RICOH Electronic Devices PMIC - Power Distribution Switches, Load Drivers R5524N002B-TR-FE

APPLICATIONS:

PCs and PC Peripherals 

Digital Televisions (DTV)

Set Top Boxes (STB)

Printers

PDA

Game Consoles

PMIC - Power Distribution Switches, Load Drivers Part number:

About RICOH Electronic Devices Co., LTD

RICOH Electronic Devices Co., LTD. is a leading global provider of semiconductor products, offering a comprehensive portfolio of CMOS Analog Power Management ICs and Real Time Clock ICs that enable engineers to design advanced applications for the consumer, industrial, and automotive markets.

Ricoh has an extensive expertise in technologies and solutions including power saving, small footprint, high performance, product longevity program, and high reliability.

Product Categories

Capacitors
Discrete Semiconductor Products
Power Supplies - External/Internal (Off-Board)
Sensors, Transducers
Circuit Protection
Integrated Circuits (ICs)
Optoelectronics
RF/IF and RFID
Development Boards, Kits, Programmers
Isolators
Power Supplies - Board Mount
Resistors

R5524 Series USB HIGH-SIDE POWER SWITCH / LOAD SWITCH

OUTLINE

The R5524x is a CMOS-based high-side MOSFET switch IC which conforms to the universal serial bus (USB) standard. It can also be used as a load switch IC with protection function. By using an Nch MOSFET with low On-resistance (Typ. 100 mΩ) as a switching transistor, the device can provide low dropout voltage. Internally, the device consists of an overcurrent limiting circuit, a thermal shutdown circuit, an undervoltage lockout (UVLO) circuit and a reverse current protection circuit. The device also consists of an internal delay circuit to prevent the output of false flag signals caused by inrush current. To achieve simplification of layout design, the overcurrent detection accuracy has been improved. The R5524x is offered in a 5-pin SOT-23-5 package and a 6-pin DFN(PLP)1820-6 package which achieve the smallest possible footprint solution on boards where area is limited.

FEATURES

N-channel MOS High-Side Switch IC

Switch ON Resistance······································· Typ. 100 mΩ at 5 V Input

Current Limit Threshold ····································· Min. 650 mA(1) , Min. 1.25 A(2)

Overcurrent Limit·············································· Min. 550 mA

Flag Delay Time ··············································· Typ. 20 ms

Under-voltage Lockout (UVLO) Circuit

Thermal Shutdown Circuit

Reverse Current Protection Circuit

Package························································· SOT-23-5, DFN(PLP)1820-6(3)

THEORY OF OPERATION Overcurrent Limit Function

The R5524x001A/001B has the built-in latch-off type over-current limit circuit. When the over-current is detected, the protection circuit becomes active and the switch-transistor is turned OFF. The latch function is released if the input voltage value is exceeded in the release threshold of the UVLO circuit value after when it became lower than the detection threshold of the UVLO circuit value; or the EN pin set to the enabling condition again after set to the disabling condition. If the over current condition occurred when the input voltage value was close to the minimum operating input voltage value. Under this condition, the voltage descends by the parasitic impedance on the power supply side, and it might fall below the detection threshold of the UVLO circuit. In this case, the switch-transistor is turned OFF and because of that the voltage drop of power line’s parasitic impedance stops; the latch function is released with the UVLO and it becomes the over current condition again. The switch transistor keeps continual ON and OFF until one of the following is done; increasing the input voltage value; the setting of EN pin is disabling; or reducing the value of load current. Moreover, the supply-voltage changed by the load-current dramatically changed depends upon the parasitic impedance of the wiring on the load side or the power supply side. Due to this, decreasing the parasitic impedance by the wiring on board is recommended. The switch transistor of the R5524x001A/001B is turned OFF when the latch-off-function operates under the condition of the load of the constant current as the load device, such as the electronic load and so on, connecting with the VOUT pin of the R5524x001A/001B. Because the load device keeps the constant current, the VOUT pin voltage may become negative potential. If the VOUT pin is exceed the absolute maximum rating may cause the permanent damages to the device, please avoid using in this situation. The R5524x002A/002B and R5524N004A have the built-in over current protection circuit as the constant current type. It detects as the over-current condition, if the current flows as the ITH defined.

Then operating the switch transistor to limit the output current to be the constant current defined by the ILIM.

If the condition of the over-current limit caused by the VOUT pin clamped to the GND were continued the temperature of the ICs would increase drastically.

The switch-transistor is turned OFF if the temperature of the ICs becomes over 135°C (Typ.). And after this, the switch-transistor is turned ON again when the temperature of ICs decreased approximately 15°C.

The switch-transistor keeps continual ON and OFF until either the switch is turned OFF or the VOUT pin is removed from GND.

About US

Shenzhen Angel Technology Electronics Co Was Founded In HongKong Since 2006, Our branch Located In The Silicon Valley Of China, Shenzhen.

Shenzhen Angel Technology Electronics Co have have obtained the ISO9001 quality management system certification.

The Mission Of Shenzhen Angel Technology Electronics Co has always been to provide Quality Electronics Components To Manufacturers Worldwide.Angel-tech's vision is become the excellent electronic components supplier with the highest satisfaction between employees and customers. Early On We became the Primary channel for project closures And Inventory build-ups for Major Distributors such as Arrow Electronics and Contract Manufacturers. Angel Technology Electronics Co Has since then added Sourcing Of High Quality Components From Local Manufacturers In China.