| Vin (Min) (V) | 4.5 |
| Vin (Max) (V) | 40 |
| Vout (Min) (V) | 3.3 |
| Vout (Max) (V) | 37 |
| Iout (Max) (A) | 3 |
| Iq (Typ) (uA) | 5000 |
| Switching frequency (Min) (kHz) | 110 |
| Switching frequency (Max) (kHz) | 173 |
| Features | Over Current Protection, Power Good |
| Rating | Catalog |
| Regulated outputs (#) | 1 |
| Control mode | Voltage Mode |
| Duty cycle (Max) (%) | 100 |
- 3.3-V, 5-V, 12-V, and Adjustable Output Versions
- Adjustable Version Output Voltage Range: 1.2 V
to 37 V ±4% Maximum Over Line and Load
Conditions - 3-A Output Current
- Available in 7-Pin TO-220 and TO-263 (Surface-
Mount) Package - Input Voltage Range Up to 40 V
- 150-kHz Fixed-Frequency Internal Oscillator
- Shutdown and Soft-Start
- Out-of-Regulation Error Flag
- Error Output Delay
- Low Power Standby Mode, IQ, Typically 80μA
- High Efficiency
- Uses Readily Available Standard Inductors
- Thermal Shutdown and Current-Limit Protection
The LM2599 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.
The LM2598 is a member of the LM259x family, with additional supervisory and performance features added.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown and Soft-start, error flag delay, and error flag output.
The LM2599 series 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 7-pin TO-220 package with several different lead bend options, and a 7-pin TO-263 surface-mount package.
A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2599 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a ±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 80-μA standby current. Self-protection features include a two stage current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions.
