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onsemi NCP1402SN19T1G
- Part No.:
- NCP1402SN19T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN19T1G.pdf
- Description:
- IC REG BOOST 1.9V 110MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,920
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Product details
Overview
NCP1402SN19T1G from onsemi is a monolithic micropower PFM step-up DC-DC switching regulator optimized for ultra-low-voltage battery-powered portable devices. It starts up at 0.8 V, operates down to 0.3 V, delivers up to 200 mA output current at 1.9 V, achieves 85% efficiency (2.0 V input → 3.0 V/70 mA), and integrates power MOSFET, soft-start, voltage reference, and feedback resistors in a single chip - enabling compact boost conversion in handheld instruments and MP3 players.
For engineers reviewing the NCP1402SN19T1G datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage margin under aging batteries, PFM-mode ripple performance at light loads, CE pin enable threshold tolerance, LX switch current capability at low VIN, and compatibility with 47 µH inductor + Schottky diode external topology.
Technical Context
The NCP1402SN19T1G implements pulse frequency modulation (PFM) control with cycle-by-cycle current limiting, fixed soft-start time (0.3–2.0 ms), and internal feedback network trimmed for 1.9 V ±2.5% output. Its oscillator sets variable on-time (3.6–7.6 µs) and minimum off-time (1.0–1.9 µs), enabling high efficiency across wide load ranges without external compensation.
Operation relies on internal N-channel MOSFET switching (LX pin), with VLX voltage limit (0.45–0.65 V) and on-state sink current rated at 110–145 mA (typical). The CE pin enables shutdown with <0.3 V disable threshold and includes an internal 10 MΩ pullup to OUT, supporting floating-pin "always-on" configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.9 V ±2.5% - factory-trimmed internal feedback ensures stable rail for 1.8 V logic or low-power sensors without external resistors |
| Startup Voltage | 0.8 V (typ) - enables operation from single NiMH/NiCd cells even after deep discharge or at cold temperature |
| Operating Current | 30 µA (typ, VOUT = 1.9 V) - ultra-low quiescent draw extends battery life in standby mode |
| Efficiency | 85% @ 2.0 VIN, 3.0 VOUT, 70 mA - high conversion efficiency minimizes thermal rise in sealed enclosures |
| LX Switch Current | 110–145 mA (typ) - supports 200 mA output with appropriate inductor sizing and layout |
| Output Ripple | Typical 30 mV - low noise critical for analog sensor or audio subsystems powered from same rail |
| CE Input Threshold | ≥0.9 V enable / <0.3 V disable - wide hysteresis prevents oscillation near transition; floating CE defaults to enabled |
Pinout & Package
Package: Thin SOT-23-5 (TSOP-5, Case 483), Pb-free and 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 activates regulator; <0.3 V forces shutdown drawing only 0.6–1.0 µA; floating = enabled via internal 10 MΩ pullup to OUT |
| 2 - OUT | Regulated output voltage supply pin | Primary power output (1.9 V); also supplies internal circuitry and serves as reference for CE pullup |
| 3 - NC | No internal connection | Not bonded; must be left unconnected - no routing or grounding required |
| 4 - GND | Power ground reference | Common return for input, output, and internal circuits; requires low-impedance one-point grounding per layout guidelines |
| 5 - LX | Switch node connection to internal MOSFET drain | Connects to inductor and Schottky diode anode; handles pulsed current up to 145 mA; requires short, wide trace to minimize EMI |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with single-cell alkaline, NiMH, or LiFePO4 batteries at end-of-life |
| Integrated power switch | On-chip N-channel MOSFET eliminates need for external transistor, reducing BOM count and PCB area |
| PFM control architecture | Variable-frequency operation maintains high efficiency (>80%) from 10 µA to 200 mA load without external compensation |
| Low-noise output | Typical 30 mV ripple supports noise-sensitive analog circuits like ADC references or microphone preamps |
| Soft-start function | 0.3–2.0 ms controlled ramp prevents inrush current and output overshoot during power-up |
| Chip enable with pullup | Internal 10 MΩ CE-to-OUT resistor allows simple on/off control or permanent enable via floating pin |
Applications
| Portable Audio Power | Handheld Instrument Supply |
|---|---|
Use Scenario: Powering 1.8 V digital audio codecs and Class D amplifiers in battery-operated MP3 players. IC Role / Device Role / Timing Role: Step-up regulator generating clean 1.9 V rail from depleting 1.2–1.5 V NiMH cell stack. Use Value: Enables >10-hour playback by sustaining regulation down to 0.3 V input while maintaining <30 mV ripple for low THD. |
Use Scenario: Supplying precision analog front-ends and microcontrollers in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering stable 1.9 V for ADC reference and MCU I/O domains. Use Value: Ultra-low 30 µA operating current extends battery life; ±2.5% output accuracy ensures measurement repeatability. |
| Low-Power Sensor Node | Wearable Health Monitor |
Use Scenario: Powering BLE transceivers and environmental sensors (temperature/humidity) in coin-cell–powered IoT nodes. IC Role / Device Role / Timing Role: Micropower boost converter activated intermittently during sensor readout bursts. Use Value: CE-controlled shutdown draws only 0.6–1.0 µA in sleep mode; fast 0.8 V startup ensures reliable wake-up from deep sleep. |
Use Scenario: Generating regulated 1.9 V for optical heart-rate sensors and low-power MCUs in wrist-worn health bands. IC Role / Device Role / Timing Role: Compact, thin-profile voltage booster integrated into space-constrained flex PCB assemblies. Use Value: Thin SOT-23-5 package (0.95 mm height) fits behind curved displays; PFM mode avoids audible switching noise during optical sensing. |
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 3.3 V fixed output; 0.3 V startup; 1.2 A switch current; requires external feedback for 1.9 V | Better suited for higher-current 3.3 V rails; not drop-in for 1.9 V systems | Select if output voltage flexibility and higher current headroom outweigh board area and cost constraints |
| MAX17222ELT+T | 1.8 V output option; 0.4 V startup; 400 mA switch current; integrated Schottky; 0.9 µA shutdown current | Superior ultra-low-IQ and integrated diode reduce component count but increase cost and footprint | Prefer when minimizing external components and achieving sub-1 µA shutdown is critical |
Compared with TPS61200DRCT and MAX17222ELT+T, the NCP1402SN19T1G offers the lowest bill-of-materials count for 1.9 V applications, smallest footprint among alternatives, and optimal balance of startup voltage, efficiency, and cost for sub-200 mA portable designs.
Availability
NCP1402SN19T1G is available at Aetrix Electronics and suitable for portable audio, handheld instrumentation, and low-power sensor node applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for NCP1402SN19T1G 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, delivering silicon solutions 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-constrained portable equipment where startup voltage, quiescent current, and minimal external component count are primary system requirements.
FAQ
What is the minimum input voltage required for NCP1402SN19T1G to start switching?
The NCP1402SN19T1G has a typical minimum startup voltage of 0.8 V and a maximum of 0.95 V at 25°C. It can initiate regulation from a single depleted NiMH cell or low-voltage lithium chemistry. Startup voltage varies with temperature (−1.6 mV/°C coefficient), so design margin below 0.8 V is recommended for −40°C operation. The NCP1402SN19T1G sustains regulation down to 0.3 V once started.
Can NCP1402SN19T1G be used with a 22 µH inductor instead of the recommended 47 µH?
No - the NCP1402SN19T1G datasheet explicitly states that inductors below 27 µH are not recommended due to internal switch limitations. Using 22 µH risks exceeding peak current limits, causing premature current-limit triggering, reduced efficiency, and increased output ripple. The 47 µH value is optimized for continuous conduction mode, 200 mA output, and minimal size; 33 µH is the lowest validated alternative.
What happens if the CE pin of NCP1402SN19T1G is held at 0.6 V?
Holding the CE pin of NCP1402SN19T1G at 0.6 V places it within the undefined hysteresis range (0.3–0.9 V), resulting in indeterminate device state - the regulator may oscillate between enabled and disabled, cause erratic output voltage, or draw excessive current. The NCP1402SN19T1G specification mandates applying either ≥0.9 V (enabled) or ≤0.3 V (disabled); floating CE is safe and defaults to enabled via internal pullup.
Does NCP1402SN19T1G require an external Schottky diode, and what are the key selection criteria?
Yes - the NCP1402SN19T1G requires an external Schottky diode (e.g., MBR0520LT1) connected between LX and VOUT. Critical selection criteria include forward voltage <0.3 V (to minimize loss), reverse leakage <1 µA, reverse recovery time <10 ns, rated current > peak inductor current (≥350 mA), and reverse voltage rating >1.9 V. Low-capacitance, low-ESR ceramic or tantalum output capacitors (47–68 µF) are also mandatory for stability.
How does the output voltage accuracy of NCP1402SN19T1G affect system-level tolerance budgets?
The NCP1402SN19T1G guarantees output voltage accuracy of ±2.5% over temperature (−40°C to +85°C) and line/load conditions. This translates to ±47.5 mV tolerance around 1.9 V, directly impacting downstream analog circuits - e.g., ADC reference stability, sensor biasing accuracy, or LDO dropout margins. System designers must allocate this ±2.5% as a hard bound in total error budgets, especially for 12-bit+ precision applications.
NCP1402SN19T1G 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
NCP1402SN19T1G FAQ
1.How can I place an order for NCP1402SN19T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN19T1G 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 NCP1402SN19T1G reliable?
The price and inventory of NCP1402SN19T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN19T1G is usually 5 days.
3.What payment methods are accepted for NCP1402SN19T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN19T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN19T1G?
NCP1402SN19T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN19T1G 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 NCP1402SN19T1G?
For technical support, including NCP1402SN19T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN19T1G requirements.
6.How does Aetrix verify that NCP1402SN19T1G is sourced from the original manufacturer or authorized distributors?
All NCP1402SN19T1G 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 NCP1402SN19T1G meets industry standards.
7.What is the process for return or replacement of NCP1402SN19T1G?
All NCP1402SN19T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN19T1G, 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 NCP1402SN19T1G part is unused and in its original packaging.
Return procedure for NCP1402SN19T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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