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onsemi NCP1402SN40T1G
- Part No.:
- NCP1402SN40T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN40T1G.pdf
- Description:
- IC REG BOOST 4V 130MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
NCP1402SN40T1G from onsemi is a monolithic micropower PFM step-up DC-DC switching regulator optimized for ultra-low-voltage battery-powered applications. It starts up at 0.8 V, operates down to 0.3 V, delivers up to 200 mA output current at 4.0 V (Vin = 2.0 V), and features integrated power MOSFET, soft-start, and chip enable control - used in portable audio, digital cameras, and handheld instruments.
For engineers reviewing the NCP1402SN40T1G datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage margin, PFM efficiency at light loads, CE pin logic thresholds, output voltage accuracy (±2.5%), and SOT-23-5 thermal performance under continuous conduction mode.
Technical Context
The NCP1402SN40T1G implements pulse frequency modulation (PFM) with variable switching frequency, enabling high efficiency across wide load ranges - especially critical below 10 mA where quiescent current is only 55 µA. Its internal feedback network sets a fixed 4.0 V output without external resistors.
Startup and hold behavior is defined by dedicated comparator circuitry: minimum startup voltage is 0.8 V (typ), dropping to 0.3 V (min) for sustained operation. The LX pin integrates an N-channel MOSFET switch with cycle-by-cycle current limiting (typ. 350 mA peak) and 0.65 V voltage limit threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.0 V ±2.5% - factory-trimmed internal feedback enables stable regulation without external resistor network. |
| Startup Voltage | 0.8 V (typ) - allows operation from single NiMH or deeply discharged Li-ion cells. |
| Hold Voltage | 0.3 V (min) - maintains regulation until battery reaches near-exhaustion, maximizing usable energy. |
| Quiescent Current | 55 µA (typ) at VOUT = 4.0 V × 0.96 - ensures minimal drain during standby in always-on portable devices. |
| Switch Current Limit | 350 mA (typ) - protects internal MOSFET and prevents inductor saturation under transient overload. |
| Efficiency | 85% (at Vin = 2.0 V, VOUT = 4.0 V, IO = 70 mA) - high conversion efficiency extends battery runtime in compact form factor. |
| Output Ripple | Typ. 30 mV - low noise output supports sensitive analog and RF circuitry without additional filtering. |
Pinout & Package
Package: Thin SOT-23-5 (Case 483), Pb-free, RoHS compliant, 1.6 mm × 2.9 mm footprint with 0.95 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable input | Active-high enable: ≥0.9 V enables regulation; <0.3 V disables IC (IOFF ≤ 1.0 µA); floating defaults to enabled via internal 10 MΩ pullup. |
| 2 - OUT | Regulated output & supply pin | Delivers 4.0 V output; also powers internal circuitry - must be decoupled with ≥10 µF low-ESR capacitor. |
| 3 - NC | No internal connection | Unbonded pad - electrically isolated; no routing or soldering required. |
| 4 - GND | Ground reference | Common return for input, output, and internal circuits - requires low-impedance single-point grounding per layout guidelines. |
| 5 - LX | Switch node | Drain of internal N-MOSFET - connects to inductor and Schottky diode anode; handles pulsed currents up to 350 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with single-cell alkaline/NiMH batteries before conventional regulators activate. |
| Integrated power switch | On-chip N-channel MOSFET eliminates external transistor, reducing BOM count and PCB area in space-constrained designs. |
| PFM control architecture | Variable-frequency operation maintains >80% efficiency from 0.1 mA to 200 mA, avoiding efficiency cliffs at light loads. |
| Soft-start function | Internal ramp limits inrush current during startup, preventing input voltage droop and protecting upstream battery/capacitor. |
| Chip enable with hysteresis | CE pin logic avoids metastability: 0.3–0.9 V range is undefined - design requires clean high/low transitions for reliable shutdown. |
Applications
| Portable Audio Players | Digital Cameras |
|---|---|
Use Scenario: Powering 3.3 V or 4.0 V audio DACs and amplifiers from single 1.5 V alkaline or 1.2 V NiMH cells. IC Role / Device Role / Timing Role: Step-up regulator providing stable 4.0 V rail with low ripple (<30 mV) to minimize audible noise in headphone outputs. Use Value: Enables full battery utilization down to 0.3 V, extending playback time by ~18% versus higher-startup alternatives. |
Use Scenario: Supplying image sensor bias and flash LED drivers in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 4.0 V at up to 200 mA during burst capture sequences. Use Value: Maintains regulation during rapid load transients (0.1 → 80 mA in <10 µs), preventing sensor reset or frame loss. |
| Handheld Test Instruments | Wireless Remote Controls |
Use Scenario: Generating 4.0 V for precision ADC references and op-amp rails in battery-operated multimeters. IC Role / Device Role / Timing Role: Low-noise, low-quiescent regulator ensuring stable reference voltage despite varying battery state. Use Value: 55 µA operating current minimizes self-discharge during months-long storage between field measurements. |
Use Scenario: Boosting voltage for 2.4 GHz RF transmitter ICs in sub-GHz or BLE remotes powered by coin cells. IC Role / Device Role / Timing Role: Micropower step-up converter enabling 4.0 V transmit bursts from 1.2–1.5 V primary cells. Use Value: 0.8 V startup allows operation even after extended shelf life, improving first-use reliability in consumer packaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992DRVR | Fixed 4.0 V output, 300 mA ISW, 0.7 V startup, 25 µA IQ - uses different PFM architecture with lower quiescent current but tighter input voltage range. | Better suited for ultra-low-power IoT sensors requiring sub-10 µA shutdown; less tolerant of deep discharge below 0.5 V. | Select TPS610992DRVR when minimizing standby current is critical and input voltage stays above 0.7 V. |
| SP6650ES-L/TR | Adjustable output (1.8–5.5 V), 200 mA, 0.9 V startup, 65 µA IQ - requires external feedback resistors and lacks integrated soft-start. | Offers flexibility for multi-rail systems but increases component count and layout complexity vs. fixed-output NCP1402SN40T1G. | Select SP6650ES-L/TR only when programmable output voltage is required and board space permits two extra resistors. |
Compared with TPS610992DRVR and SP6650ES-L/TR, the NCP1402SN40T1G provides superior deep-discharge support (0.3 V hold), simpler implementation (no feedback resistors), and proven robustness in high-volume portable audio and imaging applications - making it optimal for cost-sensitive, space-constrained designs prioritizing battery longevity over ultra-low IQ.
Availability
NCP1402SN40T1G is available at Aetrix Electronics and suitable for portable audio players, digital cameras, and handheld test instruments requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for NCP1402SN40T1G 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 intelligent edge applications.
The NCP1402 series belongs to onsemi's micropower DC-DC converter product line, designed specifically for battery-powered portable electronics where ultra-low startup voltage, minimal quiescent current, and small footprint are essential.
FAQ
What is the minimum input voltage required for the NCP1402SN40T1G to start switching?
The NCP1402SN40T1G has a typical minimum startup voltage of 0.8 V, with a maximum of 0.95 V across temperature. This allows reliable startup from nearly depleted single-cell batteries. Once running, it sustains regulation down to 0.3 V (minimum hold voltage), enabling full extraction of stored energy in alkaline, NiMH, or lithium primary cells.
How does the CE pin of the NCP1402SN40T1G behave when left unconnected?
When the CE pin of the NCP1402SN40T1G is left floating, an internal 10 MΩ pullup resistor connects it to the OUT pin, resulting in automatic enablement. The device enters normal regulation mode - no external pullup is required. However, avoid applying voltages between 0.3 V and 0.9 V to prevent undefined logic states.
Can the NCP1402SN40T1G drive a 200 mA load at 4.0 V output continuously?
Yes - the NCP1402SN40T1G is rated for up to 200 mA output current at VIN = 2.0 V and VOUT = 4.0 V, provided thermal conditions remain within limits. At 200 mA, junction temperature rise depends on PCB copper area and ambient conditions; the SOT-23-5 package has RJA = 250°C/W, so adequate copper pour is recommended for sustained loads.
What external components are mandatory for basic operation of the NCP1402SN40T1G?
Three external components are mandatory: a 47 µH power inductor (e.g., Sumida CD54-470L), a Schottky diode (e.g., MBR0520LT1), and an output capacitor (≥47 µF low-ESR tantalum or ceramic). An input capacitor (≥10 µF) is strongly recommended for stability but not strictly mandatory in low-noise, low-current applications.
Is the NCP1402SN40T1G RoHS compliant and lead-free?
Yes - the NCP1402SN40T1G is Pb-free and fully RoHS compliant, as confirmed in the official onsemi datasheet (Publication Order Number: NCP1402/D, Rev. 10). The "G" suffix explicitly denotes green (lead-free) packaging, and the device meets JEDEC J-STD-020A moisture sensitivity level MSL 1.
NCP1402SN40T1G 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):
- 4V
- Voltage - Output (Min/Fixed):
- 4V
- Voltage - Output (Max):
- -
- Current - Output:
- 130mA (Switch)
- Frequency - Switching:
- Up to 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP1402SN40T1G FAQ
1.How can I place an order for NCP1402SN40T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN40T1G 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 NCP1402SN40T1G reliable?
The price and inventory of NCP1402SN40T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN40T1G is usually 5 days.
3.What payment methods are accepted for NCP1402SN40T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN40T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN40T1G?
NCP1402SN40T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN40T1G 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 NCP1402SN40T1G?
For technical support, including NCP1402SN40T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN40T1G requirements.
6.How does Aetrix verify that NCP1402SN40T1G is sourced from the original manufacturer or authorized distributors?
All NCP1402SN40T1G 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 NCP1402SN40T1G meets industry standards.
7.What is the process for return or replacement of NCP1402SN40T1G?
All NCP1402SN40T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN40T1G, 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 NCP1402SN40T1G part is unused and in its original packaging.
Return procedure for NCP1402SN40T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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