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Step-down DC/DC Converter

Lineup in order of Input Voltage and Function
Step-up
Step-down
Multi Power Supply
For LCD/OLED/CCD

High voltage Step-down DC/DC Converters Lineup

These products are high voltage step-down DC/DC converters. These products include an under-voltage lockout circuit (UVLO), a soft-start circuit and a thermal shutdown circuit.
The products highlighted in purple rows are major products that are shown in the "DC/DC Converters Lineup in order of Input Voltage and Function".
For technical terms on the list, please refer to "Application Note".

Product Name	Version	Control	Input Voltage Range	Output Voltage Range	VFB Voltage Accuracy	Frequency	Output Current ^*1	Protection Circuit	Rectifier	Package	Data Sheet (PDF)	Design Guide (PDF)
R1240x	00xA	PWM	4.5V to 30.0V	Ext. adjustable between 0.8V and 15.0V	±12mV	1.25MHz	1.2A	Latch type	Diode Rectifier	SOT-23-6W^*3 DFN(PLP)2527-10
R1240x	00xB	PWM	4.5V to 30.0V	Ext. adjustable between 0.8V and 15.0V	±12mV	1.25MHz	1.2A	Fold-back type^*2	Diode Rectifier	SOT-23-6W^*3 DFN(PLP)2527-10
R1244N	001B	PWM	4.5V to 30.0V	Ext. adjustable between 0.8V and 15.0V	±12mV	1.25MHz	1.2A	Fold-back type^*2	Diode Rectifier	SOT-23-6W^*3	-	-
R1245x	00xA/C/E/G	PWM	4.5V to 30.0V	Ext. adjustable between 0.8V and 27.6V (A to D)	±8mV	330kHz(A/B) 500kHz(C/D) 1MHz(E/F) 2.4MHz(G/H)	1.2A	Latch type	Diode Rectifier	DFN(PLP)2020-8 SOT-23-6W HSOP-8E		-
R1245x	00xB/D/F/H	PWM	4.5V to 30.0V	Ext. adjustable between 0.8V and 27.6V (A to D)	±8mV	330kHz(A/B) 500kHz(C/D) 1MHz(E/F) 2.4MHz(G/H)	1.2A	Fold-back type^*2	Diode Rectifier	DFN(PLP)2020-8 SOT-23-6W HSOP-8E		-
R1243x	001A/C	PWM	4.5V to 30.0V	Ext. adjustable between 0.8V and 18.0V	±7mV	330kHz(C/D) 1MHz(A/B)	2A	Latch type	Diode Rectifier	DFN(PLP)2527-10 HSOP-8E		-
R1243x	001B/D	PWM	4.5V to 30.0V	Ext. adjustable between 0.8V and 18.0V	±7mV	330kHz(C/D) 1MHz(A/B)	2A	Fold-back type^*2	Diode Rectifier	DFN(PLP)2527-10 HSOP-8E		-
R1242S	001A/C/E/G	PWM	5.0V to 30.0V	Ext. adjustable between 0.8V and 15.0V	±12mV	330kHz(C/D) 500kHz(E/F) 1MHz(G/H) Ext. adjustable between 330kHz to 1MHz(A/B)	3A	Latch type	Synchronous Rectifier (with external low side transistor)	HSOP-8E
R1242S	001B/D/F/H	PWM	5.0V to 30.0V	Ext. adjustable between 0.8V and 15.0V	±12mV		3A	Fold-back type^*2	Synchronous Rectifier (with external low side transistor)	HSOP-8E

*1This is an approximate value, because output current depends on conditions and external parts.
*2The pin-layout of R1240N and that of R1244N is upside down.