onsemi NCP720BMT140TBG

Overview

NCP720BMT140TBG from onsemi is a 350 mA very low dropout (VLDO) CMOS voltage regulator with NMOS pass transistor and separate VBIAS supply, delivering 1.40 V fixed output with ±2% accuracy over −40°C to +125°C. It achieves 110 mV typical dropout at full load, supports 0.8–5.5 V input and 2.4–5.5 V bias rails, and operates stably with only a 2.2 µF ceramic output capacitor - ideal for space-constrained, noise-sensitive portable electronics.

For engineers reviewing the NCP720BMT140TBG datasheet, pinout, applications, or equivalent options, key selection criteria include dual-rail operation (VIN/VBIAS), ultra-low bias current (80 µA typ), monotonic soft-start, high PSRR (>65 dB at 1 kHz for VBIAS), and thermal shutdown at +160°C.

Technical Context

The NCP720BMT140TBG implements a dual-supply architecture where VIN powers the NMOS pass element while VBIAS independently supplies internal control circuitry-including reference, error amplifier, and enable logic-enabling stable regulation even when VIN approaches VOUT. This separation allows ultra-low dropout (110 mV) and eliminates output capacitor dependency on loop stability common in PMOS LDOs.

Its built-in soft-start ensures monotonic VOUT rise to limit inrush current, and the enable pin features internal hysteresis with 1.1 V turn-on threshold. Undervoltage lockout activates below 1.6 V on VBIAS with 0.2 V hysteresis, and thermal shutdown disables output above +160°C junction temperature, re-enabling at +140°C.

Key Specifications

Pinout & Package

Package: WDFN6 2 mm × 2 mm, 0.65 mm pitch, exposed thermal pad (Case 511BR). Requires soldering of thermal pad to PCB ground plane for optimal thermal performance (R_JA = 65°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout, dual-rail voltage regulator applications.

Compared with TPS7A2025PDQNR and NCP114AMX140TCG, the NCP720BMT140TBG uniquely delivers 1.40 V at 350 mA with dual-rail operation, enabling independent optimization of noise suppression (via VBIAS PSRR) and dropout (via NMOS topology) - critical for advanced mobile SoC power domains.

Availability

NCP720BMT140TBG is available at Aetrix Electronics and suitable for smartphone core logic rails, tablet I/O voltage domains, camera sensor analog bias, and DVR image signal processor (ISP) core applications requiring stable component supply, consistent parametric performance, and long-term manufacturability support.

Supply support for NCP720BMT140TBG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP720BMT140TBG belongs to onsemi's VLDO regulator product line, engineered specifically for noise-sensitive, space-constrained portable electronics that demand dual-rail flexibility, ultra-low dropout, and guaranteed stability with minimal external components.

FAQ

What is the exact output voltage tolerance of the NCP720BMT140TBG over temperature?

The NCP720BMT140TBG provides ±2% output voltage accuracy across the full operating junction temperature range of −40°C to +125°C, with tighter ±0.5% tolerance at +25°C. This specification is verified under defined test conditions including VBIAS ≥ (VOUT + 1.4 V), VIN ≥ VOUT + 0.5 V, and load current from 0 to 350 mA - ensuring predictable performance in real-world thermal environments where the NCP720BMT140TBG is deployed.

Can the NCP720BMT140TBG operate with only the VIN supply and no separate VBIAS connection?

No - the NCP720BMT140TBG requires both VIN and VBIAS supplies to function. VBIAS powers all internal control circuitry including the voltage reference and error amplifier; without it, the device remains in undervoltage lockout (UVLO) and will not regulate. The minimum VBIAS is 1.6 V to exit UVLO, and stable operation requires VBIAS ≥ (1.40 V + 1.4 V) = 2.8 V per datasheet specifications for the NCP720BMT140TBG.

What is the recommended output capacitor for the NCP720BMT140TBG, and why is effective capacitance critical?

The NCP720BMT140TBG is stable with a 2.2 µF ceramic output capacitor, but the datasheet specifies "effective capacitance" - not nominal value - because ceramic capacitors lose capacitance under DC bias, especially at higher voltages and low temperatures. At 1.40 V output, a 2.2 µF X5R/X7R capacitor may deliver only ~1.3 µF effective capacitance at −40°C; thus, selecting a higher nominal value (e.g., 4.7 µF) or using multiple parallel capacitors ensures the required 2.2 µF effective value is maintained across all operating conditions for the NCP720BMT140TBG.

How does the enable (EN) pin behavior differ between active and shutdown states for the NCP720BMT140TBG?

When EN ≥ 1.1 V, the NCP720BMT140TBG regulates normally with 80 µA typical bias current. When EN ≤ 0.4 V, the device enters shutdown mode, disabling the output and reducing total ground current (IGND) to 0.5 µA typical. The EN pin includes internal hysteresis (VEN(HI) − VEN(LO) = 0.7 V), preventing oscillation near the threshold. If EN is unused, it must be tied to VIN or VBIAS - floating EN is not permitted per the NCP720BMT140TBG datasheet.

Does the NCP720BMT140TBG support adjustable output voltage via external feedback resistors?

No - the NCP720BMT140TBG is a fixed-output voltage regulator with factory-programmed 1.40 V. It has no feedback (FB) pin and no provision for external resistor dividers. All variants in the NCP720 family, including the NCP720BMT140TBG, are available only in discrete fixed-voltage options ranging from 1.00 V to 1.80 V, as confirmed in the Ordering Information table on page 8 of the datasheet.