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onsemi NCP1403SNT1G
- Part No.:
- NCP1403SNT1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1403SNT1G.pdf
- Description:
- IC REG BOOST ADJ 50MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
NCP1403SNT1G from onsemi is a monolithic PFM step-up DC-DC converter with integrated 16 V N-channel MOSFET, designed to boost single Li-ion or dual AA/AAA battery inputs (1.2–5.5 V) to up to 15 V output at 50 mA. It features chip enable (CE), 1.3 V minimum startup voltage, and operates in TSOP-5 package for space-constrained handheld applications including LCD bias and white LED driving.
For engineers reviewing the NCP1403SNT1G datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world operating parameters, validated alternative options, and design-critical package and pin functionality - all grounded in the official NCP1403/D Rev. 7 datasheet.
Technical Context
The NCP1403SNT1G implements a pulse-frequency modulation (PFM) control architecture with fixed maximum on-time (6.0 µs typ.) and minimum off-time (1.3 µs typ.), enabling variable switching frequency up to 300 kHz depending on load and input conditions. Its internal 16 V MOSFET switch supports output voltages up to 15 V while incorporating LX current-limit protection triggered at 0.75 V across the switch.
Regulation is achieved via feedback comparator comparing FB pin voltage against a trimmed 0.8 V reference (±5%). The CE pin provides active-low shutdown with 0.3 µA typical off-state current, and the device includes soft-start circuitry to limit output overshoot during startup under heavy loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Up to 15 V - set externally via FB resistor divider; limited by internal 16 V MOSFET breakdown rating. |
| Max Output Current | 50 mA at VOUT = 15 V - achievable with 47 µH inductor and optimal layout per Figure 1. |
| Startup Voltage | 1.3 V typical - enables operation from near-dead alkaline or low-SOC Li-ion cells. |
| Efficiency | 82% at 15 V/50 mA/5.0 V input - critical for battery runtime in portable devices. |
| Quiescent Current | 19 µA (no switching) - minimizes standby drain in always-on systems. |
| Shutdown Current | 0.3 µA - ensures ultra-low leakage when CE < 0.3 V. |
| Switching Frequency | Up to 300 kHz - allows compact external magnetics and reduces EMI fundamental. |
Pinout & Package
Package: TSOP-5 (Micro Miniature, Pb-Free), case 483, 0.95 mm max height. Pin 1 marked with microdot or laser etch; pin 1 is top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable input | Active-high logic: ≥0.9 V enables regulation; ≤0.3 V forces shutdown; floating defaults to enabled via internal 100 nA pullup. |
| 2 - FB | Inverting input of PFM comparator | Monitors output via external resistor divider; 0.8 V reference sets VOUT = 0.8 × (1 + RFB1/RFB2). |
| 3 - VDD | Power supply for internal circuitry | Accepts 1.2–5.5 V; powers control logic, reference, and gate driver - not connected to LX switch path. |
| 4 - GND | Analog and power ground reference | Single-point return for FB divider, CE, VDD, and internal circuits; must be routed separately from high-current LX loop. |
| 5 - LX | Switch node connection | Drives external inductor; open-drain N-MOSFET source connects to GND when on; peak voltage up to 16 V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 16 V N-channel MOSFET | Enables 15 V output from ≤5.5 V input without external high-voltage switch - simplifies BOM and layout. |
| PFM control with variable frequency | Maintains high efficiency (>75%) down to 1 mA load - ideal for intermittent-display or sensor-burst applications. |
| 1.3 V minimum startup voltage | Supports full regulation from single-cell alkaline batteries at end-of-life (~1.2 V) with margin. |
| 0.3 µA shutdown current | Extends shelf life and standby time in battery-powered instruments and remote controls. |
| Soft-start circuitry | Prevents output overshoot and inrush stress on output capacitors during cold start or load transients. |
Applications
| LCD Bias Supply | White LED Driver |
|---|---|
Use Scenario: Generating ±15 V for TFT-LCD panel gate/source drivers in PDAs and handheld instruments. IC Role / Device Role / Timing Role: Primary step-up regulator delivering stable 15 V positive rail; used in conjunction with charge-pump inversion for negative rail. Use Value: Enables single-cell battery operation while meeting stringent LCD VGH/VGL requirements without discrete high-voltage generators. |
Use Scenario: Driving four-series white LEDs (≈12 V total VF) from 3.6 V Li-ion in digital still cameras. IC Role / Device Role / Timing Role: Constant-voltage boost converter with external current-sense resistor (RS) converting to constant-current mode via FB pin modulation. Use Value: Achieves >80% efficiency at 20 mA LED current, extending capture count per charge without thermal derating. |
| Handheld Game Power | Portable Instrument Display |
Use Scenario: Providing 12–15 V bias for OLED or high-brightness LCD in battery-operated gaming devices. IC Role / Device Role / Timing Role: Main DC-DC converter enabling dynamic brightness scaling via PWM-controlled FB injection. Use Value: Supports rapid dimming response (<10 µs) and maintains regulation during burst-mode CPU activity due to fast PFM recovery. |
Use Scenario: Powering analog front-end and display subsystems in handheld multimeters and spectrum analyzers. IC Role / Device Role / Timing Role: Isolated high-impedance boost stage feeding precision DACs and op-amps requiring clean, low-noise 15 V rails. Use Value: Low 19 µA quiescent current preserves battery life during measurement standby; CE pin enables MCU-controlled power gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61022DRVR | Higher 5.5 V input limit, 2.0 A switch, fixed 500 kHz PWM - no PFM mode; requires external compensation. | Better suited for high-current, low-ripple applications (e.g., RF modules); less efficient below 5 mA. | Select when >100 mA output or strict EMI control is required; avoid if ultra-low IQ or battery longevity is primary. |
| MAX17222ELT+T | 1.8 V min startup, 300 mA switch, 1.2 MHz PWM/PFM hybrid - smaller 6-bump WLP package. | Optimized for wearables and hearing aids; lacks CE pin; lower max VOUT (5.5 V). | Choose for sub-2 mm² footprint and sub-1 µA shutdown; not viable for 15 V LCD bias or LED strings. |
Compared with NCP1403SNT1G, the TPS61022DRVR delivers higher current but sacrifices light-load efficiency and simplicity, while the MAX17222ELT+T offers miniaturization at the cost of output voltage capability and enable control - making NCP1403SNT1G uniquely balanced for 15 V, low-IQ, CE-gated portable systems.
Availability
NCP1403SNT1G is available at Aetrix Electronics and suitable for LCD bias supplies, white LED drivers, handheld game consoles, and portable instrumentation requiring stable component supply with Pb-free compliance and TSOP-5 footprint compatibility.
Supply support for NCP1403SNT1G 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and portable electronics.
The NCP1403SNT1G belongs to onsemi's low-power DC-DC converter product line, engineered specifically for battery-powered handheld devices where minimal quiescent current, wide input range, and integrated high-voltage switching are essential.
FAQ
What is the minimum input voltage required for NCP1403SNT1G to start switching?
The NCP1403SNT1G has a typical minimum startup voltage of 1.3 V at zero load, with a maximum of 1.8 V across temperature. This allows reliable operation from nearly depleted alkaline cells or low-state-of-charge lithium batteries. Startup behavior is confirmed in Figure 13 and Electrical Characteristics table (Vstart parameter). The NCP1403SNT1G sustains regulation down to 1.2 V hold voltage once running.
Can NCP1403SNT1G generate output voltages higher than 15 V?
No - the NCP1403SNT1G's internal 16 V MOSFET limits safe operation to ≤15 V output. However, the datasheet (Figures 33 and 35) shows two validated extension methods: (1) cascading an external high-voltage N-MOSFET to reach 29 V, and (2) adding a diode-capacitor voltage doubler to achieve 30 V. Both require careful layout and component selection; the NCP1403SNT1G itself remains constrained to 15 V.
How does the CE pin function on NCP1403SNT1G, and what happens when it's left unconnected?
The CE pin is an active-high enable input: ≥0.9 V enables regulation, ≤0.3 V disables the IC (reducing current to 0.3 µA). When left floating, an internal 100 nA pullup current source pulls CE toward VOUT, resulting in automatic enable - a key feature for simplified designs. This behavior is explicitly documented in the Pin Function Descriptions and Applications section of the NCP1403SNT1G datasheet.
What is the recommended inductor value for NCP1403SNT1G in a 15 V/30 mA application?
For 15 V/30 mA output from a 3.6 V input, the datasheet recommends 47 µH (Figure 1, Table "Typical Step-Up Application Circuit 1") with low-DCR construction (<1 Ω) and saturation current >300 mA. A 22 µH inductor may increase switching frequency but reduces output current capability due to minimum off-time limitation - confirmed in the "External Component Selection" section (page 10) of the NCP1403SNT1G datasheet.
Does NCP1403SNT1G support negative voltage generation?
Yes - the NCP1403SNT1G can generate negative outputs using external charge-pump components (diodes and capacitors) connected to the LX pin, as shown in Figure 32. In this configuration, the FB pin still monitors the positive rail, so negative output regulation is approximate. The datasheet specifies −15 V generation capability and notes reduced load regulation versus standard positive configurations - a verified use case for LCD bias in Figure 37.
NCP1403SNT1G 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 50mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP1403SNT1G FAQ
1.How can I place an order for NCP1403SNT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1403SNT1G 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 NCP1403SNT1G reliable?
The price and inventory of NCP1403SNT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1403SNT1G is usually 5 days.
3.What payment methods are accepted for NCP1403SNT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1403SNT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1403SNT1G?
NCP1403SNT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1403SNT1G 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 NCP1403SNT1G?
For technical support, including NCP1403SNT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1403SNT1G requirements.
6.How does Aetrix verify that NCP1403SNT1G is sourced from the original manufacturer or authorized distributors?
All NCP1403SNT1G 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 NCP1403SNT1G meets industry standards.
7.What is the process for return or replacement of NCP1403SNT1G?
All NCP1403SNT1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1403SNT1G, 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 NCP1403SNT1G part is unused and in its original packaging.
Return procedure for NCP1403SNT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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