RICOH R5520H Technical data

R5520H SERIES

USB HIGH-SIDE POWER SWITCH

NO.EA-091-111108

OUTLINE

The R5520H is CMOS-based high-side MOSFET switch IC for Universal Serial Bus (USB) applications. Low ON Resistance (Typ.100mΩ) and low supply current (Typ.20μA at active mode) are realized in this IC.

An over-current limit circuit, thermal shutdown circuit, and an under voltage lockout circuit are built-in as protection circuits. Further, a delay circuit for flag signal after detecting over-current, is embedded to prevent miss-operation of error flag because of inrush current. The R5520H is ideal for applications of protection for USB power supply.

FEATURES

•	Built-in P-channel MOSFET Switch
• Supply Current ............................................................		Typ. 20μA (at Active Mode)
• Switch ON Resistance ...............................................		Typ. 100mΩ
•	Output Current.............................................................	Min. 500mA
•	Flag Delay Time ..........................................................	Typ. 10ms.

•OverCurrent Limit / Short Circuit Protection

•Built-in Under Voltage Lockout (UVLO) Function

•Built-in Thermal Shutdown Protection

•Built-in Soft-start Function

• Package .......................................................................

SOT-89-5

APPLICATIONS

•USB Peripherals

•Notebook PCs

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R5520H

BLOCK DIAGRAMS

			R5520H001A/B
IN								OUT

EN			GATE				CURRENT
			CONTROL				LIMIT

FLAG

FLG

DELAY

UVLO

THERMAL

SHUTDOWN

GND

SELECTION GUIDE

The logic of the enable pin for the ICs can be selected at the user’s request.

Product Name	Package	Quantity per Reel	Pb Free	Halogen Free
R5520H001 -T1-FE	SOT-89-5	1,000 pcs	Yes	Yes

: Designation of the logic of the enable pin.

(A) "L" active

(B) "H" active

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R5520H

PIN CONFIGURATIONS

• SOT-89-5

5 4

1 2 3

PIN DESCRIPTIONS

• SOT-89-5

Pin No	Symbol	Pin Description
1	EN	Enable Pin
2	GND	Ground Pin
3	FLG	FLG pin (Open Drain Output)
4	IN	Power Supply Pin
5	OUT	Output Pin

ABSOLUTE MAXIMUM RATINGS

Symbol	Item	Rating	Unit
VIN	Input Voltage	6.0	V
VEN	Enable Pin Input Voltage	−0.3 to VIN+0.3	V
VFLG	Flag Voltage	−0.3 to 6.0	V
IFLG	Flag Current	14	mA
VOUT	Output Voltage	−0.3 to VIN+0.3	V
IOUT	Output Current	Internal Limited
PD	Power Dissipation (SOT-89-5)	900	mW
Topt	Operating Temperature Range	−40 to 85	°C
Tstg	Storage Temperature Range	−55 to 125	°C

) For Power Dissipation, please refer to PACKAGE INFORMATION.

ABSOLUTE MAXIMUM RATINGS

Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field.

The functional operation at or over these absolute maximum ratings is not assured.

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R5520H

ELECTRICAL CHARACTERISTICS

• R5520H001A/B

Topt=25°C

Symbol	Item	Conditions	Min.	Typ.	Max.	Unit
VIN	Input Voltage		4.0		5.5	V
IDD1	Supply Current 1	*Note1 OUT=open, (Active)		20	60	μA
IDD2	Supply Current 2	*Note2 OUT=open, (OFF)		0.5	5.0	μA
RON	Switch On Resistance	VIN=5V, IOUT=500mA		100	140	mΩ
		VIN=4V, IOUT=500mA		110	150	mΩ
tON	Output Turn-on Delay	RL=10Ω		2	12	ms
tOFF	Output Turn-off Delay	RL=10Ω		5	20	μs
VUVLO	UVLO Threshold	VIN=increasing	2.1	2.4	2.7	V
		VIN=decreasing		2.2		V
ITH	Current Limit Threshold	Ramped Load		1.2	2.0	A
ILIM	Short Current Limit	VOUT=0V	0.50	0.75	1.00	A
tFD	Over Current Flag Delay	From Over Current to FLG="L"	5	10	20	ms
TTS	Thermal Shutdown	Tj=increasing		135		°C
	Temperature Threshold	Tj=decreasing		125
IEN	Enable Pin Input Current			0.01	1.00	μA
VEN1	Enable Pin Input Voltage 1	VEN=increasing		2.1	2.4	V
VEN2	Enable Pin Input Voltage 2	VEN=decreasing	0.8	1.9		V
ILO	Output Leakage Current			1	10	μA
VLF	Flag "L" Output Voltage	ISINK=1mA			0.4	V
IFOF	Flag Off Current	VFLAG=5.5V		0.05	2.00	μA

(Note1) EN=L (R5520H001A), EN=H (R5520H001B)

(Note2) EN=H (R5520H001A), EN=L (R5520H001B)

RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)

All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions.

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R5520H

OPERATION

This explanation is based on the typical application.

(1) There is a parasitic diode between source and drain of the switch transistor. (Refer to the block diagram.) Because of this, in both cases of enable and disable, if the voltage of OUT pin is higher than IN pin, current flows from OUT to IN.

(2) In case that OUT pin and GND is short, if over-current would continue, the temperature of the IC would increase drastically. If the temperature of the IC is beyond 135°C, the switch transistor turns off and the FLG pin level becomes "L". Then, when the temperature of the IC decreases equal or lower than 125°C, the switch transistor turns on and FLG becomes "H". Unless the abnormal situation of OUT pin is removed, the switch transistor repeats on and off.

Refer to the 21) over-current protection operation in the typical characteristics.

(3) Over-current level is set internally in the IC. There are three types of response against over-current:

cUnder the condition that OUT pin is short or large capacity is loaded, if the IC is enabled, the IC becomes constant current state. After the flag delay time passes, FLG becomes "L", that means over current state. Refer to the 20) current limit transient response of typical characteristics.

dWhile the switch transistor is on, if OUT pin is short or large capacity is loaded, until the current limit circuit responds, large transient current flows. After the transient current is beyond the over-current de-tector threshold and delay time of the flag passes, FLG becomes "L", that means over current state.

Refer to the 22), 23) over-current limit transient response of typical characteristics.

eIn the case that load current gradually increases, the IC is not into the constant current state until the current is beyond over current limit. Once the level is beyond the over current detector threshold, load current is limited into over current limit level. Note that load current continuously flows until the load current is beyond the over-current detector threshold.

(4) FLG pin is Nch Open drain output. If the over-current or over-temperature is detected, FLG becomes "L". If over-current is detected, FLG becomes "L" after the flag delay time tFD passes. Therefore flag signal is not out with inrush current.

(5) UVLO circuit prevents that the switch transistor turns on until the input voltage is beyond 2.4V. UVLO circuit can operate when the IC is enabled.

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