STEP-UP DC/DC CONVERTER
The R1207N Series are CMOS-based PWM control type step-up DC/DC converter ICs with low supply current.
Each of these ICs consists of an NMOS FET, a diode, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), an over-voltage protection circuit (OVP), a soft-start circuit, a Maxduty limit circuit, and a thermal shutdown protection circuit. This step-up DC/DC converter can be easily built with a few external components such as a coil, a resistor, and a capacitor.
As the protection functions, the R1207N Series have a Lx peak current limit function, an over voltage protection (OVP) function, an under voltage lock out (UVLO) function and a thermal shutdown function.
The R1207N Series present the R1207N8xxA version that is optimized for the constant voltage power source, and the R1207N8xxB version that is optimized for driving the white LED with the constant current. The R1207N8xxB is an adjustable version that can change the LED brightness dynamically by using a 200Hz to 300kHz PWM signal toward the CE pin.
The R1207N Series are available in TSOT-23-6 package.
|Input Voltage Range
||2.3V to 5.5V (R1207N8xxA)
1.8V to 5.5V (R1207N8xxB)
|Supply Current||Typ. 800μA|
|Standby Current||Max. 5μA|
|Feedback Voltage||1.0V±1.5% (R1207N8xxA)
|Oscillator Frequency||Typ. 1.2MHz|
|Maximum Duty Cycle||Typ. 91%|
|UVLO Function||Typ.2.0V (Hys.Typ.0.2V) (R1207N8xxA)
Typ.1.6V (Hys.Typ.0.1V) (R1207N8xxB)
|Lx Current Limit Function||Select from 350mA, 700mA|
|Over Voltage Protection||Typ. 25V|
|LED dimming control (R1207N8xxB)||by external PWM signal (Frequency 200Hz to 300kHz)|
|Thermal Protection Function||Typ. 150°C(Hys.Typ.50ºC)|
|Switch ON Resistance||Typ. 1.35Ω|
|Ceramic capacitors are recommended|
- ・Constant Voltage Power Source for portable equipment
- ・OLED power supply for portable equipment
- ・White LED Backlight for portable equipment
|Data Sheet||Flyer||Design Guide|
|Package Info.||Mark Info.||Quality Assurance Data|
|to be prepared||to be prepared|
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