RP501 Series

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

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Description

The RP501 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP501 can be selected from two control types by input 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. RP501 includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) can be used by the switching of 2.25MHz. The frequency accuracy improved to ±10%.

Spec

	Consumer
Input Voltage Range	2.5 V to 5.5 V (6.5 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 450 µA (PWM, no switching) Typ. 140 µA (VFM, no switching)
Standby Current	Typ. 0 µA (CE = "L")
Output Voltage Range	1.0 V to 3.3 V (0.1 V step)
Output Voltage Accuracy	±1.5% (Ta = 25°C)
Output Current	1 A
Oscillator Frequency	Typ. 2.25 MHz
Maximum Duty Cycle	Min. 100%
Package	DFN(PL)2527-10

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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
RP501Kxx1x-TR		DFN(PL)2527-10	RP501K	RP501K

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