- 3.3V, 5V, 12V and adjustable output versions
- The output voltage range of the adjustable version, 1.2V to 37V± up to more than 4% of line and load conditions
- Guaranteed 1A output current
- Available in 7-pin TO-220 and TO-263 (surface mount) packages
- The input voltage range is up to 40V
- Excellent line and load regulation specifications
- 150 kHz fixed frequency internal oscillator
- Shutdown/soft start
- Error signs of regulation
- Error output delay
- Low power standby mode, 85μA typical for Iq
- High efficiency
- Use off-the-shelf standard inductors
- Thermal shutdown and current limit protection
illustrate
Voltage Regulators LM2598 Series Buck Switching Regulators (Buck) drive a monolithic IC with excellent line and load regulation 1A load capability, providing monolithic integrated circuits for all active functions. These devices are available in 3.3V, 5V, 12V, and adjustable output versions with fixed output voltages.
This series of switching regulators LM2595 is similar and adds additional regulatory and performance features.
Requiring a minimal number of external components, these regulators are simple to use and include internal frequency compensation †, improved line and load specifications, fixed frequency oscillators, shutdown/soft start, error flag delay, and error flag output.
The LM2598 series switches at 150 kHz, thus enabling smaller sizes with lower frequency switching regulators required filter components. The standard 7-pin TO-220 package differs from several options that result in bending, and the 7-lead TO-263 surface mount package. Typically, an output voltage of less than 12V and an ambient temperature of less than 50°C are required.
The standard inductor series (through-hole and surface mount types) can be produced from several different manufacturers optimized for the LM2598 series used. This feature greatly simplifies the design of switching power supplies.
Other features include a guaranteed 4% tolerance under all conditions under the input voltage and output load conditions of the ± output voltage, and a frequency of ± 15% for the oscillator. Includes external shutdown with a typical 85μA standby current. Self-protection features include a two-stage current limit, output switch, and complete protection in the event of an over-temperature shutdown fault.
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- Simple, high-efficiency step-down (buck-down) regulator
- Efficient pre-conditioning of linear regulators
- Switching regulator on the card
- Positive negative voltage converter
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