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onsemi NCP1402SN19T1
- Part No.:
- NCP1402SN19T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN19T1.pdf
- Description:
- IC REG BOOST 1.9V 110MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,592
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Product details
Overview
NCP1402SN19T1 from onsemi is a monolithic micropower step-up DC-DC converter optimized for single-cell battery-powered portable electronics. It delivers up to 200 mA output current at 1.9 V with 85% efficiency (Vin = 2.0 V), starts up from 0.8 V input, operates down to 0.3 V, and integrates PFM control, soft-start, voltage reference, feedback resistors, driver, and power MOSFET in a Thin SOT-23-5 package.
For engineers reviewing the NCP1402SN19T1 datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low startup voltage, chip enable shutdown capability, ±2.5% output accuracy, low 30 mV typical ripple, and compatibility with minimal external components (inductor, diode, two capacitors).
Technical Context
The NCP1402SN19T1 implements pulse frequency modulation (PFM) control in voltage-mode architecture, operating in continuous conduction mode. Its internal PFM oscillator sets switch on-time (typ. 5.5 µs) and minimum off-time (typ. 1.45 µs), with maximum duty cycle of 78% at 25°C.
Regulation is achieved via an on-chip feedback resistor network trimmed for 1.9 V nominal output (1.853–1.948 V range), with 150 ppm/°C temperature coefficient. The CE pin enables/disables operation using a defined hysteresis window (enable ≥ 0.9 V, disable < 0.3 V), and the LX pin connects directly to the drain of the integrated N-channel power MOSFET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.9 V nominal (1.853–1.948 V, ±2.5% tolerance); fixed by internal resistor network |
| Startup Voltage | 0.8 V typical (min 0.3 V hold voltage); enables operation from near-dead alkaline or NiMH cells |
| Efficiency | 85% at Vin = 2.0 V, VOUT = 1.9 V, IO = 70 mA; enables extended runtime in low-power devices |
| Operating Current | 30 µA typical at VOUT = 1.9 V; supports micropower system design |
| Output Ripple | Typical 30 mV; ensures stable supply for noise-sensitive analog or RF circuitry |
| Switch Current Limit | 110 mA typical (ILX); protects internal FET and prevents inductor saturation under overload |
| Soft-Start Time | 2.0 ms typical (VOUT from 0 to 0.8 V); prevents inrush current and output overshoot |
Pinout & Package
Package: Thin SOT-23-5 (Case 483, TSOP-5/SC59-5), Pb-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable input | Active-high enable (≥0.9 V); floating defaults to enabled; <0.3 V disables IC, reducing current to 0.6 µA |
| 2 - OUT | Power supply and output voltage monitor | Supplies internal circuitry; connects to regulated output node; used as reference for CE pull-up |
| 3 - NC | No internal connection | Must be left unconnected; no electrical function or thermal path |
| 4 - GND | Ground reference | Common return for power and signal paths; requires low-impedance PCB connection |
| 5 - LX | Power switch drain terminal | Connects to external inductor; carries high-frequency switching current; voltage limited to 6.0 V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with partially discharged primary batteries or energy-harvesting sources |
| Integrated power switch | On-chip N-channel MOSFET eliminates need for external switch, reducing BOM and layout complexity |
| Chip enable with hysteresis | Defined CE threshold (0.9 V enable / <0.3 V disable) prevents erratic operation during slow-rising control signals |
| Fixed 1.9 V output | Factory-trimmed internal feedback avoids external resistor network, improving accuracy and saving board space |
| Low-noise PFM operation | Variable-frequency control minimizes EMI compared to fixed-frequency PWM, easing EMC compliance |
Applications
| Portable Audio Devices | Digital Cameras |
|---|---|
Use Scenario: Powering low-voltage audio codecs or flash memory in MP3 players with single AA/AAA cells. IC Role / Device Role / Timing Role: Step-up regulator generating stable 1.9 V rail from decaying 0.8–1.5 V battery input. Use Value: Enables full functionality down to 0.3 V battery voltage, extending playback time by >25% versus higher-startup alternatives. | Use Scenario: Supplying image sensor bias or memory interface voltage in compact digital cameras. IC Role / Device Role / Timing Role: Micropower boost converter delivering regulated 1.9 V with <30 mV ripple for noise-sensitive analog front-end circuits. Use Value: Maintains sensor SNR and image quality across battery discharge curve without requiring voltage-margin headroom. |
| Handheld Medical Instruments | Wireless Remote Controls |
Use Scenario: Providing precise 1.9 V supply to microcontroller peripherals and display drivers in portable glucose meters. IC Role / Device Role / Timing Role: Low-quiescent-current DC-DC converter with CE-controlled shutdown for intermittent measurement cycles. Use Value: Reduces average system current to sub-µA during sleep, enabling multi-year battery life on coin cells. | Use Scenario: Generating 1.9 V logic supply for RF transceivers and MCU in infrared or sub-GHz remotes. IC Role / Device Role / Timing Role: Efficient boost regulator supporting burst-mode transmission from 1.2 V NiMH cells. Use Value: Delivers 200 mA peak current for RF transmit pulses while maintaining >80% efficiency at light loads. |
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 1.8 V output; 350 mA max output; 2.5 µA quiescent current; requires external feedback resistors for non-standard voltages | Higher output current but less accurate (±3%) and no factory-trimmed 1.9 V option | Select when >150 mA load current is required and 1.8 V is acceptable; verify CE timing compatibility |
| MAX1703EUT+T | Fixed 1.8 V output; 150 mA max; 19 µA quiescent current; no CE pin; requires external feedback for 1.9 V | Lacks enable control and has lower current capability; not suitable for CE-gated power sequencing | Choose only if CE functionality is unnecessary and 1.8 V matches system requirements; confirm thermal derating at 85°C |
Compared with TPS61200DRCT and MAX1703EUT+T, the NCP1402SN19T1 uniquely provides factory-trimmed 1.9 V output with ±2.5% accuracy, 0.8 V startup, and integrated CE hysteresis-making it optimal for space-constrained, single-cell portable designs requiring precise low-voltage rails.
Availability
NCP1402SN19T1 is available at Aetrix Electronics and suitable for portable audio devices, digital cameras, handheld medical instruments, and wireless remote controls requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for NCP1402SN19T1 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 electronics, with leadership in power management, analog, sensors, and connectivity solutions.
The NCP1402 series belongs to onsemi's micropower DC-DC converter product line, designed specifically for ultra-low-input-voltage battery-powered portable equipment where extended runtime and minimal external components are critical.
FAQ
What is the minimum input voltage required for the NCP1402SN19T1 to start regulation?
The NCP1402SN19T1 has a typical minimum startup voltage of 0.8 V (with a maximum of 0.95 V) at zero load. This allows reliable operation from nearly depleted alkaline, NiMH, or lithium primary cells. The device continues regulation down to 0.3 V input, making it ideal for deep-discharge battery applications where other regulators fail.
How does the CE pin on the NCP1402SN19T1 behave when left unconnected?
When the CE pin of the NCP1402SN19T1 is left floating, an internal 10 MΩ pull-up resistor connects it to the OUT pin, resulting in automatic enablement. This default-on behavior simplifies designs where continuous operation is required without external control logic.
What is the output voltage accuracy and temperature drift of the NCP1402SN19T1?
The NCP1402SN19T1 provides a nominal 1.9 V output with ±2.5% initial accuracy over process and temperature. Its output voltage exhibits a temperature coefficient of 150 ppm/°C across −40°C to +85°C, ensuring stable regulation in consumer and industrial environments without external trimming.
Can the NCP1402SN19T1 drive a 200 mA load at 1.9 V from a 1.2 V input?
Yes-the NCP1402SN19T1 is rated for up to 200 mA output current at VOUT = 1.9 V and Vin = 2.0 V. At Vin = 1.2 V, output current capability drops due to reduced duty cycle margin and increased conduction losses; Figure 3 shows ~120 mA achievable at 1.9 V with 1.2 V input and 47 µH inductor under typical conditions.
What external components are mandatory for basic operation of the NCP1402SN19T1?
Four mandatory external components are required: (1) a 47 µH inductor (L1) between LX and VIN, (2) a Schottky diode (D1) from LX to VOUT, (3) a 10 µF input capacitor (C1) from VIN to GND, and (4) a 68 µF output capacitor (C2) from VOUT to GND. No feedback resistors are needed-the 1.9 V setpoint is internal and factory-trimmed.
NCP1402SN19T1 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):
- 1.9V
- Voltage - Output (Min/Fixed):
- 1.9V
- Voltage - Output (Max):
- -
- Current - Output:
- 110mA (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
NCP1402SN19T1 FAQ
1.How can I place an order for NCP1402SN19T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN19T1 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 NCP1402SN19T1 reliable?
The price and inventory of NCP1402SN19T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN19T1 is usually 5 days.
3.What payment methods are accepted for NCP1402SN19T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN19T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN19T1?
NCP1402SN19T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN19T1 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 NCP1402SN19T1?
For technical support, including NCP1402SN19T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN19T1 requirements.
6.How does Aetrix verify that NCP1402SN19T1 is sourced from the original manufacturer or authorized distributors?
All NCP1402SN19T1 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 NCP1402SN19T1 meets industry standards.
7.What is the process for return or replacement of NCP1402SN19T1?
All NCP1402SN19T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN19T1, 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 NCP1402SN19T1 part is unused and in its original packaging.
Return procedure for NCP1402SN19T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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