R5220 Series

400mA PWM Step-down DC/DC Converter with Switch Function

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Description

The R5220 Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier. R5220 also has the function of switching to the LDO regulator. By switching with the MODE pin, the device can be used as an LDO regulator (Output Current 50mA) in the smaller output current range, while it can be used as a DC/DC converter (Output Current 400mA*) under high load conditions. (The polarity of the MODE pin is selectable.) The DC/DC converter contains an under-voltage lockout circuit (UVLO), a soft start circuit, and a latch type protection circuit. By simply using an inductor and a capacitor, a high-efficiency DC/DC converter can be easily configured.

*) This is an approximate value, because output current depending on conditions and external parts.

Spec

	Consumer
Input Voltage Range	2.8 V to 5.5 V (6.5 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 350 µA (DC/DC operation) Typ. 5.0 µA (LDO operation)
Standby Current	Typ. 0.1 µA
Output Voltage Range	1.0 V to 3.3 V (0.1 V step)
Output Voltage Accuracy	±2% (VOUT ≥ 1.5 V, Ta = 25°C) ±30 mV (VOUT < 1.5 V)
Output Current	400 mA (DC/DC operation) 50 mA (LDO operation)
Driver ON-resistance	Pch: 0.5 Ω, Nch: 0.5 Ω (VIN = 3.6 V)
Oscillator Frequency	Typ. 1.2 MHz
Package	DFN(PL)2514-6

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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
R5220Kxxxx-TR		DFN(PL)2514-6	R5220K	R5220K

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