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Manufacturer Part #


NCP1529 Series 1.7 MHz 1 A Surface Mount Buck Converter - TSOP-5

ECAD Model:
Mfr. Name: onsemi
Standard Pkg:
Product Variant Information section
Date Code: 2250
Product Specification Section
onsemi NCP1529ASNT1G - Technical Attributes
Attributes Table
Topology: Buck
Input Voltage: 2.7V to 5.5V
Output Current-Max: 1A
Output Type: Adjustable
Switching Frequency-Max: 2.2MHz
Operating Temp Range: -40°C to +85°C
Duty Cycle-Max: 100%
Efficiency: 96%
No. of Outputs: 1
Quiescent Current: 28µA
Storage Temperature Range: -55°C to +150°C
Load Regulation (%): 1.1%
Moisture Sensitivity Level: 1
Package Style:  SC-74A (TSOP-5, SOT-25)
Mounting Method: Surface Mount
Features & Applications

The NCP1529 step−down DC−DC converter is a monolithic integrated circuit for portable applications powered from one cell Li−ion or three cell Alkaline/NiCd/NiMH batteries. The device is able to deliver up to 1.0 A on an output voltage range externally adjustable from 0.9 V to 3.9 V or fixed at 1.2 V or 1.35 V. It uses synchronous rectification to increase efficiency and reduce external part count.

The device also has a built−in 1.7 MHz (nominal) oscillator which reduces component size by allowing a small inductor and capacitors. Automatic switching PWM/PFM mode offers improved system efficiency. Additional features include integrated soft−start, cycle−by−cycle current limiting and thermal shutdown protection. The NCP1529 is available in a space saving, low profile 2x2x0.5 mm UDFN6 package and TSOP−5 package.

Key Features:

  • Up to 96% Efficiency
  • Best In Class Ripple, including PFM mode
  • Source up 1.0 A
  • 1.7 MHz Switching Frequency
  • Adjustable from 0.9 V to 3.9 V or Fixed at 1.2 V or 1.35 V
  • Synchronous rectification for higher efficiency
  • 2.7 V to 5.5 V Input Voltage Range
  • Low Quiescent Current 28 µA
  • Shutdown Current Consumption of 0.3 µA
  • Thermal Limit Protection
  • Short Circuit Protection
  • All Pins are Fully ESD Protected
  • These are Pb−Free Devices


  • Cellular Phones, Smart Phones and PDAs
  • Digital Still Cameras
  • MP3 Players and Portable Audio Systems
  • Wireless and DSL Modems
  • USB Powered Devices
  • Portable Equipment
Pricing Section
Global Stock:
Germany (Online Only):
Factory Stock:Factory Stock:
Factory Lead Time:
34 Weeks
Minimum Order:
Multiple Of:
Web Price
Product Variant Information section