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onsemi NCP1529ASNT1G
- Part No.:
- NCP1529ASNT1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP1529ASNT1G.pdf
- Description:
- IC REG BUCK ADJ 1A 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
NCP1529ASNT1G from onsemi is a synchronous step-down 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 a TSOP-5 package.
For engineers reviewing the NCP1529ASNT1G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load behavior, real-world ripple performance (≤8 mVPP at no load), and precise thermal shutdown threshold (180°C) - all critical for Li-ion-powered handheld design validation.
Technical Context
The NCP1529ASNT1G implements a constant-frequency current-mode buck architecture with integrated high-side PMOS (400 mΩ RDS(on)) and low-side NMOS (300 mΩ RDS(on)) switches, enabling synchronous rectification and eliminating external diode losses. Its internal 0.6 V reference and feedback loop support precise output regulation across temperature.
It features automatic PWM/PFM mode transition: fixed 1.7 MHz PWM operation under medium-to-heavy loads ensures tight line/load regulation (±1.1% load regulation, ±0.05% line regulation), while PFM mode at light loads reduces quiescent current to 28 µA and standby current to 0.3 µA - directly extending battery runtime in always-on subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.0 A max - supports single-core microcontrollers and RF transceivers without external boost stages. |
| Switching Frequency | 1.7 MHz nominal - enables use of compact 2.2 µH inductors and 10 µF ceramic output capacitors. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion (2.7–4.2 V) and USB 5 V rail inputs. |
| Feedback Reference | 0.6 V - sets output via resistor divider; allows 0.9–3.9 V adjustment with standard 1% resistors. |
| Quiescent Current | 28 µA - maintains ultra-low power draw during active sleep modes in portable devices. |
| Thermal Shutdown | 180°C activation - protects against sustained overload or poor PCB thermal design in confined enclosures. |
| UVLO Threshold | 2.4 V (typ) with 100 mV hysteresis - prevents erratic startup during battery sag or cold-temperature discharge. |
Pinout & Package
The NCP1529ASNT1G is packaged in a lead-free TSOP-5 (3.0 × 1.5 × 0.95 mm) surface-mount package with exposed pad not present; all five pins are solderable and fully ESD-protected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Analog Input | Active-HIGH enable: logic HIGH ≥1.2 V enables regulation; LOW ≤0.4 V forces shutdown (0.3 µA ISTB). |
| 2 (GND) | Power Ground | Main ground reference for power stage and analog circuitry; must connect to system ground plane with low-inductance path. |
| 3 (SW) | Analog Output | Switch node connecting internal MOSFETs to external inductor; carries high di/dt pulses requiring short, wide trace routing. |
| 4 (FB) | Analog Input | Feedback input referenced to 0.6 V internal reference; connects to resistor divider midpoint for output voltage setting. |
| 5 (VIN) | Power Input | Main supply input (2.7–5.5 V); requires local 4.7 µF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NMOS replaces Schottky diode, reducing conduction loss and enabling >96% efficiency at 1 A. |
| Auto PWM/PFM mode | Seamless transition between fixed-frequency PWM (for regulation accuracy) and pulse-frequency modulation (for µA-level light-load current). |
| Integrated soft-start | 310–500 µs ramp time limits inrush current during power-up, preventing input rail collapse in shared-bus systems. |
| Cycle-by-cycle current limit | 1.6 A peak inductor current limit protects against short-circuit faults and inductor saturation during transient overloads. |
| Full ESD protection | All pins rated to 2 kV HBM and 200 V MM - eliminates need for external TVS in typical handheld ESD environments. |
Applications
| Cellular Handsets | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2 V) and RF front-end bias rails (1.35 V or 3.3 V) from single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck regulator supplying regulated, low-noise DC power with fast load transient response (<85 mV deviation for 200→600 mA step). Use Value: Enables direct Li-ion operation without intermediate LDOs, preserving >90% system efficiency at 600 mA while meeting 3G/4G RF noise specs (≤8 mVPP ripple). | Use Scenario: Supplying image sensor analog core (1.2 V), digital I/O (1.8 V via external resistor), and flash LED driver bias (3.3 V) from alkaline/NiMH battery pack. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting multiple rail voltages via single BOM variant, configured by feedback resistor selection. Use Value: Reduces bill-of-materials count by eliminating separate fixed-voltage regulators; 1.7 MHz switching avoids audible noise in audio-sensitive camera modules. |
| USB-Powered Peripherals | Portable Audio Systems |
Use Scenario: Regulating 5 V USB input down to 3.3 V or 3.9 V for Wi-Fi/BLE SoCs and memory interfaces in dongles or adapters. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating exclusively in PWM mode at 5 V input, delivering up to 600 mA with <2% load regulation. Use Value: Meets USB 2.0 power budget constraints (500 mA max) while sustaining full throughput; achieves 85–95% efficiency across 10–600 mA load range per Figure 28. | Use Scenario: Powering DSP, DAC, and headphone amplifier stages in MP3 players and Bluetooth speakers powered by 3×AA alkaline (4.5 V) or Li-ion (3.7 V). IC Role / Device Role / Timing Role: Main system power rail generator with low quiescent current (28 µA) and fast PFM-to-PWM wake-up for playback start-up. Use Value: Extends battery life by >20% versus non-synchronous alternatives; soft-start prevents pop-noise in audio output during power-on sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3 MHz switching frequency, 0.6 V reference, 1 A output; smaller 1.2×1.2 mm DSBGA package. | Higher fSW enables smaller passives but increases EMI sensitivity; lacks PFM mode - higher light-load IQ (17 µA vs. 28 µA). | Preferred where board space is critical and EMI filtering is already implemented; not drop-in due to different pinout and control logic. |
| RT8059NGSP | 1.5 MHz fSW, 0.6 V reference, 1 A output; includes power-good flag and adjustable soft-start. | Requires external PG pull-up; soft-start time programmable (0.1–10 ms) vs. fixed 310–500 µs; same TSOP-5 footprint but EN polarity differs (active-low). | Chosen when system-level power sequencing or status monitoring is required; pin-compatible only if EN logic inversion is accommodated. |
Compared with TPS62231DRYR and RT8059NGSP, the NCP1529ASNT1G delivers superior light-load efficiency via true PFM mode and lower thermal resistance in TSOP-5 (110°C/W vs. ~150°C/W typical for DSBGA), making it more suitable for thermally constrained handheld designs with variable duty cycles.
Availability
NCP1529ASNT1G is available at Aetrix Electronics and suitable for cellular handsets, digital still cameras, and USB-powered peripherals requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for NCP1529ASNT1G 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 power management, analog, and sensing technologies for automotive, industrial, and portable electronics.
The NCP1529ASNT1G belongs to onsemi's high-efficiency DC-DC converter product line, engineered specifically for space-constrained, battery-operated devices demanding low quiescent current, wide input range, and robust thermal protection.
FAQ
What is the maximum output voltage supported by the NCP1529ASNT1G?
The NCP1529ASNT1G supports an adjustable output voltage range from 0.9 V to 3.9 V when used with an external resistor divider. This upper limit applies specifically to USB or 5 V rail-powered applications (VIN = 4.3–5.5 V). For lower input voltages, the maximum achievable VOUT is constrained by duty cycle limits and must remain below VIN. Fixed versions offer 1.2 V or 1.35 V outputs, but the NCP1529ASNT1G is the adjustable variant.
Does the NCP1529ASNT1G require an external feed-forward capacitor?
Yes - for stable operation in adjustable configurations, the NCP1529ASNT1G requires a minimum 18 pF feed-forward capacitor (CFF) between VOUT and FB. This capacitor improves phase margin and loop stability, especially with low-ESR ceramic output capacitors. Using ≥1 nF further extends soft-start time and reduces inrush current, as confirmed in the datasheet's Application Information section.
What is the thermal shutdown behavior of the NCP1529ASNT1G?
The NCP1529ASNT1G activates thermal shutdown at 180°C (typical junction temperature) and remains latched off until the junction cools to approximately 140°C (40°C hysteresis), after which it automatically restarts via soft-start. This behavior is documented in the Maximum Ratings and Protection sections, ensuring reliable recovery from temporary overheating without manual reset.
Can the NCP1529ASNT1G operate with a 2.5 V input supply?
No - the NCP1529ASNT1G has a minimum input voltage of 2.7 V, enforced by its undervoltage lockout (UVLO) circuit, which disables switching below 2.2–2.55 V (min/typ/max). At 2.5 V, the device remains in shutdown with only 0.3 µA standby current. Operation is guaranteed only within the 2.7–5.5 V range specified in Electrical Characteristics.
What package type does the NCP1529ASNT1G use, and is it RoHS-compliant?
The NCP1529ASNT1G uses the TSOP-5 package (3.0 × 1.5 × 0.95 mm, case 483), marked "DXJ" and shipped in tape-and-reel format (3000 units/reel). It is explicitly designated as Pb-Free per the datasheet's ordering table and marking diagram, meeting RoHS Directive 2011/65/EU requirements without exemption claims.
NCP1529ASNT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- 5-TSOP
NCP1529ASNT1G FAQ
1.How can I place an order for NCP1529ASNT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1529ASNT1G 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 NCP1529ASNT1G reliable?
The price and inventory of NCP1529ASNT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1529ASNT1G is usually 5 days.
3.What payment methods are accepted for NCP1529ASNT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1529ASNT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1529ASNT1G?
NCP1529ASNT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1529ASNT1G 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 NCP1529ASNT1G?
For technical support, including NCP1529ASNT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1529ASNT1G requirements.
6.How does Aetrix verify that NCP1529ASNT1G is sourced from the original manufacturer or authorized distributors?
All NCP1529ASNT1G 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 NCP1529ASNT1G meets industry standards.
7.What is the process for return or replacement of NCP1529ASNT1G?
All NCP1529ASNT1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1529ASNT1G, 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 NCP1529ASNT1G part is unused and in its original packaging.
Return procedure for NCP1529ASNT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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