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NCP1529ASNT1GEVB: 0.9 ~ 3.9V @ 1A, 2.7 ~ 5.5V in


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 – available in an adjustable output voltage from 0.9 V to 3.9 V – is able to deliver up to 1 A. 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 2x2 x 0.5 mm UDFN6 package and TSOP−5 package.


Manufacturer ON Semiconductor
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number NCP1529ASNT1GEVBOS-ND
Eval Board Supplier ON Semiconductor
Eval Board -
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 0.9 ~ 3.9 V
Current Out 1 A
Voltage In 2.7 ~ 5.5 V
Efficiency @ Conditions >90%, 3.6V in, 3.3V @ 10 ~ 600 mA
>75%, 3.6V in, 1.2V @ 10 ~ 600 mA
>70%, 3.6V in, 0.9V @ 10 ~ 550 mA
Voltage Out Range 0.9 ~ 3.9 V
Features Current Limit (Adj. or Fixed)
ESD Protection
Short Circuit Protection
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 1.7 MHz
Standby Current [Typical] 300 nA
Quiescent Current [Typical] 28 µA
Component Count + Extras 8 + 12
Internal Switch Yes
Design Author ON Semiconductor
Application / Target Market Cellular Phone
Digital Cameras
Portable Devices
USB Powered Devices
Standby Current [Maximum] 1 µA
Quiescent Current [Maximum] 39 µA
Main I.C. Base Part NCP1529
Date Created By Author 2012-04
Date Added To Library 2016-05

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