onsemi NCP170AXV135T2G

Overview

NCP170AXV135T2G from onsemi is a CMOS ultra-low IQ LDO regulator delivering 150 mA output with 1.35 V fixed output voltage, 500 nA typical quiescent current, 170 mV typical dropout at full load, ±1% output accuracy, and stable operation with 1 µF ceramic capacitors. It serves as a primary power rail for low-power microcontrollers and image sensors in battery-powered portable devices.

For engineers reviewing the NCP170AXV135T2G datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low standby current, thermal shutdown behavior, EN pin logic thresholds, dropout performance at 150 mA, and compatibility with 1 µF input/output ceramics in space-constrained layouts.

Technical Context

The NCP170AXV135T2G integrates a PMOS pass transistor enabling ultra-low dropout and near-zero gate drive current, supporting operation down to 2.2 V input while maintaining regulation at 1.35 V output. Its internal bandgap reference and error amplifier deliver ±1% initial accuracy and <0.2%/V line regulation over 2.2–5.5 V input range.

It features active-high enable (EN) with 1.2 V turn-on threshold and 0.4 V turn-off threshold, thermal shutdown at 175 °C with 25 °C hysteresis, and over-current protection limiting short-circuit current to 225 mA. The device lacks active discharge (NCP170A variant includes R_LOW = 100 Ω; this part is NCP170X, not A).

Key Specifications

Pinout & Package

Package: XDFN4 (1 mm × 1 mm, 0.4 mm height), case 711AJ, moisture sensitivity level 1 (MSL1). Exposed pad internally connected to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1302E/MB and XC6206P132MR-G, the NCP170AXV135T2G provides tighter output voltage (1.35 V ±1%), lower quiescent current (500 nA vs. µA-range), integrated thermal shutdown, and an enable pin-making it superior for high-precision, ultra-low-power, thermally constrained designs.

Availability

NCP170AXV135T2G is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, smart camera modules, and industrial wireless transmitters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for NCP170AXV135T2G 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 NCP170 series is designed for ultra-low-power portable electronics, emphasizing nanoscale quiescent current, small-footprint packaging, and robustness in battery-constrained environments.

FAQ

What is the output voltage tolerance of the NCP170AXV135T2G over temperature?

The NCP170AXV135T2G maintains ±1% output voltage accuracy across the full operating junction temperature range of −40°C to +85°C. At +25°C, the output is tightly specified at 1.35 V ±12 mV (1.338 V to 1.362 V); over temperature, it remains within 1.3365 V to 1.3635 V, ensuring reliable operation for precision analog circuits without external trimming.

Does the NCP170AXV135T2G include active output discharge?

No, the NCP170AXV135T2G does not include active output discharge. The "X" suffix denotes the standard version without the active discharge feature (which is present only in NCP170A variants, e.g., NCP170AMX135T2G). When EN is pulled low, the output floats; an external pull-down resistor is required if rapid discharge is needed.

What is the minimum input voltage required for regulation at full 150 mA load?

The minimum input voltage for regulation at 150 mA is calculated as V_OUT + V_DO = 1.35 V + 170 mV = 1.52 V. However, the absolute minimum rated input is 2.2 V per datasheet specifications. Operation below 2.2 V is not guaranteed and may result in loss of regulation, reduced PSRR, or undefined behavior-even if dropout voltage appears sufficient.

Can the NCP170AXV135T2G be used with 0.47 µF ceramic output capacitors?

No-stability is guaranteed only with ≥1 µF ceramic output capacitance (X5R/X7R, ≤100 mΩ ESR). Using 0.47 µF violates the minimum C_OUT requirement and risks oscillation or poor transient response. The datasheet explicitly specifies 1.0 µF as the minimum for all operating conditions, including full 150 mA load and −40°C to +85°C temperature range.

How does the EN pin behave during power-up and brown-out conditions?

The EN pin has a 1.2 V turn-on threshold and 0.4 V turn-off threshold with hysteresis. During power-up, the device remains off until VIN exceeds ~2.2 V *and* EN reaches ≥1.2 V. During brown-out, it disables cleanly when EN falls below 0.4 V-drawing only 100 nA standby current-preventing erratic MCU resets caused by marginal enable signals.