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onsemi NCP1421DMR2
- Part No.:
- NCP1421DMR2
- Manufacturer:
- onsemi
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
NCP1421DMR2.pdf
- Description:
- IC REG BOOST ADJ 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,243
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Product details
Overview
NCP1421DMR2 from onsemi is a monolithic micropower synchronous boost DC-DC converter IC designed for battery-powered handheld electronics, delivering up to 600 mA output current at 3.3 V from a 2.5 V input, featuring true-cutoff shutdown (50 nA), integrated ring-killer, and PFM control with 1.2 MHz switching frequency.
For engineers reviewing the NCP1421DMR2 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed efficiency curves (94% @ 200 mA), exact Micro8 package mapping, and two rigorously cross-checked alternative parts for low-power boost conversion in portable instrumentation and camera flash systems.
Technical Context
The NCP1421DMR2 implements a PFM-based control scheme with cycle-by-cycle current limiting (1.5 A) and fixed 1.20 V reference (±1.5% accuracy), enabling precise output voltage regulation via external resistor divider. Its synchronous rectification replaces the Schottky diode using integrated N- and P-channel MOSFETs (RDS(ON) = 0.3 Ω each), eliminating conduction loss while requiring dead-time management to prevent shoot-through.
True-cutoff functionality fully isolates BAT and OUT during shutdown by disabling internal conduction paths, reducing leakage to 50 nA. The integrated ring-killer comparator (ZLC) detects zero-current crossing in discontinuous conduction mode to suppress high-frequency ringing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600 mA max at VIN = 2.5 V, VOUT = 3.3 V - supports high-brightness white LED flash and PDA power rails |
| Switching Frequency | Up to 1.2 MHz - enables use of compact 5.6 µH inductors and low-profile 22 µF ceramic output capacitors |
| Reference Voltage | 1.20 V ±1.5% - sets output voltage via FB divider; supplies 2.5 mA load at VOUT ≥ 3.3 V |
| Quiescent Current | 8.5 µA typical - sustains ultra-low power operation in always-on battery monitoring circuits |
| Shutdown Current | 50 nA typical - preserves battery life during extended standby in handheld instruments |
| Current Limit | 1.5 A cycle-by-cycle - protects internal FETs and external inductor under short-circuit or overload |
| Input Voltage Range | 1.0 V to 5.0 V - supports single-cell alkaline/NiMH (1.0–1.8 V) and Li-ion (3.0–4.2 V) sources |
Pinout & Package
The NCP1421DMR2 is housed in the Micro8 plastic package (Case 846A), an 8-pin surface-mount device with exposed thermal pad, Pb-free compliant, rated for −40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Compares divided output voltage to 1.20 V reference; sets regulated VOUT via R1/R2 divider |
| LBI/EN (Pin 2) | Low-battery detect input / enable | Pulls <0.3 V to disable IC; threshold at 1.20 V for LBI detection; enables true-cutoff when grounded |
| LBO (Pin 3) | Open-drain low-battery output | Sinks current when VLBI < 1.20 V; high-impedance in shutdown - drives external LED or MCU interrupt |
| REF (Pin 4) | 1.20 V reference output | Bypassed with 200 nF (unloaded) or 1.0 µF (loaded); supplies 2.5 mA for auxiliary biasing |
| BAT (Pin 5) | Battery input for ring-killer | Connects to battery anode to provide voltage reference for anti-ringing comparator (ZLC) |
| GND (Pin 6) | Power ground | Common return for LX, OUT, and internal logic; requires star-ground layout to minimize noise coupling |
| LX (Pin 7) | Switch node | Drain connection of internal N- and P-channel MOSFETs; drives external inductor; high dv/dt node |
| OUT (Pin 8) | Regulated power output | Delivers boosted voltage; also supplies bootstrap power to internal gate drivers during operation |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode; uses integrated N/P-FETs (RDS(ON) = 0.3 Ω) to achieve 94% efficiency at 200 mA |
| True-cutoff shutdown | Blocks all internal conduction paths between BAT, LX, and OUT; reduces shutdown current to 50 nA |
| Integrated ring-killer | Detects zero-current crossing in DCM via ZLC comparator to suppress high-frequency ringing without snubbers |
| Multi-function EN/LBI pin | Combines logic-controlled shutdown (VEN < 0.3 V) and programmable low-battery detection (VLBI = 1.20 V threshold) |
| Thermal shutdown with hysteresis | Triggers at 145°C with 30°C hysteresis to prevent oscillation during overtemperature events |
Applications
| Personal Digital Assistants (PDA) | Handheld Digital Audio Players |
|---|---|
Use Scenario: Powering 3.3 V logic and display backlights from dual alkaline cells (2.0–3.2 V). IC Role / Device Role / Timing Role: Primary step-up regulator with true-cutoff to extend battery life during sleep mode. Use Value: 8.5 µA quiescent current and 50 nA shutdown current maximize runtime between battery replacements. |
Use Scenario: Generating stable 5.0 V rail for audio DAC and headphone amplifier from single Li-ion cell. IC Role / Device Role / Timing Role: Synchronous boost converter with PFM control to maintain efficiency across variable audio load currents. Use Value: 94% peak efficiency at 200 mA and 1.2 MHz switching allow use of miniature inductors (<3 mm height). |
| Digital Still Cameras (White LED Flash) | Hand-held Test Instruments |
Use Scenario: Delivering 500 mA pulsed current to white LED flash array from 2.5 V nominal input. IC Role / Device Role / Timing Role: High-current boost controller with cycle-by-cycle current limit (1.5 A) for safe LED drive. Use Value: Integrated 1.5 A current limit prevents inductor saturation and FET failure during flash bursts. |
Use Scenario: Providing isolated 3.3 V supply for microcontroller and sensor interface in battery-operated multimeters. IC Role / Device Role / Timing Role: Low-noise, low-quiescent boost regulator with open-drain LBO for battery health monitoring. Use Value: Programmable low-battery detection (via R3/R4 divider) enables accurate end-of-life warning before measurement drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61099YFFR | Higher quiescent current (600 nA vs. 8.5 µA), no true-cutoff (1 µA shutdown), but integrates soft-start and higher 1.5 A current limit | Preferred for space-constrained designs needing integrated soft-start; unsuitable where sub-100 nA shutdown is mandatory | Select TPS61099YFFR only if soft-start timing control outweighs ultra-low shutdown current requirements |
| MAX17222ETA+ | Lower max output current (400 mA vs. 600 mA), 1.3 MHz switching, no integrated ring-killer or LBO pin | Better for cost-sensitive consumer audio; lacks battery monitoring capability required in instrumentation | Choose MAX17222ETA+ for simpler, lower-cost boost needs where LBO and anti-ringing are non-critical |
Compared with NCP1421DMR2, TPS61099YFFR offers superior integration but sacrifices 20× higher shutdown current, while MAX17222ETA+ trades output capability and system-level protection features for lower BOM count in less demanding applications.
Availability
NCP1421DMR2 is available at Aetrix Electronics and suitable for handheld digital audio players, digital still cameras with flash, personal digital assistants, and battery-powered test instruments requiring stable component supply despite its discontinued status.
Supply support for NCP1421DMR2 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and portable electronics.
The NCP1421DMR2 belongs to onsemi's micropower DC-DC converter product line, engineered specifically for ultra-low-power, high-efficiency boost conversion in space- and battery-limited handheld devices.
FAQ
What is the maximum output current capability of the NCP1421DMR2?
The NCP1421DMR2 delivers up to 600 mA output current when configured for 3.3 V output from a 2.5 V input, as confirmed in the Electrical Characteristics table (ILOAD = 600 mA, VIN = 2.5 V, VOUT = 3.3 V). This rating assumes proper thermal management and use of recommended 5.6 µH inductor and 22 µF output capacitor per the datasheet.
Does the NCP1421DMR2 support true-cutoff shutdown, and what is its shutdown current?
Yes, the NCP1421DMR2 implements true-cutoff shutdown via its LBI/EN pin: pulling Pin 2 below 0.3 V disables all internal conduction paths between BAT, LX, and OUT, reducing shutdown current to 50 nA typical - a value explicitly specified in the Electrical Characteristics table under "IBAT True-Cutoff Current into BAT".
What package type and pin count does the NCP1421DMR2 use?
The NCP1421DMR2 is packaged in the Micro8 surface-mount package (Case 846A), an 8-pin device with exposed thermal pad. This is confirmed in the Ordering Information table and Mechanical Case Outline diagram, where "DM" suffix denotes Micro8 and "NCP1421DMR2" maps directly to the 8-pin pinout shown in Figure 1.
Can the NCP1421DMR2 generate output voltages other than 3.3 V?
Yes, the NCP1421DMR2 supports adjustable output voltages from 1.5 V to 5.0 V using an external resistor divider on the FB pin. The output is set by VOUT = 1.20 V × (1 + R1/R2), where the 1.20 V reference is internally trimmed to ±1.5% accuracy - a specification verified in the Electrical Characteristics table under "VREF_NL".
What is the function of the LBO pin on the NCP1421DMR2?
The LBO (Pin 3) is an open-drain low-battery detector output that pulls low when the voltage at LBI/EN (Pin 2) falls below 1.20 V. As stated in the Pin Function Descriptions, LBO is high-impedance during shutdown and can drive external LEDs or microcontroller interrupts - a feature validated in both the Functional Block Diagram and Typical Applications list.
NCP1421DMR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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):
- 1V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
NCP1421DMR2 FAQ
1.How can I place an order for NCP1421DMR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1421DMR2 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 NCP1421DMR2 reliable?
The price and inventory of NCP1421DMR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1421DMR2 is usually 5 days.
3.What payment methods are accepted for NCP1421DMR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1421DMR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1421DMR2?
NCP1421DMR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1421DMR2 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 NCP1421DMR2?
For technical support, including NCP1421DMR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1421DMR2 requirements.
6.How does Aetrix verify that NCP1421DMR2 is sourced from the original manufacturer or authorized distributors?
All NCP1421DMR2 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 NCP1421DMR2 meets industry standards.
7.What is the process for return or replacement of NCP1421DMR2?
All NCP1421DMR2 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1421DMR2, 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 NCP1421DMR2 part is unused and in its original packaging.
Return procedure for NCP1421DMR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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