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BL2555 Dataheets PDF



Part Number BL2555
Manufacturers BELLING
Logo BELLING
Description 1CH ADJ Current-Limited Power Distribution Switch
Datasheet BL2555 DatasheetBL2555 Datasheet (PDF)

BL2555 1CH ADJ Current-Limited Power Distribution Switch Features • Single-Channel Power Distribution Switch • Programmable Current Limit in 0.4A~2A Output Current • Enable polarity: Active High • 2.4V to 5.5V Supply Range • Under-Voltage Lockout • -40°C to +85°C Ambient Temperature Range • Accurate Current Limit • 15µA Quiescent Current • 80mΩ MOSFET • Thermal-Shutdown Protection • Built-In Soft Start • Reverse Current Blocking (No Body Diode) • Available in SOT23-5 Package Applications • S.

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BL2555 1CH ADJ Current-Limited Power Distribution Switch Features • Single-Channel Power Distribution Switch • Programmable Current Limit in 0.4A~2A Output Current • Enable polarity: Active High • 2.4V to 5.5V Supply Range • Under-Voltage Lockout • -40°C to +85°C Ambient Temperature Range • Accurate Current Limit • 15µA Quiescent Current • 80mΩ MOSFET • Thermal-Shutdown Protection • Built-In Soft Start • Reverse Current Blocking (No Body Diode) • Available in SOT23-5 Package Applications • Set-Top Boxes • Wi-Fi Router/AP • USB 3G Datacard/ USB Dongle • ONT Boxes • USB Ports and Hubs, Laptops, and Desktops • Smartphone and PDA • MiniPCI Accessories General Description The BL2555 Power Distribution Switch features internal current limiting to prevent damage to host devices due to faulty load conditions. The BL2555 develops ultra-low on-resistance switch with programmable current limiting to protect the power source from over current and short circuit conditions. It integrates the over temperature protection and discharges the output capacitor during the shutdown. In case the output is pulled higher than the input voltage under the shutdown, the BL2555 can block the current flowing from the output to the input. The BL2555 is available in SOT23-5 package. Typical Application Circuit VIN VOUT IN OUT CIN ON/ OFF EN SET GND RSET COUT Basic Application Circuit www.belling.com.cn 1 V1.0 BL2555 1CH ADJ Current-Limited Power Distribution Switch Pin Description Pin Configuration TOP VIEW OUT 1 5 IN GND 2 SET 3 4 EN SOT23-5 Pin Description Pin Name 1 OUT 2 GND 3 SET 4 EN 5 IN Function Output Pin. Ground Pin. Current limit programming Pin. Connect a resistor RSET from this pin to GND to program the current limit. ON/OFF control. Pull high to enable IC, Do not float. Power Supply Pin Order Information Model Package BL2555 SOT23-5 MOQ 3000PCS www.belling.com.cn 2 V1.0 BL2555 1CH ADJ Current-Limited Power Distribution Switch Absolute Maximum Ratings (1) (2) (3) All Pins Voltage ……………...……………………...………….…………………..……..………...… -0.3V to +6V Operating Virtual Junction (TJ) ……………...………......……………….……..……..………..… -40°C to +150°C Ambient Temperature Operating Range (TA) …………………..…………………………………... -40°C to +85°C Storage Temperature Range (TS) …………………………………...……………………………... -55°C to +150°C Lead Temperature (Soldering, 10s) (TL) ………………………..…………………………………………... +260°C Junction-to-ambient thermal resistance (RθJA) …………………...…………..…………..…………….…. 200°C/W Junction-to-case thermal resistance (RθJC) ……………..……….………………………...…………….… 130°C/W Note 1: Exceeding these ratings may damage the device. Note 2: The device is not guaranteed to function outside of its operating conditions. Note 3: θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Pin 2 of SOT23-5 packages is the case position for θJC measurement. Recommended Operating Conditions Input Voltage Pin …….………....…………..……………………….……………..……..……....… +2.4V to +5.5V All Other Pins …………...…….…...…………..……….……………………..………..........……....… 0V to +5.5V Junction Temperature Range (Tj) …………..………………………………………………….….. -40°C to +125°C Ambient Temperature Range (TA) ………...………………..………………………..……………... -40°C to +85°C Electrical Characteristics (VIN = 5V, CL=1µF, per channel, TA = 25°C unless otherwise specified) Parameter Input Voltage Range Shutdown Input Current Quiescent Supply Current FET RON ENB Rising Threshold ENB Falling Threshold ENB Leakage IN UVLO Threshold IN UVLO Hysteresis Over Current Limit Thermal Shutdown Temperature Thermal Shutdown Hysteresis Symbol VIN ISHDN IQ RDS(ON)1 VENB(H) VENB(L) IENB VIN,UVLO VIN,HYS ILIM ILIM(MIN) ILIM(MAX) TSD THYS Test Conditions Open load, IC Disabled Open load, IC Enabled VENB=5.5V Minimum Duty Cycle RSET=6.8kΩ Min 2.4 2 0.75 Typ. 0.1 15 80 0.1 1.0 0.4 2 130 20 Max 5.5 1 0.8 1 2.3 1.25 Unit V µA µA mΩ V V µA V V A A A ℃ ℃ www.belling.com.cn 3 V1.0 BL2555 1CH ADJ Current-Limited Power Distribution Switch Typical Performance Characteristics (4) (5) Ω Note (4): Performance waveforms are tested on the evaluation board. Note (5): VIN = 5V, COUT = 1µF, RSET = 6.8k , TA = +25ºC, unless otherwise noted. tr VoUT 90% 10% tf 90% 10% VEN 50% ton VoUT 90% Figure 1 Tr, Tf, Ton, Toff waveforms.


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