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onsemi NCP1529MU135TBG
- Part No.:
- NCP1529MU135TBG
- Manufacturer:
- onsemi
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
NCP1529MU135TBG.pdf
- Description:
- IC REG BUCK SYNC 1.35V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
NCP1529MU135TBG from onsemi is a fixed-output synchronous buck DC-DC converter delivering 1.35 V at up to 1.0 A from 2.7–5.5 V input, featuring 1.7 MHz switching, 96% peak efficiency, and integrated soft-start and thermal shutdown. It targets space-constrained portable power rails in USB-powered devices and battery-operated systems requiring low-noise, high-efficiency regulation.
For engineers reviewing the NCP1529MU135TBG 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 fixed 1.35 V step-down conversion.
Technical Context
The NCP1529MU135TBG implements constant-frequency current-mode control with automatic PWM/PFM mode transition to optimize light-load efficiency. Its internal 0.6 V reference and fixed 1.35 V output are achieved via factory-trimmed feedback network - no external resistors required.
It integrates synchronous P-channel and N-channel MOSFETs (400 mΩ and 300 mΩ RDS(on), respectively), operates down to 2.7 V input, and includes cycle-by-cycle current limiting (1.6 A peak), undervoltage lockout (2.4 V typ), and thermal shutdown (180°C trip, 40°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.35 V ±2% over −40°C to +85°C; no external resistor divider needed. |
| Max Output Current | 1.0 A continuous; derates above 45°C ambient per published power derating curves. |
| Switching Frequency | 1.7 MHz nominal (1.2–2.2 MHz range); enables use of 2.2 µH inductor and compact 10 µF ceramic output capacitor. |
| Input Voltage Range | 2.7 V to 5.5 V; supports single-cell Li-ion, triple-cell alkaline/NiMH, and USB 5 V rail inputs. |
| Quiescent Current | 28 µA in active PFM mode; 0.3 µA in shutdown - critical for battery runtime extension. |
| Efficiency | Up to 96% at 3.6 VIN/1.35 VOUT/500 mA; maintains >85% down to 10 mA load in PFM mode. |
| Package | UDFN6 (2 mm × 2 mm × 0.5 mm); exposed thermal pad (Pin 7) must be soldered to PCB ground plane. |
Pinout & Package
UDFN6 package (Case 517AB) with 0.65 mm pitch and thermally enhanced exposed pad (Pin 7). Requires solder connection of exposed pad to system ground for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Internal connection to 0.6 V reference; unused in fixed 1.35 V version but must remain unconnected (NC). |
| 2,4,7 (GND) | Power & Analog Ground | Pins 2 and 4 are signal GND; Pin 7 is exposed thermal pad - all must connect to low-impedance system ground plane. |
| 3 (VIN) | Power Input | Primary input supply (2.7–5.5 V); requires local 4.7 µF ceramic decoupling placed within 2 mm. |
| 5 (EN) | Enable Control | Active-high logic input; ≥1.2 V enables regulation, ≤0.4 V forces shutdown (0.3 µA ISTB). |
| 6 (SW) | Switch Node | Drives external inductor; carries high di/dt; must be routed short and away from sensitive analog traces. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-ch and N-ch MOSFETs eliminate external Schottky diode, reducing conduction loss and board area. |
| Automatic PWM/PFM mode | Seamless transition below ~50 mA load; maintains >85% efficiency at 10 mA while cutting quiescent current to 28 µA. |
| Low-noise 1.35 V output | 8 mVPP ripple at no load; 3 mVPP at 300 mA - meets noise-sensitive RF and audio subsystem requirements. |
| Robust protection suite | Includes cycle-by-cycle current limit (1.6 A), thermal shutdown (180°C), UVLO (2.4 V), and full-pin ESD protection (2 kV HBM). |
| Space-optimized UDFN6 | 2 mm × 2 mm footprint with 0.5 mm height; thermal resistance RJA = 40°C/W with recommended PCB layout. |
Applications
| USB-Powered IoT Sensors | Wearable Health Monitors |
|---|---|
|
Use Scenario: Compact BLE sensor node powered directly from USB 5 V, requiring clean 1.35 V for ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Primary voltage regulator converting USB 5 V to stable 1.35 V with minimal board area and thermal rise. Use Value: 96% efficiency at 200 mA extends battery life; 3 mVPP ripple prevents ADC quantization noise; UDFN6 fits <8 mm² PCB area. |
Use Scenario: Optical heart-rate monitor using photodiode array and low-noise amplifier, powered by coin cell with USB recharge path. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying regulated 1.35 V to analog signal chain during both battery and USB operation. Use Value: PFM mode draws only 28 µA at standby, preserving coin cell life; thermal shutdown prevents skin-contact overheating risk. |
| Industrial Handheld Scanners | Smart Card Readers |
|
Use Scenario: Ruggedized barcode scanner with laser driver and CMOS imager, operating from 3.6 V Li-ion and requiring precise 1.35 V for image sensor bias. IC Role / Device Role / Timing Role: High-current (1 A) point-of-load regulator with fast transient response to handle pulsed laser current demands. Use Value: 85 mV load transient deviation (200→600 mA step) ensures stable sensor bias; 1.7 MHz switching avoids interference with 2.4 GHz RF bands. |
Use Scenario: Contactless smart card reader powered via USB or 3.3 V system rail, needing tightly regulated 1.35 V for secure element and NFC transceiver. IC Role / Device Role / Timing Role: Immune-to-noise power source for cryptographic ICs where supply ripple could induce side-channel leakage. Use Value: 0.6 V internal reference and factory-trimmed FB network deliver ±2% output accuracy without calibration; ESD-hardened pins survive hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | Fixed 1.3 V output (not 1.35 V); 2.05 MHz switching; 0.95 A max; WSON-6 package (2 mm × 2 mm). | Requires design tolerance adjustment for 1.3 V vs. 1.35 V; higher frequency allows smaller inductors but increases EMI filtering complexity. | Select if 1.3 V is acceptable and board layout prioritizes smallest possible inductor size. |
| RT7297CGJ6F | Adjustable output (0.6–5.5 V); 1.5 A max; 1.5 MHz; QFN-6 (3 mm × 3 mm); no fixed 1.35 V option. | Requires external resistor divider and feed-forward capacitor; larger footprint; higher current capability not needed for 1.35 V/1 A use case. | Select only if future voltage flexibility is required; adds BOM cost and layout overhead versus drop-in fixed solution. |
Compared with TPS62231DRVR and RT7297CGJ6F, the NCP1529MU135TBG delivers exact 1.35 V without external components, occupies identical 2 mm × 2 mm area, and achieves superior light-load efficiency via optimized PFM architecture - making it the most direct fit for cost- and space-sensitive 1.35 V rails.
Availability
NCP1529MU135TBG is available at Aetrix Electronics and suitable for USB-powered IoT sensors, wearable health monitors, industrial handheld scanners, and smart card readers requiring stable component supply with guaranteed long-term sourcing.
Supply support for NCP1529MU135TBG 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 focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.
The NCP1529MU135TBG belongs to onsemi's NCP15xx family of high-frequency synchronous buck converters, designed specifically for portable and battery-powered applications demanding small size, high efficiency, and robust protection.
FAQ
What is the output voltage tolerance of the NCP1529MU135TBG across temperature and load?
The NCP1529MU135TBG delivers 1.35 V with ±2% accuracy over −40°C to +85°C ambient temperature and full 0–1.0 A load range. This specification includes initial trim error, line regulation (0.05% typical), and load regulation (±1.1% max), confirmed in Electrical Characteristics Table on page 5 of the datasheet.
Does the NCP1529MU135TBG require external feedback resistors?
No. The NCP1529MU135TBG is a factory-configured fixed-output variant; its 1.35 V output is set internally using trimmed resistors. The FB pin is not connected internally and must be left floating - no external resistors or capacitors are needed for regulation.
What is the recommended inductor value for the NCP1529MU135TBG?
onsemi specifies 2.2 µH as the optimal inductor value for the NCP1529MU135TBG, matched to its 1.7 MHz switching frequency and internal compensation. Recommended parts include Murata LQM2HPN2R2 (2.5 mm × 2.0 mm) or Coilcraft DO1605T-222 (5.5 mm × 4.2 mm), both rated for ≥1.3 A saturation current.
How does the NCP1529MU135TBG behave during thermal overload?
When junction temperature exceeds 180°C, the NCP1529MU135TBG activates thermal shutdown: all power switches and control circuitry disable, output drops to 0 V, and quiescent current falls to 0.3 µA. Recovery occurs automatically once die temperature cools below 140°C, followed by full soft-start sequence.
Can the NCP1529MU135TBG operate from a 5.0 V USB input to deliver 1.35 V at 1.0 A?
Yes. The NCP1529MU135TBG supports 5.0 V input and delivers 1.35 V at 1.0 A in PWM mode with 88–92% efficiency (per Figure 28). It maintains <±1.5% load regulation and <3 mVPP ripple under these conditions, meeting USB-powered device requirements.
NCP1529MU135TBG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UDFN (2x2)
NCP1529MU135TBG FAQ
1.How can I place an order for NCP1529MU135TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1529MU135TBG 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 NCP1529MU135TBG reliable?
The price and inventory of NCP1529MU135TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1529MU135TBG is usually 5 days.
3.What payment methods are accepted for NCP1529MU135TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1529MU135TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1529MU135TBG?
NCP1529MU135TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1529MU135TBG 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 NCP1529MU135TBG?
For technical support, including NCP1529MU135TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1529MU135TBG requirements.
6.How does Aetrix verify that NCP1529MU135TBG is sourced from the original manufacturer or authorized distributors?
All NCP1529MU135TBG 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 NCP1529MU135TBG meets industry standards.
7.What is the process for return or replacement of NCP1529MU135TBG?
All NCP1529MU135TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1529MU135TBG, 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 NCP1529MU135TBG part is unused and in its original packaging.
Return procedure for NCP1529MU135TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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