RP400 Series

Current Mode PWM/VFM Step-up DC/DC Converter

Download Datasheet

Description

The RP400 Series are CMOS-based automatic switch PWM- or VFM-controlled step-up DC/DC converters. RP400 includes a soft start circuit. By simply using an inductor, a capacitor, a diode, and (resistors) as external components, a high-efficiency step-up DC/DC converter can be easily configured. Due to current mode PWM control, the RP400 provides a fast response and high efficiency. Ceramic output capacitors can be used.

The output voltage can be selected from the internally fixed or the externally adjustment. The RP400 has an anti-ringing switch that prevents inductor current from ringing in PWM discontinuous mode. RP400 switches automatically to VFM control in low output current, keeping high efficiency. 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	0.7 V to 5.5 V (6.0 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 300 µA (VSET = 3.0 V, switching) Typ. 160 µA (non-switching)
Standby Current	Typ. 0.15 µA　(CE="L") (Ver. A/C)
Start-up Voltage	Max. 0.9 V (Ver.C: Max. 1.5 V)
Output Voltage Range	1.8 V to 5.0 V (Internally Fixed Ver.: xx1, Externally Adjustable Ver.: 001)
Output Voltage Accuracy	±2% (Ta = 25°C)
Oscillator Frequency	Typ. 700 kHz
Maximum Duty Cycle	Typ. 88%
Package	DFN(PL)1820-6, SOT-23-5

Download Datasheet

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	Package	Marking	Reliability
RP400Kxx1A-TR	DFN(PL)1820-6	RP400Kxx1A	RP400K
RP400Kxx1B-TR	DFN(PL)1820-6	RP400Kxx1B	RP400K
RP400Kxx1C-TR	DFN(PL)1820-6	RP400Kxx1C	RP400K
RP400Nxx1A-TR-FE	SOT-23-5	RP400Nxx1A	RP400N-FE
RP400Nxx1B-TR-FE	SOT-23-5	RP400Nxx1B	RP400N-FE
RP400Nxx1C-TR-FE	SOT-23-5	RP400Nxx1C	RP400N-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