LM27213SQ

Frequency - Switching:	--
Base Part Number:	LM27213
Supplier Device Package:	48-WQFN (7x7)
Package / Case:	48-WFQFN Exposed Pad
Operating Temperature:	-5°C ~ 105°C (TA)
Control Features:	Current Limit, Enable, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4.75 V ~ 6 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction
The LM27213SQ is a fast-transitioning synchronous step-down DC-DC controller with a wide input voltage range that supports up to 28V input voltage. It is a highly efficient, highly integrated synchronous step-down DC-DC controller that does not require an external regulator. It integrates one high-side switch, one low-side switch, one synchronous rectifier, one current-sense amplifier, one current monitoring comparator and one voltage reference. The device supports an input voltage range of 6 V to 28 V and output voltage range of 0.6 V to 6.5 V. The LM27213SQ operates in either forced-PWM or constant-ON-time modes and provides fixed frequency, adjustable frequency and adjustable voltage operation.

Application field
The LM27213SQ can be used in a wide variety of applications such as system voltage regulators and power management in notebook computers, digital cameras, PDAs and video gaming consoles. The device can also be used in applications such as automotive systems, high voltage battery chargers, switched-mode power supplies (SMPS) and PLCs. The LM27213SQ is also suitable for powering low-power, low-voltage DC motors and other applications.

Working Principle
The LM27213SQ uses a synchronous rectifier arrangement to maximize efficiency. The LM27213SQ contains a high-side and a low-side power MOSFET to create a synchronous buck regulator. The device converts a high voltage input to a low voltage output. The device uses a pulse width modulation (PWM) regulation scheme that adjusts the duty cycle of the PWM signal to control the voltage of the output. The LM27213SQ implements a current-mode control with a peak-current control duty cycle limit feature that prevents excessive duty cycle.When the duty cycle is greater than the peak-current control limit, the peak current is limited and the device automatically enters skip mode. The device operates in forced-PWM or constant-ON-time while in skip mode. The device utilizes a voltage mode control loop that reduces the feedback voltage error by tracking the input voltage changes, allowing for fast transient response. The device also implements an adjustable reminder-voltage feature that sets the voltage of the output voltage at a fixed level when the input voltage is greater than the reminder voltage.The LM27213SQ is capable of operating at frequencies up to 2.4 MHz, with a frequency range of 200 KHz to 2.4 MHz. The device also includes a user-adjustable soft-start feature that allows for controlled start-up and ramp-up time of the output voltage. The device utilizes an adjustable clock pre-scaler to reduce the switching frequency and reduce e-MI noise and radiation. The pre-scaler is adjustable between 16/32/64/128. The clock pre-scaler also allows for optimal settings depending on the output load and input voltage.

Conclusion
The LM27213SQ is a fast-transitioning synchronous step-down DC-DC controller with a wide input voltage range that supports up to 28V input voltage. It is a highly efficient, highly integrated synchronous step-down DC-DC controller that does not require an external regulator. The LM27213SQ can be used in a wide variety of applications such as system voltage regulators and power management in notebook computers, digital cameras, PDAs and video gaming consoles. The device uses a pulse width modulation (PWM) regulation scheme that adjusts the duty cycle of the PWM signal to control the voltage of the output and operates in forced-PWM or constant-ON-time modes. The device also implements an adjustable reminder-voltage feature that sets the voltage of the output voltage at a fixed level when the input voltage is greater than the reminder voltage. The device utilizes an adjustable clock pre-scaler to reduce the switching frequency and reduce e-MI noise and radiation. The LM27213SQ is a highly capable, efficient, and easy-to-use DC-DC switching controller.

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