onsemi NCP1423DMR2G

Overview

NCP1423DMR2G from onsemi is a monolithic micropower synchronous boost DC-DC converter IC designed for battery-powered handheld electronics. It delivers up to 400 mA output at 3.3 V from 2.5 V input, integrates synchronous rectification to eliminate external Schottky diodes, features true-cutoff shutdown (isolating OUT from BAT), and includes ring-killer circuitry for DCM-mode ringing suppression.

For engineers reviewing the NCP1423DMR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 9.0 µA quiescent current, ±1.5% output voltage accuracy, 1.2 A cycle-by-cycle current limit, and Micro10 package compatibility with space-constrained portable designs.

Technical Context

The NCP1423DMR2G employs a PFM control scheme with fixed 0.5 V feedback threshold and internal 1.195 V reference, enabling precise output regulation across input voltages from 0.8 V to VOUT. Its dual-MOSFET synchronous rectifier (N-FET + P-FET) is controlled via ZLC comparator to prevent reverse current in DCM and minimize dead-time losses in CCM.

True-cutoff is implemented by disabling conduction paths between LX/BAT and OUT during EN-pin shutdown, reducing leakage to ≤0.5 µA. Integrated low-battery detection uses a 0.5 V threshold with 15 mV hysteresis on LBI/LBO pins, while auto-discharge (ADEN) activates a 100 Ω internal switch to discharge VOUT below 0.4 V post-shutdown.

Key Specifications

Pinout & Package

Package: Micro10 (Case 846B), 3.0 mm × 3.0 mm × 0.9 mm, Pb-free, RoHS-compliant surface-mount package with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with TPS61200DRCT and MAX1703EUT+T, the NCP1423DMR2G uniquely combines true-cutoff, ring-killer, auto-discharge, and dual-voltage programmability in a single Micro10 package - making it optimal for compact, feature-rich portable devices needing full autonomous power management.

Availability

NCP1423DMR2G is available at Aetrix Electronics and suitable for wireless headsets, internet audio players, and handheld instruments requiring stable component supply with long-term lifecycle assurance.

Supply support for NCP1423DMR2G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP1423DMR2G belongs to onsemi's micropower DC-DC converter product line, engineered specifically for ultra-low-quiescent-current, high-efficiency boost conversion in space-constrained battery-powered devices.

FAQ

What is the minimum input voltage required for NCP1423DMR2G to start switching?

The NCP1423DMR2G starts switching at a minimum input voltage of 0.85 V (typical) under standard test conditions. This allows reliable startup from single NiMH or NiCd cells even near end-of-life, and is confirmed in the Electrical Characteristics table (VIN_MIN = 0.85 V min). The device sustains regulation down to 0.8 V input once running, but startup requires ≥0.85 V to initialize internal circuitry. NCP1423DMR2G achieves this with optimized gate drive and low-threshold MOSFETs.

Does NCP1423DMR2G support adjustable output voltage, and how is it configured?

Yes, NCP1423DMR2G supports externally adjustable output voltage via a resistor divider on the FB pin. The output is set using VOUT = 0.5 V × (1 + R1/R2), where R2 is typically 100 kΩ and R1 is selected accordingly - e.g., 560 kΩ for 3.3 V. This configuration is validated in Figure 1 and Applications Information section. NCP1423DMR2G maintains ±1.5% accuracy over temperature and load, enabling precise rail generation for mixed-signal systems.

How does the True-Cutoff function work in NCP1423DMR2G, and what is its benefit?

NCP1423DMR2G implements True-Cutoff by fully blocking internal conduction paths between BAT, LX, and OUT when the EN pin is pulled below 0.5 V. This eliminates leakage through body diodes, reducing shutdown current to ≤0.5 µA (IBAT_SD). Unlike basic enable/disable, True-Cutoff isolates the battery from the output rail - critical for multi-year battery life in always-connected IoT sensors. NCP1423DMR2G achieves this with dedicated internal switches and control logic verified in the Functional Description.

What protection features are integrated into NCP1423DMR2G?

NCP1423DMR2G integrates five key protections: (1) Cycle-by-cycle current limit (1.2 A), (2) Overvoltage protection, (3) Thermal shutdown (145 °C), (4) Ring-killer for DCM ringing suppression, and (5) Low-battery detection with hysteresis. All are silicon-verified and documented in the Features and Electrical Characteristics sections. NCP1423DMR2G does not require external components to activate these - they operate autonomously during fault conditions.

Is NCP1423DMR2G still in active production, and what is its packaging format?

NCP1423DMR2G is available in tape-and-reel packaging (4000 units per reel) in the Pb-free Micro10 package (Case 846B). While the SCV1423DMR2G variant is marked discontinued in Revision 9 (Dec 2025), NCP1423DMR2G remains orderable and supported per onsemi's official documentation. Aetrix Electronics maintains active inventory and lifecycle coordination for NCP1423DMR2G to serve ongoing production needs.