Single-chip Type with Built-in FET type Switching Regulators Flexible Step-down Switching Regulator with Built-in Power MOSFET No.10027EAT45 BD8649EFV Description The BD8649EFV is a synchronous step-down switching regulator that integrates 2 low resistances N-channel MOSFETs. It achieves 3A continuous output current over a wide input supply range. Current mode operation provides fast transient response and easy phase compensation. Feature 1) Synchronous rectification with built-in FET type DC/DC converter 2) 3.0A output current 3) Range of operation power-supply voltage 4.5V 18V 4) Reference voltage FB 0.8V1% 5) Programmable frequency 100kHz 600kHz 6) Over current protection function 7) Thermal shutdown function 8) Under voltage protection 9) Soft start time out function / Soft start delay circuit 10) Programmable OFFLATCH time Applications FPD,DVD,HDD Recorder,STB,Amusement,Other Absolute maximum rating (Ta=25) Parameter Symbol Ratings Unit Input supply voltage V 20 V IN BOOT terminal voltage V 28 V BOOT EN terminal voltage V GND-0.3 V +0.3 V EN IN *1 Input terminal voltage V GND-0.3 7 V INP SW terminal voltage V GND-0.3 V +0.3 V SW IN *2 Output current I 3.5 A OUT *2 Power dissipation Pd 3.2 W Operating temperature Topr -20 85 Storage temperature Tstg -55 150 *1 V Application terminal: SS/DELAY, FB, FC, RT, PSET INP *2 (70mm70mm, thickness 1.6mm, and four layer glass epoxy substrates)When mounting substrate and the package back exposure part are connected with solder Operating at higher than Ta=25, 25.6mW shall be reduced per 1 Operation condition Ratings Parameter Symbol Unit Min. Typ. Max. Input supply voltage V 4.5 - 18.0 V IN Output current I - - 3.0 A OUT * This product is not designed for protection against radioactive rays. www.rohm.com 2010.09 - Rev.A 1/13 2010 ROHM Co., Ltd. All rights reserved. Technical Note BD8649EFV Electrical characteristic (Unless otherwise noted Ta=25, V =12V, V = 3V) IN EN Limits Parameter Symbol UNIT Condition Min. Typ. Max. V supply current (operating) I - 1.5 2.5 mA V = 0.75V IN Q active FB V supply current (standby) I - 0.8 1.2 mA V = 0V IN Q stby EN Reference voltage (VREF) V 0.792 0.800 0.808 V FB-FC Short FB Oscillation frequency f 270 300 330 kHz R = 56k OSC RT High side FET ON resistance R - 110 160 m I = -1A HFET SW Low side FET ON resistance R - 110 160 m I = 1A LFET SW UVLO voltage V 3.8 4.0 4.2 V V Sweep UVLO IN SW leak current I - 0 5 A V = 0V LSW EN EN terminal H threshold voltage V 1.6 - - V ENH EN terminal L threshold voltage V - - 0.4 V ENL SS/DELAY terminal source current I 2.8 4.0 5.2 A V = 1V SSSO SS SS/DELAY FB Offset voltage V 450 600 750 mV V = 1V SSFBOST SS PSET terminal source current I 3.0 5.0 7.0 A V = 2V PSET PSET PSET terminal threshold voltage V 0.8 1.0 1.2 V PSET V :FB terminal voltage,V :EN terminal voltage,V :SS/DELAY terminal voltage, V :PSET terminal voltage, R :RT resistor FB EN SS PSET RT Current capability should not exceed Pd. Package outline dimension Product number BD8649 1 PIN Lot No. HTSSOP-B20 (Unit: mm) www.rohm.com 2010.09 - Rev.A 2/13 2010 ROHM Co., Ltd. All rights reserved.