1.2A* 30V Input PWM Step-down DC/DC Converter
The R1244N Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 1.2A* output current. R1244N include a fold-back protection circuit. By simply using an inductor, resistors, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1244N provide a fast response and high efficiency. Ceramic output capacitors can be used. Two different pin layout of SOT-23-6W package as R1240N and R1244N are available.
|Supply Current (IDD)
||Typ. 500µA (No switching)
|Standby Current (Istandby)
||Max. 5µA (CE="L")
|Input Voltage Range (VIN)
||4.5V to 30.0V
|Output Voltage Range (VOUT)
||0.8V to 15.0V (Externally adjustable)
Feedback voltage : 0.8V)
|Feedback Voltage Accuracy
|Output Current (IOUT)
|Oscillator Frequency (fosc)
|Oscillator Maximum Duty Cycle (Maxduty)
||R1240x : Min. 75%, Typ. 85%
R1244N : Typ. 85%
|Minimum ON Time (tMIN)
|UVLO Detect Voltage (VUVLO)
|Soft Start Time (tstart)
|High Side Switch Limit Current
|Thermal Shutdown Circuit
||Stops at 160°C.
|Fold-back Protection Circuit
Typ. 310kHz (B Version)
*)This is an approximate value, because output current depending on conditions and external parts.
- •Power source for digital home appliances such as digital TVs and DVD players
- •Power source for office automation equipment such as printers and fax machines
- •Power source for hand-held communication equipment, cameras, and VCRs
- •Power source for battery-powered equipment
|Data Sheet||Flyer||Package Info.||Mark Info.||Quality Assurance Data|
|to be prepared|
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