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onsemi NCP1402SN33T1G
- Part No.:
- NCP1402SN33T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN33T1G.pdf
- Description:
- IC REG BOOST 3.3V 130MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,707
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Product details
Overview
NCP1402SN33T1G from onsemi is a monolithic micropower PFM step-up DC-DC converter optimized for single- or dual-cell battery-powered portable equipment. 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 low-voltage logic rails in handheld instruments and portable audio.
For engineers reviewing the NCP1402SN33T1G datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low startup voltage, regulated 3.3 V ±2.5% output, 30 µA operating current at 1.9 V, Thin SOT-23-5 package compatibility, and CE-controlled shutdown for battery life extension.
Technical Context
The NCP1402SN33T1G implements pulse frequency modulation (PFM) control with an internal oscillator, PFM comparator, and cycle-by-cycle current limiting. Its architecture enables variable-frequency operation in continuous conduction mode, minimizing quiescent current while maintaining regulation across wide input voltage ranges (0.3–2.0 V).
Startup and hold behavior is defined by dedicated thresholds: minimum startup voltage is 0.8 V (typ), holding voltage is ≤0.3 V (min), and the VLX limiter enforces a 0.65 V (typ) switch voltage limit to protect the integrated N-channel FET. The CE pin uses an internal 10 MΩ pullup and requires ≥0.9 V to enable or <0.3 V to disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2.5% - factory-trimmed internal feedback network eliminates external resistors for fixed 3.3 V rail generation. |
| Startup Voltage | 0.8 V (typ) - enables operation from nearly-dead alkaline or NiMH cells, critical for long-life battery applications. |
| Operating Current | 45 µA (typ) at VOUT = 3.3 V × 0.96 - ultra-low quiescent current preserves battery capacity during light-load standby. |
| Efficiency | 85% at Vin = 2.0 V, VOUT = 3.3 V, IO = 70 mA - high conversion efficiency extends runtime in space-constrained portable devices. |
| Max Output Current | 200 mA (at Vin = 2.0 V) - sufficient to drive multiple low-power ICs (e.g., microcontrollers, sensors, RF modules) from a single cell. |
| Switch On-Time | 5.5 µs (typ) - short on-time supports high-frequency switching with small inductors (e.g., 47 µH) and low output ripple. |
| Package | Thin SOT-23-5 (Case 483) - 2.9 mm × 1.6 mm × 1.1 mm footprint enables compact PCB layouts in wearables and handhelds. |
Pinout & Package
Package: Thin SOT-23-5 (Case 483), Pb-free, RoHS-compliant, 5-terminal surface-mount package with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable input | Logic-level control: ≥0.9 V enables regulation; <0.3 V disables (0.6 µA off-state current); floating defaults to enabled via internal 10 MΩ pullup to OUT. |
| 2 - OUT | Regulated output & supply pin | Provides 3.3 V output and powers internal circuitry; must be decoupled with ≥10 µF low-ESR capacitor near the pin. |
| 3 - NC | No internal connection | Unbonded pin - must remain unconnected; no routing or soldering required. |
| 4 - GND | Power ground reference | Primary return path for inductor current and IC bias; requires low-impedance one-point grounding with C1/C2 grounds per layout guidelines. |
| 5 - LX | Switch node / inductor connection | Drain of internal N-channel MOSFET; connects to inductor and Schottky diode anode; handles peak currents up to 200 mA with 0.65 V (typ) voltage limit. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables operation from partially discharged batteries - extends usable battery life beyond conventional boost converters. |
| Integrated power switch | On-chip 200 mA N-channel MOSFET eliminates external transistor, reducing BOM count and PCB area in space-sensitive designs. |
| Soft-start circuit | Ramps output to ~1.5 V before full regulation - prevents inrush current and stabilizes startup under heavy capacitive loads. |
| PFM control architecture | Variable-frequency operation minimizes light-load quiescent current (45 µA typ) without requiring external compensation networks. |
| CE-controlled shutdown | Reduces off-state current to 0.6 µA (max), enabling system-level power gating for multi-rail battery management. |
Applications
| Handheld Medical Sensors | Portable Audio Decoders |
|---|---|
Use Scenario: Powering low-noise analog front-ends and BLE transceivers in battery-operated pulse oximeters and glucose meters. IC Role / Device Role / Timing Role: Generates stable 3.3 V rail from a single AA/AAA cell while maintaining <30 mV output ripple for ADC reference integrity. Use Value: Enables >12-month battery life due to 0.3 V hold voltage and 45 µA operating current - critical for maintenance-free clinical deployment. |
Use Scenario: Supplying 3.3 V to MP3 decoder ICs and Class D amplifiers in compact Bluetooth speakers and voice recorders. IC Role / Device Role / Timing Role: Acts as primary boost regulator delivering 150 mA peak current with PFM noise shaping to avoid audible switching artifacts. Use Value: Achieves 85% efficiency at 70 mA load, reducing thermal rise in sealed enclosures and preserving battery runtime during playback. |
| Industrial Hand Scanners | Smart Remote Controls |
Use Scenario: Providing regulated 3.3 V to CMOS image sensors and laser drivers in rugged barcode scanners used in warehouses. IC Role / Device Role / Timing Role: Powers imaging subsystem during brief high-current bursts (200 mA pulses) while sustaining regulation down to 0.3 V input. Use Value: Eliminates need for voltage supervisor ICs - direct start-up from depleted lithium coin cells reduces component count and cost. |
Use Scenario: Supplying 3.3 V to ultra-low-power MCUs and IR emitters in energy-harvesting or long-life remote controls. IC Role / Device Role / Timing Role: Delivers regulated output during intermittent transmit bursts while consuming only 0.6 µA in CE-disabled sleep mode. Use Value: Supports >5-year battery life using CR2032 cells - enabled by sub-1 V startup and nanoscale off-state leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Higher 0.3-V startup (vs. 0.8 V), 600-mA output, but 75-µA quiescent current - less suitable for ultra-low-power, single-cell use cases. | Targets higher-current applications like LCD bias supplies; lacks sub-0.5-V hold capability needed for deep-discharge battery operation. | Select when >300 mA output or tighter line regulation is required; avoid if battery voltage drops below 0.8 V during discharge. |
| MAX17222ETA+ | 0.4-V startup, 300-mA output, 1.5-µA shutdown current, but requires external feedback resistors for 3.3 V setting. | Better for designs needing programmable output or multi-voltage rails; adds two passive components and layout complexity. | Choose for flexible output configuration or lower shutdown current; prefer NCP1402SN33T1G for fixed 3.3 V with minimal BOM and smallest footprint. |
Compared with TPS61200DRCT and MAX17222ETA+, the NCP1402SN33T1G uniquely balances ultra-low startup voltage (0.8 V), integrated 3.3 V regulation, and 45 µA operating current in a 2.9 mm² package - making it optimal for space- and battery-limited single-cell systems where simplicity and deep-discharge support are critical.
Availability
NCP1402SN33T1G is available at Aetrix Electronics and suitable for handheld medical sensors, portable audio decoders, industrial hand scanners, and smart remote controls requiring stable component supply with guaranteed long-term manufacturability.
Supply support for NCP1402SN33T1G 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 NCP1402SN33T1G belongs to onsemi's micropower DC-DC converter product line, designed specifically for extending battery life in ultra-low-power portable electronics through minimal quiescent current and deep-input-voltage operation.
FAQ
What is the minimum input voltage required for the NCP1402SN33T1G to start switching?
The NCP1402SN33T1G has a typical minimum startup voltage of 0.8 V, with a maximum of 0.95 V across temperature. This allows reliable initiation from nearly exhausted alkaline, NiMH, or lithium primary cells. Startup is guaranteed down to 0.8 V at 25°C, and the device continues regulating down to 0.3 V input - a key differentiator for long-life battery applications.
How does the CE pin function on the NCP1402SN33T1G, and what happens if it's left unconnected?
The CE pin on the NCP1402SN33T1G features an internal 10 MΩ pullup resistor to the OUT pin. When left floating, the NCP1402SN33T1G remains enabled by default. Applying ≥0.9 V enables normal operation; applying <0.3 V disables the regulator, reducing quiescent current to 0.6 µA (max). Voltages between 0.3 V and 0.9 V must be avoided due to undefined hysteresis behavior.
Can the NCP1402SN33T1G deliver 200 mA continuously at 3.3 V output?
Yes - the NCP1402SN33T1G is rated for up to 200 mA output current at 3.3 V when input voltage is ≥2.0 V. At lower inputs (e.g., 1.2 V), maximum sustainable output current decreases due to duty-cycle limitations; Figure 58 in the datasheet shows ~120 mA at 1.2 V input. Thermal derating applies above +85°C ambient.
What external components are required to implement a functional NCP1402SN33T1G circuit?
Only three external components are required: a 47 µH inductor (e.g., Sumida CD54-470L), a Schottky diode (e.g., onsemi MBR0520LT1), and two capacitors - a 10 µF input capacitor (C1) and a 68 µF low-ESR output capacitor (C2). No feedback resistors are needed since the 3.3 V output is internally trimmed and fixed.
Is the NCP1402SN33T1G RoHS-compliant and lead-free?
Yes - the NCP1402SN33T1G is explicitly stated as Pb-free and RoHS-compliant in the official onsemi datasheet (Publication Order Number NCP1402/D, Rev. 10). It meets EU Directive 2011/65/EU and carries the "Pb-Free Package" marking per the SOT-23-5 pin 1 indicator diagram.
NCP1402SN33T1G 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
NCP1402SN33T1G FAQ
1.How can I place an order for NCP1402SN33T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN33T1G 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 NCP1402SN33T1G reliable?
The price and inventory of NCP1402SN33T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN33T1G is usually 5 days.
3.What payment methods are accepted for NCP1402SN33T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN33T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN33T1G?
NCP1402SN33T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN33T1G 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 NCP1402SN33T1G?
For technical support, including NCP1402SN33T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN33T1G requirements.
6.How does Aetrix verify that NCP1402SN33T1G is sourced from the original manufacturer or authorized distributors?
All NCP1402SN33T1G 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 NCP1402SN33T1G meets industry standards.
7.What is the process for return or replacement of NCP1402SN33T1G?
All NCP1402SN33T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN33T1G, 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 NCP1402SN33T1G part is unused and in its original packaging.
Return procedure for NCP1402SN33T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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