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onsemi NCP690MN25T2G
- Part No.:
- NCP690MN25T2G
- Manufacturer:
- onsemi
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
NCP690MN25T2G.pdf
- Description:
- IC REG LINEAR 2.5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,760
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Product details
Overview
NCP690MN25T2G from onsemi is a fixed-output 2.5 V, 1 A CMOS low-dropout (LDO) voltage regulator in a 6-lead DFN3x3 package. It delivers ±2% output voltage tolerance over −40°C to 125°C, features 190 mV dropout at 1 A (VOUT = 2.5 V), and supports portable battery-powered systems requiring low quiescent current, high PSRR, and ceramic-capacitor compatibility.
For engineers reviewing the NCP690MN25T2G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1 A output under 1.5–6.0 V input, active output discharge, thermal shutdown at 175°C, and compatibility with space-constrained PCB layouts using low-ESR ceramic capacitors.
Technical Context
The NCP690MN25T2G implements a PMOS pass transistor architecture enabling very low dropout and stable operation with 1 µF minimum output capacitance. Its internal bandgap reference and error amplifier maintain regulation across load (100 µA–1 A) and line (1.5–6.0 V) variations without external compensation.
It integrates thermal shutdown (175°C trip, 10°C hysteresis), short-circuit current limiting (1.2 A typical), and active output discharge for controlled power-down. The device lacks an enable pin - pins 3 and 5 are designated N/C and SNS respectively per fixed-version pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% over −40°C to 125°C - ensures stable core logic supply for FPGAs and microprocessors. |
| Max Output Current | 1 A continuous - supports single-rail powering of DSPs, PCI cards, or HDD preamp circuits. |
| Dropout Voltage | 190 mV at 1 A (TJ = 25°C) - enables operation from 2.69 V input, critical for Li-ion battery discharge tail-end. |
| Ground Current | 145 µA at 1 A load - minimizes standby power loss in always-on portable subsystems. |
| PSRR | 62 dB at 120 Hz - suppresses ripple from noisy DC-DC converters feeding intermediate rails. |
| Noise Voltage | 50 µVRMS (200 Hz–100 kHz) - suitable for noise-sensitive analog/RF circuitry without bypass capacitor. |
| Thermal Shutdown | 175°C with 10°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
Package: DFN6 3×3 mm, 0.95 mm pitch, exposed thermal pad (Case 506AH). Pin 1 marked by dot; pins 1 and 6 are paralleled IN inputs for full current capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6 | IN | Primary input voltage supply - must be connected together to deliver full 1 A output current and minimize IR drop. |
| 2 | GND | Power ground tied to die via lead frame - soldered to ≥64 mm² copper plane for thermal management (RJA = 70°C/W). |
| 3 | N/C | No connect - left floating; not used in NCP690 fixed version (EN function reserved for NCP691/NCP692). |
| 4 | OUT | Regulated 2.5 V output - requires ≥1 µF ceramic capacitor placed adjacent to pin for stability and transient response. |
| 5 | SNS | Sense input - must be shorted directly to OUT pin to enable precision regulation and load-transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Very Low Dropout | 190 mV @ 1 A enables >95% efficiency at 2.5 V output from 2.7 V Li-ion sources. |
| Active Output Discharge | Internal MOSFET rapidly discharges OUT when input removed - prevents floating rail during hot-swap or brown-out. |
| Enhanced ESD Protection | 4 kV HBM / 200 V MM rating - eliminates need for external TVS in handheld and telecom board designs. |
| Ceramic-Capacitor Stable | Stable with 1 µF min COUT, no ESR requirement - reduces BOM cost and footprint vs. tantalum-based LDOs. |
| Low Noise Operation | 50 µVRMS noise without bypass cap - avoids startup delay and simplifies layout for ADC reference or RF bias rails. |
Applications
| Laptop Core Logic Supply | DSP Power Rail |
|---|---|
|
Use Scenario: Powers 2.5 V I/O banks of Intel/AMD mobile processors in ultrabooks with dynamic load steps up to 1 A. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 2.5 V from 3.3 V intermediate bus. Use Value: 190 mV dropout extends battery runtime; 50 µVRMS noise prevents digital jitter in high-speed serial links. |
Use Scenario: Supplies 2.5 V analog front-end and core voltage for TI C6000 DSPs in telecom baseband boards. IC Role / Device Role / Timing Role: Local LDO providing isolated, low-ripple power to sensitive signal processing circuitry. Use Value: 62 dB PSRR at 120 Hz rejects switching noise from upstream DC-DC; thermal shutdown prevents damage during burst-mode processing. |
| PCI Card Auxiliary Rail | Hard Disk Drive Preamp |
|
Use Scenario: Generates 2.5 V auxiliary rail for PCIe add-in cards operating in industrial temperature range (−40°C to 125°C). IC Role / Device Role / Timing Role: Fixed-output LDO replacing discrete regulators in space-constrained card-edge connectors. Use Value: ±2% tolerance ensures compliance with PCIe specification margin; DFN3x3 footprint saves >40% area vs. SOIC-8 alternatives. |
Use Scenario: Powers read/write channel preamplifier ICs in 2.5-inch HDDs where thermal density and EMI are critical. IC Role / Device Role / Timing Role: Low-noise, thermally robust local regulator decoupling motor driver noise. Use Value: Active output discharge prevents data corruption during sudden power loss; 175°C thermal cutoff avoids preamp latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP691MN25T2G | Includes active-low EN pin; identical 2.5 V output, dropout, and noise specs. | Required where system-level power sequencing or standby control is needed. | Select when enable functionality is mandatory; otherwise NCP690MN25T2G offers lower pin count and simpler layout. |
| NCP692MN25T2G | Includes active-high EN pin; same electrical performance and package as NCP690MN25T2G. | Suitable for MCU-driven enable schemes with push-pull GPIO outputs. | Choose only if host controller requires active-high signaling; NCP690MN25T2G eliminates enable logic overhead. |
Compared with NCP691MN25T2G and NCP692MN25T2G, the NCP690MN25T2G provides identical regulation accuracy, thermal protection, and noise performance while reducing design complexity by omitting enable circuitry - ideal for fixed-on applications like embedded storage or passive peripheral rails.
Availability
NCP690MN25T2G is available at Aetrix Electronics and suitable for laptop power delivery, telecom board auxiliary rails, and hard disk drive preamp circuits requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP690MN25T2G 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP690 series belongs to onsemi's high-performance LDO family designed specifically for space-constrained, battery-powered applications demanding ultra-low dropout, low noise, and ceramic-capacitor stability - targeting portable computing, telecom, and storage systems.
FAQ
What is the maximum input voltage for the NCP690MN25T2G?
The absolute maximum input voltage for the NCP690MN25T2G is 6.5 V. However, the recommended operating input range is 1.5 V to 6.0 V. Operation above 6.0 V risks exceeding safe junction temperature or violating absolute ratings, especially under high load. For reliable 2.5 V output, minimum input is 2.69 V (2.5 V + 190 mV dropout).
Does the NCP690MN25T2G require an enable pin to operate?
No, the NCP690MN25T2G does not require an enable pin. Pin 3 is designated N/C (no connect) in the fixed-output version. The regulator powers up automatically when valid input voltage is applied to pins 1 and 6. This differs from the NCP691MN25T2G (active-low EN) and NCP692MN25T2G (active-high EN), which use pin 3 for control.
Can the NCP690MN25T2G be used with a 1 µF ceramic output capacitor?
Yes, the NCP690MN25T2G is stable with a minimum 1 µF ceramic output capacitor and has no ESR requirement. A 10 µF ceramic capacitor is recommended to improve load transient response and noise rejection. The device's internal compensation eliminates need for external RC networks or tantalum capacitors.
What is the thermal resistance (RJA) of the NCP690MN25T2G in standard PCB layout?
For the NCP690MN25T2G in its DFN6 3×3 mm package, RJA is 169°C/W with 1 oz Cu on FR4 (64 mm² copper area), and improves to 70°C/W with 645 mm² copper area. The exposed thermal pad (pin 2) must be soldered to a solid copper plane to achieve rated thermal performance and sustain 1 A continuous output.
How does the SNS pin function in the NCP690MN25T2G?
In the NCP690MN25T2G, the SNS (sense) pin (pin 5) must be connected directly to the OUT pin. This Kelvin sensing configuration compensates for PCB trace resistance between the regulator and load, maintaining ±2% output accuracy under varying load currents and board layouts - critical for high-precision 2.5 V applications.
NCP690MN25T2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- 240 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (3x3)
NCP690MN25T2G FAQ
1.How can I place an order for NCP690MN25T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP690MN25T2G 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 NCP690MN25T2G reliable?
The price and inventory of NCP690MN25T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP690MN25T2G is usually 5 days.
3.What payment methods are accepted for NCP690MN25T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP690MN25T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP690MN25T2G?
NCP690MN25T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP690MN25T2G 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 NCP690MN25T2G?
For technical support, including NCP690MN25T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP690MN25T2G requirements.
6.How does Aetrix verify that NCP690MN25T2G is sourced from the original manufacturer or authorized distributors?
All NCP690MN25T2G 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 NCP690MN25T2G meets industry standards.
7.What is the process for return or replacement of NCP690MN25T2G?
All NCP690MN25T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP690MN25T2G, 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 NCP690MN25T2G part is unused and in its original packaging.
Return procedure for NCP690MN25T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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