NCP1450ASN30T1

Frequency - Switching:	180kHz
Base Part Number:	NCP1450A
Supplier Device Package:	5-TSOP
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	80%
Series:	--
Voltage - Supply (Vcc/Vdd):	0.9 V ~ 6 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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NCP1450ASN30T1 Application Field and Working Principle

The NCP1450ASN30T1, a DC-DC switching controller, is a member of the NCP1400 Series, a set of products that provide Buck and Buck-Boost current-mode step-down and step-up DC-DC converters. This device is capable of delivering up to 3A load current for a wide range of applications. It features an integrated 50V MOSFET driver with an adjustable transition time between the high-side and the low-side MOSFETs. The NCP1450ASN30T1 also has an adjustable P-ch current limit, a hiccup-mode protection feature, an undervoltage protection feature, and built-in soft-start.

Applications

The NCP1450ASN30T1 can drive a wide variety of applications such as:

• Portable systems
• Battery-powered systems
• High-efficiency LED lighting
• DC/DC converters

Working Principle

The NCP1450ASN30T1 is a current-mode PWM controller designed to drive buck and buck-boost DC-DC converters. It contains a 50V MOSFET driver and an integrated high-side P-channel MOSFET current limiter. It also features a hiccup-mode protection feature and an undervoltage protection feature.The NCP1450ASN30T1 uses a voltage mode control architecture with an adjustable pulse width modulation (PWM) frequency up to 500kHz. This device has an adjustable transition time between the high side and low side MOSFETs for 0.5V to 2.4V output regulation. This PWM controller uses a voltage between the FB_UV and FB_OV pins to regulate its output voltage. In normal operation, the output voltage is limited by an error amplifier that compares the voltage at the FB_UV and FB_OV pin with a reference voltage at the REF pin. The output voltage is linearly regulated by controlling the duty cycle of the PWM based on the error voltage.In addition, the current limit of the NCP1450ASN30T1 is adjustable with an external signal at the ILIM pin. This adjustable current limit helps protect the MOSFETs from excessive current.Furthermore, a current mirror circuit monitors both the high-side and low-side MOSFETs and senses the inductor current. This current information is used to generate an accurate peak current limit signal. When the peak current limit is reached, the controller switches the current sources off and enters a hiccup-mode protection state.Finally, an undervoltage protection feature prevents the device from overheating by disabling the high-side MOSFET if the output drops below its preset limit.

Conclusion

The NCP1450ASN30T1 is a DC-DC switching controller that is capable of delivering up to 3A load current and is designed to drive buck and buck-boost DC-DC converters. It features integrated 50V MOSFET driver, an adjustable pulse width modulation (PWM) frequency up to 500kHz, adjustable P-ch current limit, hiccup-mode protection feature and undervoltage protection feature. This device is suitable for portable systems, battery-powered systems, high-efficiency LED lighting, and DC/DC converters.

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