ROHM BD3550HFN Data Sheet
Summary
Discover the ultra low-dropout linear regulator IC series designed for high-performance, compact power management in portable electronics. These regulators integrate built-in MOSFETs and soft-start capabilities, minimizing size and cost compared to traditional switching solutions. This technical summary provides detailed electrical characteristics, operating parameters, and application guidelines necessary for engineers designing notebooks, PCs, LCD-TVs, and other digital appliances requiring stable 0.65V–2.7V power conversion. Utilize this guide to efficiently integrate reliable, low-voltage power supplies into your next generation of electronic equipment.
Page 1 Text Content
TECHNICAL NOTE
High-performance Regulator IC Series for PCs
Ultra Low Dropout Linear Regulators for PC BD3550HFN, BD3551HFN, BD3552HFN (0.5～2.0A) ● Description BD3550HFN,BD3551HFN,BD3552HFN ultra low-dropout linear chipset regulator operates from a very low input supply, and offers ideal performance in low input voltage to low output voltage applications. It incorporates a built-in N-MOSFET power transistor to minimize the input-to-output voltage differential to the ON resistance (RON=100mΩ <BD3552HFN>) level. By lowering the dropout voltage in this way, the regulator realizes high current output (Iomax=2.0A <BD3552HFN>) with reduced conversion loss, and thereby obviates the switching regulator and its power transistor, choke coil, and rectifier diode. Thus, BD3550HFN,BD3551HFN,BD3552HFN is designed to enable significant package profile downsizing and cost reduction. An external resistor allows the entire range of output voltage configurations between 0.65 and 2.7V, while the NRCS (soft start) function enables a controlled output voltage ramp-up, which can be programmed to whatever power supply sequence is required. ● Features 1) Internal high-precision reference voltage circuit(0.65V±1%) 2) Built-in VCC undervoltage lockout circuit 3) NRCS (soft start) function reduces the magnitude of in-rush current 4) Internal Nch MOSFET driver offers low ON resistance (100mΩ <BD3552HFN typ>) 5) Built-in current limit circuit 6) Built-in thermal shutdown (TSD) circuit 7) Variable output (0.65～2.7V) 8) Small package HSON8 : 2.9×3×0.6(mm) 9) Tracking function
● Applications Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances
● Line-up
It is available to select power supply voltage and maximum output voltage.
Maximum Output Voltage Package Vcc=5V
0.5A BD3550HFN 1.0A BD3551HFN HSON8 2.0A BD3552HFN
Oct. 2008
Page Summary Contents For ROHM BD3550HFN Data Sheet
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 17 |
| File Size | 663.97 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
How is the output voltage configured if I need a specific range between 0.65V and 2.7V?
Use an external resistor, which allows for the entire range of output voltage configurations from 0.65V to 2.7V.
What benefit does the NRCS (soft start) function provide during power-up?
The soft start function enables a controlled output voltage ramp-up, reducing the magnitude of the in-rush current.
Is this regulator suitable for critical safety systems like aerospace or medical devices?
No. The product is not designed for use with equipment requiring an extremely high level of reliability, such as medical instruments or transportation equipment.
What is the maximum continuous output current available in the line-up?
The BD3552HFN offers a high current output of up to 2.0A.