LT1765EFE-5#PBF

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LT1765
Supplier Device Package:	16-TSSOP-EP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	1.25MHz
Current - Output:	3A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	25V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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The LT1765EFE-5#PBF is a micropower DC/DC step-up switching regulator that provides high-efficiency conversion. With up to 3.2 A of output current, the LT1765EFE-5#PBF is suitable for applications with a wide range of input voltages, including automotive and industrial systems with their transient environments. The LT1765EFE-5#PBF also includes a regulated LOOPTHRU output that can be used as an additional converter or to supply a remote load.ApplicationsThe LT1765EFE-5#PBF is suitable for a variety of automotive and industrial systems such as:* Automotive battery-operated applications.* Over-voltage protection systems.* Step-up converters for 5 V and other low-voltage circuits.* Backup and UPS systems for industrial environments.Features The LT1765EFE-5#PBF offers a unique feature set making it ideal for a wide range of applications. * Adjustable switching frequency up to 3 MHz. * Output current up to 3.2 A.* 140 mV typical (and 200 mV maximum) input voltage ripple rejection at 1 MHz.* Up to 85 % efficiency.* Output voltage range adjustable from 2.5 V to 16 V.* Reverse current protection. * Fixed 4.5 V to 32 V wide input voltage range. * Over-temperature, over-current and short-circuit protection. * Maximum conversion frequency up to 1.2 MHz. * Internal Soft-Start for smooth power-up.Working PrincipleThe LT1765EFE-5#PBF is designed to efficiently generate a higher output voltage from a lower input voltage. Its internal oscillator produces pulse-width modulated (PWM) signals that drive two power transistors in series. The two power transistors are connected to the input voltage VIN, while the output is fed back and connected to the PWM comparator.The advantage of the pulse-width modulation is that it allows a constant output voltage even when VIN and VOUT differ. The output voltage is set by means of an external resistor divider as the reference voltage. The PWM controller compares the output voltage and the reference voltage, adjusting the duty cycle of the output PWM signal.The power transistors drive the output voltage with a voltage gain depending on the duty cycle of the PWM signal, the input voltage and the turn-on resistance of the power transistors.ConclusionThe LT1765EFE-5#PBF is a high-efficiency micropower step-up DC/DC switching regulator ideal for a variety of applications in industrial and automotive systems. Its features include adjustable switching frequency up to 3 MHz, output current up to 3.2 A, 140 mV typical input voltage ripple rejection at 1 MHz, up to 85 % efficiency, adjustable output voltage range from 2.5 V to 16 V, reverse current protection, wide input voltage range from 4.5 V to 32 V, and over-temperature, over-current and short-circuit protection. The LT1765EFE-5#PBF utilizes pulse-width modulation which allows a constant output voltage even when VIN and VOUT differ.

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