onsemi NCP1400ASN30T1G

Overview

NCP1400ASN30T1G from onsemi is a micropower fixed-frequency PWM step-up DC-DC switching regulator designed for low-voltage battery-powered portable electronics. It starts up at 0.8 V, operates down to 0.2 V, delivers up to 100 mA output current at 3.0 V, and integrates oscillator, PWM controller, error amplifier, soft-start, and power MOSFET in TSOP-5 package - enabling compact boost converters for white LED torch lights and handheld instruments.

For engineers reviewing the NCP1400ASN30T1G datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage (0.8 V), regulated 3.0 V output with ±2.5% accuracy, 180 kHz switching frequency, CE-controlled enable/disable, and discontinuous conduction mode stability with only four external components.

Technical Context

The NCP1400ASN30T1G implements a voltage-mode PWM control architecture with an internal 180 kHz oscillator (±20% tolerance, 0.11%/°C tempco) and phase-compensated error amplifier optimized for stable operation in discontinuous conduction mode. Its integrated power switch features cycle-by-cycle current limiting (typ. 350 mA peak) and LX voltage clamping (0.65–1.0 V).

Startup and hold behavior is defined by dedicated thresholds: minimum startup voltage is 0.8 V (with −1.6 mV/°C tempco), and minimum hold voltage is 0.3 V. The chip enable (CE) pin supports three-state logic: ≥0.9 V enables regulation, ≤0.3 V disables (reducing quiescent current to 0.6 µA), and floating defaults to enabled via internal 150 nA pull-up.

Key Specifications

Pinout & Package

TSOP-5 package (Case 483), 3.0 mm × 1.5 mm × 1.0 mm height, Pb-free, RoHS compliant, with exposed thermal pad (not electrically connected). Pin 3 is NC (no internal connection); pin 2 serves as both output voltage monitor and device power supply (OUT).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up regulator applications.

Compared with TPS61022DRVR and MAX17222ELT+T, the NCP1400ASN30T1G offers the lowest BOM count (no feedback resistors), tightest output voltage accuracy (±2.5%), and lowest shutdown current (0.6 µA), making it optimal for cost-sensitive, long-life, single-output portable systems where 100 mA and 180 kHz are sufficient.

Availability

NCP1400ASN30T1G is available at Aetrix Electronics and suitable for white LED torch lights, handheld instruments, and personal digital assistants requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.

Supply support for NCP1400ASN30T1G 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 focused on energy-efficient electronics, with leadership in power management, analog, sensor, and connectivity solutions.

The NCP1400A series belongs to onsemi's micropower DC-DC converter product line, engineered specifically for ultra-low-voltage battery-powered portable devices where startup capability below 1.0 V and minimal quiescent current are essential.

FAQ

What is the minimum input voltage required for NCP1400ASN30T1G to start regulating?

The NCP1400ASN30T1G has a guaranteed maximum startup voltage of 0.95 V at 25°C, with typical value 0.8 V. It can initiate regulation from a single depleted alkaline or NiMH cell. Startup voltage increases slightly at lower temperatures (−1.6 mV/°C tempco), so designs for −40°C operation should verify margin with 0.8 V input under worst-case conditions. The NCP1400ASN30T1G remains operational down to 0.2 V input once started.

Can NCP1400ASN30T1G be used without an external feedback resistor network?

Yes - the NCP1400ASN30T1G integrates a factory-trimmed feedback resistor network to deliver a precise 3.0 V output. No external resistors are required, reducing BOM count and PCB area. This fixed-output architecture eliminates resistor tolerance errors and temperature drift effects that affect adjustable regulators. The NCP1400ASN30T1G achieves ±2.5% output accuracy over temperature and load.

How does the CE pin function on NCP1400ASN30T1G, and what happens if left floating?

The CE pin on NCP1400ASN30T1G controls enable/disable: ≥0.9 V enables regulation, ≤0.3 V disables (reducing current to 0.6 µA), and floating defaults to enabled via internal 150 nA pull-up to the OUT pin. Leaving CE floating is a valid design choice for always-on applications. Applying 0.3–0.9 V must be avoided, as it places the NCP1400ASN30T1G in an undefined state with potential excessive current draw.

What is the recommended inductor value for NCP1400ASN30T1G in a standard 3.0 V output design?

onsemi recommends 22 µH for the NCP1400ASN30T1G, as validated in Figures 3–7 and the evaluation board (Figure 44). Inductors between 18 µH and 27 µH are acceptable; lower values increase peak current and output capability but reduce efficiency, while higher values improve efficiency at light loads. Use low-DCR (<1.0 Ω) shielded inductors rated for ≥350 mA saturation current. The NCP1400ASN30T1G's discontinuous mode operation makes inductor selection less critical than in continuous-mode regulators.

Does NCP1400ASN30T1G require external compensation components?

No - the NCP1400ASN30T1G includes an internal phase-compensated error amplifier optimized for stable operation in discontinuous conduction mode across its full input/output voltage and load range. External compensation components are not needed, simplifying design and reducing bill-of-materials. Stability is not guaranteed in continuous conduction mode, so inductor selection must ensure DCM operation per onsemi's design equations in the datasheet.