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onsemi NCP1402SN50T1
- Part No.:
- NCP1402SN50T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN50T1.pdf
- Description:
- IC REG BOOST 5V 130MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
NCP1402SN50T1 from onsemi is a monolithic micropower PFM step-up DC-DC switching regulator designed for ultra-low-voltage battery-powered portable equipment. It starts up at 0.8 V, operates down to 0.3 V, delivers up to 200 mA output current at 5.0 V with 85% efficiency (Vin = 2.0 V), and integrates power MOSFET, soft-start, voltage reference, and chip enable. It powers compact devices such as digital cameras and handheld instruments requiring stable 5 V from single-cell alkaline or NiMH sources.
For engineers reviewing the NCP1402SN50T1 datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage (0.8 V), regulated 5.0 V ±2.5% output, Thin SOT-23-5 package constraints, CE-controlled shutdown (0.6 µA off-state current), and ripple performance (typ. 30 mV).
Technical Context
The NCP1402SN50T1 implements pulse frequency modulation (PFM) control with variable switching frequency to maintain regulation across wide input voltage ranges (0.3–2.0 V). Its internal architecture includes a PFM oscillator, PFM comparator, soft-start circuit, on-chip feedback resistors set for 5.0 V output, and cycle-by-cycle current limiting with 350 mA peak threshold.
It operates in continuous conduction mode using an integrated N-channel power MOSFET (LX pin), requires only three external components (inductor, diode, output capacitor), and features a dedicated chip enable (CE) pin with hysteresis (enable ≥0.9 V, disable ≤0.3 V) and internal 10 MΩ pullup to OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2.5% - factory-trimmed internal feedback network eliminates external resistor divider; supports fixed 5 V rail for microcontrollers or sensors. |
| Startup Voltage | 0.8 V typ. - enables operation from nearly depleted single-cell batteries (e.g., 0.8 V alkaline), extending usable battery life. |
| Operating Current | 70 µA typ. (IDD1) - ultra-low quiescent current preserves battery runtime in always-on low-power systems. |
| Efficiency | 85% @ Vin=2.0 V, Vout=5.0 V, Io=70 mA - high conversion efficiency minimizes thermal rise in space-constrained portable PCBs. |
| Ripple Voltage | 30 mV typ. - low output noise ensures clean supply for analog circuits or RF front-ends without additional LDO post-regulation. |
| Shutdown Current | 0.6 µA max. - near-zero leakage during CE disable extends shelf life of battery-powered devices in storage mode. |
| Switch Current Limit | 215 mA min. - protects internal MOSFET and external inductor against saturation under transient overload or short-circuit conditions. |
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 control input | Logic-level enable: ≥0.9 V enables regulator; ≤0.3 V disables it; floating defaults to enabled via internal 10 MΩ pullup to OUT. |
| 2 - OUT | Regulated output voltage & power supply pin | Provides 5.0 V output; also supplies internal circuitry and serves as reference for CE pullup - must be decoupled with ≥10 µF capacitor. |
| 3 - NC | No internal connection | Unbonded pin - must remain unconnected; no routing or soldering required. |
| 4 - GND | Power and signal ground reference | Common return path for input, output, and internal logic; requires low-impedance one-point grounding with C1/C2 to minimize noise coupling. |
| 5 - LX | Switch node for external inductor | Drain of internal N-MOSFET; connects to inductor; switches between ~0.4 V (on) and up to 6.0 V (off); requires short, wide trace to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with exhausted primary cells - critical for long-life remote sensors or medical disposables. |
| Integrated power switch | On-die 215 mA-rated N-MOSFET eliminates external transistor, reducing BOM count and layout area by >30% vs discrete boost solutions. |
| PFM control architecture | Variable-frequency operation maintains high efficiency (>80%) even at light loads (<1 mA), unlike fixed-frequency PWM regulators. |
| Soft-start function | 2.0 ms typical ramp time prevents inrush current into output capacitor - avoids brown-out of upstream power rails during cold start. |
| Chip enable with hysteresis | 0.6 V input threshold window (0.3–0.9 V) ensures noise-immune enable/disable transitions in noisy portable environments. |
Applications
| Digital Cameras | Handheld Instruments |
|---|---|
Use Scenario: Powering image sensor, flash LED driver, and SD card interface from single AA/AAA cell. IC Role / Device Role / Timing Role: Primary 5 V boost regulator supplying regulated rail to CMOS sensor and memory controller. Use Value: 0.8 V startup extracts full energy from alkaline cells; 30 mV ripple avoids image noise in analog pixel readout paths. | Use Scenario: Providing stable 5 V supply to microcontroller, LCD backlight, and precision ADC in portable multimeters or gas detectors. IC Role / Device Role / Timing Role: Main system power converter enabling operation across battery discharge curve (1.5 V → 0.8 V). Use Value: 70 µA operating current extends battery life to >12 months in intermittent-use field instruments. |
| Portable Audio (MP3) | Electronic Games |
Use Scenario: Generating 5 V for audio DAC, headphone amplifier, and NAND flash memory in battery-powered music players. IC Role / Device Role / Timing Role: High-efficiency boost stage preceding low-noise LDOs for analog audio subsystems. Use Value: 85% efficiency at 70 mA reduces thermal load on small PCBs; PFM mode eliminates audible switching noise in audio band. | Use Scenario: Supplying 5 V to game processor, display driver, and vibration motor in handheld gaming devices. IC Role / Device Role / Timing Role: Compact, low-profile power source supporting burst-mode CPU operation and dynamic load transients. Use Value: Fast load transient response (Fig. 49–50) maintains 5 V stability during motor activation; Thin SOT-23-5 fits tight board real estate. |
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 | Fixed 5.0 V output; higher 1.8 A switch current; requires external feedback resistors for non-standard voltages. | Supports higher output current (up to 600 mA) but consumes 100 µA quiescent current - less suitable for ultra-low-power battery life targets. | Select when >200 mA output or wider input range (0.3–5.5 V) is required; not drop-in due to different pinout and enable logic. |
| MAX17222ETA+ | 5.0 V output; 300 mA switch current; 0.75 V startup; 2.5 µA quiescent current in shutdown. | Lower quiescent current in shutdown (2.5 µA vs. 0.6 µA) but lacks CE hysteresis - more sensitive to noise on enable line. | Prefer for longest shelf life; verify CE interface compatibility; requires different inductor value (1 µH vs. 47 µH) and layout rework. |
Compared with TPS61200DRCT and MAX17222ETA+, the NCP1402SN50T1 offers superior ultra-low-voltage startup (0.8 V) and lowest operating current (70 µA) for single-cell applications, while trading off maximum output current and advanced protection features found in newer-generation boost ICs.
Availability
NCP1402SN50T1 is available at Aetrix Electronics and suitable for digital cameras, handheld instruments, portable audio devices, and electronic games requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for NCP1402SN50T1 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP1402 series belongs to onsemi's micropower DC-DC converter product line, engineered specifically for battery-powered portable electronics where minimal startup voltage, ultra-low quiescent current, and minimal external component count are critical design requirements.
FAQ
What is the minimum input voltage required for NCP1402SN50T1 to start regulating?
The NCP1402SN50T1 has a typical minimum startup voltage of 0.8 V, with a maximum of 0.95 V across temperature. This allows the device to begin regulation from nearly depleted single-cell alkaline or NiMH batteries. The hold voltage remains functional down to 0.3 V, enabling extended runtime beyond conventional boost converters. NCP1402SN50T1 achieves this via optimized PFM oscillator and low-threshold internal circuitry.
How does the CE pin function on the NCP1402SN50T1?
The CE pin on the NCP1402SN50T1 controls device enable/disable state with defined thresholds: ≥0.9 V enables normal operation, ≤0.3 V forces shutdown drawing only 0.6 µA, and floating defaults to enabled via internal 10 MΩ pullup to the OUT pin. Applying voltages between 0.3 V and 0.9 V is prohibited due to undefined hysteresis behavior. NCP1402SN50T1 uses this for battery-saving sleep modes in portable systems.
What external components are required to implement a working NCP1402SN50T1 circuit?
A functional NCP1402SN50T1 circuit requires exactly three external components: a 47 µH shielded inductor (e.g., Sumida CD54-470L), a Schottky diode (e.g., MBR0520LT1), and a 68 µF low-ESR output capacitor (e.g., KEMET T494D686K010AS). An optional 10 µF input capacitor improves source stability. No feedback resistors are needed - NCP1402SN50T1's 5.0 V output is internally trimmed.
What is the typical output ripple voltage of the NCP1402SN50T1 under load?
The NCP1402SN50T1 delivers typical output ripple voltage of 30 mV under standard test conditions (Vin = 1.2 V, Io = 30 mA, L = 47 µH, COUT = 68 µF, TA = 25°C), as shown in Figure 53 of the datasheet. Ripple increases with higher load current and lower input voltage but remains below 60 mV across its full operating range. NCP1402SN50T1's PFM architecture inherently limits worst-case ripple compared to fixed-frequency alternatives.
Is the NCP1402SN50T1 RoHS compliant and lead-free?
Yes, the NCP1402SN50T1 is Pb-free and fully RoHS compliant, as explicitly stated in the "Features" section of the official onsemi datasheet (Publication Order Number NCP1402/D, Rev. 10). The Thin SOT-23-5 package (Case 483) carries the "Pb-Free Package" marking per onsemi's standard packaging protocol. NCP1402SN50T1 meets JEDEC J-STD-020A MSL 1 moisture sensitivity requirements.
NCP1402SN50T1 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):
- 5V
- Voltage - Output (Min/Fixed):
- 5V
- 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
NCP1402SN50T1 FAQ
1.How can I place an order for NCP1402SN50T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN50T1 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 NCP1402SN50T1 reliable?
The price and inventory of NCP1402SN50T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN50T1 is usually 5 days.
3.What payment methods are accepted for NCP1402SN50T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN50T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN50T1?
NCP1402SN50T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN50T1 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 NCP1402SN50T1?
For technical support, including NCP1402SN50T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN50T1 requirements.
6.How does Aetrix verify that NCP1402SN50T1 is sourced from the original manufacturer or authorized distributors?
All NCP1402SN50T1 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 NCP1402SN50T1 meets industry standards.
7.What is the process for return or replacement of NCP1402SN50T1?
All NCP1402SN50T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN50T1, 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 NCP1402SN50T1 part is unused and in its original packaging.
Return procedure for NCP1402SN50T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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