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

onsemi NCP585LSN09T1G

Name: NCP585LSN09T1G
Brand: onsemi
SKU: NCP585LSN09T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP585LSN09T1G

Manufacturer:: onsemi

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

Package:: SC-74A, SOT-753

Datasheet:: NCP585LSN09T1G.pdf

Description:: IC REG LINEAR 0.9V 300MA SOT23-5

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Product details

Overview

NCP585LSN09T1G from onsemi is a tri-mode 300 mA CMOS low-dropout (LDO) regulator with active-low enable, delivering fixed 0.9 V output in SOT-23−5 package. It supports Chip Enable (CE), Fast Transient (FT), and Low Power (LP) modes via the ECO pin, features 550 mV dropout at 300 mA, 2% output accuracy, and 70 dB PSRR at 1 kHz - optimized for battery-powered portable equipment requiring ultra-low quiescent current.

For engineers reviewing the NCP585LSN09T1G datasheet, pinout, applications, or equivalent options, key selection criteria include mode-selectable quiescent current (3.5 µA in LP mode), input voltage range (1.4–6.0 V), thermal stability (100 ppm/°C), and compatibility with 1.0 µF ceramic output capacitors in space-constrained handheld instrumentation.

Technical Context

The NCP585LSN09T1G implements a CMOS-based LDO architecture with internal bandgap reference, error amplifier, and pass transistor. Its tri-mode operation is controlled by the ECO pin: grounding ECO selects LP mode (3.5 µA I_q, 3% accuracy); connecting ECO to V_in enables FT mode (80 µA I_q, 2% accuracy, 40 mV load regulation).

It integrates fold-back current limiting, auto-discharge capability (in active-high variants only), and operates across −40°C to +85°C ambient. The device requires no external compensation and maintains stability with 1.0 µF ceramic output capacitance over full load range (1 mA–300 mA).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 0.9 V ±2% (FT mode), ±3% (LP mode) - ensures stable core supply for low-voltage microcontrollers and sensors.
Max Output Current	300 mA continuous - sufficient for powering SoCs, RF transceivers, or multi-rail PMIC subsystems.
Dropout Voltage	550 mV at 300 mA (ECO = V_in) - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (2.4 V min) sources.
Quiescent Current	3.5 µA (LP mode, V_out < 1.6 V) - extends battery life in always-on monitoring applications.
PSRR	70 dB at 1 kHz - suppresses switching noise from DC-DC converters feeding the LDO input.
Line Regulation	0.01%/V (FT mode) - minimizes output drift during battery discharge or input ripple.
Temp Coefficient	100 ppm/°C - guarantees <±1.5 mV output shift over −40°C to +85°C, critical for precision analog front-ends.

Pinout & Package

SOT-23−5 package (Case 1212), 2.8 mm × 2.5 mm footprint, 1.3 mm height, Pb-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1: Vin	Power input	Accepts 1.4–6.0 V; 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 PCB plane.
3: CE	Active-low chip enable	Pulled high internally; drives output OFF when logic low (<0.3 V), reducing shutdown current to 0.1 µA.
4: ECO	Mode selection control	Connect to GND for LP mode (ultra-low I_q); connect to V_in for FT mode (fast transient response).
5: Vout	Regulated output	Delivers 0.9 V ±2%; requires 1.0 µF ceramic capacitor placed adjacent to pin per stability requirements.

Key Features

Feature	Design Value
Tri-mode operation	Hardware-selectable CE/ECO logic enables trade-off between ultra-low I_q (3.5 µA) and dynamic performance (40 mV load regulation).
Low dropout voltage	550 mV @ 300 mA allows >90% efficiency at 0.9 V output from 1.5 V input - ideal for energy harvesting systems.
High PSRR	70 dB @ 1 kHz rejects noise from noisy switchers or digital ICs sharing same power rail.
Thermal stability	100 ppm/°C output drift ensures consistent ADC reference or sensor biasing across industrial temperature range.
Fold-back protection	Current limit reduces output short-circuit power dissipation, preventing thermal runaway in fault conditions.

Applications

Portable Medical Sensors	Wearable Health Monitors
Use Scenario: Continuous glucose monitor (CGM) with Bluetooth LE MCU and electrochemical sensor front-end. IC Role / Device Role / Timing Role: Primary 0.9 V supply for ultra-low-power ARM Cortex-M0+ MCU and analog signal chain. Use Value: LP mode's 3.5 µA quiescent current extends coin-cell battery life beyond 12 months while maintaining 2% output accuracy for ADC reference stability.	Use Scenario: Optical heart-rate sensor module in smartwatch with motion artifact cancellation. IC Role / Device Role / Timing Role: Dedicated LDO for photodiode transimpedance amplifier and LED driver bias rails. Use Value: 70 dB PSRR suppresses digital switching noise from display driver ICs, reducing optical measurement noise floor by >15 dB.
Handheld Test Equipment	Industrial IoT Edge Node
Use Scenario: Battery-operated multimeter with 16-bit SAR ADC and LCD display. IC Role / Device Role / Timing Role: Precision 0.9 V reference supply for ADC voltage reference buffer and analog front-end op-amps. Use Value: 100 ppm/°C tempco ensures <±0.5 LSB error over operating temperature, eliminating need for factory recalibration.	Use Scenario: LoRaWAN node with sub-GHz transceiver, environmental sensors, and deep-sleep wake-up controller. IC Role / Device Role / Timing Role: Always-on 0.9 V rail for real-time clock and wake-up comparator during 99.9% sleep duty cycle. Use Value: 0.1 µA shutdown current enables >10-year battery life on primary lithium thionyl chloride cell.

Portable Medical Sensors

Wearable Health Monitors

Use Scenario: Continuous glucose monitor (CGM) with Bluetooth LE MCU and electrochemical sensor front-end.

IC Role / Device Role / Timing Role: Primary 0.9 V supply for ultra-low-power ARM Cortex-M0+ MCU and analog signal chain.

Use Value: LP mode's 3.5 µA quiescent current extends coin-cell battery life beyond 12 months while maintaining 2% output accuracy for ADC reference stability.

Use Scenario: Optical heart-rate sensor module in smartwatch with motion artifact cancellation.

IC Role / Device Role / Timing Role: Dedicated LDO for photodiode transimpedance amplifier and LED driver bias rails.

Use Value: 70 dB PSRR suppresses digital switching noise from display driver ICs, reducing optical measurement noise floor by >15 dB.

Handheld Test Equipment

Industrial IoT Edge Node

Use Scenario: Battery-operated multimeter with 16-bit SAR ADC and LCD display.

IC Role / Device Role / Timing Role: Precision 0.9 V reference supply for ADC voltage reference buffer and analog front-end op-amps.

Use Value: 100 ppm/°C tempco ensures <±0.5 LSB error over operating temperature, eliminating need for factory recalibration.

Use Scenario: LoRaWAN node with sub-GHz transceiver, environmental sensors, and deep-sleep wake-up controller.

IC Role / Device Role / Timing Role: Always-on 0.9 V rail for real-time clock and wake-up comparator during 99.9% sleep duty cycle.

Use Value: 0.1 µA shutdown current enables >10-year battery life on primary lithium thionyl chloride cell.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-0902E/TT	Single-mode (fixed 0.9 V), 250 mA max, 6 µA I_q, no ECO pin or tri-mode control.	Lacks LP/FT mode switching; suitable only for static low-power use cases without dynamic load demands.	Select when design requires lowest possible BOM count and does not require adaptive quiescent current scaling.
Torex XC6209F092MR-G	200 mA max, 1 µA I_q (standby), no LP/FT mode distinction; uses CE-only control, no ECO pin.	Lower output current and no fast-transient optimization; better for ultra-long-life standby but not burst-mode sensing.	Choose for cost-sensitive, low-current applications where 300 mA headroom and 40 mV load regulation are unnecessary.

Compared with MCP1700T-0902E/TT and XC6209F092MR-G, the NCP585LSN09T1G uniquely delivers hardware-configurable tri-mode operation, enabling designers to optimize for either nanowatt standby (3.5 µA) or millisecond-scale load transient response (40 mV regulation) without firmware intervention or external logic.

Availability

NCP585LSN09T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable health monitors, handheld test equipment, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for NCP585LSN09T1G 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP585 series belongs to onsemi's precision LDO portfolio, designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, tight output tolerance, and robust transient response across wide temperature ranges.

FAQ

What is the maximum input voltage rating for the NCP585LSN09T1G?

The NCP585LSN09T1G has an absolute maximum input voltage of 6.5 V. However, the recommended operating input voltage range is 1.4 V to 6.0 V per electrical characteristics. Exceeding 6.5 V risks permanent damage due to junction breakdown, and operation below 1.4 V may prevent regulation at 0.9 V output under load.

How does the ECO pin affect the NCP585LSN09T1G's quiescent current and accuracy?

When the ECO pin is grounded, the NCP585LSN09T1G enters Low Power (LP) mode: quiescent current drops to 3.5 µA (for V_out < 1.6 V), but output accuracy degrades to ±3%. When ECO is tied to V_in, it enters Fast Transient (FT) mode: I_q rises to 80 µA, and accuracy improves to ±2%. This hardware-selectable trade-off is unique to the NCP585LSN09T1G.

Can the NCP585LSN09T1G be used with ceramic output capacitors?

Yes - the NCP585LSN09T1G is explicitly characterized and stable with 1.0 µF ceramic output capacitors, as confirmed in Figures 32–35 of the datasheet. Stability is maintained across full load (1–300 mA) and temperature (−40°C to +85°C) with ESR as low as 0.01 Ω. No tantalum or electrolytic capacitor is required.

What is the dropout voltage of the NCP585LSN09T1G at 300 mA output current?

The dropout voltage of the NCP585LSN09T1G is 550 mV at 300 mA output current when operating in FT mode (ECO = V_in). In LP mode (ECO = GND), dropout increases slightly to 590 mV. Both values are measured at V_out = 0.9 V and T_A = 25°C, per Table 1 in the datasheet.

Does the NCP585LSN09T1G include short-circuit protection?

Yes - the NCP585LSN09T1G incorporates fold-back current limiting. Under short-circuit conditions (V_out = 0 V), output current is limited to approximately 50 mA, reducing power dissipation and preventing thermal runaway. This behavior is specified in the Electrical Characteristics table under "Output Short Circuit Current".

NCP585LSN09T1G 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):: 0.9V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.8V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 90 µA

Current - Supply (Max):: 111 µA

PSRR:: 75dB ~ 65dB (120Hz ~ 10kHz)

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

NCP585LSN09T1G FAQ

1.How can I place an order for NCP585LSN09T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP585LSN09T1G 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 NCP585LSN09T1G reliable?

The price and inventory of NCP585LSN09T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP585LSN09T1G is usually 5 days.

3.What payment methods are accepted for NCP585LSN09T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP585LSN09T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP585LSN09T1G?

NCP585LSN09T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP585LSN09T1G 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 NCP585LSN09T1G?

For technical support, including NCP585LSN09T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP585LSN09T1G requirements.

6.How does Aetrix verify that NCP585LSN09T1G is sourced from the original manufacturer or authorized distributors?

All NCP585LSN09T1G 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 NCP585LSN09T1G meets industry standards.

7.What is the process for return or replacement of NCP585LSN09T1G?

All NCP585LSN09T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP585LSN09T1G, 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 NCP585LSN09T1G part is unused and in its original packaging.

Return procedure for NCP585LSN09T1G:

1.Submit a request within 90 days.

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

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