onsemi NCP171AMX165160TCG

Overview

NCP171AMX165160TCG from onsemi is an ultra-low-quiescent-current dual-mode LDO regulator delivering 80 mA in Active Mode and consuming only 50 nA in Low Power Mode. It features factory-programmed 160 mV output voltage offset in Low Power Mode (vs. 1.65 V nominal Active Mode output), operates from 1.7 V to 5.5 V input, and is packaged in a 1.2 mm × 1.2 mm XDFN4. It enables extended battery life in always-on IoT sensor nodes.

For engineers reviewing the NCP171AMX165160TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its 50 nA low-power I_Q, 160 mV programmable voltage scaling, ECO pin-controlled mode switching, ±2% output accuracy in Active Mode, and thermal shutdown with 165°C trip point.

Technical Context

The NCP171AMX165160TCG implements a dual-path internal architecture: one optimized for high PSRR (65 dB @ 1 kHz) and fast transient response in Active Mode, and another minimizing bias current for ultra-low I_Q in Low Power Mode. Mode selection is controlled externally via the ECO pin, with defined threshold voltages (VECO_L = 0.2 V, VECO_H = 0.5 V).

It integrates active output discharge (R_DS(on) ≈ 50 Ω), overcurrent protection (140–170 mA limit in Active Mode), and thermal shutdown with 20°C hysteresis. The device defaults to Active Mode at startup for stable capacitor charging, enforcing ~35 ms of guaranteed Active operation before honoring ECO state.

Key Specifications

Pinout & Package

Package: XDFN4, 1.2 mm × 1.2 mm, 0.4 mm height, exposed thermal pad (Pin 5/EP = GND). RoHS-compliant, halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with the NCP171AMX165160TCG, the XC6216D165MR-G offers lower cost but forfeits dynamic power optimization, while the RP111N165D-TR-F matches I_Q but lacks integrated voltage scaling-making the NCP171AMX165160TCG uniquely suited for systems requiring both ultra-low sleep current and adaptive voltage domains.

Availability

NCP171AMX165160TCG is available at Aetrix Electronics and suitable for wearable health monitors, smart meter sensor nodes, industrial wireless sensors, asset tracking beacons, and other long-life battery-powered applications requiring stable component supply and guaranteed long-term availability.

Supply support for NCP171AMX165160TCG 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 NCP171AMX165160TCG belongs to onsemi's SLIQ (Super Low I_Q) LDO family, engineered specifically for battery-constrained edge devices demanding nanowatt-level standby power without sacrificing active-mode performance.

FAQ

What is the factory-programmed output voltage offset for NCP171AMX165160TCG?

The NCP171AMX165160TCG is factory-programmed with a 160 mV output voltage offset in Low Power Mode relative to its 1.65 V nominal Active Mode output, resulting in 1.49 V regulation during sleep. This value is fixed per unit and cannot be adjusted in-circuit; it is confirmed in Table 4 of the datasheet under "Offset" and referenced in the ordering code suffix "160".

How does the ECO pin function on NCP171AMX165160TCG?

The ECO pin on NCP171AMX165160TCG controls mode selection: pulling ECO to GND (<0.2 V) activates Low Power Mode (50 nA I_Q, 5 mA max), while driving it to ≥0.5 V selects Active Mode (80 mA, 65 dB PSRR). The pin has defined thresholds (VECO_L = 0.2 V, VECO_H = 0.5 V) and is not rail-to-rail - direct connection to V_OUT is recommended for reliable high assertion.

What is the maximum input voltage rating for NCP171AMX165160TCG?

The absolute maximum input voltage for NCP171AMX165160TCG is 6.0 V, as specified in Table 2 (Absolute Maximum Ratings). Operation above this level risks permanent damage. For reliable long-term use, the recommended operating input range remains 1.7 V to 5.5 V per Table 4, ensuring proper dropout behavior and thermal margin across all load and temperature conditions.

Does NCP171AMX165160TCG include thermal protection?

Yes, NCP171AMX165160TCG integrates thermal shutdown with a trip point of 165°C (typical) and 20°C hysteresis, as documented in Table 4. When junction temperature exceeds this threshold, the regulator disables output and remains off until temperature falls below ~145°C. This protection operates independently of ENA and ECO states and is guaranteed by design per Note 8 in the datasheet.

Can NCP171AMX165160TCG be used without connecting the ENA pin?

Yes, NCP171AMX165160TCG can operate with ENA tied directly to IN (VIN), which ensures continuous enablement. The ENA pin is not required for basic functionality - it provides optional system-level shutdown capability. When unused, connecting ENA to VIN avoids floating input and guarantees the regulator remains active, matching the default startup behavior described in the APPLICATION INFORMATION section.