LM2657MTC

Frequency - Switching:	200kHz ~ 500kHz
Base Part Number:	LM2657
Supplier Device Package:	28-TSSOP
Package / Case:	28-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):	70%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 28 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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The LM2657MTC is an advanced synchronous buck switching controller for generating a regulated output voltage from a DC input voltage, and is often found in a wide range of applications such as telecom, computer, instrumentation and automotive electronics. It is part of the Voltage Regulators DC DC Switching Controllers family of products offered by Texas Instruments.This particular voltage regulator was designed for extreme reliability and accuracy by using a BiCMOS process that provides high integration and minimal power consumption, while allowing it to operate over a wide temperature ranges. The device features a wide 8V to 35 V input voltage range and 2.5V to 24 V output, making it ideal for applications that require a broad range of input and output voltages.To achieve its voltage regulation functions, the LM2657MTC employs a synchronous buck topology that uses active transistors between its input and output, allowing it to achieve high current and power demands. The device consists of a high frequency current mode pulse width modulator (PWM) and a low on resistance power metal-oxide semiconductor (MOSFET) switch that allows for high efficiency, low output noise and excellent line and load regulation.The device also includes on-chip protection features such as frequency foldback and over-temperature protection circuitry. This ensures the device will operate safe and reliable even under extreme conditions. The device also includes adjustable soft-start and input over-voltage protection, making it suitable for many applications.The LM2657MTC is easily configured thanks to its comprehensive set of analog and digital control ports, allowing for maximum flexibility. These include an input voltage sense port, a soft start port, an output voltage sense port as well as an external voltage sensing gain port and output voltage offset pin. The device also features a circuit reset pin to ensure maximum system performance and is designed to operate in tandem with many popular external components such as ceramic capacitors, MOSFETs and bootstrapping diodes.In summary, the LM2657MTC is a highly reliable and flexible voltage regulator suitable for a wide range of applications such as telecom, computer, instrumentation and automotive electronics. Its wide input and output voltage ranges as well as a comprehensive set of control ports make it easy to configure and set up, while its BiCMOS process ensures extreme reliability and accuracy. Thanks to its high frequency current mode PWM and low on resistance switch circuits, the device delivers excellent line and load regulation with low output noise and high efficiency. With a frequency foldback and over-temperature protection circuitry onboard, the device is well-protected against unexpected conditions.

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