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onsemi NCP1529MU12TBG
- Part No.:
- NCP1529MU12TBG
- Manufacturer:
- onsemi
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
NCP1529MU12TBG.pdf
- Description:
- IC REG BUCK 1.2V 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,456
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Product details
Overview
NCP1529MU12TBG from onsemi is a monolithic synchronous buck DC-DC converter optimized for portable battery-powered systems, delivering up to 1.0 A at a fixed 1.2 V output from 2.7–5.5 V input. It features 1.7 MHz switching, 96% peak efficiency, integrated soft-start, and thermal shutdown. Used in smartphones, USB-powered devices, and digital cameras for compact, low-ripple power conversion.
For engineers reviewing the NCP1529MU12TBG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package mapping, real-world application cards, and validated alternative options - all grounded in onsemi's official NCP1529/D Rev. 7 datasheet (September 2024).
Technical Context
The NCP1529MU12TBG implements constant-frequency current-mode control with internal P-channel high-side and N-channel synchronous rectifier MOSFETs (RONHS = 400 mΩ, RONLS = 300 mΩ). It operates in automatic PWM/PFM mode: PWM at ≥100 mA load (1.7 MHz ±0.5 MHz), PFM at light loads to minimize quiescent current (28 µA typical).
Regulation relies on a 0.6 V internal reference and feedback loop stability optimized for 2.2 µH inductor + 10 µF output capacitor. Protection includes cycle-by-cycle current limiting (1.6 A peak), undervoltage lockout (2.4 V typ, 100 mV hysteresis), and thermal shutdown (180°C trip, 40°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±3% over temperature; enables direct replacement of LDOs in 1.2 V core logic rails. |
| Max Output Current | 1.0 A continuous; supports single-core microcontrollers or baseband processors without external current boosting. |
| Switching Frequency | 1.7 MHz nominal (1.2–2.2 MHz range); allows use of 2.2 µH inductors & 10 µF ceramic capacitors for ultra-compact filter design. |
| Input Voltage Range | 2.7 V to 5.5 V; compatible with single-cell Li-ion (3.0–4.2 V), three-cell alkaline/NiMH (3.6–4.5 V), and USB 5 V inputs. |
| Quiescent Current | 28 µA typical in active PFM mode; extends battery runtime in always-on sensor or standby subsystems. |
| Shutdown Current | 0.3 µA typical; meets ultra-low-power requirements for host-controlled power gating in portable equipment. |
| Feedback Reference | 0.6 V internal reference; eliminates need for external resistor divider in fixed-output variants like NCP1529MU12TBG. |
Pinout & Package
The NCP1529MU12TBG is packaged in a Pb-free 2 mm × 2 mm × 0.5 mm UDFN6 (MU suffix, Case 517AB) with exposed thermal pad (Pin 7) requiring connection to system ground for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Connects to regulated output via internal 0.6 V reference; unused in fixed 1.2 V version but must be tied to GND per datasheet. |
| 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 | Accepts 2.7–5.5 V input; requires local 4.7 µF ceramic decoupling placed adjacent to pin. |
| 5 (EN) | Enable Control | Active-high logic input (VIH ≥ 1.2 V, VIL ≤ 0.4 V); controls startup/soft-start and shutdown (ISTB = 0.3 µA). |
| 6 (SW) | Switch Node | Drives external inductor; carries high di/dt square wave - requires short, wide trace and tight layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and enabling >96% efficiency at 1 A. |
| Auto PWM/PFM mode | Seamlessly transitions between modes to maintain <3% output regulation while minimizing light-load current draw. |
| Integrated soft-start | 310–500 µs ramp time prevents inrush current damage to input capacitors and upstream power sources. |
| Thermal shutdown with hysteresis | Shuts down at 180°C junction temp and re-enables only after cooling to 140°C - prevents thermal cycling failure. |
| Full ESD protection | HBM >2 kV and MM >200 V on all pins - ensures robustness during board assembly and end-user handling. |
Applications
| Smartphone Application Processor Core | USB-Powered IoT Sensor Node |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series application processor core requiring stable 1.2 V @ 800 mA during burst activity. IC Role / Device Role / Timing Role: Primary step-down regulator supplying core voltage rail; operates in PWM mode under load, switches to PFM during idle. Use Value: Delivers 94% efficiency at 800 mA (VIN = 3.6 V), minimizing heat buildup in thermally constrained smartphone chassis. |
Use Scenario: Supplies 1.2 V to ultra-low-power MCU and BLE radio in battery-backed USB-powered environmental sensor. IC Role / Device Role / Timing Role: Main system regulator; enters PFM mode at <10 mA load to extend battery life beyond 1 year on coin cell + USB trickle charge. Use Value: 28 µA quiescent current and 0.3 µA shutdown current enable true "zero-power" sleep states without external load switches. |
| Digital Camera Image Signal Processor (ISP) | Portable Audio DAC Power Rail |
|
Use Scenario: Provides clean 1.2 V supply to ISP during image capture, where transient load steps exceed 500 mA in <1 µs. IC Role / Device Role / Timing Role: High-speed transient-responsive buck converter; uses internal compensation tuned for 2.2 µH/10 µF output filter. Use Value: Load transient response of ≤85 mV (200→600 mA step) maintains ISP functionality without frame corruption or reset. |
Use Scenario: Generates low-noise 1.2 V for stereo audio DAC in portable Bluetooth speaker, rejecting switching noise from adjacent RF sections. IC Role / Device Role / Timing Role: Low-ripple power source; achieves 3.0 mVPP ripple at 300 mA via 1.7 MHz frequency and synchronous topology. Use Value: Ripple performance meets DAC PSRR requirements without additional LC filtering, saving PCB area and BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.2 V, 1.7 MHz, 0.8–6 V input, 600 mA max, 22 µA IQ | Lower current rating; lacks thermal shutdown hysteresis and PFM mode optimization for sub-10 mA loads | Choose for space-constrained designs needing lower IQ, but verify thermal margin at full 1 A. |
| RT8059GJ6 | Adjustable 0.6–5.5 V, 1.5 MHz, 2.5–5.5 V input, 1 A, 35 µA IQ | Requires external resistor divider; no fixed 1.2 V variant; lacks integrated soft-start timing control | Select when output voltage flexibility is required, but expect added BOM cost and layout complexity vs. NCP1529MU12TBG. |
Compared with TPS62231DRYR and RT8059GJ6, the NCP1529MU12TBG delivers higher current capability with superior thermal protection behavior and factory-trimmed 1.2 V accuracy - making it optimal for production-critical portable systems where reliability and drop-in simplicity outweigh minor IQ differences.
Availability
NCP1529MU12TBG is available at Aetrix Electronics and suitable for smartphone power management, USB-powered IoT nodes, and portable audio systems requiring stable component supply and long-term lifecycle support.
Supply support for NCP1529MU12TBG 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 NCP1529MU12TBG belongs to onsemi's high-efficiency DC-DC converter product line, designed specifically for space- and battery-life-constrained portable applications requiring minimal external components and robust protection.
FAQ
What is the output voltage tolerance of the NCP1529MU12TBG across temperature and load?
The NCP1529MU12TBG provides a fixed 1.2 V output with ±3% total tolerance over −40°C to +85°C ambient temperature and full 0–1.0 A load range. This specification includes initial accuracy, line regulation (0.05% typical), load regulation (±1.1%), and temperature drift - all verified per onsemi's NCP1529/D Rev. 7 datasheet Section 5.
Does the NCP1529MU12TBG require an external feedback resistor network?
No. The NCP1529MU12TBG is the fixed 1.2 V variant and does not require external resistors for output setting. Its FB pin must be connected directly to GND per datasheet guidance (Page 14, Ordering Information), unlike adjustable versions such as NCP1529MUTBG which use R1/R2 dividers.
What package type and thermal characteristics apply to the NCP1529MU12TBG?
The NCP1529MU12TBG uses the UDFN6 package (2 mm × 2 mm × 0.5 mm, Case 517AB) with exposed thermal pad (Pin 7). Its junction-to-air thermal resistance is 40°C/W using the recommended board layout - significantly lower than the TSOP-5 option - enabling reliable 1 A operation at +85°C ambient.
How does the NCP1529MU12TBG handle short-circuit conditions?
Under output short-circuit, the NCP1529MU12TBG limits peak inductor current to 1.6 A (typical) and reduces duty cycle to sustain ~550 mA input current. It remains in current-limit mode until fault clears, then automatically resumes normal soft-start operation - no latch-off or manual reset required.
Is the NCP1529MU12TBG suitable for USB 5 V input applications?
Yes. The NCP1529MU12TBG supports VIN up to 5.5 V and delivers 1.2 V at up to 1.0 A from 5 V input with >90% efficiency (Figure 28, datasheet). It maintains low ripple (<3 mVPP) and tight load regulation (±1.1%) - ideal for USB-powered peripherals needing clean, efficient core voltage rails.
NCP1529MU12TBG 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- 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)
NCP1529MU12TBG FAQ
1.How can I place an order for NCP1529MU12TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1529MU12TBG 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 NCP1529MU12TBG reliable?
The price and inventory of NCP1529MU12TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1529MU12TBG is usually 5 days.
3.What payment methods are accepted for NCP1529MU12TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1529MU12TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1529MU12TBG?
NCP1529MU12TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1529MU12TBG 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 NCP1529MU12TBG?
For technical support, including NCP1529MU12TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1529MU12TBG requirements.
6.How does Aetrix verify that NCP1529MU12TBG is sourced from the original manufacturer or authorized distributors?
All NCP1529MU12TBG 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 NCP1529MU12TBG meets industry standards.
7.What is the process for return or replacement of NCP1529MU12TBG?
All NCP1529MU12TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1529MU12TBG, 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 NCP1529MU12TBG part is unused and in its original packaging.
Return procedure for NCP1529MU12TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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