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onsemi NCP1402SN27T1G
- Part No.:
- NCP1402SN27T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1402SN27T1G.pdf
- Description:
- IC REG BOOST 2.7V 130MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,326
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Product details
Overview
NCP1402SN27T1G from onsemi is a monolithic micropower PFM step-up DC-DC switching regulator designed for ultra-low-voltage battery-powered portable systems. 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 control - enabling compact boost conversion in handheld instruments and MP3 players.
For engineers reviewing the NCP1402SN27T1G datasheet, pinout, applications, or equivalent options, key selection criteria include startup voltage margin under aging batteries, PFM efficiency at light loads, CE-controlled shutdown current (≤1.0 µA), and compatibility with 47 µH inductors and Schottky diodes in space-constrained SOT-23-5 layouts.
Technical Context
The NCP1402SN27T1G implements pulse frequency modulation (PFM) with variable switching frequency, operating in continuous conduction mode. Its internal architecture includes an on-chip N-channel power MOSFET (rated 6.0 V drain voltage, 130 mA typical on-state sink current), integrated feedback resistors for fixed 2.7 V output, and a VLX limiter that enforces current limit protection by monitoring switch drain voltage.
Startup and hold behavior is defined by dedicated thresholds: minimum startup voltage is 0.8 V (typical), holding voltage is ≤0.3 V, and CE pin logic uses 0.9 V high threshold / 0.3 V low threshold with hysteresis - requiring external drive outside the 0.3–0.9 V indeterminate zone to ensure deterministic enable/disable states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.7 V ±2.5% - factory-trimmed internal feedback network eliminates external resistor selection for fixed 2.7 V regulation. |
| Startup Voltage | 0.8 V (typical) - enables operation from single alkaline or NiMH cells even after significant discharge. |
| Operating Current | 39 µA (typical at VOUT = 2.7 V × 0.96) - ultra-low quiescent current preserves battery life in standby. |
| Shutdown Current | 0.6 µA (typical, VCE = 0 V) - achieved via CE pin disable, critical for long-term storage or sleep modes. |
| Efficiency | 85% (at Vin = 2.0 V, VOUT = 2.7 V, IO = 70 mA) - high light-load efficiency due to PFM control and low MOSFET RDS(on). |
| Output Ripple | Typical 30 mV - low noise performance suitable for analog and RF subsystems without additional LDO post-regulation. |
| Switch Current Limit | 130 mA (typical, VLX = 0.4 V) - cycle-by-cycle current limiting protects internal FET and prevents inductor saturation. |
Pinout & Package
Package: Thin SOT-23-5 (TSOP-5, Case 483), Pb-free and RoHS compliant, footprint compatible with standard SOT-23 pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable control input | Active-high logic: ≥0.9 V enables regulation; ≤0.3 V disables (0.6 µA shutdown current); floating defaults to enabled via internal 10 MΩ pullup to OUT. |
| 2 - OUT | Regulated output voltage supply pin | Provides 2.7 V output and serves as power rail for internal circuitry; also connects internal CE pullup resistor. |
| 3 - NC | No internal connection | Unbonded pad - must be left unconnected; no electrical function or thermal path. |
| 4 - GND | Power ground reference | Common return for input, output, and internal control circuits; requires low-impedance single-point grounding per layout guidelines. |
| 5 - LX | Switch node connection | Drain of internal N-channel MOSFET; connects externally to inductor and Schottky diode anode; switches between ~0.4 V (on) and up to 6.0 V (off). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.8 V enables use with deeply discharged single-cell batteries - extends usable runtime in wearables and remote sensors. |
| Integrated power switch | On-die 130 mA N-channel MOSFET eliminates external transistor, reducing BOM count and PCB area in portable designs. |
| Soft-start circuit | 2.0 ms typical ramp time prevents inrush current and stabilizes output during power-on - avoids brownout in downstream logic. |
| PFM control architecture | Variable-frequency operation maintains >80% efficiency from 1 mA to 200 mA load - superior light-load performance vs. PWM regulators. |
| Chip enable with pullup | Internal 10 MΩ CE-to-OUT resistor allows simple on/off control with one GPIO; eliminates need for external bias components. |
Applications
| Portable Audio Power Supply | Low-Power Sensor Node |
|---|---|
|
Use Scenario: Powering DACs, headphone amplifiers, and flash memory in MP3 players using a single 1.5 V alkaline cell. IC Role / Device Role / Timing Role: Step-up regulator generating stable 2.7 V rail from decaying input (0.8–1.5 V), synchronized to audio playback duty cycle. Use Value: 39 µA operating current and 0.6 µA shutdown current extend battery life beyond 20 hours of playback; 30 mV ripple avoids audible noise coupling. |
Use Scenario: Supplying 2.7 V to ultra-low-power microcontrollers and environmental sensors in wireless IoT nodes powered by coin cells. IC Role / Device Role / Timing Role: Primary power converter activated only during sensor readout bursts; CE pin gated by MCU GPIO to minimize idle consumption. Use Value: 0.3 V hold voltage allows full utilization of CR2032 capacity (down to 0.9 V nominal); PFM efficiency >82% at 100 µA load preserves battery for multi-year deployments. |
| Handheld Test Instrument | Digital Camera Backlight Driver |
|
Use Scenario: Providing regulated 2.7 V for LCD controller and precision ADC in pocket-sized multimeters. IC Role / Device Role / Timing Role: Main DC-DC stage converting 1.2–1.5 V NiMH pack voltage to clean 2.7 V reference rail, with fast transient response to measurement triggers. Use Value: Load transient recovery <50 µs (per Fig. 47) ensures stable ADC reference during sampling; ±2.5% output accuracy meets 12-bit measurement requirements. |
Use Scenario: Boosting voltage for white LED backlight strings in compact digital cameras using two AA cells. IC Role / Device Role / Timing Role: Pre-regulator feeding constant-current LED driver IC; operates in discontinuous mode during low-brightness settings. Use Value: 200 mA peak capability supports 3×LED strings at 60 mA each; 47 µH inductor compatibility enables <5 mm² solution size on main PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992RTER | Higher 300 mA output current; 0.7 V startup; integrated 1.5 A switch; requires external compensation. | Better suited for higher-current loads (e.g., Wi-Fi modules); less optimal for ultra-low-IQ battery longevity. | Select when >200 mA output or sub-0.8 V startup is required; verify loop stability with external RC network. |
| MAX17222ETA+T | 0.4 V startup; 1.2 µA shutdown current; 2.3 V fixed output; smaller 6-bump WLP package. | Ideal for space-constrained coin-cell devices; lacks CE pin - enabled by VIN presence only. | Choose for minimal footprint and lowest shutdown IQ; avoid if active enable/disable control is needed. |
Compared with TPS610992RTER and MAX17222ETA+T, the NCP1402SN27T1G offers the best balance of ultra-low startup voltage (0.8 V), integrated CE control, and proven 2.7 V accuracy (±2.5%) - making it optimal for cost-sensitive, battery-powered consumer electronics where predictable enable timing and moderate output current are primary requirements.
Availability
NCP1402SN27T1G is available at Aetrix Electronics and suitable for portable audio, handheld instrumentation, low-power sensor nodes, and digital camera subsystems requiring stable component supply across production lifecycles.
Supply support for NCP1402SN27T1G 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 silicon solutions for automotive, industrial, cloud, medical, and edge applications.
The NCP1402SN27T1G belongs to onsemi's micropower DC-DC converter product line, engineered specifically for battery-powered portable electronics where extended runtime, small form factor, and reliable low-voltage operation are essential design constraints.
FAQ
What is the minimum input voltage required for the NCP1402SN27T1G to start switching?
The NCP1402SN27T1G has a typical minimum startup voltage of 0.8 V, with a maximum of 0.95 V across temperature. This allows reliable operation from a single partially discharged alkaline or NiMH cell. Startup voltage is measured at zero load current and decreases slightly with rising temperature (−1.6 mV/°C coefficient). Below 0.3 V, the device ceases regulation but retains state.
How does the CE pin on the NCP1402SN27T1G behave when left unconnected?
When the CE pin of the NCP1402SN27T1G is left floating, an internal 10 MΩ pullup resistor connects it to the OUT pin, resulting in automatic enablement. The device enters normal regulation mode as long as OUT voltage reaches ≥0.9 V. This simplifies designs where always-on operation is acceptable and eliminates external bias components.
Can the NCP1402SN27T1G drive a 200 mA load continuously at 2.7 V output?
Yes - the NCP1402SN27T1G is rated for up to 200 mA output current when Vin = 2.0 V and VOUT = 2.7 V, achieving 85% efficiency under those conditions. At lower input voltages (e.g., Vin = 1.2 V), maximum sustainable current drops to ~120 mA due to duty cycle and switch current limits. Thermal derating applies above +85°C ambient.
What external components are mandatory for basic operation of the NCP1402SN27T1G?
Three external components are mandatory: a 47 µH power inductor (e.g., Sumida CD54-470L), a Schottky diode (e.g., MBR0520LT1), and an output capacitor (47–68 µF low-ESR tantalum or ceramic). An input capacitor (10 µF) is strongly recommended for source stabilization but not strictly mandatory in low-noise, low-impedance battery configurations.
Is the NCP1402SN27T1G RoHS compliant and lead-free?
Yes - the NCP1402SN27T1G is manufactured in a Pb-free process and complies with RoHS Directive 2011/65/EU. The "G" suffix in the part number explicitly denotes lead-free packaging. The Thin SOT-23-5 package (Case 483) uses matte tin plating and meets JEDEC J-STD-020A moisture sensitivity level MSL 1.
NCP1402SN27T1G 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
NCP1402SN27T1G FAQ
1.How can I place an order for NCP1402SN27T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1402SN27T1G 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 NCP1402SN27T1G reliable?
The price and inventory of NCP1402SN27T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1402SN27T1G is usually 5 days.
3.What payment methods are accepted for NCP1402SN27T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1402SN27T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1402SN27T1G?
NCP1402SN27T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1402SN27T1G 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 NCP1402SN27T1G?
For technical support, including NCP1402SN27T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1402SN27T1G requirements.
6.How does Aetrix verify that NCP1402SN27T1G is sourced from the original manufacturer or authorized distributors?
All NCP1402SN27T1G 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 NCP1402SN27T1G meets industry standards.
7.What is the process for return or replacement of NCP1402SN27T1G?
All NCP1402SN27T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1402SN27T1G, 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 NCP1402SN27T1G part is unused and in its original packaging.
Return procedure for NCP1402SN27T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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