LM2577SX-15/NOPB

Voltage - Output (Min/Fixed):	15V
Base Part Number:	LM2577
Supplier Device Package:	DDPAK/TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	52kHz
Current - Output:	3A (Switch)
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	3.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Boost, Flyback, Forward Converter
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Up/Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

LM2577SX-15/NOPB is an advanced current-mode step-up DC/DC switching regulator controller designed to obtain a maximum output current of 15A through the external power MOSFET. The LM2577SX-15/NOPB features an adjustable output voltage, up to 60V, an input voltage range up to 30V, and an incredibly small external component count. The LM2577SX-15/NOPB includes a high-side current sense amplifier, a continuous shortcircuit protection feature, a user-selectable soft-start feature, and PWM frequency sync feature for noise reduction.

Application field

The LM2577SX-15/NOPB is suitable for a wide range of applications, ranging from point-of-load (POL) power supplies, field-programmable gate array (FPGA) and graphics processing unit (GPU) power supplies, telecom, automotive, and consumer electronics. The LM2577SX-15/NOPB also offers a wide range of current-mode pulse-width modulation (PWM) control capabilities, ensuring low stress on the external power MOSFET and excellent transient and steady-state regulation performance.

Features

The LM2577SX-15/NOPB offers the following features:

• Voltage adjustable output from 1.5V to 60V
• Input voltage range from 4.5V to 30V
• Current-mode pulse-width modulation (PWM) operation
• Run/stop/softstart control for load regulation
• Automatic skip mode for light load conditions
• Internal high side Current Sense (HSCS) amplifier
• Continuous short-circuit protection
• PWM frequency synchronization capability
• Supports reduced component microcontroller applications
• High efficiency with minimum parts count

Working principle

The LM2577SX-15/NOPB utilizes a fixed frequency, current-mode PWM controller architecture. The task of the controller is to control the switch temperature, peak switch current, and output voltage in order to maintain the desired regulation performance. With the small size and the low component count, the LM2577SX-15/NOPB simplifies the design of POL, FPGA, and GPU power supplies.The LM2577SX-15/NOPB includes an internal high-side current sense amplifier to enable flexible output current regulation. This can be regulated to a maximum of 15A. The current sense amplifier senses the voltage drop across the external sense resistor and derives the load current. This current can then be used to control the peak switch current limit.The automatic skip mode feature in the LM2577SX-15/NOPB is utilized to minimize the power losses in light load conditions. The load on the controller is reduced by skipping some of the PWM output pulses. This allows the power MOSFET to stay off for extended periods of time, keeping the power losses due to the conduction of the MOSFET to a minimum.The LM2577SX-15/NOPB also includes an adjustable soft-start feature. This feature can be used to reduce the inrush current seen at the start-up of the system by ramping up the output voltage over time. This feature can also be used to reduce the output voltage to zero before shutting down the system.

Conclusion

The LM2577SX-15/NOPB is an advanced current-mode step-up DC/DC switching regulator controller. It offers a wide range of features allowing for a wide range of applications. It includes a high-side current sense amplifier, a continuous short-circuit protection feature, a user-selectable soft-start feature, and PWM frequency sync feature for noise reduction. The LM2577SX-15/NOPB simplifies the design of POL, FPGA, and GPU power supplies and can help reduce overall system costs. The LM2577SX-15/NOPB is a dependable, cost-effective choice for a wide variety of power supplies.

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