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onsemi NCP1400ASN27T1G
- Part No.:
- NCP1400ASN27T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1400ASN27T1G.pdf
- Description:
- IC REG BOOST 2.7V 100MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
NCP1400ASN27T1G from onsemi is a fixed-frequency PWM step-up micropower DC-DC switching regulator designed for low-voltage battery-powered portable equipment. It starts up at 0.8 V, operates down to 0.2 V, delivers up to 100 mA output current, and provides a regulated 2.7 V output with ±2.5% accuracy. It integrates oscillator, PWM controller, error amplifier, soft-start, chip enable, and power MOSFET in TSOP-5 package.
For engineers reviewing the NCP1400ASN27T1G datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low startup voltage, discontinuous-mode stability, CE-controlled shutdown, 180 kHz fixed switching frequency, and minimal external component count (only four required).
Technical Context
The NCP1400ASN27T1G implements a voltage-mode PWM boost architecture operating exclusively in discontinuous conduction mode (DCM), with internal phase-compensated error amplification ensuring stability across full load and input ranges. Its 180 kHz oscillator exhibits ±20% tolerance and 0.11%/°C temperature coefficient.
Startup and hold functionality is validated down to 0.8 V and 0.3 V respectively; output regulation uses an internal trimmed resistor network set to 2.7 V ±2.5%, and cycle-by-cycle current limiting protects the integrated MOSFET with a typical 350 mA threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.7 V ±2.5% - factory-trimmed internal feedback ensures stable rail without external resistors |
| Switching Frequency | 180 kHz ±20% - fixed-frequency PWM enables predictable EMI filtering and inductor sizing |
| Startup Voltage | 0.8 V max - enables operation from nearly-dead single-cell alkaline or NiMH batteries |
| Max Output Current | 100 mA - sufficient for white LED backlighting or low-power logic rails in portable devices |
| Quiescent Current | 32 µA typ. at 2.7 V - minimizes battery drain during active regulation |
| Shutdown Current | 0.6–1.5 µA - achieved via CE pin <0.3 V, extending shelf life in standby |
| Operating Temp | −40°C to +85°C - qualified for consumer and industrial portable applications |
Pinout & Package
Package: TSOP-5 (Case 483), Pb-free, 3.0 mm × 1.5 mm footprint, 1.0 mm max height, 0.95 mm pitch.
| 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 |
| 2 - OUT | Regulated output & IC power supply | Provides 2.7 V output and powers internal circuitry; must be decoupled with ≥10 µF capacitor |
| 3 - NC | No internal connection | Not bonded; must remain unconnected and unpopulated on PCB |
| 4 - GND | Power and signal reference ground | Single-point ground connection critical for noise reduction and stability in boost topology |
| 5 - LX | Switch node for external inductor | Connects to inductor's switch-side terminal; carries pulsed current up to 350 mA peak |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with single-cell batteries near end-of-life, extending usable runtime |
| Integrated soft-start | 2 ms typical ramp prevents inrush current and stabilizes output before load engagement |
| Discontinuous mode optimization | Internal compensation guarantees stability without external components across full load range |
| CE-controlled shutdown | Reduces total system current to sub-µA level, enabling long-term storage without battery depletion |
| Minimal BOM requirement | Only four external parts (inductor, diode, input/output caps) needed for complete functional converter |
Applications
| White LED Backlighting | Low-Power Microcontroller Supply |
|---|---|
Use Scenario: Powering 1–3串联 white LEDs in handheld medical testers or barcode scanners using a single 1.5 V alkaline cell. IC Role / Device Role / Timing Role: Step-up regulator generating stable 2.7 V rail to drive constant-current LED driver ICs. Use Value: Enables LED illumination at battery voltages as low as 0.8 V, doubling effective battery life versus linear solutions. | Use Scenario: Supplying 2.7 V to ultra-low-power ARM Cortex-M0+ MCUs in wireless sensor nodes powered by coin cells. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated core voltage while supporting deep-sleep modes. Use Value: 32 µA quiescent current and CE-gated shutdown reduce average system current to <1 µA in sleep states. |
| Digital Camera Flash Support | Portable Audio Codec Bias Rail |
Use Scenario: Providing fast-ramping 2.7 V bias for flash LED drivers in compact digital cameras with AA/AAA battery packs. IC Role / Device Role / Timing Role: High-efficiency boost stage preceding charge-pump flash driver ICs. Use Value: 100 mA output capability supports short-duration high-current flash pulses without brownout. | Use Scenario: Generating clean 2.7 V analog bias for audio codecs in Bluetooth headsets powered by Li-ion or NiMH cells. IC Role / Device Role / Timing Role: Low-noise regulated supply isolating sensitive analog circuitry from noisy digital domains. Use Value: Fixed 180 kHz switching allows deterministic EMI filtering; internal compensation avoids instability with ceramic output caps. |
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 2.2 MHz switching frequency; 1.8–5.5 V adjustable output; requires external feedback resistors | Better suited for space-constrained designs needing smaller inductors; less ideal for ultra-low-IQ battery longevity | Select when board area is critical and higher IQ is acceptable; not drop-in due to different pinout and external resistor dependency |
| MAX17222ETA+ | Lower 0.4 V startup; 1.8–5.25 V adjustable output; 300 mA output; requires external feedback | Superior for deeply discharged cells; higher current supports more demanding loads but increases complexity | Choose when minimum startup voltage is paramount and design can accommodate two external resistors and layout changes |
Compared with TPS61022DRVR and MAX17222ETA+, the NCP1400ASN27T1G offers factory-set 2.7 V output with zero external resistors, lowest BOM count, and best trade-off between ultra-low startup voltage (0.8 V) and micropower operation (32 µA IQ), making it optimal for cost-sensitive, long-life portable devices.
Availability
NCP1400ASN27T1G is available at Aetrix Electronics and suitable for cellular telephones, digital cameras, handheld instruments, and white LED torch lights requiring stable component supply and long-term manufacturability.
Supply support for NCP1400ASN27T1G 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP1400ASN27T1G belongs to the NCP1400A series of micropower step-up regulators, engineered specifically for ultra-low-voltage battery-powered portable electronics where minimal component count and extended battery life are primary design goals.
FAQ
What is the minimum input voltage required for NCP1400ASN27T1G to start regulating?
The NCP1400ASN27T1G has a guaranteed maximum startup voltage of 0.95 V and a typical value of 0.8 V at 25°C. It can initiate regulation from a single nearly-depleted alkaline or NiMH cell, enabling operation well beyond conventional boost IC limits. This specification is validated across temperature and load conditions per the official onsemi datasheet.
Does NCP1400ASN27T1G require external feedback resistors to set its 2.7 V output?
No. The NCP1400ASN27T1G features an internally trimmed resistor network that fixes the output to 2.7 V ±2.5%. No external feedback resistors are needed - only four passive components (inductor, Schottky diode, input capacitor, output capacitor) are required to implement a complete, stable boost converter. This simplifies layout and reduces BOM cost.
How does the CE pin function on NCP1400ASN27T1G, and what happens if left unconnected?
The CE pin on NCP1400ASN27T1G controls device enable/disable state. Applying ≥0.9 V enables regulation; ≤0.3 V disables it. If left floating, an internal 150 nA pull-up current source ties CE to the OUT pin, resulting in automatic enablement. Avoid applying 0.3–0.9 V, as this places the IC in an undefined state and may cause excessive current draw.
What is the recommended inductor value for NCP1400ASN27T1G, and why?
onsemi recommends 18–27 µH inductors for NCP1400ASN27T1G, with 22 µH being the standard value used in evaluation circuits. This range balances peak current capability, efficiency, and physical size. A 22 µH inductor supports up to 100 mA output while maintaining DCM operation and minimizing losses - critical for achieving the specified 32 µA quiescent current and stable regulation.
Can NCP1400ASN27T1G operate in continuous conduction mode (CCM)?
No. The NCP1400ASN27T1G is explicitly designed for discontinuous conduction mode (DCM) operation only. Its internal compensation network is optimized for DCM stability across full input/output and load ranges. Attempting CCM operation - for example, by using too large an inductor or too high a load - risks instability, oscillation, or failure to regulate. DCM is inherent to its micropower, low-IQ architecture.
NCP1400ASN27T1G 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
NCP1400ASN27T1G FAQ
1.How can I place an order for NCP1400ASN27T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1400ASN27T1G 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 NCP1400ASN27T1G reliable?
The price and inventory of NCP1400ASN27T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1400ASN27T1G is usually 5 days.
3.What payment methods are accepted for NCP1400ASN27T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1400ASN27T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1400ASN27T1G?
NCP1400ASN27T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1400ASN27T1G 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 NCP1400ASN27T1G?
For technical support, including NCP1400ASN27T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1400ASN27T1G requirements.
6.How does Aetrix verify that NCP1400ASN27T1G is sourced from the original manufacturer or authorized distributors?
All NCP1400ASN27T1G 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 NCP1400ASN27T1G meets industry standards.
7.What is the process for return or replacement of NCP1400ASN27T1G?
All NCP1400ASN27T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1400ASN27T1G, 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 NCP1400ASN27T1G part is unused and in its original packaging.
Return procedure for NCP1400ASN27T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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