onsemi NCP4680DSQ28T1G

Overview

NCP4680DSQ28T1G from onsemi is a 150 mA CMOS low-dropout linear voltage regulator in SC-70 package, delivering fixed 2.8 V output with ±1.0% accuracy, 0.25 V dropout at 150 mA, and 75 dB PSRR at 1 kHz - optimized for noise-sensitive power rails in portable communication equipment.

For engineers reviewing the NCP4680DSQ28T1G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 2.8 V output stability across −40°C to +85°C, chip-enable functionality for ultra-low standby current (≤1.0 µA), ceramic-capacitor compatibility (≥0.1 µF), and fold-back current protection for short-circuit resilience.

Technical Context

The NCP4680DSQ28T1G implements a CMOS-based LDO architecture with internal reference, error amplifier, and low-on-resistance N-channel pass transistor. Its enable-controlled operation supports active-high CE logic, and integrated output discharge (D-version) ensures rapid VOUT decay during shutdown.

Designed for battery-powered systems, it operates across 1.40 V to 5.25 V input while maintaining regulation down to 2.8 V + 0.25 V = 3.05 V minimum VIN. Line regulation is 0.02%/V typical, load regulation is ≤30 mV from 1 mA to 150 mA, and thermal performance is characterized with R_JA = 263°C/W in SC-70.

Key Specifications

Pinout & Package

Package: SC-70 (Case 419A−02), 5-pin, Pb-free, 1.8 mm × 1.35 mm footprint. Exposed pad not present; thermal path relies on PCB copper area under body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the NCP4680DSQ28T1G uniquely combines 150 mA capability, active-high CE, and integrated output discharge in SC-70 - enabling compact, battery-efficient, and hot-plug-safe designs where controlled power sequencing is critical.

Availability

NCP4680DSQ28T1G is available at Aetrix Electronics and suitable for wireless sensor nodes, USB-C peripheral power management, camera module biasing, and industrial HMI display subsystems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for NCP4680DSQ28T1G 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, and sensing technologies.

The NCP4680 series belongs to onsemi's precision LDO portfolio, engineered specifically for ultra-low-noise, low-quiescent-current regulation in space-constrained portable and industrial applications where reliability and thermal efficiency are paramount.

FAQ

What is the maximum input voltage rating for the NCP4680DSQ28T1G?

The absolute maximum input voltage for the NCP4680DSQ28T1G is 6.0 V. Operation above this level risks permanent damage. The recommended operating input range is 1.40 V to 5.25 V, ensuring proper regulation and thermal safety under all load and temperature conditions specified in the datasheet. Always include input overvoltage protection if upstream sources may exceed 5.25 V.

Does the NCP4680DSQ28T1G require an external resistor divider for output voltage setting?

No, the NCP4680DSQ28T1G is a fixed-output regulator with internally trimmed 2.8 V reference - no external resistors are needed or supported. This simplifies layout, improves accuracy (±1.0% over temperature), and eliminates drift from resistor tolerances or thermal coefficients. All variants in the NCP4680 family use factory-set outputs.

How does the auto-discharge feature of the NCP4680DSQ28T1G operate?

When the CE pin is driven low, the NCP4680DSQ28T1G activates an internal NMOS transistor between VOUT and GND, discharging the output capacitor rapidly. This prevents back-powering of upstream circuitry during hot-plug events or system reset sequences. Discharge time depends on C_OUT value but typically falls below 100 µs for 1 µF ceramic capacitors.

Can the NCP4680DSQ28T1G be used with tantalum output capacitors?

No - the NCP4680DSQ28T1G is optimized for ceramic capacitors ≥0.1 µF and becomes unstable with high-ESR tantalum capacitors. Using tantalum may cause oscillation or poor transient response due to insufficient phase margin. If bulk capacitance is required, place a low-ESR ceramic capacitor (e.g., 10 µF X5R) in parallel with the mandatory 0.1 µF ceramic decoupling cap.

What is the thermal resistance (R_JA) of the NCP4680DSQ28T1G in its SC-70 package?

The junction-to-air thermal resistance (R_JA) for the NCP4680DSQ28T1G in SC-70 package is 263°C/W, measured under standard JEDEC test conditions (1s² pad, 1 oz Cu). Real-world PCB layout - especially copper area connected to pins 2 (GND) and 4 (VIN) - can reduce effective R_JA by 30–50%. Derate power dissipation accordingly for ambient temperatures above 25°C.