TECHNICAL NOTE
High-performance Regulator IC Series for PCs
Ultra Low Dropout
Linear Regulators for PC
BD3550HFN, BD3...
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
) level. By lowering the dropout voltage in this way, the regulator realizes high current output (Iomax=2.0A ) 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 ) 5) Built-in current limit circuit 6) Built-in thermal shutdown (TSD) circuit 7) Variable out...