LM2577 SIMPLE SWITCHER® 3.5V to 40V, 3A Low Component Count Step-Up Regulator | TI.com

LM2577 (ACTIVE) SIMPLE SWITCHER® 3.5V to 40V, 3A Low Component Count Step-Up Regulator

 

Recommended alternative parts

  • TPS55340  -  Integrated, 5-A 40-V Wide Input Range Boost/SEPIC/Flyback DC-DC Regulator

Description

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.

Features

  • Requires Few External Components
  • NPN Output Switches 3.0A, can Stand off 65V
  • Wide Input Voltage Range: 3.5V to 40V
  • Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit
  • 52 kHz Internal Oscillator
  • Soft-start Function Reduces In-rush Current During Start-up
  • Output Switch Protected by Current Limit, Under-voltage Lockout, and Thermal Shutdown

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Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switch current limit (Typ) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Duty cycle (Max) (%) Operating temperature range (C) Type Rating Package Group
LM2577 Order now 3.5     40     1.23     15     3     1     52     52     10    
   		 95     -40 to 125     Converter     Catalog     DDPAK/TO-263 | 5
TO-220 | 5    
LM2585 Order now 4     40     1.23     60     4     1     85     115     11    
   		 98     -40 to 125     Converter     Catalog     DDPAK/TO-263 | 5
TO-220 | 5    
LM2586 Order now 4     40     1.23     60     4     1     75     125     11     Enable
Frequency Synchronization    		 98     -40 to 125     Converter     Catalog     DDPAK/TO-263 | 7
TO-220 | 7    
LM2587 Order now 4     40     1.23     60     6.5     1     85     115     11    
   		 98     -40 to 125     Converter     Catalog     DDPAK/TO-263 | 5
TO-220 | 5