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onsemi NCP1402SN33T1
- Part No.:
- NCP1402SN33T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN33T1.pdf
- Description:
- IC REG BOOST 3.3V 130MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
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Product details
Overview
NCP1402SN33T1 from onsemi is a monolithic micropower PFM step-up DC-DC switching regulator designed for ultra-low-voltage battery-powered portable electronics. It starts up at 0.8 V, operates down to 0.3 V, delivers up to 200 mA output at 3.3 V with 85% efficiency (Vin = 2.0 V), and integrates power MOSFET, soft-start, voltage reference, and chip enable. It powers compact devices like MP3 players and digital cameras where single-cell alkaline or NiMH operation is required.
For engineers reviewing the NCP1402SN33T1 datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage margin, PFM ripple behavior under light load, CE pin logic thresholds, LX current limit (130 mA typ.), and compatibility with 47 µH inductors and low-VF Schottky diodes in space-constrained layouts.
Technical Context
The NCP1402SN33T1 implements pulse frequency modulation (PFM) control with cycle-by-cycle current limiting and an integrated soft-start circuit that ramps output to ~1.5 V before regulation begins. Its internal feedback network fixes VOUT at 3.3 V ±2.5%, eliminating external resistors.
It uses a single N-channel power MOSFET switch with typical on-resistance of 1.5 Ω and VLX voltage limit of 0.65 V. The CE pin features an internal 10 MΩ pullup to OUT, enabling default-on operation when left floating - critical for low-quiescent systems requiring zero external bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2.5% - factory-trimmed internal feedback enables fixed-output design without external resistors. |
| Startup Voltage | 0.8 V typ. - allows reliable start from nearly-dead single-cell batteries (e.g., 0.9 V alkaline). |
| Hold Voltage | 0.3 V min. - sustains regulation through deep discharge, extending usable battery life. |
| LX Peak Current | 130 mA typ. - sets maximum inductor peak current; defines safe operating area with 47 µH inductors. |
| Operating Current | 45 µA typ. at VOUT = 3.3 V × 0.96 - ultra-low quiescent draw preserves battery during standby. |
| Efficiency | 85% at Vin = 2.0 V, VOUT = 3.3 V, IO = 70 mA - high conversion efficiency minimizes thermal rise in sealed enclosures. |
| Ripple Voltage | Typ. 30 mV - low output noise supports analog-sensitive loads like audio codecs without added LDO post-regulation. |
Pinout & Package
Package: Thin SOT-23-5 (Case 483), 1.6 mm × 2.9 mm × 1.1 mm profile, Pb-free/RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable input | Active-high enable: ≥0.9 V enables regulation; <0.3 V disables (IOFF = 0.6 µA typ.); floating = enabled via internal 10 MΩ pullup to OUT. |
| 2 - OUT | Regulated output / power supply pin | Supplies internal circuitry and serves as output node; must be decoupled with ≥68 µF low-ESR capacitor. |
| 3 - NC | No internal connection | Unbonded pad - must remain unconnected; no routing or soldering allowed. |
| 4 - GND | Analog/digital ground reference | Single-point grounding with C1/C2 and LX return path is mandatory to minimize switching noise coupling. |
| 5 - LX | Switch node / power MOSFET drain | Connects to inductor and Schottky cathode; carries high di/dt pulses - requires short, wide trace and ground plane clearance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with single-cell primary/secondary batteries near end-of-life. |
| Integrated soft-start | Ramps VOUT to ~1.5 V before regulation, preventing inrush into large output capacitors. |
| PFM control architecture | Variable-frequency operation maintains high efficiency across 10 µA–200 mA load range without forced PWM. |
| Chip enable with internal pullup | Eliminates need for external bias resistor; simplifies PCB layout and reduces BOM count. |
| Micro miniature package | Thin SOT-23-5 footprint fits <25 mm² board area - ideal for wearables and hearing aids. |
Applications
| Portable Audio Playback | Digital Camera Backlight |
|---|---|
|
Use Scenario: Powering 3.3 V audio DAC and amplifier in MP3 player powered by single AA alkaline cell. IC Role / Device Role / Timing Role: Step-up regulator supplying stable 3.3 V rail from 0.8–1.5 V input; handles dynamic load transients during audio burst playback. Use Value: Enables >10-hour runtime by operating down to 0.3 V input and drawing only 45 µA quiescent current between tracks. |
Use Scenario: Driving white LED backlight in compact digital camera with 1.2 V NiMH battery pack. IC Role / Device Role / Timing Role: Boost converter delivering regulated 3.3 V to LED driver IC; supports rapid on/off cycling during photo capture sequences. Use Value: 30 mV typical ripple prevents visible LED flicker; 85% efficiency minimizes heat near optical sensor module. |
| Handheld Medical Monitor | Low-Power Wireless Sensor Node |
|
Use Scenario: Supplying 3.3 V to microcontroller and OLED display in battery-operated pulse oximeter. IC Role / Device Role / Timing Role: Primary power rail generator with CE-controlled shutdown during sleep mode (0.6 µA off-state current). Use Value: Extends battery life to >6 months by maintaining regulation at 0.3 V input and enabling precise duty-cycled operation. |
Use Scenario: Powering 3.3 V RF transceiver and temperature sensor in coin-cell-powered IoT node. IC Role / Device Role / Timing Role: High-efficiency boost stage enabling sub-10 µA average system current during periodic wake-up bursts. Use Value: 0.8 V startup ensures reliable operation even after 2+ years of shelf storage; thin SOT-23-5 fits within 10 mm × 10 mm PCB constraint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61099YFFR | Higher 300 mA output capability; 0.7 V startup; requires external feedback resistors for 3.3 V setting. | Better suited for higher-current loads (e.g., color displays), but adds two passive components and larger solution size. | Select if >200 mA output or tighter VOUT tolerance (<±1%) is required; avoid if minimal BOM and smallest footprint are priorities. |
| MAX17222ELT+T | 0.4 V startup; 1.2 µA quiescent current; fixed 3.3 V output; same SOT-23-5 package. | Superior for ultra-low-power always-on sensors, but lower LX current limit (120 mA) limits peak load capability. | Select for energy-harvesting or multi-year battery applications where sub-µA shutdown current is critical; verify inductor saturation margin at 120 mA. |
Compared with TPS61099YFFR and MAX17222ELT+T, the NCP1402SN33T1 offers the optimal balance of ultra-low startup voltage (0.8 V), integrated 3.3 V feedback, and proven 200 mA capability in the smallest possible footprint - making it ideal for cost- and space-sensitive portable designs where battery voltage rarely exceeds 1.5 V.
Availability
NCP1402SN33T1 is available at Aetrix Electronics and suitable for portable audio, digital imaging, handheld instrumentation, and wireless sensor node applications requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for NCP1402SN33T1 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, engineered specifically for battery-powered portable electronics demanding ultra-low startup voltage, minimal quiescent current, and minimal external component count.
FAQ
What is the minimum input voltage required for the NCP1402SN33T1 to begin regulation?
The NCP1402SN33T1 has a typical minimum startup voltage of 0.8 V and can sustain regulation down to 0.3 V. This allows it to operate from nearly depleted single-cell alkaline, NiMH, or LiFePO₄ batteries. Startup behavior is verified at IO = 0 mA; actual hold voltage degrades slightly under load, as shown in Figure 36 of the NCP1402 datasheet.
Can the NCP1402SN33T1 be used without connecting the CE pin?
Yes - the NCP1402SN33T1 includes an internal 10 MΩ pullup resistor from CE to OUT, so leaving the CE pin unconnected results in automatic enablement. This simplifies design for always-on applications. However, ensure no stray capacitance or leakage pulls CE into the undefined 0.3–0.9 V hysteresis band, which may cause erratic operation.
What inductor value is recommended for the NCP1402SN33T1?
onsemi specifies 47 µH as the optimal inductor value for the NCP1402SN33T1 across most applications. It balances low ripple, high efficiency, and sufficient peak current handling (130 mA typ.). Inductors below 27 µH are not recommended due to switch limitations; values above 47 µH reduce ripple but constrain maximum output current.
Does the NCP1402SN33T1 require an external Schottky diode?
Yes - the NCP1402SN33T1 requires an external Schottky diode (e.g., MBR0520LT1) connected between LX and VOUT. The internal power switch is a single N-channel MOSFET; the diode provides the return path for inductor current during switch-off periods. Low forward voltage (<0.3 V) and fast recovery are essential for efficiency.
How does the NCP1402SN33T1 achieve its 3.3 V output without external resistors?
The NCP1402SN33T1 uses a factory-trimmed internal resistor divider network to set VOUT at 3.3 V ±2.5%. This eliminates the need for external feedback resistors, reducing BOM count, PCB area, and potential tolerance drift. The trim occurs during wafer test and is laser-adjusted for accuracy across temperature.
NCP1402SN33T1 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:
- 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
NCP1402SN33T1 FAQ
1.How can I place an order for NCP1402SN33T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN33T1 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 NCP1402SN33T1 reliable?
The price and inventory of NCP1402SN33T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN33T1 is usually 5 days.
3.What payment methods are accepted for NCP1402SN33T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN33T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN33T1?
NCP1402SN33T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN33T1 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 NCP1402SN33T1?
For technical support, including NCP1402SN33T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN33T1 requirements.
6.How does Aetrix verify that NCP1402SN33T1 is sourced from the original manufacturer or authorized distributors?
All NCP1402SN33T1 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 NCP1402SN33T1 meets industry standards.
7.What is the process for return or replacement of NCP1402SN33T1?
All NCP1402SN33T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN33T1, 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 NCP1402SN33T1 part is unused and in its original packaging.
Return procedure for NCP1402SN33T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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