RICOH R5220x Technical data

R5220x Series

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

The R5220x Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier. R5220x 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.

FEATURES

• Supply Current (DC/DC mode) (ISS3) ···Typ. 350μA (VIN=3.6V)	• Oscillator Frequency (fosc) (DC/DC section)········ 1.2MHz
• Supply Current (VR mode) (ISS2) ·····Typ. 5μA (VIN=VR SET VOUT+1V)	• Fold-back Protection Circuit (VR section)···· Current limit Typ. 60mA
• Standby Current (ISS1)·····················Typ. 0.1μA (VIN=DC/DC SET VOUT+1, in standby)	• Soft Start Time (tstart) (DC/DC section)············ Typ. 0.2ms
• Input Voltage Range (VIN)···············2.8V to 5.5V (Absolute maximum rating: 6.5V)	• Coil-current Limit Circuit (DC/DC section)···· Current limit Typ. 800mA
• Output Voltage Range (VOUT)··········1.0V to 3.3V (internally fixed)	• Latch Type Protection Circuit (DC/DC section) ··· Delay time for protection
• Output Voltage Accuracy ················± 2% (VOUT ≥ 1.5V)	Typ. 3ms
• UVLO Detect Voltage (VUVLO) ·········Typ. 2.35V	• Packages ·····················································DFN(PLP)2514-6, SON-6
	• Ceramic capacitors can be used. ················ CIN=COUT=10μF or more

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

BLOCK DIAGRAM

		R5220x
VIN	1
		OSC
		OUTPUT	6	LX
		CONTROL
	Vref	UVLO
		Current Limit
		Soft
MODE 3		Start
CE	4		5	VOUT
		Vref

Current Limit

GND 2

SELECTION GUIDES

Halogen Free	Package	Q'ty per Reel	Part No.
	DFN(PLP)2514-6	5,000 pcs	R5220K	.xx$		-TR
	SON-6	3,000 pcs	R5220D		.xx$		-TR-FE

.xx. : Specify the output voltage within the range of

1.0V (.10.) to 3.3V (.33.) in 0.1V steps. Alternatively, specify a combination of output voltage using serial numbers.

TYPICAL APPLICATION

	R5220x
		L
6	VIN	VOUT	5
1	LX	CE	4		LOAD
CIN				COUT
2	GND	MODE 3

L : 4.7μH (VLP5610T-4R7MR90 : TDK)

CIN, COUT=10μF (C2012JB0J106K : TDK)

.$. : Select from (.1.) Standard code products, (.2.) optional code products.

(For optional code products, visit our Website to check.)

. : Select the polarity of the MODE pin from

(.A.) "H" : DC/DC, "L" : VR or (.B.) "H" : VR, "L" : DC/DC.

PACKAGES (Top View)
DFN(PLP)2514-6			SON-6
6	5	4	6	5	4
1	2	3	1	2	3

1	Lx				1	Lx
2	GND				2	GND
3	MODE				3	MODE
4	CE				4	CE
5	VOUT				5	VOUT
6	VIN				6	VIN

) The tab and tab suspension leads on back side are substrate level (GND).

TYPICAL CHARACTERISTIC

R5220x181A DC/DC Efficiency vs. Output Current

	100
η (%)	80
	60
Efficiency
	40
				VIN=2.8V
	20			VIN=3.6V
				VIN=5.5V
	0
	0.1	1	10	100	1000

Output Current(mA)

APPLICATIONS

• Power source for battery-powered equipment • Power source for hand-held communication equipment, cameras, and VCRs

No.EK-121-111001

Step-down DC/DC Converter

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