L6727

Frequency - Switching:	300kHz
Base Part Number:	L6727
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-20°C ~ 85°C (TA)
Control Features:	Enable, Phase Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	80%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.1 V ~ 13.2 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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L6727 Application Field and Working Principle

Introduction

The L6727 is a step-down DC/DC switching controller from STMicroelectronics, a division of STMicroelectronics N.V. It is primarily used to provide a power source for portable and fixed applications such as medical, automotive, and consumer electronics. This device integrates a high-frequency PWM modulator, high-efficiency synchronous rectifier, and programmable cycle-by-cycle current limit in a single package.

Features

The L6727 features synchronic boost continuous conduction mode (CCM) control with valley current sensing, dead time control and a variety of protection functions. The device can be used to generate voltages as low as 0.8V from an input voltage of 4.5V to 28V. The high switching frequency of the device, up to 2.2 MHz, allows for small external components for reduced solution size. The device is available in a 6-pin SOT23 package, making it ideal for space-constrained applications.

Block Diagram

The block diagram of the L6727 is as illustrated below:

Application Fields

The L6727 is well suited for a range of applications due to its wide input and output voltage range, high switching frequency, low parts count and its small 6-pin SOT23 package. Applications include power supplies for medical, automotive, consumer and industrial systems, as well as battery-powered devices such as cell phone chargers, PDAs, cameras, and audio players.

Working Principle

The working principle of the L6727 is based on the control of the output voltage through the activation of an external MOSFET switch, which is closed for part of the switching cycle determined by the Pulse Width Modulator (PWM) signal.The device generates a PWM signal to the external MOSFET switch, with a frequency determined by the external resistor connected to the PWM pin. The switching action is synchronized with the Valley Current Sense signal, with the input voltage being sensed during the rising edge of the PWM signal and the output voltage being sensed during the falling edge.The peak-current sensing circuit regulates the maximum current supplied by the MOSFET switch. The peak current is proportional to the current sense resistor and can be programmed to the desired value.The cycle-by-cycle current limit and dead time control are used to ensure protection against short circuit, over temperature and over voltage.

Conclusion

The L6727 is an ideal solution for a variety of applications requiring a small, efficient and cost-effective DC/DC switching controller. It features a high-frequency PWM modulator, a high-efficiency synchronous rectifier, and programmable current limit and dead time control, all in a small 6-pin SOT23 package. The device is suitable for a wide range of applications including medical, automotive, consumer and industrial electronics, as well as battery-powered devices such as cell phones, PDAs, cameras, and audio players.

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