| Vin (Min) (V) | 4.5 |
| Vin (Max) (V) | 60 |
| Vout (Min) (V) | 3.3 |
| Vout (Max) (V) | 57 |
| Iout (Max) (A) | 1 |
| Iq (Typ) (uA) | 1000 |
| Switching frequency (Min) (kHz) | 110 |
| Switching frequency (Max) (kHz) | 173 |
| Features | Enable, Over Current Protection |
| Rating | Catalog |
| Regulated outputs (#) | 1 |
| Control mode | Voltage Mode |
| Duty cycle (Max) (%) | 100 |
- 3.3-V, 5-V, and Adjustable Output Versions
- Adjustable Version Output Voltage Range: 1.2 V
to 57 V ±4% Maximum Over Line and Load
Conditions - Specified 1-A Output Load Current
- Available in 5-Pin Package
- Input Voltage Range Up to 60 V
- 150-kHz Fixed Frequency Internal Oscillator
- ON and OFF Control
- Low Power Standby Mode, IQ Typically 90μA
- High Efficiency
- Thermal Shutdown and Current-Limit Protection
The LM2591HV series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, and an adjustable output version.
This series of switching regulators is similar to the LM2590HV, but without some of the supervisory and control features of the latter.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, and a fixed-frequency oscillator.
The LM2591HV operates at a switching frequency of 150 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-pin package with several different lead bend options, and a 5-pin surface mount package.
Other features include a specified ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 90-μA standby current. Self-protection features include a two stage current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.
