LT1611CS5#TRMPBF

Voltage - Output (Min/Fixed):	-0.9V
Base Part Number:	LT1611
Supplier Device Package:	SOT-23-5
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	1.4MHz
Current - Output:	550mA (Switch)
Voltage - Output (Max):	-10V (Switch)
Series:	--
Voltage - Input (Max):	10V
Voltage - Input (Min):	0.9V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost, Charge Pump, Cuk
Output Configuration:	Negative
Function:	Step-Up, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Introduction

LT1611CS5#TRMPBF is a three-terminal, 4A Constant Frequency, Current Mode, and Step-Down DC-DC Switching Regulator, belonging to PMIC - Voltage Regulators - DC DC Switching Regulators category. It is designed to take a wide input voltage range of 4.5V to 30V and provide an adjustable output voltage as low as 0.5V with guaranteed peak current capability up to 4A. Using a proprietary CMOS current mode architecture, it is able to maintain a very low duty cycle, so that the high efficiency can be achieved even with the small inductor and ceramic output capacitor. This device is capable of switching at high frequency that can operate either at a fixed frequency of 200kHz, 1MHz or 2MHz, or an external signal frequency up to 5MHz.

Features

The LT1611CS5#TRMPBF offers many features that make it a viable solution for applications such as buck converters, battery chargers, motor drivers, and high current power supplies. The chief operating features include:* Output voltage adjustable from 0.5V to the input voltage, * Low quiescent current of 150 μA * Low external component count * External shutdown * Internal soft start * Under-voltage lockout* Oscillator synchronization* Cycle-by-cycle current limit * Thermal shutdown protection

Application Field

The high switching frequency and device architecture of the LT1611CS5#TRMPBF makes it especially suitable for buck converters in portable, high current battery powered applications. Primary applications of this device include battery chargers, motor drivers, automotive HVAC systems, and variable power supplies.

Working Principles

The LT1611CS5#TRMPBF utilizes a Constant Frequency, Current Mode architecture. The device consists of an oscillator, a voltage error amplifier, a driver, a high-side switch, a low-side switch, and various protection circuitries.The voltage error amplifier is composed of an operational amplifier and an internal reference voltage. The voltage across the output capacitor is monitored by the operational amplifier, which drives the converter to reach the target output voltage by invoking control pulses. This switch control logic is an internal, proportional-integral (PI) circuit that provides output voltage regulation by scaling the peak current to the sense resistor.The internal oscillator frequency is adjusted by an external resistor and it ranges from 200 kHz to 5MHz, depending on the parameters of the resistor. A higher frequency can reduce the inductor size and the output capacitor size, but at the cost of poorer efficiency and higher noise. The operating frequency is also synchronized to an external clock signal.The high-side power MOSFET switch is switched on and off in accordance to the rising and falling edges of the control pulses, while the low-side power MOSFET switch is kept in the conducting state for the entire cycle, so that a continuous current can flow through the inductor and deliver the regulated output voltage.

Benefits

The LT1611CS5#TRMPBF provides extensive protection features to ensure the safe operations. It has an adjustable input under-voltage lockout (UVLO) to protect the converter from running at low input voltage. Also, it has a programmable cycle-by-cycle current limit and thermal shutdown to make sure the load current and temperature are always within the desirable ranges.By implementing this device, system designers can expect better efficiency and increased power density, as well as immunity to both line and load transients. This helps ensure that the power in the conducted system is reliable and robust, even in the presence of input or output disturbances.

Conclusion

The LT1611CS5#TRMPBF is a highly featured, three-terminal constant frequency, current mode, and step-down DC-DC switching regulator that is well suited for the high current buck converter applications. This device is able to take a wide input voltage range of 4.5V to 30V and provide an adjustable output voltage as low as 0.5V with guaranteed peak current capability up to 4A. The LT1611CS5#TRMPBF utilizes a Constant Frequency, Current Mode architecture, with external switching frequency of up to 5MHz to achieve increased efficiency and increased power density. It also has a plethora of safety features such as adjustable input under-voltage lockout, programmable cycle-by-cycle current limit, and thermal shutdown.

The specific data is subject to PDF, and the above content is for reference

Part Number	Manufacturer	Price	Quantity	Description