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onsemi NCP1402SN27T1
- Part No.:
- NCP1402SN27T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN27T1.pdf
- Description:
- IC REG BOOST 2.7V 130MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,074
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Product details
Overview
NCP1402SN27T1 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 current at 2.0 V input/2.7 V output, and integrates power MOSFET, soft-start, voltage reference, and chip enable - all in a Thin SOT-23-5 package.
For engineers reviewing the NCP1402SN27T1 datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage margin under aging batteries, PFM efficiency at light loads, output voltage accuracy (±2.5%), ripple performance (typ. 30 mV), and CE-controlled shutdown current (≤1.0 µA).
Technical Context
The NCP1402SN27T1 implements pulse frequency modulation (PFM) with variable switching frequency to maintain high efficiency across wide load ranges - especially critical below 10 mA where PWM converters suffer disproportionate quiescent loss. Its internal 2.7 V regulated output is set by factory-trimmed feedback resistors, eliminating external resistor networks.
Operation relies on cycle-by-cycle current limiting via VLX voltage monitoring (threshold = 0.65 V), soft-start timing (~2.0 ms to 0.8 V), and a dedicated LX pin driving an external inductor. The CE pin enables deterministic shutdown with hysteresis (enable ≥0.9 V, disable ≤0.3 V), and the NC pin has no internal connection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.7 V ±2.5% - factory-trimmed internal feedback ensures stable regulation without external resistors. |
| Startup Voltage | 0.8 V typ. - enables operation from single alkaline or NiMH cells even at end-of-life discharge. |
| Operating Current (IDD1) | 39 µA typ. at VOUT = 2.7 V × 0.96 - ultra-low quiescent current preserves battery life in standby. |
| Efficiency | 85% at Vin = 2.0 V, VOUT = 2.7 V, IOUT = 70 mA - optimized PFM architecture minimizes switching loss at medium loads. |
| LX Pin Current Limit | 130 mA typ. - cycle-by-cycle current limiting protects internal MOSFET and prevents inductor saturation. |
| Output Ripple | Typ. 30 mV - low noise performance suitable for RF-sensitive analog and audio circuits. |
| Shutdown Current (IOFF) | 0.6 µA typ. at VCE = 0 V - enables multi-year shelf life in battery-critical applications like remote sensors. |
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 control input | Logic-high (≥0.9 V) enables regulation; logic-low (≤0.3 V) disables IC, reducing current to ≤1.0 µA; floating defaults to enabled. |
| 2 - OUT | Regulated output voltage supply | Provides 2.7 V output; also powers internal circuitry and pulls up CE via internal 10 MΩ resistor. |
| 3 - NC | No internal connection | Not bonded; must be left unconnected - no routing or grounding required. |
| 4 - GND | Power and signal ground reference | Single-point ground connection essential for noise control; ties together input capacitor, output capacitor, and LX return path. |
| 5 - LX | Switch node for external inductor | Drives external 47 µH inductor; internal N-channel MOSFET drain; voltage swings between ~0 V and VOUT + VF. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with single-cell batteries at deep discharge - extends usable battery capacity by >20% vs. 1.0 V alternatives. |
| Integrated soft-start | 2.0 ms typical ramp to 0.8 V prevents inrush current and stabilizes output during cold start from weak sources. |
| PFM control architecture | Variable-frequency operation maintains >80% efficiency from 0.1 mA to 200 mA - eliminates light-load inefficiency of fixed-frequency PWM. |
| Chip enable with hysteresis | Deterministic enable/disable thresholds (0.9 V / 0.3 V) prevent oscillation during slow-rising control signals - simplifies GPIO interfacing. |
| Internal current limit protection | 130 mA typ. cycle-by-cycle limiting prevents thermal runaway during short-circuit or overload - no external sense resistor needed. |
Applications
| Wireless Remote Sensors | Low-Power Wearables |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Step-up regulator supplying stable 2.7 V to BLE SoC and sensor ICs from aging 1.2 V NiMH cell. Use Value: 0.8 V startup and 39 µA operating current enable >3-year battery life; 30 mV ripple avoids RF interference with BLE transmission. |
Use Scenario: Fitness tracker with OLED display, accelerometer, and heart-rate monitor powered by coin cell. IC Role / Device Role / Timing Role: Primary voltage rail generator delivering 2.7 V to display driver and MCU from 1.5 V button cell. Use Value: Thin SOT-23-5 footprint fits tight space constraints; CE-controlled shutdown reduces system standby current to sub-µA level. |
| Portable Medical Monitors | Handheld Barcode Scanners |
Use Scenario: Pocket-sized blood oxygen (SpO₂) meter using LED array and photodiode requiring stable 2.7 V bias. IC Role / Device Role / Timing Role: Precision voltage source for optical subsystem, immune to battery voltage sag during LED pulses. Use Value: ±2.5% output accuracy ensures consistent LED intensity and photodiode response; low ripple prevents signal noise in analog front-end. |
Use Scenario: Rugged handheld scanner with laser diode, CMOS imager, and Bluetooth radio powered by dual AA cells. IC Role / Device Role / Timing Role: Boost converter maintaining 2.7 V rail during high-current laser activation and image capture bursts. Use Value: 130 mA current limit handles 100 mA laser peak loads without shutdown; 200 mA capability supports future higher-resolution imagers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992DRVR | Higher 300 mA output, but requires 0.9 V min. startup; 1.2 µA shutdown current vs. 0.6 µA. | Better for higher-current loads; less suitable for ultra-deep-discharge single-cell use. | Choose if >200 mA peak current is required and battery voltage stays above 0.9 V. |
| MAX17222ETA+T | 2.7 V output variant available; 0.75 V startup, 800 nA shutdown current, but only 100 mA max output. | Superior for ultra-low-power, low-current designs; insufficient for 200 mA loads. | Choose when minimizing shutdown current is critical and load current remains ≤100 mA. |
Compared with TPS610992DRVR and MAX17222ETA+T, the NCP1402SN27T1 uniquely balances 0.8 V startup, 200 mA capability, and 39 µA operating current - making it optimal for cost-sensitive, space-constrained portable devices needing robust single-cell support.
Availability
NCP1402SN27T1 is available at Aetrix Electronics and suitable for wireless remote sensors, low-power wearables, and portable medical monitors requiring stable component supply with long-term manufacturability and RoHS compliance.
Supply support for NCP1402SN27T1 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 NCP1402SN27T1 belongs to onsemi's micropower DC-DC converter product line, engineered specifically for battery longevity and minimal board space in portable consumer and medical electronics.
FAQ
What is the minimum input voltage required for NCP1402SN27T1 to start regulation?
The NCP1402SN27T1 has a typical minimum startup voltage of 0.8 V, verified across temperature (−40°C to +85°C) with a coefficient of −1.6 mV/°C. This allows reliable operation from a single NiMH or alkaline cell well into end-of-life discharge, unlike many boost regulators requiring ≥0.9 V.
How does the CE pin function on the NCP1402SN27T1?
The CE pin on the NCP1402SN27T1 enables deterministic on/off control: applying ≥0.9 V enables regulation, ≤0.3 V disables it (reducing current to ≤1.0 µA), and floating defaults to enabled via an internal 10 MΩ pullup to the OUT pin. Voltages between 0.3–0.9 V must be avoided due to undefined hysteresis behavior.
What external components are required to implement a functional NCP1402SN27T1 circuit?
A functional NCP1402SN27T1 design requires only three external components: a 47 µH power inductor (e.g., Sumida CD54-470L), a Schottky diode (e.g., MBR0520LT1), and two capacitors - a 10 µF input (C1) and 68 µF output (C2) low-ESR tantalum or ceramic. No feedback resistors are needed due to internal voltage setting.
What is the maximum continuous output current capability of the NCP1402SN27T1?
The NCP1402SN27T1 delivers up to 200 mA of continuous output current when Vin = 2.0 V and VOUT = 2.7 V, as confirmed in the datasheet's electrical characteristics and Figure 4 (NCP1402SN30T1 output curves, scaled per device suffix). Performance depends on inductor value, PCB layout, and thermal conditions.
Does the NCP1402SN27T1 require special PCB layout considerations?
Yes - the NCP1402SN27T1 requires strict PCB layout practices: single-point grounding of C1-GND, C2-GND, and U1-GND; short/thick traces for LX and GND paths to minimize stray inductance; and placement of C1 (10 µF) and C2 (68 µF) as close as possible to their respective pins to suppress ripple and ensure stability.
NCP1402SN27T1 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):
- 2.7V
- Voltage - Output (Min/Fixed):
- 2.7V
- 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
NCP1402SN27T1 FAQ
1.How can I place an order for NCP1402SN27T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN27T1 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 NCP1402SN27T1 reliable?
The price and inventory of NCP1402SN27T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN27T1 is usually 5 days.
3.What payment methods are accepted for NCP1402SN27T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN27T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN27T1?
NCP1402SN27T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN27T1 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 NCP1402SN27T1?
For technical support, including NCP1402SN27T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN27T1 requirements.
6.How does Aetrix verify that NCP1402SN27T1 is sourced from the original manufacturer or authorized distributors?
All NCP1402SN27T1 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 NCP1402SN27T1 meets industry standards.
7.What is the process for return or replacement of NCP1402SN27T1?
All NCP1402SN27T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN27T1, 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 NCP1402SN27T1 part is unused and in its original packaging.
Return procedure for NCP1402SN27T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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