LTC1649CS

Frequency - Switching:	200kHz
Base Part Number:	LTC1649
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Current Limit, Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	93%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.7 V ~ 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:	Tube

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Introduction

The LTC1649CS is an integrated high voltage switching regulator power management IC from Linear Technology. It is typically used in applications requiring a high level of output voltage accuracy and efficiency, while providing protection features such as short-circuit protection and overvoltage protection. The LTC1649CS provides a small package size, low power consumption, tight regulation accuracy, and a wide temperature range operation.

Features

The LTC1649CS provides a number of features that are beneficial in many applications:

• Wide input voltage range of 2.3V to 20V
• Adjustable output voltage from 0 to 35V
• Internal switching frequency up to 2.5MHz
• Fully integrated ON/OFF control logic
• High efficiency current mode control
• Very low stand-by current of 750nA (typical)
• Short-circuit protection and overvoltage protection
• Thermal shutdown protection under over temperature conditions
• High-voltage push-pull power output stage

Applications

The LTC1649CS is suitable for use in a wide range of applications, including:

• High-voltage switched mode power supplies
• DC/DC converters from 2.5V to 35V
• Adaptive battery chargers
• High-efficiency step-up and step-down converters
• DC/DC LED drivers
• Isolated voltage-to-frequency converters
• Voltage-controlled crystal oscillators

Working Principle

The LTC1649CS is an integrated power management IC that provides an adjustable, high-efficiency and low noise switched-mode power supply. The device features a high voltage, push-pull power output stage, as well as a low-side two-level MOSFET driver and on/off control logic. The device implements a current mode control topology, which allows it to accurately control the output voltage while maintaining a high level of efficiency.The device is powered via the VCC pin, which provides the control logic power supply and the high-side MOSFET driver power supply. The VT pin can be used to adjust the output voltage, either by connecting it directly to the output voltage value or by connecting it to an external voltage reference. The EN pin is used for enabling or disabling the output stage; when the EN pin is set low, the output stage is disabled, allowing for low power consumption. The SS pin is used to adjust the maximum output voltage and to provide overvoltage protection. The SW pin is an open drain output used to control the external MOSFET switch. The LTC1649CS implements an adjustable hysteresis current mode PWM control to regulate the output voltage. A reference voltage (VREF) is generated based on the output voltage, and a comparator compares the error between the reference voltage and a feedback voltage. The compensation network connected to the COMP pin ensures the stability of the loop and sets the switching frequency. A circuit is used to limit the current to a safe level in order to protect the internal components under overload conditions, while a loop of temperature sensing diode provides a thermal shutdown in case the internal die temperature becomes too high.

Conclusion

The LTC1649CS is a high-power, switched-mode power supply management IC from Linear Technology that is suitable for a range of applications. It features a wide input voltage range, adjustable output voltage, internally generated reference voltage, adjustable hysteresis current mode PWM control, low power consumption, as well as protection against short-circuits, overvoltage, and high temperatures. With its integrated features, the LTC1649CS is a highly efficient and low noise solution for many applications.

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