RP401 Series

1A PWM/VFM Step-up DC/DC Converter

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Description

The RP401 Series are CMOS-based PWM/VFM step-up DC/DC converters which can start-up from Typ. 0.6V. RP401 can be switched from two control types by inputting signal to the MODE pin - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. (RP401N Series can be selected from fixed PWM control or PWM/VFM auto switching control.)

RP401 includes a soft start circuit. By simply using an inductor, a capacitor, (resisters for adjustable type), and a diode as external components, a high-efficiency step-up DC/DC converter can be easily configured. The output voltage can be selected from the internally fixed or the externally adjustment. In addition to SOT-23-5 package, a 1.8mm × 2.0mm square DFN(PL)1820-6 package is also available.

Spec

	Consumer
Input Voltage Range	0.6 V to 5.5 V (6.0 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 400 µA (VSET = 3.0 V, switching) Typ. 130 µA (non-switching, VFM mode) Typ. 230 µA (non-switching, PWM mode)
Standby Current	Typ. 0.15 µA (CE = "L")
Output Voltage Range	1.8 V to 5.5 V (Internally Fixed: xx1, Externally Adjustable:001)
Output Voltage Accuracy	±2%
Feedback Voltage	0.6 V
Feedback Voltage Accuracy	±2%
Oscillator Frequency	Typ. 1.2 MHz
Maximum Duty Cycle	Min. 80%, Typ. 88%
Package	DFN(PL)1820-6, SOT-23-5

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TSD	ILX	OCP	OVP	UVLO	OVLO	Reverse	Shutdown	Soft Start	SSCG	PGOOD	Auto Discharge	Anti-ringing	Sequencing	Max Duty	Ext. Phase	LED Adjust

Functional Description

Quality &
Packages

Product Name	Compatibility	Package	Marking	Reliability
RP401Kxx1x-TR		DFN(PL)1820-6	RP401K	RP401K
RP401Nxx1x-TR-FE		SOT-23-5	RP401N	RP401N-FE

Refer to the datasheets for the details on the product.
The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

TSD	Thermal Shutdown Function
ILX	LX Current Limit Function
OCP	Overcurrent Protection
OVP	Overvoltage Protection
UVLO	Undervoltage Lockout Protection
OVLO	Overvoltage Lockout Protection
Reverse	Reverse Current Protection Circuit
Shutdown	Shutdown Function
Soft Start	Soft Start Function
SSCG	Spread Spectrum Clock Generator Function
PGOOD	Power Good Output
Auto Discharge	Auto Discharge Function
Anti-ringing	Anti-ringing Switch Function
Sequencing	Start-up Sequencing Control
Max Duty	Maximum Duty Cycle
Ext. Phase	Externally Adjustable Phase Compensation
LED Adjust	LED High-speed Dimming Control