BL2554

BL2554 BELLING | Alldatasheet

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Technical content

b el l i ng.co m cn V1.6 Adjustable USB Load Current Switch

DESCRIPTION

The BL2554 is Adjustable USB Load Current Switch Current Limited designed for high side load switching applications. The internal current limiting circuit protects the input supply against large output short circuit current which may cause the supply to fall out of regulation. The current limit threshold is programmed with an external resis tor from ISET Pin to ground. The quiescent supply current is typically 150μA, making the device ideal for portable battery operated equipment. In shutdown mode, the supply current decreases to less than 0.1μA. Additional features include thermal shutdown and constant current output characteristics if current exceed its current limit. The BL2554 is available in SOT23 and SOT23 package s

FEATURES

2.5 to 5.5V input voltage range Controlled turn on 0.15 A adjustable current limit 6% current limit accuracy 0.25ohm on resistance Fast current limit response time Logic Control Shutdown (IQ<1uA) Thermal shutdown and UVLO Reverse current blocking SOT23 and SOT23 package s

APPLICATIONS

MID, MP4… Set top boxes Notebook and PC mother board USB supplied Devices TYPICAL APPLICATION ORDERING INFORMATION PIN OUT & MARKING SOT23 SOT23 Note: YW means the year and week parts being manufactured, subjected to change. CM is the code of the product, it will not be changed on any part. Part No. Package Tape&Reel BL2554CB5TR SOT23 3000/Reel BL2554CB6TR SOT23 3000/Reel B BL2554

b el l i ng.co m cn BL2554 V1.6 ABSOLUTE MAXIMUM RATING Parameter Value Max Input Voltage Max Operating Junction Temperature(Tj) 125 C Ambient Temperature(Ta) C C Maximum Power Dissipation SOT23 250mW Storage Temperature(Ts) C 150 C Lead Temperature & Time 260 10S ESD (HBM) >4000V Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS Parameter Value Input Voltage Range Max. 5.5V Operating Junction Temperature(Tj) C 125 C ELECTRICAL CHARACTERISTICS (Vin=5V, T A =25 Symbol Parameter Conditions Min Typ Max Unit Vin Input Voltage Range 2.6 5.5 V Iq Quiescent Current Active, Vfb=0.65, No Switching 150 300 uA Shutdown uA Rdson Switch Rdson Iout=500mA 250 mohm Ilimit Adjustable current limit R_Iset=53K ohm R_Iset=25K ohm R_Iset =20 K ohm 0.5 1.0 A Irevlk Reverse Voltage Leakage Current Vout=5V, Vin=0V 0.1 uA Vh_on ON Input High Voltage 1.5 V Vl_on ON Input Low Voltage 0.4 V Tsd Thermal shutdown Temp. 155 o C SETTING THE CURRENT LIMIT THRESHOLD RILIM ( K Ω Typical Current Limit (mA) RILIM ( K Ω Typical Current Limit (mA) 200 138 520 180 152 612 151 179 873 100 266 1295 324 389

b el l i ng.co m cn BL2554 V1.6 PIN Switch Output, the output of power switch GND Ground Iset Current limit setting pin. Connecting a resistor (R_Iset) from this pin to ground will adjust the current limit On Control input, enable pin, active high Vin Supply input voltage nFAULT Fault flagging pin. Connect a pull up resistor to IN, when in fault conditions, this pin is asserted low ELECTRICAL PERFORMANCE Tested under TA=25 C, unless otherwise specified Turn on delay and rise time Turn off delay and fall time Device enabled into short circuit Full load to short circuit transient response

b el l i ng.co m cn BL2554 V1.6 Short circuit to full load recovery response No load to short circuit transient response Short circuit to no load recovery response No load to 1 transient response to no load transient response Switch current Vs. dropout voltage

b el l i ng.co m cn BL2554 V1.6 BLOCK DIAGRAM DETAILED The BL2554 is a current limited switch that protects systems and loads which can be damaged or disrupted by the application of high currents. The core of each device is a 0.10Ω P channel MOSFET and a controller capable of functioning over a wide input operating range of 2.6 5.5V. The controller protects against system malfunctions through current limiting, undervoltage lockout and thermal shutdown. The current limit is adjustable from 0.15A to 1. A through the selection of an external resistor. On/Off control The ON pin controls the state of the switch. When ON is hig h, the switch is in the on state. Activating ON continuously holds the switch in the on state so long as there is no fault. An undervoltage on VIN or a junction temperature in excess of 155°C overrides the ON control to turn off the switch. The BL2554 doe s not turn off in response to an over current condition but instead remains operating in a constant current mode so long as ON is active and the thermal shutdown or undervoltage lockout have not activated. The ON pin control voltage and VIN pin have independent and recommended operating ranges. The ON pin voltage can be driven by a voltage level higher than the input voltage. Current limiting The current limit ensures that the current through the switch doesn't exceed a maximum value while not limiting at less than a minimum value. The current at which the parts will limit is adjustable through the selection of an external resistor connected to ISET. Information for selecting the resistor is found in the Application Info section. The BL2554 has no current limit blanking period so it will remain in a constant current state until the ON pin is deactivated or the thermal shutdown turns off the switch. Thermal Shutdown The thermal shutdown protects the die from internally or externally generated excessive temperatures. During an over temperature condition the switch is turned off. The switch automatically turns on again if temperature of the die drops below the threshold temperature.

b el l i ng.co m cn BL2554 V1.6 PACKAGE OUTLINE Package SOT23 Devices per reel 3000 Unit mm Package specification: Package SOT23 Devices per reel 3000 Unit mm Package specification: