LM2727MTCX/NOPB Integrated Circuits (ICs)

Frequency - Switching:	50kHz ~ 2MHz
Base Part Number:	LM2727
Supplier Device Package:	14-TSSOP
Package / Case:	14-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	90%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 5.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LM2727MTCX/NOPB is a family of high-performance, monolithic, DC-DC switching controllers. It is designed to deliver up to 1.8-A current, with up to 550-mV of input/output differential, and requires minimal external components. It integrates a wide range of features, including an adjustable voltage reference (VREF), a programmable VREF soft-start timer, an analog latch current-limit feature, and onboard sensing and feedback terminal (FB). This family of devices is suitable for applications such as portable computers, telecommunications, automotive, and other systems that require precise power control.

Application Fields

The LM2727MTCX/NOPB offers a variety of application fields, including portable computers and Tablet PCs, automotive electronics, avionics, and consumer products. The wide output voltage range and adjustable VREF enables the LM2727MTCX/NOPB to be used in applications that require a wide range of output voltages with high accuracy. The programmable VREF soft-start timer helps in controlling the output current or voltage ramp-ups, reducing the stress on the power supply. This is especially useful in automotive applications, where the input power can vary considerably. The combination of wide input/output differential and high current delivery makes the LM2727MTCX/NOPB an ideal choice for applications that require precise power delivery. Its onboard sensing and feedback terminal (FB) can be used to detect voltage or current levels, providing precise control of output power. In addition, its low quiescent current consumption and shutdown feature makes it a great choice for applications that require power-saving capabilities, such as portable electronic devices.

Working Principle

The LM2727MTCX/NOPB operates using a two-stage, pulse width modulation (PWM) topology. The device uses a built-in voltage reference (VREF) to separate the high-side switch from the low-side switch. Additionally, the VREF is adjustable with an external resistor (RADJ) and able to be specified by the user from 0.5V to 0.7V. The reference voltage level is compared with an external feedback voltage at the FB pin to control the output voltage. The internal control loop uses the voltage-mode PWM, and determines the duty cycle of the PWM waveform in order to maintain the output voltage.The LM2727MTCX/NOPB also includes a programmable VREF soft-start timer, which allows the output voltage to rise from the minimum level and ramps up linearly, thus reducing the output voltage peak and current level. This can help reduce the stress on power supply components and at the same time, is useful in avoiding output voltage overshoot or turn-on transients.The LM2727MTCX/NOPB has an analog latch current-limit feature, which provides an indication of the maximum current limit level. When the current reaches the preset threshold, the power supply is shut down to protect the power supply components and circuitry. This method of current-limit detection avoids cross-conduction in the power stage and minimizes power losses.

Conclusion

The LM2727MTCX/NOPB provides a wide range of benefits for many applications, such as portable electronic devices, automotive electronics, and avionics. The wide input/output differential, wide output voltage range, programmable VREF soft-start timer, and analog latch current-limit feature of the device ensure accurate and precise current and voltage control. Furthermore, the low quiescent current consumption and shutdown feature ensures power savings. Overall, the LM2727MTCX/NOPB is a suitable choice for power management applications.

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