Specification	LM2577S-ADJ/NOPB

Current - Output	3 A
Frequency - Switching	52 kHz
Function	Step-Up, Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	125 ¯C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive or Negative
Output Type	Adjustable
Package / Case	TO-263-6, TO-263BA, D2PAK (5 Leads + Tab)
Supplier Device Package	TO-263 (DDPAK-5)
Synchronous Rectifier	False
Topology	Flyback, Boost, Forward Converter
Voltage - Input (Min) [Min]	3.5 V
Voltage - Output (Max)	60 V
Voltage - Output (Min/Fixed)	1.23 V

LM2577 Series

Part	Function	Output Type	Mounting Type	Current - Output	Number of Outputs	Output Configuration	Voltage - Output (Max)	Topology	Supplier Device Package	Frequency - Switching	Voltage - Output (Min/Fixed)	Package / Case [custom]	Package / Case	Package / Case [custom]	Voltage - Input (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Output Type	Package / Case	Package / Case
Texas Instruments LM2577M-ADJ	Step-Up Step-Up/Step-Down	Adjustable	Surface Mount	3 A	1	Positive or Negative	60 V	Boost Flyback Forward Converter	24-SOIC	52 kHz	1.23 V	7.5 mm	24-SOIC	0.295 in	3.5 V	-40 °C	125 ¯C
Texas Instruments LM2577T-ADJ/LF02	Step-Up Step-Up/Step-Down	Adjustable	Through Hole	3 A	1	Positive	60 V	Boost Flyback Forward Converter	TO-220-5	52 kHz	1.23 V		TO-220-5 Formed Leads		3.5 V	-40 °C	125 ¯C
Texas Instruments LM2577T-ADJ/LB02	Step-Up Step-Up/Step-Down	Adjustable	Through Hole	3 A	1	Positive	60 V	Boost Flyback Forward Converter	TO-220-5	52 kHz	1.23 V		TO-220-5 Formed Leads		3.5 V	-40 °C	125 ¯C
Texas Instruments LM2577S-ADJ/NOPB	Step-Up Step-Up/Step-Down	Adjustable	Surface Mount	3 A	1	Positive or Negative	60 V	Boost Flyback Forward Converter	TO-263 (DDPAK-5)	52 kHz	1.23 V		D2PAK (5 Leads + Tab) TO-263-6 TO-263BA		3.5 V	-40 °C	125 ¯C
Texas Instruments LM2577T-12/LF03	Step-Up Step-Up/Step-Down		Through Hole	3 A	1	Positive		Boost Flyback Forward Converter	TO-220-5	52 kHz	12 V		TO-220-5 Formed Leads		3.5 V	-40 °C	125 ¯C	1.81 mOhm
Texas Instruments LM2577T-ADJ/LB03	Step-Up Step-Up/Step-Down	Adjustable	Through Hole	3 A	1	Positive	60 V	Boost Flyback Forward Converter	TO-220-5	52 kHz	1.23 V		TO-220-5 Formed Leads		3.5 V	-40 °C	125 ¯C
Texas Instruments LM2577S-12	Step-Up Step-Up/Step-Down		Surface Mount	3 A	1	Positive or Negative		Boost Flyback Forward Converter	TO-263 (DDPAK-5)	52 kHz	12 V		D2PAK (5 Leads + Tab) TO-263-6 TO-263BA		3.5 V	-40 °C	125 ¯C	1.81 mOhm
Texas Instruments LM2577N-15/NOPB	Step-Up Step-Up/Step-Down		Through Hole	3 A	1	Positive or Negative		Boost Flyback Forward Converter	16-PDIP	52 kHz	15 V		16-DIP		3.5 V	-40 °C	125 ¯C	1.81 mOhm	0.3 in	7.62 mm
Texas Instruments LM2577T-15/LF03	Step-Up Step-Up/Step-Down		Through Hole	3 A	1	Positive		Boost Flyback Forward Converter	TO-220-5	52 kHz	15 V		TO-220-5 Formed Leads		3.5 V	-40 °C	125 ¯C	1.81 mOhm
Texas Instruments LM2577N-12/NOPB	Step-Up Step-Up/Step-Down		Through Hole	3 A	1	Positive or Negative		Boost Flyback Forward Converter	16-PDIP	52 kHz	12 V		16-DIP		3.5 V	-40 °C	125 ¯C	1.81 mOhm	0.3 in	7.62 mm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 9.12
		10	$ 8.24
		45	$ 7.85
		135	$ 6.82
		270	$ 6.51
		540	$ 5.94
		1035	$ 5.17
Newark	Each	1	$ 9.07
		10	$ 7.04
		25	$ 6.66
		90	$ 6.27
		135	$ 6.08
		270	$ 5.89
		540	$ 5.70
Texas Instruments	TUBE	1	$ 6.98
		100	$ 5.69
		250	$ 4.47
		1000	$ 3.79

Description

General part information

LM2577 Series

The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and flyback transformers designed to work with these switching regulators.

Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and undervoltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients.

Documents

Technical documentation and resources

LM2577S-ADJ/NOPB

Deep-Dive with AI

LM2577S-ADJ/NOPB

Deep-Dive with AI

Technical Specifications

LM2577 Series

Pricing

Description

LM2577 Series

Documents

Datasheet

Switching regulator fundamentals (Rev. C)

AN-643 EMI/RFI Board Design (Rev. B)

AN-776 20-W SIMPLE SWITCHER Forward Converter (Rev. A)

Negative Buck Switching Regulator (using LM258x)

AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C)

Understanding Boost Power Stages In Switchmode Power Supplies

AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C)

AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)

AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)

Semiconductor and IC Package Thermal Metrics (Rev. D)

AN-777 LM2577 Three Output, Isolated Flyback Regulator (Rev. B)

AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B)

AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)

AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)

LM1577/LM2577 SIMPLE SWITCHER Step-Up Voltage Regulator datasheet (Rev. D)

Working With Boost Converters

스트컨버터의 전력계 기본 계산 (Rev. D)

Input and Output Capacitor Selection

Basic Calculation of a Boost Converter's Power Stage (Rev. D)

LM2577 Series