onsemi NCP1117DTARK

Overview

NCP1117DTARK from onsemi is a 1.0 A low-dropout positive adjustable voltage regulator in DPAK package, delivering output voltage programmable from 1.25 V to 18.8 V with ±1.0% reference accuracy, 1.2 V max dropout at 800 mA, and thermal shutdown protection - used for post-regulation in switching power supplies and battery chargers.

For engineers reviewing the NCP1117DTARK datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal resistance (R_JA = 67 °C/W), output current limit (1.5 A typical), and compatibility with 10 µF input/output ceramic capacitors.

Technical Context

The NCP1117DTARK implements a floating three-terminal architecture with an internal 1.25 V bandgap reference, enabling precise output programming via external R1/R2 resistors. Its dropout behavior is linearly dependent on load current, maintaining regulation down to Vin − Vout = 1.20 V at 800 mA over temperature.

Internal protection includes foldback current limiting, safe operating area compensation, and thermal shutdown triggered at ~175 °C. It operates with up to 20 V input and requires no minimum load for regulation when configured as adjustable.

Key Specifications

Pinout & Package

DPAK package (Case 369C), surface-mount, with exposed metal tab thermally and electrically connected to Pin 2 (Output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM1117DT-ADJ/NOPB and TLV1117-ADJ, the NCP1117DTARK delivers superior output accuracy (±1.0% vs ±2.0%), lower dropout (1.2 V vs 1.3 V), and better thermal capability (67 vs 75–80 °C/W), making it preferred for industrial and automotive post-regulation where stability under load and temperature is critical.

Availability

NCP1117DTARK is available at Aetrix Electronics and suitable for switching power supply post-regulation, battery chargers, and hard drive controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP1117DTARK 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 specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and consumer markets.

The NCP1117 series was designed for high-reliability point-of-load regulation in systems demanding low dropout, tight output tolerance, and robust thermal protection - especially where legacy LM317 compatibility and DPAK thermal performance are required.

FAQ

What output voltage range does the NCP1117DTARK support?

The NCP1117DTARK supports an adjustable output voltage range from 1.25 V to 18.8 V, set by two external resistors (R1 and R2) per the formula V_OUT = 1.25 V × (1 + R2/R1) + I_ADJ × R2. Its internal 1.25 V reference is trimmed to ±1.0% accuracy, ensuring precise programmability across the full range.

Does the NCP1117DTARK require a minimum load current to maintain regulation?

No, the NCP1117DTARK does not require a minimum load current to maintain regulation when configured as an adjustable regulator. This eliminates the need for dummy loads or bleed resistors, simplifying designs for low-power or intermittent-use applications such as standby circuits or sensor nodes.

What is the maximum input voltage rating for the NCP1117DTARK?

The NCP1117DTARK has a maximum input voltage rating of 20 V, as specified in its Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable long-term use, input should remain ≤20 V, with sufficient margin to accommodate transients and ripple.

How is thermal performance characterized for the NCP1117DTARK in DPAK package?

The NCP1117DTARK in DPAK package has a thermal resistance of R_JA = 67 °C/W (minimum-size pad) and R_JC = 6.0 °C/W. Its internal thermal shutdown activates at ~175 °C junction temperature. Proper PCB copper area (e.g., ≥1 in² 2 oz. copper) is required to sustain 1 A output at ambient temperatures up to 50 °C.

Can the NCP1117DTARK replace the LM317 in existing designs?

Yes, the NCP1117DTARK is pin-compatible with the LM317 in DPAK footprint and offers improved performance: lower dropout (1.2 V vs 2–3 V), tighter reference accuracy (±1.0% vs ±2.5%), and integrated thermal shutdown. No PCB changes are needed, but output capacitor ESR requirements differ - verify stability with ≥4.7 µF output capacitance and 33 mΩ–2.2 Ω ESR.