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onsemi NCP1400ASN27T1
- Part No.:
- NCP1400ASN27T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1400ASN27T1.pdf
- Description:
- IC REG BOOST 2.7V 100MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,670
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Product details
Overview
NCP1400ASN27T1 from onsemi is a micropower fixed-frequency PWM step-up DC-DC switching regulator designed for ultra-low-voltage battery-powered portable devices. It starts up at 0.8 V, operates down to 0.2 V, delivers up to 100 mA output current at 2.7 V, and integrates oscillator, PWM controller, error amplifier, soft-start, and power MOSFET in TSOP-5 package. It powers white LED torch lights and low-power handheld instruments.
For engineers reviewing the NCP1400ASN27T1 datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage (0.8 V), output regulation accuracy (±2.5%), quiescent current (32 µA at 2.7 V), CE-controlled shutdown (0.6 µA off-state), and discontinuous-mode stability with only four external components.
Technical Context
The NCP1400ASN27T1 implements a voltage-mode PWM boost architecture operating at a fixed 180 kHz switching frequency with ±20% tolerance and 0.11%/°C temperature coefficient. Its internal phase-compensated error amplifier ensures stable regulation in discontinuous conduction mode across input voltages from 0.2 V to 2.0 V and load currents up to 100 mA.
It features cycle-by-cycle current limiting (typ. 350 mA peak), an integrated 150 nA CE pull-up, and a VLX limiter that clamps LX voltage to 0.65–1.0 V. The device uses an internal feedback resistor network trimmed for 2.7 V ±2.5% output, with soft-start ramping output to ~1.5 V before closed-loop regulation begins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.7 V ±2.5% - factory-trimmed internal feedback enables precise, stable rail without external resistors. |
| Startup Voltage | 0.8 V typ. - enables operation from single alkaline or NiMH cell at end-of-life. |
| Switching Frequency | 180 kHz ±20% - fixed-frequency PWM enables predictable EMI filtering and compact magnetics. |
| Max Output Current | 100 mA - sufficient for driving white LEDs or powering microcontroller peripherals in portable gear. |
| Quiescent Current | 32 µA typ. at 2.7 V - minimizes battery drain during active operation in always-on subsystems. |
| Off-State Current | 0.6 µA typ. - achieved via CE pin disable, extending shelf life of battery-powered devices. |
| Operating Temp Range | −40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: TSOP-5 (Case 483), 3.0 mm × 1.5 mm × 1.0 mm profile, Pb-free/RoHS compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable control input | Logic-high ≥0.9 V enables regulator; ≤0.3 V disables it; floating defaults to enabled via internal 150 nA pull-up to OUT. |
| 2 - OUT | Regulated output & IC power supply | Provides 2.7 V output and powers internal circuitry; must be decoupled with ≥10 µF low-ESR capacitor. |
| 3 - NC | No internal connection | Not bonded; must remain unconnected to avoid parasitic coupling or mechanical stress. |
| 4 - GND | Power and signal reference ground | Single-point grounding required with C1, C2, and LX return paths to minimize noise and ground bounce. |
| 5 - LX | Switch node for external inductor | Connects to inductor's SW side; carries pulsed current up to 350 mA peak; requires short, low-inductance PCB trace. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables reliable boot from depleted single-cell batteries, critical for long-life portable designs. |
| Integrated soft-start | Ramps output to ~1.5 V before regulation engages, preventing inrush current and improving startup under heavy loads. |
| Discontinuous-mode stability | On-chip phase compensation eliminates need for external compensation components across full load and input range. |
| Low-noise fixed-frequency PWM | 180 kHz operation simplifies EMI filter design and avoids audible noise in sensitive audio or sensor applications. |
| CE-controlled ultra-low shutdown | 0.6 µA off-state current preserves battery capacity during storage or standby modes in IoT endpoints. |
Applications
| White LED Torch Light | Handheld Instrument Power |
|---|---|
Use Scenario: Compact flashlight powered by single AA/AAA battery with runtime optimization. IC Role / Device Role / Timing Role: Step-up regulator generating stable 2.7 V from 0.8–1.5 V input to drive high-brightness white LEDs. Use Value: Enables >100 mA LED current even at battery voltages below 1.0 V, extending usable runtime by 30–40% versus linear solutions. | Use Scenario: Portable multimeter or data logger requiring regulated 2.7 V for ADC and display backlight. IC Role / Device Role / Timing Role: Primary DC-DC converter supplying clean, low-noise 2.7 V rail from primary battery source. Use Value: Delivers 2.7 V ±2.5% accuracy over −40°C to +85°C, ensuring measurement integrity without recalibration. |
| Personal Digital Assistant (PDA) | Electronic Game Console |
Use Scenario: Legacy PDA with monochrome LCD and flash memory requiring efficient 2.7 V bias. IC Role / Device Role / Timing Role: Micropower boost converter powering system logic and memory interface rails. Use Value: 32 µA quiescent current extends battery life between sync sessions; CE pin allows software-controlled power gating. | Use Scenario: Handheld gaming device with OLED display and audio codec needing stable 2.7 V supply. IC Role / Device Role / Timing Role: Secondary power rail generator supporting display driver and audio subsystem. Use Value: Fixed 180 kHz switching avoids beat frequencies with display refresh rates, eliminating visible flicker or audio artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61022DRVR | Higher 2.0 A switch current, 2.5 MHz switching, wider 0.3–5.5 V input range; requires external feedback resistors. | Better suited for higher-current loads (>200 mA) and space-constrained layouts due to smaller inductor size. | Select when >100 mA output or >1 MHz switching is required; not drop-in due to different pinout and external resistor dependency. |
| MAX17222ELT+T | Lower 0.35 V startup, 500 mA switch current, 1.2 MHz, ±1.5% output accuracy; includes true shutdown (nSHDN). | Preferred for ultra-low-power IoT sensors where sub-0.5 V startup and <1 µA shutdown current are mandatory. | Choose for extreme low-voltage operation or tighter regulation; requires layout revision due to different pin assignment and enable polarity. |
Compared with TPS61022DRVR and MAX17222ELT+T, the NCP1400ASN27T1 offers lowest BOM count (no external resistors), smallest footprint (TSOP-5), and optimal balance of ultra-low startup voltage and micropower efficiency for cost-sensitive, battery-limited portable systems.
Availability
NCP1400ASN27T1 is available at Aetrix Electronics and suitable for white LED torch lights, handheld instruments, PDAs, and electronic game consoles requiring stable component supply with guaranteed long-term manufacturability.
Supply support for NCP1400ASN27T1 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 manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP1400ASN27T1 belongs to the NCP1400A micropower step-up regulator family, engineered specifically for ultra-low-voltage battery-powered portable electronics where minimal component count, extended runtime, and robust cold-temperature operation are essential.
FAQ
What is the minimum input voltage required for NCP1400ASN27T1 to start regulating?
The NCP1400ASN27T1 has a typical minimum startup voltage of 0.8 V, allowing it to begin regulation from a nearly depleted single-cell alkaline or NiMH battery. This value is confirmed in the Electrical Characteristics table (Vstart = 0.8 V typ.) and validated across temperature in Figure 20. Below this threshold, the device remains inactive until input rises above 0.8 V.
Does NCP1400ASN27T1 require external feedback resistors to set its 2.7 V output?
No, the NCP1400ASN27T1 does not require external feedback resistors. Its 2.7 V output is set by an internal trimmed resistor network, as stated in the "Regulated Converter Voltage (VOUT)" section and confirmed in the Ordering Information table where "NCP1400ASN27T1G" maps to 2.7 V output. This eliminates two external components and improves accuracy and temperature stability.
How does the CE pin function on NCP1400ASN27T1, and what happens if left floating?
The CE pin on NCP1400ASN27T1 enables or disables the regulator: ≥0.9 V enables, ≤0.3 V disables. If left floating, the internal 150 nA pull-up current source connects CE to the OUT pin, resulting in automatic enablement. This default behavior simplifies designs where continuous operation is desired without additional pull-up circuitry.
What is the maximum recommended output current for NCP1400ASN27T1 at 2.7 V output?
The NCP1400ASN27T1 supports up to 100 mA of continuous output current at 2.7 V, as specified in the device overview and confirmed in the Electrical Characteristics table under "LX Pin On-State Sink Current" (ILX = 100 mA min for suffix 27T1). Performance beyond this limit risks thermal overload or regulation loss, especially at elevated ambient temperatures.
Can NCP1400ASN27T1 operate in continuous conduction mode (CCM)?
No, the NCP1400ASN27T1 is explicitly designed for discontinuous conduction mode (DCM) operation. The datasheet states in the "Compensation" section: "Stability cannot be guaranteed in continuous conduction mode." Its internal compensation network and current-limiting architecture are optimized for DCM, and using it in CCM may result in instability or erratic regulation.
NCP1400ASN27T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 2.7V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA (Switch)
- Frequency - Switching:
- 180kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP1400ASN27T1 FAQ
1.How can I place an order for NCP1400ASN27T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1400ASN27T1 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 NCP1400ASN27T1 reliable?
The price and inventory of NCP1400ASN27T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1400ASN27T1 is usually 5 days.
3.What payment methods are accepted for NCP1400ASN27T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1400ASN27T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1400ASN27T1?
NCP1400ASN27T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1400ASN27T1 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 NCP1400ASN27T1?
For technical support, including NCP1400ASN27T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1400ASN27T1 requirements.
6.How does Aetrix verify that NCP1400ASN27T1 is sourced from the original manufacturer or authorized distributors?
All NCP1400ASN27T1 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 NCP1400ASN27T1 meets industry standards.
7.What is the process for return or replacement of NCP1400ASN27T1?
All NCP1400ASN27T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1400ASN27T1, 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 NCP1400ASN27T1 part is unused and in its original packaging.
Return procedure for NCP1400ASN27T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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