DatasheeDatasheett 0.95V to V -1V, 0.5A/1.0A/2.0A 1ch CC Ultra Low Dropout Linear Regulators BD3550HFN BD3551HFN BD3552HFN General Description Key Specifications BD3550HFN, BD3551HFN and BD3552HFN are ultra IN Input Voltage Range: 0.95V to VCC-1V low-dropout linear chipset regulators that operate from VCC Input Voltage Range: 4.3V to 5.5V a very low input supply. They offer ideal performance Output Voltage Range: 0.65V to 2.7V in low input voltage to low output voltage applications. Standby Current: 0A (Typ) The input-to-output voltage difference is minimized by Operating Temperature Range: -10C to +100C using a built-in N-Channel power MOSFET with a maximum ON-Resistance of R =100m(Typ) ON Package W(Typ) x D(Typ) x H(Max) <BD3552HFN>. By lowering the dropout voltage, the regulator realizes high output current (IOUTMAX=2.0A <BD3552HFN>) thereby, reducing conversion loss, making it comparable to a switching regulator and its power transistor, choke coil, and rectifier diode constituents. The BD3550HFN, BD3551HFN, BD3552HFN are available in significantly downsized package profiles and allow low-cost design. An external resistor allows the entire range of output voltage configurations between 0.65V and 2.7V, while the NRCS (soft start) function enables a controlled output voltage ramp-up, which can be programmed to HSON8 a required power supply sequence. 2.90mm x 3.00mm x 0.60mm Features Internal High-Precision Reference Voltage Circuit (0.65V1%) Built-in VCC Undervoltage Lockout Circuit NRCS (soft start) Function Reduces the Magnitude of In-rush Current Internal N-Channel MOSFET Built-in Current Limit Circuit Built-in Thermal Shutdown (TSD) Circuit Tracking Function Applications Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances Lineup Maximum Output Current ON-Resistance(Typ) Package V =5V CC 0.5A 400m BD3550HFN 1.0A 200m HSON8 BD3551HFN 2.0A 100m BD3552HFN Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0J2J0A601140-1-2 2015 ROHM Co., Ltd. All rights reserved. 1/26 TSZ2211114001 02.Nov.2015 Rev.001 BD3550HFN BD3551HFN BD3552HFN Typical Application Circuit, Block Diagram VCC VCC VCC IN IN UVLO Current EN CL Reference Limit Block VCC OUT OUT CL UVLO EN TSD FB Thermal Shutdown GATE NRCS TSD NRCS GND Pin Descriptions Pin No. Pin Name Pin Function 1 VCC Power supply pin 2 EN Enable input pin 3 GATE Gate pin 4 IN Input voltage pin 5 OUT Output voltage pin 6 FB Reference voltage feedback pin In-rush current protection (NRCS) 7 NRCS capacitor connection pin 8 GND Ground pin reverse FIN Connected to heatsink and GND www.rohm.com TSZ02201-0J2J0A601140-1-2 2015 ROHM Co., Ltd. All rights reserved. 2/26 TSZ2211114001 02.Nov.2015 Rev.001 www.rohm.com