Global

Step-down DC/DC Converter

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

Low voltage Step-down DC/DC Converters Lineup

These products are low voltage step-down DC/DC converters with a synchronous rectifier. These products include an under-voltage lockout circuit (UVLO), a soft-start circuit and a latch type protection circuit. (RP507K doesn't include a latch type protection circuit.)
The products highlighted in pink 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	MODE pin	Input Voltage Range	Output Voltage Range	Voltage Accuracy ^*1	Frequency	Output Current ^*2	Thermal Shutdown	Auto- Discharge	Package	Data Sheet (PDF)	Design Guide (PDF)
RP500x	xx1A	PWM/VFM Auto Switching	—	2.55V to 5.5V	1.1V to 3.3V	±1.5%	1.2MHz	600mA	-	-	WLCSP-6-P2 DFN1616-6 DFN(PLP)1820-6 SOT-23-6W
	xx2A	PWM								-
	xx3A	PWM/VFM Auto Switching
	xx4A	PWM
RP503x	xx1A	PWM/VFM Auto Switching	—	2.5V to 5.5V	0.8V to 2.5V	±1.5%	2MHz	600mA	—	-	DFN1616-6 SOT-23-5
RP503x	xx2A	PWM/VFM Auto Switching	—	2.5V to 5.5V	0.8V to 2.5V	±1.5%	2MHz	600mA	—		DFN1616-6 SOT-23-5
RP507K	001B	PWM/VFM Auto Switching	—	2.3V to 5.5V	Ext. adjustable between 0.7V to 5.5V	±9mV	2MHz	600mA			DFN(PLP)1616-6D
RP504x	xx1A	Forced PWM, PWM/VFM Auto Switching		2.3V to 5.5V (VOUT ≥1.0V)	0.8V to 3.3V	±1.5%	2.25MHz	600mA	-	-	DFN(PLP)1216-6F DFN1616-6B
	xx1B	PWM/VFM Auto Switching	—								SOT-23-5
	xx1C	Forced PWM	—								SOT-23-5
	xx1D	Forced PWM, PWM/VFM Auto Switching									DFN(PLP)1216-6F DFN1616-6B
RP502x	xx1B	PWM/VFM Auto Switching	—	2.5V to 5.5V	0.8V to 3.3V	±1.5%	3.3MHz	600mA	—	-	WLCSP-6-P2 DFN1616-6	1.19MB
	xx2B	PWM								-
	xx3B	PWM/VFM Auto Switching
	xx4B	PWM
R1232D	xx1A/B	PWM	—	2.6V to 5.5V	0.9V to 3.3V	±2%	1MHz (A/C) 2.25MHz (B/D)	1A	—	-	SON-8	1.30MB	-
R1232D	001C/D	PWM	—	2.6V to 5.5V	Ext. adjustable between 0.8V to VIN	±16mV	1MHz (A/C) 2.25MHz (B/D)	1A	—	-	SON-8	1.30MB	-
RP501K	xx1A	PWM, PWM/VFM Auto Switching		2.5V to 5.5V	1.0V to 3.3V	±1.5%	2.25MHz	1A	—	-	DFN(PLP)2527-10	1.17MB
RP501K	xx1B	PWM, PWM/VFM Auto Switching		2.5V to 5.5V	1.0V to 3.3V	±1.5%	2.25MHz	1A	—		DFN(PLP)2527-10	1.17MB
RP505K	xx1A	Forced PWM, PWM/VFM Auto Switching		2.3V to 5.5V (VOUT ≥0.8V)	0.6V to 3.3V	±1.5%	2.25MHz	1A		-	DFN(PLP)2020-8
	xx1B			2.3V to 5.5V (VOUT ≥0.8V)	0.6V to 3.3V	±1.5%
	001C			2.3V to 5.5V	Ext. adjustable between 0.8V to 3.3V	±9mV				-
RP506K	xx1A/D	Forced PWM, PWM/VFM Auto Switching		2.5V to 5.5V or 2.5V to 4.5V	0.8V to 3.3V (A/B) 0.6V to 3.3V (D/E)	±1.5%	1.2MHz (D/E/F) 2.25MHz (A/B/C)	2A		-	DFN(PLP)2527-10	1.63MB
	xx1B/E				0.8V to 3.3V (A/B) 0.6V to 3.3V (D/E)	±1.5%
	001C				Ext. adjustable between 0.8V to 4.0V	±9mV				-
	001F				Ext. adjustable between 0.6V to 4.0V	±9mV				-
Dual Output
Product Name	Version	Control	MODE pin	Input Voltage Range	Output Voltage Range	Voltage Accuracy ^*1	Frequency	Output Current ^*2	Thermal Shutdown	Auto- Discharge	Package	Data Sheet (PDF)	Design Guide (PDF)
RP550K Dual	001A	Forced PWM, PWM/VFM Auto Switching		2.3V to 5.5V (VOUT ≥0.8V)	Ext. adjustable between 0.6V to 3.3V	±9mV	2.25MHz	1A x2		-	DFN(PLP)2730-12	1.19MB

*1When the output voltage is adjusted by external resistors, the value means the feedback voltage accuracy.
*2This is an approximate value, because output current depends on conditions and external parts.