onsemi NCP720BMT170TBG

Overview

NCP720BMT170TBG from onsemi is a 350 mA very low dropout (VLDO) CMOS voltage regulator with NMOS pass transistor and separate VBIAS supply, delivering 1.70 V fixed output with ±2% accuracy over −40°C to +125°C, 110 mV typical dropout at full load, and stable operation with 2.2 µF ceramic output capacitor - designed for noise-sensitive, space-constrained portable applications including smartphone core I/O rails.

For engineers reviewing the NCP720BMT170TBG datasheet, pinout, applications, or equivalent options, key selection criteria include dual-rail bias architecture, ultra-low bias current (80 µA typ), high PSRR (>65 dB at 1 kHz on VBIAS), thermal shutdown at +160°C, and WDFN6 2 mm × 2 mm package compatibility with high-density PCB layouts.

Technical Context

The NCP720BMT170TBG implements a dual-input VLDO architecture where VIN supplies the NMOS pass element while VBIAS powers internal control circuitry-including reference, error amplifier, and enable logic-enabling independent optimization of power path and bias stability. Its built-in soft-start ensures monotonic VOUT rise, limiting inrush current during startup.

It features two distinct dropout specifications: VIN–VOUT dropout (110 mV typ at 350 mA) and VBIAS–VOUT dropout (1.15 V min), both validated across temperature and load. Internal UVLO triggers at 1.6 V on VBIAS with 0.2 V hysteresis, and thermal shutdown activates at +160°C with automatic recovery at +140°C.

Key Specifications

Pinout & Package

Package: WDFN6 2 mm × 2 mm (Case 511BR), thermally enhanced with exposed pad soldered to ground plane for R_JA = 65°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output VLDO regulator applications.

Compared with TPS7A2025PDQNR and MCP1826T-1702E/DB, the NCP720BMT170TBG uniquely supports dual-rail biasing for superior PSRR and low-noise performance in battery-constrained portable electronics, while its 110 mV dropout and built-in soft-start deliver extended runtime and robust power sequencing without added components.

Availability

NCP720BMT170TBG is available at Aetrix Electronics and suitable for smartphone I/O regulation, tablet camera sensor powering, STB HDMI PHY supply, and portable DVR video encoding requiring stable component supply, consistent Pb-free WDFN6 packaging, and guaranteed 1.70 V output accuracy.

Supply support for NCP720BMT170TBG 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP720 series belongs to onsemi's precision low-dropout regulator product line, engineered specifically for noise-sensitive, space-constrained portable electronics requiring dual-rail biasing, ultra-low dropout, and guaranteed thermal robustness.

FAQ

What is the nominal output voltage of the NCP720BMT170TBG?

The NCP720BMT170TBG is factory-programmed for a fixed 1.70 V output voltage with ±2% accuracy over the full operating temperature range of −40°C to +125°C. This value is laser-trimmed during production and cannot be adjusted externally. The marking code "JQ" on the device confirms the 1.70 V variant per onsemi's ordering table.

Does the NCP720BMT170TBG require an external feedback resistor network?

No, the NCP720BMT170TBG does not require external feedback resistors. It is a fixed-output voltage regulator with the 1.70 V reference internally trimmed and stabilized. The device uses a dedicated VBIAS pin to power its internal reference and control circuitry, eliminating the need for external resistor dividers while maintaining high accuracy and PSRR performance.

What is the minimum recommended input voltage for the NCP720BMT170TBG to maintain regulation at 350 mA load?

To maintain regulation at 350 mA, the NCP720BMT170TBG requires VIN ≥ VOUT + VDO_IN = 1.70 V + 0.110 V = 1.81 V (typical). The datasheet specifies 110 mV typical dropout at full load, so a minimum of 1.81 V input ensures stable 1.70 V output. At worst-case (200 mV max dropout), VIN should be ≥ 1.90 V for guaranteed regulation across process and temperature.

Can the NCP720BMT170TBG operate with only the IN pin powered and VBIAS left unconnected?

No, the NCP720BMT170TBG cannot operate with VBIAS unconnected. The VBIAS pin supplies power to all internal control circuitry, including the voltage reference, error amplifier, and enable logic. If VBIAS is below UVLO threshold (1.6 V) or open, the device remains disabled regardless of IN or EN state. VBIAS must be supplied within 2.4 V–5.5 V for proper regulation.

Is the NCP720BMT170TBG pin-compatible with other variants in the NCP720 family?

Yes, all NCP720 variants-including NCP720BMT170TBG-share identical WDFN6 2 mm × 2 mm package (Case 511BR) and pinout: OUT, N/C, EN, BIAS, GND, IN. The only differences are factory-set output voltage (e.g., 1.20 V to 1.80 V) and top-side marking code (e.g., JQ for 1.70 V). This allows drop-in replacement across voltage options without PCB redesign.