onsemi NCP1400ASN19T1G

Overview

NCP1400ASN19T1G from onsemi is a micropower fixed-frequency PWM step-up DC-DC switching regulator designed for ultra-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, regulates to 1.9 V ±2.5%, and switches at 180 kHz - enabling compact, efficient boost conversion in space-constrained handheld devices.

For engineers reviewing the NCP1400ASN19T1G datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage margin under aging batteries, discontinuous-mode stability with minimal external components, CE-controlled shutdown for system-level power management, and TSOP-5 footprint compatibility in high-density PCB layouts.

Technical Context

The NCP1400ASN19T1G implements a voltage-mode PWM control architecture with an integrated 180 kHz oscillator, phase-compensated error amplifier, soft-start circuit, and current-limited MOSFET switch. Its internal feedback network is trimmed for 1.9 V output, and it operates exclusively in discontinuous conduction mode (DCM) to ensure stability across full input (0.2–1.5 V) and load (0–100 mA) ranges.

Startup and hold behavior is defined by dedicated thresholds: minimum startup voltage is 0.8 V (typ), decreasing by −1.6 mV/°C over temperature; minimum hold voltage is 0.3 V (min). The CE pin enables/disable logic via 0.9 V high threshold and 0.3 V low threshold, with internal 150 nA pull-up to OUT - allowing floating-pin enable operation.

Key Specifications

Pinout & Package

Package: TSOP-5 (Case 483), Pb-free, 3.0 mm × 1.5 mm footprint with 0.95 mm pitch and 0.25–0.50 mm lead thickness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61022DRVR and MAX77801EWA+T, the NCP1400ASN19T1G provides the lowest component count (only 4 external parts), smallest footprint (TSOP-5), and lowest quiescent current for fixed 1.9 V output - making it optimal for cost-sensitive, space-constrained, single-cell battery applications where 100 mA is sufficient.

Availability

NCP1400ASN19T1G is available at Aetrix Electronics and suitable for cellular telephones, digital cameras, and handheld instruments requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.

Supply support for NCP1400ASN19T1G 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, high-performance silicon solutions for automotive, industrial, cloud, medical, and edge applications.

The NCP1400A series belongs to onsemi's micropower DC-DC converter product line, engineered specifically for ultra-low-voltage battery-powered portable electronics where startup reliability, minimal external components, and extended battery life are critical design requirements.

FAQ

What is the minimum input voltage required for NCP1400ASN19T1G to start up?

The NCP1400ASN19T1G has a typical minimum startup voltage of 0.8 V, with a maximum of 0.95 V across temperature. This allows reliable operation from nearly depleted single-cell batteries. Startup voltage decreases by −1.6 mV/°C over −40°C to +85°C ambient, so designs must verify margin at worst-case temperature and battery age. The NCP1400ASN19T1G achieves this with an optimized internal oscillator and low-threshold comparator circuitry.

Can NCP1400ASN19T1G operate with an input voltage below 0.8 V?

Yes - the NCP1400ASN19T1G can sustain regulation down to a minimum hold voltage of 0.3 V (min), even after startup. Once running, it continues switching and regulating as input drops from 0.8 V to 0.2 V (typ), enabling full utilization of battery capacity. This behavior is confirmed in Figure 26 of the datasheet and is enabled by adaptive duty-cycle extension and low-quiescent-current biasing in the NCP1400ASN19T1G core.

What external components are required for basic NCP1400ASN19T1G operation?

The NCP1400ASN19T1G requires only four external components: a 22 µH power inductor (e.g., Sumida CR54-220MC), a Schottky diode (e.g., MBR0520LT1), a 10 µF input capacitor (e.g., KEMET T491C106K016AS), and a 68 µF low-ESR output capacitor (e.g., KEMET T494D686K010AS). No feedback resistors or compensation networks are needed - all are integrated into the NCP1400ASN19T1G die.

How does the CE pin function on NCP1400ASN19T1G?

The CE pin on NCP1400ASN19T1G controls enable/disable: ≥0.9 V enables normal operation; ≤0.3 V disables the regulator, reducing current draw to 0.6 µA (typ); floating enables the device via an internal 150 nA pull-up to the OUT pin. Applying 0.3–0.9 V places the NCP1400ASN19T1G in an undefined state and must be avoided. This logic is implemented with precision comparators inside the NCP1400ASN19T1G.

Is NCP1400ASN19T1G compatible with discontinuous conduction mode (DCM) only?

Yes - the NCP1400ASN19T1G is explicitly designed for stable operation in discontinuous conduction mode (DCM) across its full input (0.2–1.5 V) and output load (0–100 mA) range. Its internal phase-compensated error amplifier and fixed-frequency PWM controller guarantee stability without external compensation. Continuous conduction mode (CCM) is not supported and may cause instability or erratic behavior in the NCP1400ASN19T1G.