Data Sheet Non-Isolated Step-Down 3-Terminal DC/DC Converters BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50 Dimensions (Unit : mm) Description The BP5275 series of DC/DC converters utilize a synchronous rectification system. A control circuit, switching element, and coil are built in, along 5.2 13.8 MAX 2xC0.5 with input/output capacitors, resulting in stable operation with C0.5 no external components required. High conversion efficiency, combined with an original heat dissipation structure, enables configuration an ultra-compact switching power supplies. 500mA output is possible with no heat sink required (800mA with heat sink). 0.75 0.5 1.3 In addition, the ICs are pin-compatible with conventional 2.540.2 2.540.2 TO-220 LDO regulators, making replacement easy. Pin No.1 2 3 Low ripple voltage with high precision output ensure stable operation against the fluctuating voltages from main power Note : Dimensions without tolerance is typical. supplies, making them ideal for use as local power supplies (i.e. for microcontrollers). Applications Power supplies for copiers, personal computers, facsimiles, AV equipment, measuring instruments, vending machines, security device, registers, industrial equipment, and maintenance tools Features 1) No external parts required 2) High power conversion efficiency. 3) Heat sink unnecessary. 4) Low output ripple voltage 5) High output voltage accuracy 6) Pin-compatible with conventional 3-pin LDOs 7) Compact package. BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50 : SIP3 List of the series BP527518 BP527525 BP527533 BP527550 Unit Input voltage 4.5 to 14 4.5 to 14 5.0 to 14 6.0 to 14 V Output voltage 1.8 2.5 3.3 5.0 V Maximum output current 500 / 800 500 / 800 500 / 800 500 / 800 mA (no heat sink / include heat sink) Power conversion 73 78 83 88 % efficiency (Vin=12V) Absolute maximum ratings (Ta=25C) Limits Parameter Symbol Unit BP527518 BP527525 BP527533 BP527550 15 15 15 15 Input voltage VIn V Operating temperature range 30 to 85 30 to 85 30 to 85 30 to 85 C Topr Storage temperature range 40 to 105 40 to 105 40 to 105 40 to 105 Tstg C Allowable maximum surface temperature Tcmax 100 100 100 100 C IO1max Maximum output current 1 500 500 500 500 C Maximum output current 2 (with Heat Sink) IO2max 800 800 800 800 C www.rohm.com 1/7 2011.08 - Rev. A 2011 ROHM Co., Ltd. All rights reserved. 4.01.0 23.0 MAX 20.3 2.6 4.2 5.2BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50 Data Sheet Block diagram Measurement circuit 1 2 3 Control Io Circuit Vin A A Vout V V V Vin GND GND Electrical characteristics BP527518 (Unless otherwise noted : Ta=25C, Vin=12V, lo1=500mA) Parameter Symbol Min. Typ. Max. Unit Conditions Input voltage Vin 4 12 14 V DC Output voltage VO 1.75 1.80 1.85 V IO1=0mA 1 Output current 1 IO1 0 500 mA 1 IO2 0 800 mA With heat sink Output current 2 mV Line regulation Vr 5 50 Vin=4 to 14V mV Load regulation Vl 10 50 IO=0 to 500mA Output ripple voltage 5 80 mVP-P Vp Ts Minimum start-up time 4 7 msec Vin=0V 3V,Ro=3.6 65 73 % Conversion efficiency Operation frequency f 1.5 MHz 1 Derating required according to the input voltage and ambient temperature. BP5275-25 (Unless otherwise noted : Ta=25C, Vin=12V, lo1=500mA) Parameter Symbol Min. Typ. Max. Unit Conditions Input voltage Vin 4 12 14 V DC Output voltage VO 2.45 2.50 2.55 V IO1=0mA Output current 1 1 IO1 0 500 mA 1 Output current 2 IO2 0 800 mA With heat sink Line regulation Vr 5 50 mV Vin=4 to 14V Load regulation Vl 10 50 mV IO1=0 to 500mA Output ripple voltage 5 50 mVP-P Vp Minimum start-up time Ts msec Vin=3V 4V,Ro=5 4 7 Conversion efficiency 73 78 % Operation frequency f 1.5 MHz 1 Derating required according to the input voltage and ambient temperature. www.rohm.com 2011.08 - Rev. A 2/7 2011 ROHM Co., Ltd. All rights reserved.