NCP1402SN27T1

Voltage - Output (Min/Fixed):	2.7V
Base Part Number:	NCP1402
Supplier Device Package:	5-TSOP
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	Up to 200kHz
Current - Output:	130mA (Switch)
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	2.7V
Voltage - Input (Min):	0.8V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The NCP1402SN27T1 is a highly integrated, monolithic, DC-DC switching regulator in a 5.0mm × 5.0mm QFN ES2 package. It is designed to provide a simple, low-cost and efficient solution for processor core voltage in deep sub-micron technology with up to 1.5A of output current. It integrates a full-featured buck converter with an optimal combination of high-density integration, simplicity, cost and efficiency. It is optimized to work with flat-pack and other shrinkable packages.

Application Field and Working Principle

The NCP1402SN27T1 is suitable for a wide range of applications, such as cellular phones, digital cameras, PDAs and other portable devices, due to its superior integration, cost and efficiency. The NCP1402SN27T1 can also be used in automotive and industrial applications requiring tight solutions for temperature and power consumption.The NCP1402SN27T1 works on a buck-boost architecture. A sync buck converter controller is used and the feedback voltage is derived from the drain of the low side switch. The feedback voltage is compared with the reference voltage and the difference (error signal) is amplified internally. The amplified error signal drives a gate driver and is then used to drive the low side MOSFET according to the output voltage requirement.The core features of the NCP1402SN27T1 includes: Internal soft-start and synchronization, wide input voltage range (2.7V to 18V), adjustable output voltage range (0.7V to 5.0V), adjustable output current (up to 1.5A), adjustable switching frequency (100kHz to 2MHz), and external protection: Under voltage (UV) and over voltage protection (OVP). The converter is protected from over-temperature conditions and short circuit.

Design Considerations

In designing with the NCP1402SN27T1, some considerations must be taken into account to ensure a reliable and robust solution. These considerations include:

• Proper selection of components – It is important to choose components that are best suited for the application and operate within the DC and AC performance limits of the NCP1402SN27T1.
• Design for proper decoupling – Selection of adequate decoupling capacitors is critical for proper converter operation and efficiency. A minimum 1µF ceramic capacitor should be placed across the output voltage.
• Thermal considerations – Careful evaluation of the power consumption, layout and thermal conditions is necessary to ensure proper operation of the buck converter.

Conclusion

The NCP1402SN27T1 is a highly integrated, monolithic, DC-DC switching regulator. It is designed to provide a simple, low-cost and efficient solution for processor core voltage in deep sub-micron technology with up to 1.5A of output current. The NCP1402SN27T1 is suitable for a wide range of portable applications, such as cellular phones, digital cameras, PDAs and other portable devices. It is also suited for automotive and industrial applications requiring tight solutions for temperature and power consumption. Careful selection of components, decoupling and thermal management are critical to ensuring reliable operation and efficient regulation.

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