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onsemi NCP1400ASN33T1
- Part No.:
- NCP1400ASN33T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1400ASN33T1.pdf
- Description:
- IC REG BOOST 3.3V 100MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,104
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Product details
Overview
NCP1400ASN33T1 from onsemi is a micropower fixed-frequency PWM step-up DC-DC switching regulator designed for low-voltage battery-powered portable electronics. It starts up at 0.8 V, operates down to 0.2 V, delivers up to 100 mA output current at 3.3 V, and integrates oscillator, PWM controller, error amplifier, soft-start, and power MOSFET in TSOP-5 package - enabling compact boost conversion for white LED torch lights and handheld instruments.
For engineers reviewing the NCP1400ASN33T1 datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage (0.8 V), output regulation accuracy (±2.5%), fixed 180 kHz switching frequency, CE-controlled shutdown (1.5 µA off-state current), and TSOP-5 thermal performance (RJA = 250 °C/W).
Technical Context
The NCP1400ASN33T1 implements a voltage-mode PWM control architecture with internal phase-compensated error amplifier optimized for stable discontinuous conduction mode (DCM) operation. Its 180 kHz oscillator features ±20% tolerance and 0.11%/°C temperature coefficient, while cycle-by-cycle current limiting protects the integrated MOSFET at ~350 mA peak inductor current.
Regulation relies on an internal trimmed feedback resistor network set to 3.3 V ±2.5%, with soft-start ramping output to ~1.5 V before closed-loop control engages. The CE pin enables/disable functionality via 0.9 V high-threshold and 0.3 V low-threshold logic, supported by an internal 150 nA pull-up to OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2.5% - factory-trimmed internal feedback ensures stable rail for microcontroller I/O or LED bias without external resistors. |
| Switching Frequency | 180 kHz ±20% - fixed-frequency PWM enables predictable EMI filtering and simplifies inductor selection (18–27 µH recommended). |
| Startup Voltage | 0.8 V typical - allows operation from single NiMH or alkaline cell near end-of-life, extending usable battery capacity. |
| Max Output Current | 100 mA - sufficient to drive 3–5 white LEDs in series or power low-power sensors and RF transceivers. |
| Quiescent Current | 37 µA typical (IDD1) - minimizes standby drain in always-on portable devices; drops to 1.5 µA in shutdown mode. |
| Operating Temp Range | −40°C to +85°C ambient - validated for industrial handhelds and consumer electronics deployed across global climates. |
| Package | TSOP-5 (Case 483) - 3.0 × 1.5 mm footprint with exposed pad option supports compact PCB layouts and moderate power dissipation. |
Pinout & Package
TSOP-5 package (Case 483), 5-pin surface-mount, 3.0 mm × 1.5 mm body, 0.95 mm pitch, lead-free/RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable input | Logic-controlled shutdown: ≥0.9 V enables regulation; ≤0.3 V disables IC (1.5 µA IOFF); floating defaults to enabled via internal 150 nA pull-up to OUT. |
| 2 - OUT | Output voltage monitor & supply | Provides regulated 3.3 V output and powers internal circuitry; also serves as reference for CE pull-up and feedback network. |
| 3 - NC | No connect | Internally unconnected; must remain unpopulated or left floating - no routing or grounding permitted. |
| 4 - GND | Power and signal ground | Common return for input, output, and internal circuits; requires low-impedance one-point grounding per layout guidelines to minimize noise. |
| 5 - LX | Switch node | Connects to inductor and Schottky diode anode; carries pulsed current up to 350 mA peak; requires short, wide trace to reduce parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with single-cell batteries depleted below 1.0 V, maximizing usable energy in space-constrained devices. |
| Integrated power switch | On-chip MOSFET eliminates external transistor, reducing BOM count and PCB area while ensuring matched gate drive timing. |
| Discontinuous mode stability | Phase-compensated error amplifier guarantees loop stability across full load (0–100 mA) and input range (0.2–3.3 V) without external compensation. |
| Soft-start protection | Gradual output ramp to ~1.5 V prevents inrush current into output capacitor and avoids transient stress on downstream loads. |
| Pb-free & RoHS-compliant | Meets environmental compliance requirements for global consumer electronics and medical-grade portable equipment. |
Applications
| White LED Torch Light | Handheld Instrument |
|---|---|
Use Scenario: Battery-powered flashlight using 1–2 alkaline/NiMH cells to drive 3–5串联 white LEDs requiring stable 3.3 V bias. IC Role / Device Role / Timing Role: Step-up regulator providing regulated 3.3 V output from 0.8–1.5 V input; replaces discrete boost solutions with integrated control and switch. Use Value: Enables >30% longer runtime vs. linear regulators by maintaining efficiency (>80%) even at 0.9 V input, while eliminating external feedback resistors. | Use Scenario: Portable multimeter or data logger powered by coin cell or AAA battery, needing clean 3.3 V for MCU, ADC, and display backlight. IC Role / Device Role / Timing Role: Primary power management IC delivering low-noise, regulated 3.3 V rail with CE-controlled sleep mode during measurement idle periods. Use Value: Achieves 1.5 µA shutdown current to extend shelf life beyond 5 years; soft-start prevents display flicker during wake-up. |
| Personal Digital Assistant | Digital Camera |
Use Scenario: Legacy PDA with monochrome LCD and IR transceiver, operating from single AA battery with dynamic load steps. IC Role / Device Role / Timing Role: System voltage booster supplying 3.3 V to processor I/O and peripheral interfaces during burst communication events. Use Value: Handles 30 mA load transients with <50 mV overshoot (Fig. 36), and maintains regulation down to 0.2 V input - supporting full battery discharge. | Use Scenario: Compact digital camera using 1.5 V alkaline battery to power CMOS image sensor and flash memory interface. IC Role / Device Role / Timing Role: Dedicated 3.3 V supply for sensor analog front-end and SD card controller, isolated from noisy digital domains. Use Value: Fixed 180 kHz switching enables simple LC filter design; low 37 µA quiescent current preserves battery during preview mode. |
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-MHz switching frequency, 1.8-A switch current, but requires external feedback resistors for 3.3 V output. | Better suited for high-efficiency, high-current loads (e.g., OLED displays); less optimal for ultra-low-input-voltage (<0.9 V) legacy battery systems. | Select when higher output current (>100 mA) and smaller inductor size are prioritized over minimal BOM count and sub-1-V startup. |
| MAX756CSA+ | Fixed 5-V output only; 1.5-V minimum startup; no CE pin; requires external compensation capacitor. | Limited to 5-V applications; lacks enable control and precise 3.3-V regulation - unsuitable where voltage matching or power sequencing is required. | Consider only if system already uses 5-V peripherals and board space allows external compensation components. |
Compared with TPS61022DRVR and MAX756CSA+, the NCP1400ASN33T1 uniquely combines factory-set 3.3 V output, 0.8-V startup, integrated switch, and CE shutdown in a 5-pin TSOP - making it optimal for cost-sensitive, space-constrained, single-cell portable designs requiring minimal external components.
Availability
NCP1400ASN33T1 is available at Aetrix Electronics and suitable for white LED torch lights, handheld instruments, and personal digital assistants requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.
Supply support for NCP1400ASN33T1 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 innovation for automotive, industrial, cloud, and IoT applications.
The NCP1400A series was designed specifically for ultra-low-voltage portable electronics - delivering micropower boost conversion with minimal external components for battery longevity and compact form factors.
FAQ
What is the minimum input voltage required for NCP1400ASN33T1 to start regulating?
The NCP1400ASN33T1 has a typical minimum startup voltage of 0.8 V, with a maximum of 0.95 V across temperature. This allows reliable operation from deeply discharged single-cell alkaline or NiMH batteries. Below this threshold, the device remains inactive until input rises above the startup level. The NCP1400ASN33T1 sustains regulation down to 0.2 V input under no-load conditions.
Does NCP1400ASN33T1 require external feedback resistors to set its 3.3 V output?
No, the NCP1400ASN33T1 does not require external feedback resistors. Its 3.3 V output is factory-trimmed using an internal resistor network with ±2.5% accuracy. This eliminates two external components, reduces PCB area, and improves reliability versus adjustable boost converters - a key advantage of the NCP1400ASN33T1 in space-constrained portable designs.
How does the CE pin function on NCP1400ASN33T1, and what happens if left unconnected?
The CE pin on NCP1400ASN33T1 controls enable/disable state: ≥0.9 V enables regulation, ≤0.3 V disables it (reducing current to 1.5 µA). If left floating, the internal 150 nA pull-up current source ties CE to the OUT pin, resulting in automatic enable - a design feature that simplifies default operation. Applying 0.3–0.9 V risks undefined behavior and excessive current draw.
What is the maximum continuous output current capability of NCP1400ASN33T1?
The NCP1400ASN33T1 supports up to 100 mA of continuous output current at 3.3 V under typical conditions (TA = 25°C, proper layout, and recommended 22 µH inductor). Peak inductor current reaches ~350 mA due to DCM operation. Sustained 100 mA output requires adequate thermal management - the TSOP-5 package has RJA = 250 °C/W, limiting practical continuous load in still-air environments.
Can NCP1400ASN33T1 be used in continuous conduction mode (CCM)?
No, the NCP1400ASN33T1 is explicitly designed for discontinuous conduction mode (DCM) operation. Its internal compensation network ensures stability only in DCM across full input/output and load ranges. Attempting CCM operation - for example, by using too large an inductor or excessive load - may cause instability, oscillation, or failure to regulate. The datasheet confirms stability cannot be guaranteed in CCM.
NCP1400ASN33T1 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):
- 3.3V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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
NCP1400ASN33T1 FAQ
1.How can I place an order for NCP1400ASN33T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1400ASN33T1 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 NCP1400ASN33T1 reliable?
The price and inventory of NCP1400ASN33T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1400ASN33T1 is usually 5 days.
3.What payment methods are accepted for NCP1400ASN33T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1400ASN33T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1400ASN33T1?
NCP1400ASN33T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1400ASN33T1 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 NCP1400ASN33T1?
For technical support, including NCP1400ASN33T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1400ASN33T1 requirements.
6.How does Aetrix verify that NCP1400ASN33T1 is sourced from the original manufacturer or authorized distributors?
All NCP1400ASN33T1 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 NCP1400ASN33T1 meets industry standards.
7.What is the process for return or replacement of NCP1400ASN33T1?
All NCP1400ASN33T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1400ASN33T1, 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 NCP1400ASN33T1 part is unused and in its original packaging.
Return procedure for NCP1400ASN33T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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