RP505 Series

1A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

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Description

The RP505 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP505 can be selected from two control types by input signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. The xx1A/B version with an internally fixed output voltage type and the 001C version with an externally adjustable output voltage type are available.

RP505 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit. By simply using an inductor and capacitors (and resistors) as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) and output capacitor (10µF) can be used by the switching of 2.25MHz. A 2mm square compact DFN(PL)2020-8 package is available.

Spec

	Consumer
Input Voltage Range	2.3 V to 5.5 V (6.5 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 40 µA (VFM, no load)
Standby Current	Typ. 0 µA
Output Voltage Range	Internally Fixed Ver.: 0.6 V to 3.3 V (0.1 V step) Externally Adjustable Ver.: 0.8 V to 3.3 V
Output Voltage Accuracy	±1.5% (VOUT ≥ 1.2 V, Ta = 25°C) ±18 mV (VOUT < 1.2 V)
Output Voltage Temperature Coefficient	±100 ppm/°C
Feedback Voltage	0.6 V
Feedback Voltage Accuracy	±9 mV
Feedback Voltage Temperature Coefficient	±100 ppm/°C
Output Current	1 A
Driver ON-resistance	Pch: Typ. 0.23 Ω, Nch: Typ. 0.20 Ω (VIN = 3.6 V)
Oscillator Frequency	Typ. 2.25 MHz
Maximum Duty Cycle	Min. 100%
Package	DFN(PL)2020-8

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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
RP505Kxx1x-TR		DFN(PL)2020-8	RP505K	RP505K

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