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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi NCP585DSN28T1G

Name: NCP585DSN28T1G
Brand: onsemi
SKU: NCP585DSN28T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP585DSN28T1G

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SC-74A, SOT-753

Datasheet:: NCP585DSN28T1G.pdf

Description:: IC REG LINEAR 2.8V 300MA SOT23-5

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Product details

Overview

NCP585DSN28T1G from onsemi is a tri-mode 300 mA CMOS low-dropout (LDO) regulator with enable and auto-discharge functionality, designed for portable battery-powered systems requiring precise 2.8 V output, ultra-low quiescent current in LP mode (3.5 µA), and high PSRR (70 dB at 1 kHz). It operates across −40°C to +85°C and supports fast transient response and low-power operation via the ECO pin.

For engineers reviewing the NCP585DSN28T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (230 mV at 300 mA, V_OUT = 2.8 V), output accuracy (±2% in FT mode), mode-selectable quiescent current, and SOT23−5 package compatibility with space-constrained handheld instrumentation and camera power rails.

Technical Context

The NCP585DSN28T1G implements three operational modes-Chip Enable (CE), Fast Transient (FT), and Low Power (LP)-selected via the ECO pin: ECO = V_IN enables FT mode (I_Q = 60 µA, load regulation = 40 mV); ECO = GND activates LP mode (I_Q = 3.5 µA, accuracy = ±3%). Its internal fold-back protection limits output short-circuit current to 50 mA, and it features an active-high CE pin with 1.0 V threshold for reliable enable control.

Designed for stable operation with 1.0 µF tantalum output capacitance, the device maintains stability across load currents up to 300 mA without requiring external compensation. Its low temperature drift (100 ppm/°C) and excellent line regulation (0.01%/V in FT mode) ensure consistent 2.8 V output under varying input (1.4–6.0 V) and thermal conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8 V ±2% (FT mode), ±3% (LP mode) - ensures stable rail for 2.8 V logic or sensor interfaces
Max Output Current	300 mA - sufficient for powering microcontrollers, image sensors, or RF front-ends in portable devices
Dropout Voltage	230 mV at 300 mA (ECO = H) - enables operation with Vin as low as 3.03 V while maintaining regulation
Quiescent Current	3.5 µA (LP mode, V_OUT < 1.6 V) or 60 µA (FT mode, V_OUT = 2.8 V) - extends battery life in standby and active states
PSRR	70 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input
Operating Input Range	1.4 V to 6.0 V - compatible with single-cell Li-ion (3.0–4.2 V), LiFePO₄, or dual-cell alkaline inputs
Shutdown Current	0.1 µA - minimizes leakage when disabled via CE pin

Pinout & Package

SOT23−5 package (Case 1212), 2.8 mm × 2.5 mm footprint, 1.0–1.3 mm height, Pb-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 - Vin	Power input	Accepts 1.4–6.0 V supply; requires 1.0 µF ceramic decoupling to GND per layout guidelines
2 - GND	Ground reference	Common return path for input/output currents; must be low-impedance for PSRR and stability
3 - CE	Enable control	Active-high; drives regulator ON when ≥1.0 V, OFF when ≤0.3 V; enables system-level power sequencing
4 - ECO	Mode selection	FT mode when tied to Vin (60 µA I_Q); LP mode when grounded (3.5 µA I_Q) - configures trade-off between speed and efficiency
5 - Vout	Regulated output	Delivers stable 2.8 V ±2%; requires 1.0 µF low-ESR capacitor placed adjacent to pin for transient response

Key Features

Feature	Design Value
Tri-mode operation (CE/FT/LP)	Enables dynamic power-state adaptation: CE for on/off control, FT for performance-critical loads, LP for extended battery runtime
Ultra-low LP-mode I_Q	3.5 µA at V_OUT < 1.6 V - reduces no-load current drain by >95% vs. FT mode, critical for always-on sensors
Auto-discharge function	Internal N-channel MOSFET discharges V_OUT when CE = low - prevents floating outputs and ensures clean power-down sequencing
High PSRR (70 dB @ 1 kHz)	Rejects ripple from noisy switchers (e.g., buck converters), preserving signal integrity in analog/RF sections powered by V_OUT
Fold-back current limiting	Reduces short-circuit current to 50 mA - protects IC and source supply during fault conditions without thermal shutdown

Applications

Portable Medical Sensors	Industrial Handheld Scanners
Use Scenario: Battery-powered pulse oximeter with optical sensor and BLE radio operating intermittently over multi-day cycles. IC Role / Device Role / Timing Role: Primary 2.8 V power rail regulator supplying analog front-end and digital controller; manages transition between measurement (FT mode) and sleep (LP mode). Use Value: 3.5 µA LP-mode I_Q extends battery life beyond 7 days; 230 mV dropout allows use of partially discharged Li-ion cells down to 3.03 V.	Use Scenario: Ruggedized barcode scanner with laser diode driver, imager, and Wi-Fi module, deployed in warehouse environments. IC Role / Device Role / Timing Role: Local 2.8 V LDO for imager interface and Wi-Fi SoC I/O rail; ECO pin controlled by host MCU to optimize power during scan vs. idle. Use Value: 70 dB PSRR isolates imager analog signals from Wi-Fi switching noise; ±2% output accuracy ensures reliable level-shifting to 3.3 V logic.
Wearable Fitness Trackers	Smart Camera Modules
Use Scenario: Compact wrist-worn device with accelerometer, heart-rate monitor, and Bluetooth LE transceiver, constrained by 100 mm² PCB area. IC Role / Device Role / Timing Role: Single-chip 2.8 V regulator for sensor hub and BLE SoC; SOT23−5 footprint minimizes board space vs. larger packages. Use Value: 2.8 mm × 2.5 mm SOT23−5 package fits tight layouts; auto-discharge prevents residual V_OUT voltage from interfering with reset timing during wake-up.	Use Scenario: Embedded camera module in IoT security device, requiring clean 2.8 V for CMOS image sensor and ISP core. IC Role / Device Role / Timing Role: Dedicated LDO for image sensor analog supply; FT mode engaged during capture for fast load transient response (<10 µs settling). Use Value: 40 mV load regulation (FT mode) maintains <±0.14% V_OUT shift across 1–300 mA load steps, preventing image banding artifacts.

Portable Medical Sensors

Industrial Handheld Scanners

Use Scenario: Battery-powered pulse oximeter with optical sensor and BLE radio operating intermittently over multi-day cycles.

IC Role / Device Role / Timing Role: Primary 2.8 V power rail regulator supplying analog front-end and digital controller; manages transition between measurement (FT mode) and sleep (LP mode).

Use Value: 3.5 µA LP-mode I_Q extends battery life beyond 7 days; 230 mV dropout allows use of partially discharged Li-ion cells down to 3.03 V.

Use Scenario: Ruggedized barcode scanner with laser diode driver, imager, and Wi-Fi module, deployed in warehouse environments.

IC Role / Device Role / Timing Role: Local 2.8 V LDO for imager interface and Wi-Fi SoC I/O rail; ECO pin controlled by host MCU to optimize power during scan vs. idle.

Use Value: 70 dB PSRR isolates imager analog signals from Wi-Fi switching noise; ±2% output accuracy ensures reliable level-shifting to 3.3 V logic.

Wearable Fitness Trackers

Smart Camera Modules

Use Scenario: Compact wrist-worn device with accelerometer, heart-rate monitor, and Bluetooth LE transceiver, constrained by 100 mm² PCB area.

IC Role / Device Role / Timing Role: Single-chip 2.8 V regulator for sensor hub and BLE SoC; SOT23−5 footprint minimizes board space vs. larger packages.

Use Value: 2.8 mm × 2.5 mm SOT23−5 package fits tight layouts; auto-discharge prevents residual V_OUT voltage from interfering with reset timing during wake-up.

Use Scenario: Embedded camera module in IoT security device, requiring clean 2.8 V for CMOS image sensor and ISP core.

IC Role / Device Role / Timing Role: Dedicated LDO for image sensor analog supply; FT mode engaged during capture for fast load transient response (<10 µs settling).

Use Value: 40 mV load regulation (FT mode) maintains <±0.14% V_OUT shift across 1–300 mA load steps, preventing image banding artifacts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1826S-2802E/DB	Fixed 2.8 V, 300 mA, SOT23−5; higher I_Q (85 µA typical) and lower PSRR (60 dB @ 1 kHz); no LP/FT mode selection	Lacks tri-mode flexibility; suitable only for static low-noise applications without duty-cycled power states	Choose when mode-switching complexity is unnecessary and higher I_Q is acceptable for simpler BOMs
Torex XC6210B282MR-G	Fixed 2.8 V, 300 mA, SOT23−5; 1.0 µA I_Q (lower than NCP585DSN28T1G LP mode) but no auto-discharge or ECO-controlled modes	No auto-discharge or programmable modes; requires external discharge circuitry for clean power-down	Prefer when ultra-low I_Q dominates requirements and system design can accommodate external discharge

Compared with MCP1826S-2802E/DB and XC6210B282MR-G, the NCP585DSN28T1G uniquely integrates tri-mode operation, auto-discharge, and balanced PSRR/I_Q trade-offs - making it optimal for battery-powered systems requiring both long standby life and responsive active operation without added external components.

Availability

NCP585DSN28T1G is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld scanners, and wearable fitness trackers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP585DSN28T1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP585DSN28T1G belongs to the NCP585 series of tri-mode LDO regulators, engineered specifically for portable battery-powered equipment where dynamic power-state management, ultra-low quiescent current, and high ripple rejection are essential.

FAQ

What is the output voltage tolerance of the NCP585DSN28T1G in Fast Transient mode?

The NCP585DSN28T1G delivers a fixed 2.8 V output with ±2% tolerance in Fast Transient (FT) mode, verified across −40°C to +85°C ambient temperature and 1.0 mA to 300 mA load current. This accuracy ensures reliable interfacing with 2.8 V I/O standards and analog sensors without external trimming.

How does the ECO pin configure operating modes on the NCP585DSN28T1G?

The ECO pin on the NCP585DSN28T1G selects between Fast Transient (FT) and Low Power (LP) modes: connecting ECO to V_IN enables FT mode (60 µA I_Q, 40 mV load regulation); grounding ECO activates LP mode (3.5 µA I_Q, ±3% accuracy). The CE pin remains independent for on/off control in both modes.

What is the minimum input voltage required for the NCP585DSN28T1G to maintain regulation at 300 mA output?

To sustain 2.8 V output at 300 mA, the NCP585DSN28T1G requires a minimum input voltage of 3.03 V - calculated as V_OUT + V_DO = 2.8 V + 0.23 V - based on its typical dropout voltage of 230 mV in FT mode (ECO = V_IN). Below this, regulation is lost and V_OUT drops linearly with V_IN.

Does the NCP585DSN28T1G include reverse-current protection or output discharge capability?

Yes, the NCP585DSN28T1G incorporates an integrated N-channel MOSFET that actively discharges the output capacitor when the CE pin is driven low, ensuring rapid and controlled V_OUT decay. This auto-discharge function eliminates the need for external bleed resistors and supports clean power-down sequencing in systems like portable cameras and wearables.

What package type and footprint does the NCP585DSN28T1G use, and are there thermal considerations?

The NCP585DSN28T1G uses the SOT23−5 package (Case 1212), measuring 2.8 mm × 2.5 mm with a maximum height of 1.3 mm. Its thermal resistance θ_JA is 320°C/W; at 300 mA and 3.03 V input, power dissipation reaches ~70 mW, resulting in <22°C junction rise above ambient - well within the 125°C T_J(max) limit with standard PCB copper.

NCP585DSN28T1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.35V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 90 µA

Current - Supply (Max):: 111 µA

PSRR:: -

Control Features:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

NCP585DSN28T1G FAQ

1.How can I place an order for NCP585DSN28T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP585DSN28T1G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for NCP585DSN28T1G reliable?

The price and inventory of NCP585DSN28T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP585DSN28T1G is usually 5 days.

3.What payment methods are accepted for NCP585DSN28T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP585DSN28T1G transactions.

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4.How is shipping managed for NCP585DSN28T1G?

NCP585DSN28T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP585DSN28T1G order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for NCP585DSN28T1G?

For technical support, including NCP585DSN28T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP585DSN28T1G requirements.

6.How does Aetrix verify that NCP585DSN28T1G is sourced from the original manufacturer or authorized distributors?

All NCP585DSN28T1G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NCP585DSN28T1G meets industry standards.

7.What is the process for return or replacement of NCP585DSN28T1G?

All NCP585DSN28T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP585DSN28T1G, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The NCP585DSN28T1G part is unused and in its original packaging.

Return procedure for NCP585DSN28T1G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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