ROHM BP5275-25 User Guide
Summary
Achieve reliable, stable power anywhere with this series of high-efficiency step-down DC/DC converters. Designed for compactness and minimal external components, these modules provide low-ripple voltage outputs (1.8V–5.0V) suitable for diverse applications, including PCs, industrial controls, A/V equipment, and measurement tools. The comprehensive data sheet details required specifications, operational ranges, pin compatibility with standard LDOs, and conversion efficiencies, simplifying integration for engineers needing robust local power supplies.
Page 1 Text Content
Data Sheet
Non-Isolated Step-Down 3-Terminal DC/DC Converters BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Description Dimensions (Unit : mm)
The BP5275 series of DC/DC converters utilize a synchronous rectification system. A control circuit, switching element, and coil are built in, along 13.8 MAX 2x C0.5 5.2 with input/output capacitors, resulting in stable operation with
no external components required. High conversion efficiency, combined with an original heat dissipation structure, enables configuration an ultra-compact switching power supplies. 500m A output is possible with no heat sink required (800m A with heat sink).
In addition, the ICs are pin-compatible with conventional 1.3
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 .3
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
BP5275−18 BP5275−25 BP5275−33 BP5275−50 Unit
Input voltage 4.5 to 14 4.5 to 14 5.0 to 14 6.0 to 14 Output voltage 1.8 2.5 3.3 5.0
Maximum output current
(no heat sink / include heat sink) Power conversion efficiency (Vin=12V)
Absolute maximum ratings (Ta=25°C)
Limits
Parameter Symbol Unit
BP5275−18 BP5275−25 BP5275−33 BP5275−50
Input voltage VIn
Operating temperature range −30 to 85 −30 to 85 −30 to 85 −30 to 85 °CTopr
Storage temperature range Tstg −40 to 105 −40 to 105 −40 to 105 −40 to 105 °C
Allowable maximum surface temperature Tcmax °C Maximum output current 1 IO1max °C
Maximum output current 2 (with Heat Sink) IO2max °C
1/7 2011.08 - Rev. Awww.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BP5275-25 User Guide
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 9 |
| File Size | 615.50 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
Are external components required for installation?
No, the system contains a control circuit, switching element, and coil, making no external components necessary.
Do I need a heat sink for continuous operation?
If the output is 500mA, no heat sink is needed; however, 800mA requires including one as specified in IO2max.
How does this converter integrate with existing electronics?
The ICs are pin-compatible with conventional 2.54±0.2 TO-220 LDO regulators.
What is the typical output quality and stability?
It provides low ripple voltage and high precision output, ensuring stable operation against fluctuating main power supplies.