Data Sheet 18V/500mA Output Step-down DC/DC Converter(Non-isolated) BP5226-18 Absolute Maximum Ratings Dimensions (Unit :mm) Unit Parameter Input voltage Operating temperature range Storage temperature range Symbol Vi Topr Tstg °C °C Maximum surface temperature Tcmax °C Maximum output current Iomax mApk V Conditions DC Refer to derating curve (Ambient temperature + the module self-heating) Tcmax Electrical Characteristics Symbol Parameter Input voltage range Output voltage Output current Line regulation Load regulation Output ripple voltage CTL pin OFF voltage CTL pin ON voltage CTL terminal pull-up resistance Power conversion efficiency Min. Typ. Max. Conditions Unit DC Vi=34V, Io=500mA Vi=34V Vi=20 to 46V, Io=500mA Vi=34V, Io=0 to 500mA Vi=34V, Io=500mA SW1 OFF (VoOFF) SW1 ON (VoON) Derating Curve Derating Curve 600 Output Current Io(mA) Limits 500 400 300 Operation Range 200 100 0 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Ambient Temperature Ta(°C) Conversion Efficiency Vi=34V, Io=500mA Conversion Efficiency (Ta=25°C, Vi=34V) 100 80 60 Application Circuit 40 1211 10 7 5 321 Io FUSE AC24V L1 D1 Ctl C2 Vo Function Output terminal:Vo(18V) CTL terminal Power inductor terminal Skip Power inductor terminal Skip COMMON Skip Skip Input terminal N.C. Input terminal C1 Be sure to use fuse for safety. Please verify operation and characteristics in the customer's circuit before actual usage. Ensure that the load current does not exceed the maximum rating. 20 0 0 100 200 300 400 Output Current Io(mA) 500 Load Regulation Output Voltage Vo(V) BP5226-18 Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0 Load Regulation (Ta=25°C, Vi=12V) 0 100 200 300 400 500 600 700 800 Output Current Io(mA) Input terminal is 10 and 12. External Component Specifications FUSE: fuse Use a quick-acting fuse (1.8A) C1: Input capacitor C2: Output capacitor L1: Power inductor D1: Diode Above 60V, current:above 1.0A www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/1 2010.03 - Rev. B