converter IC with low supply current.
The R1206N071B is fully dedicated to drive White LEDs with constant current. Each of these ICs consists of an NMOS FET, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), and an over-voltage protection circuit (OVP).
The R1206N071B can drive white LEDs in constant current with high efficiency by using an inductor, a diode, a resistor and capacitors as external components.
The LEDs current can be set by an external resistance value and can adjust the dimming of LEDs by CE pin according to the signal of PWM. Feedback voltage is 0.2V, therefore power loss by current setting resistance is small and efficiency is good. Maximum duty cycle is internally fixed, Typ. 91%. LEDs can be driven from low voltage. Protection circuits are the current limit of Lx peak current, the over voltage limit of output, and the under voltage lockout function.
It is controllable the dimming of LEDs quickly when the PWM signal (between 200Hz to 300kHz) input to CE pin. If the CE pin input is "L" in the fixed time (Typ. 0.5ms), the IC becomes the standby mode and turns OFF LEDs.

Supply Current
Typ. 500µA
Standby Current Max. 5µA
Input Voltage Range 1.8V to 5.5V
Feedback Voltage 0.2V
Feedback Voltage Accuracy ±1.0% (±10mV)
Temperature-Drift Coefficient of Feedback Voltage ±150ppm/°C
Oscillator Frequency Typ. 1.2MHz
Maximum Duty Cycle Typ. 91%
Switch ON Resistance Typ. 1.35Ω
UVLO Detector Threshold Typ. 1.6V
Lx Current Limit Protection Typ. 700mA
OVP Detector Threshold Typ. 29.5V
Switching Control PWM
LED dimming control by external PWM signal (Frequency 200Hz to 300kHz)
Packages SOT-23-6
Ceramic capacitors are recommended 0.22µF
  • White LED Backlight for portable equipment

Data Sheet Flyer Design Guide
R1206N071B R1203x / R1206N Series R1206N Series
Package Info. Mark Info. Quality Assurance Data
SOT-23-6 R1206N Reliability

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