| Vin (Min) (V) | 3.5 |
| Vin (Max) (V) | 40 |
| Vout (Min) (V) | 1.23 |
| Vout (Max) (V) | 15 |
| Switch current limit (Typ) (A) | 3 |
| Regulated outputs (#) | 1 |
| Switching frequency (Min) (kHz) | 52 |
| Switching frequency (Max) (kHz) | 52 |
| Iq (Typ) (mA) | 10 |
| Features | UVLO Fixed |
| Duty cycle (Max) (%) | 95 |
| Rating | Catalog |
- 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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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.
