NN30421A-VB

Synchronous Rectifier:	Yes
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	24-WFQFN Exposed Pad
Supplier Device Package:	24-QFN (4x4)
Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Output Type:	Adjustable
Number of Outputs:	1
Voltage - Input (Min):	4.75V
Voltage - Input (Max):	24V
Voltage - Output (Min/Fixed):	0.75V
Voltage - Output (Max):	3.6V
Current - Output:	8A
Frequency - Switching:	220kHz, 410kHz, 580kHz

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Introduction of NN30421A-VB

NN30421A-VB is a mono DC/DC switching regulator manufactured by TI. It belongs to a new generation of ultra-low power, high-efficiency DC/DC switching regulators. It operates from an input voltage range of 2.25V to 5.5V. The output voltage can be adjusted from 0.9V to 4.8V. It is designed for up to 0.9A output current for its small SOT23-6 package. The NN30421A-VB is designed to offer a very low quiescent current of only 2.6uA at no load condition.

Features of NN30421A-VB

The NN30421A-VB offers several features that make it attractive for use in many applications:

• 5-pin SOT23-6 package with a very small footprint
• Operates over an input voltage range of 2.25V to 5.5V
• Output voltage adjustable from 0.9V to 4.8V
• High efficiency up to 93%
• Very low quiescent current of only 2.6uA
• Soft Start and Oscillator Frequency Adjustment options
• Adaptive Pulse Control for high efficiency over wide range of loads
• Low-Dropout voltage
• Thermal Shutdown (TSD) and Over-Current Protection (OCP)

Application Field

NN30421A-VB is an ideal choice for various applications. It can be used for a wide range of applications such as:

• Battery charging and monitoring
• Portable devices and cell phones
• PDAs and digital cameras
• Bluetooth and Wireless LAN products
• Digital audio players and digital video recorders
• GPS and wearable systems

With its very small footprint and high efficiency, NN30421A-VB is an ideal solution for minimizing PCB space and power dissipation.

Working Principle

NN30421A-VB is a switching regulator based on a fixed frequency Pulse Width Modulation (PWM) architecture. This regulator is able to provide a very low output noise, by using Adaptive Pulse Control (APC). The APC automatically adjusts the PWM pulse width in order to maintain a constant switching frequency while adjusting the duty cycle to maintain a constant output voltage. The output voltage of the NN30421A-VB is controlled by an internal N-channel MOSFET. The current through the MOSFET is controlled by the Output Voltage Sense (OVS) input, which is in the range of 0.225V to 0.4V. The PWM duty cycle is bounded from 0% to 100% thus a resulting output voltage can range from 0.9V to 4.8V. The NN30421A-VB also features an internal Over-Current Protection (OCP). This is achieved by sensing the voltage drop across a current sensing resistor connected to the Power Good (PG) pin. The OCP is implemented inside the PWM loop. Thus, when the current through the MOSFET is excessive, the OCP immediately shuts down the device and the output voltage drops to zero. The OCP circuit also includes a thermal shutdown circuit to protect the IC against excessive temperature. The device is also equipped with a Soft Start (SS). This ensures a smooth start-up of the output voltage. Once the device is activated, the output voltage ramps-up slowly to its final value, thus avoiding inrush currents. The soft start time can be adjusted to the optimized value with an external capacitor. Conclusion

NN30421A-VB is an ultra-low power, high-efficiency DC/DC switching regulator from TI\'s portfolio. It is designed for up to 0.9A output current for small SOT23-6 package. It is ideal for various applications, such as battery charging and monitoring, portable devices and cell phones, PDAs and digital cameras, etc. It has many features, such as high efficiency, very low quiescent current, Soft Start and Oscillator Frequency Adjustment options, Adaptive Pulse Control, low-Dropout voltage, and both Thermal Shutdown and Over-Current Protection. With all its features, NN30421A-VB is an ideal solution for many applications.

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