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onsemi NCP1529MUTBG
- Part No.:
- NCP1529MUTBG
- Manufacturer:
- onsemi
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
NCP1529MUTBG.pdf
- Description:
- IC REG BUCK ADJ 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,430
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Product details
Overview
NCP1529MUTBG from onsemi is a monolithic synchronous buck DC-DC converter optimized for portable battery-powered systems, delivering up to 1.0 A at an externally adjustable output voltage from 0.9 V to 3.9 V (or fixed 1.2 V/1.35 V), operating from 2.7 V–5.5 V input, with 1.7 MHz switching frequency and 96% peak efficiency in PWM mode.
For engineers reviewing the NCP1529MUTBG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options for Li-ion–powered consumer electronics design.
Technical Context
The NCP1529MUTBG implements constant-frequency current-mode control with automatic PWM/PFM mode transition to maintain high efficiency across load ranges. Its internal 1.7 MHz oscillator enables compact 2.2 µH inductor and 10 µF ceramic output capacitor designs.
It integrates synchronous rectification using internal P-channel high-side and N-channel low-side MOSFETs (RONHS = 400 mΩ, RONLS = 300 mΩ), cycle-by-cycle current limiting (1.6 A peak), thermal shutdown (180°C), and soft-start (310–500 µs) - all within a 2×2×0.5 mm UDFN6 package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion (3.0–4.2 V) and USB 5 V rail operation without external LDO pre-regulation. |
| Output Current | 1.0 A continuous - sufficient for core logic rails in smartphones, cameras, and modems under full load. |
| Switching Frequency | 1.7 MHz (nominal) - enables use of sub-3 mm footprint inductors and reduces EMI fundamental below 2 MHz. |
| Feedback Reference | 0.6 V - sets output via resistor divider; allows precise 0.9–3.9 V adjustment with <±3% accuracy over temperature. |
| Quiescent Current | 28 µA - maintains ultra-low standby power in always-on subsystems like PMIC backup rails. |
| Shutdown Current | 0.3 µA - ensures negligible battery drain during system sleep or off-state. |
| Thermal Shutdown | 180°C with 40°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: UDFN6 (2×2×0.5 mm, case 517AB), Pb-free, with exposed thermal pad (Pin 7) requiring connection to system ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Analog Input | Feedback node for output voltage regulation; connects to resistor divider midpoint; sensitive to noise - must be routed away from SW and GND loops. |
| 2 & 4 & 7 (GND) | Power/Analog Ground | Common reference for power stage and analog circuitry; Pin 7 is exposed thermal pad - must be soldered to large copper pour for thermal dissipation. |
| 3 (VIN) | Power Input | Main supply input (2.7–5.5 V); requires local 4.7 µF ceramic decoupling placed adjacent to pin. |
| 5 (EN) | Digital Input | Active-high enable; logic threshold 1.2 V (min), 0.4 V (max); hysteresis 100 mV prevents chatter near trip point. |
| 6 (SW) | Analog Output | Switch node connecting internal FETs to external inductor; high dv/dt node - minimize trace length and avoid routing near sensitive signals. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency to 96%. |
| Automatic PWM/PFM mode switching | Maintains >85% efficiency down to 1 mA load, extending battery life in idle or low-power states. |
| Integrated soft-start | 310–500 µs ramp time limits inrush current into output capacitors, preventing input rail droop or reset glitches. |
| Full ESD protection | All pins rated to 2 kV HBM - eliminates need for external TVS in handheld device front-end design. |
| Low-noise PFM ripple | ≤8 mVPP output ripple at no load and ≤3 mVPP at 300 mA - meets stringent noise requirements for RF and audio subsystems. |
Applications
| Smartphone Core Rail | Digital Camera Sensor Supply |
|---|---|
Use Scenario: Powering application processor I/O or memory interface rails in space-constrained smartphone mainboard. IC Role / Device Role / Timing Role: Primary step-down regulator converting single-cell Li-ion (3.6 V avg) to 1.2 V or 1.35 V logic rail with tight transient response. Use Value: 1.7 MHz switching enables 2.2 µH inductor footprint <3 mm²; 96% efficiency minimizes thermal impact on adjacent RF modules. |
Use Scenario: Supplying image sensor analog and digital cores in compact digital still cameras with variable frame-rate loads. IC Role / Device Role / Timing Role: Adjustable-output buck converter delivering stable 0.9–3.3 V from 3.3 V or 5 V input, supporting multiple sensor configurations. Use Value: PFM mode extends battery runtime during preview; low 8 mVPP ripple prevents image noise in analog signal chain. |
| USB-Powered Audio DAC | DSL Modem PHY Interface |
Use Scenario: Regulating clean 3.3 V supply for high-resolution audio DAC in USB bus-powered portable players. IC Role / Device Role / Timing Role: Fixed 3.3 V output variant (via FB divider) sourcing 600 mA from 5 V USB input with minimal external components. Use Value: High PSRR and low 3 mVPP ripple at 300 mA ensure THD+N <−105 dB; 1.7 MHz avoids audible switching artifacts. |
Use Scenario: Generating 1.2 V or 1.8 V supply for DSL line driver PHY in residential broadband modems with thermal constraints. IC Role / Device Role / Timing Role: Efficient 1 A buck converter operating from 3.3 V or 5 V rail, with thermal shutdown protecting against ambient +70°C enclosure conditions. Use Value: UDFN6 package with exposed pad achieves 40°C/W RJA; 180°C thermal cutoff prevents latch-up during sustained line surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.8–6.0 V input; 1.0 A; 3.6 MHz switching; 0.6 V reference; different pinout (5-pin WSON). | Higher frequency enables smaller passives but increases EMI filtering complexity; lacks PFM mode at light load. | Select when board layout prioritizes smallest inductor size and system clocking tolerates higher-frequency noise. |
| MP2143GJ-Z | 2.5–6.0 V input; 1.2 A; 1.5 MHz; 0.8 V reference; integrated compensation; different package (8-pin QFN). | Higher current rating and lower reference allow tighter regulation at 0.8 V, but requires larger PCB area and lacks UDFN6 thermal performance. | Select when 1.2 A headroom or 0.8 V output is required, and thermal pad layout can accommodate 3×3 mm QFN. |
Compared with TPS62231DRYR and MP2143GJ-Z, the NCP1529MUTBG offers superior thermal resistance (40°C/W) in a 2×2 mm footprint, best-in-class PFM ripple (<8 mVPP), and proven reliability in high-volume portable designs - making it optimal for thermally dense, battery-sensitive applications where layout area and quiescent current are critical.
Availability
NCP1529MUTBG is available at Aetrix Electronics and suitable for smartphone core rails, digital camera sensor supplies, USB-powered audio DACs, DSL modem PHY interfaces, and portable equipment requiring stable component supply with long lifecycle support.
Supply support for NCP1529MUTBG 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, and sensor solutions for automotive, industrial, and portable electronics.
The NCP1529MUTBG belongs to onsemi's high-efficiency DC-DC converter product line, designed specifically for space- and battery-constrained portable devices requiring low quiescent current, small solution size, and robust thermal performance.
FAQ
What is the recommended inductor value for NCP1529MUTBG?
The NCP1529MUTBG is optimized for a 2.2 µH inductor with ≤0.3 Ω DCR, such as Coilcraft DO1605T-222 or Murata LQM2HPN2R2. This value ensures stable loop response, <34 kHz corner frequency, and minimal ripple current while maintaining 96% peak efficiency. Larger inductors reduce ripple but degrade transient response and may require re-evaluation of internal compensation stability.
Does NCP1529MUTBG support fixed output voltages?
Yes, the NCP1529MUTBG is the adjustable version, but the same family includes fixed-output variants: NCP1529MU12TBG (1.2 V) and NCP1529MU135TBG (1.35 V). The NCP1529MUTBG itself requires an external resistor divider (R1/R2) between VOUT and FB to set output from 0.9 V to 3.9 V, with feedback reference voltage fixed at 0.6 V.
How does the thermal pad (Pin 7) on NCP1529MUTBG affect performance?
The exposed thermal pad (Pin 7) on the NCP1529MUTBG must be soldered to a dedicated GND plane with ≥4 thermal vias to achieve the specified 40°C/W junction-to-ambient thermal resistance. Omitting this connection raises junction temperature by >50°C at 1 A load, triggering thermal shutdown prematurely and degrading long-term reliability.
What is the minimum input voltage required for NCP1529MUTBG to start regulation?
The NCP1529MUTBG features undervoltage lockout (UVLO) with a typical turn-on threshold of 2.4 V and 100 mV hysteresis. Regulation begins only after VIN rises above 2.4 V; if VIN falls below 2.3 V, the device shuts down. This prevents unstable operation during Li-ion battery discharge below 2.7 V nominal.
Can NCP1529MUTBG operate in 100% duty cycle for low-dropout applications?
Yes, the NCP1529MUTBG supports 100% duty cycle operation, enabling dropout as low as VOUT + IOUT × RDS(on). In this mode, the internal P-channel MOSFET remains fully enhanced, allowing regulation even when VIN approaches VOUT. This is critical for maintaining 1.2 V output as a Li-ion cell discharges from 3.4 V to 3.0 V.
NCP1529MUTBG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 3.9V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UDFN (2x2)
NCP1529MUTBG FAQ
1.How can I place an order for NCP1529MUTBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1529MUTBG 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 NCP1529MUTBG reliable?
The price and inventory of NCP1529MUTBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1529MUTBG is usually 5 days.
3.What payment methods are accepted for NCP1529MUTBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1529MUTBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1529MUTBG?
NCP1529MUTBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1529MUTBG 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 NCP1529MUTBG?
For technical support, including NCP1529MUTBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1529MUTBG requirements.
6.How does Aetrix verify that NCP1529MUTBG is sourced from the original manufacturer or authorized distributors?
All NCP1529MUTBG 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 NCP1529MUTBG meets industry standards.
7.What is the process for return or replacement of NCP1529MUTBG?
All NCP1529MUTBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1529MUTBG, 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 NCP1529MUTBG part is unused and in its original packaging.
Return procedure for NCP1529MUTBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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