BD3540NUV, BD3541NUV are low voltage output linear 1ch series chipset regulator ICs that operate from a very low input supply, and offer 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=200mΩ～ 400mΩ) level. By lowering the dropout voltage in this way, the regulator realizes high current output (Iomax=0.5A～1.0A) with reduced conversion loss, and thereby obviates the switching regulator and its power transistor, choke coil, and rectifier diode. Thus, the BD3540NUV, BD3541NUV are 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.
The BD3540NUV/BD3541NUV series are high‑performance, low‑voltage linear regulator ICs for desktop and notebook PCs. They operate from a very low input voltage, incorporate a built‑in N‑MOSFET to reduce dropout, and provide output currents of 0.5 A (BD3540NUV) or 1 A (BD3541NUV) with output voltages programmable between 0.65 V and 2.7 V.
Key features include high‑precision regulation, built‑in undervoltage lockout, soft‑start (NRCS), current limit, thermal shutdown, and a compact VSONO10V3030 package (3.0 × 3.0 × 1.0 mm). The device is suited for notebooks, desktops, LCD‑TVs, DVD players and other digital appliances.
| Input voltage range | 3.0 V – 5.5 V |
|---|---|
| Output voltage setting range | 0.65 V – 2.7 V |
| Maximum output current (BD3540NUV) | 0.5 A |
| Maximum output current (BD3541NUV) | 1.0 A |
| Package dimensions | 3.0 × 3.0 × 1.0 mm (VSONO10V3030) |
| Dropout voltage (typical) | 200 mV – 300 mV |
| ON resistance (RON) | 200 mΩ – 400 mΩ |
| Operating temperature range | -10 °C – +100 °C |
| UVLO typical threshold | 2.5 V |
The BD3540NUV can deliver up to 0.5 A of output current.
It uses a VSONO10V3030 package measuring 3.0 × 3.0 × 1.0 mm.
The typical UVLO threshold voltage is 2.5 V.
The device operates with an input voltage from 3.0 V to 5.5 V.