Overview
The LM2594M-ADJ/NAK2, produced by National Semiconductor (now part of Texas Instruments), is a SIMPLE SWITCHER® power converter that serves as a high-efficiency step-down (buck) switching regulator. This device is designed to be easy to use and requires a minimal number of external components. It is capable of delivering up to 0.5-A DC load current with excellent line and load regulation. The LM2594M-ADJ/NAK2 is available in an adjustable output version, allowing for a wide range of output voltages to be set using external resistors.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage (LM2594) | 4.5 | - | 40 | V |
| Supply Voltage (LM2594HV) | 4.5 | - | 60 | V |
| Output Voltage (Adjustable) | 1.23 | Programmable | 37 | V |
| Output Current | - | - | 0.5 | A |
| Oscillator Frequency | 110 | 150 | 173 | kHz |
| Efficiency | - | 80% | - | % |
| Quiescent Current | - | 5-10 | - | mA |
| Standby Quiescent Current | - | 85 | - | μA |
| Maximum Junction Temperature | - | - | 150 | °C |
Key Features
- High efficiency with up to 80% efficiency at full load.
- Wide input voltage range: 4.5 V to 40 V (LM2594) or 60 V (LM2594HV).
- Adjustable output voltage version allows for a wide range of output voltages.
- Internal frequency compensation and fixed-frequency oscillator.
- Excellent line and load regulation.
- Thermal shutdown and current-limit protection for self-protection.
- Low quiescent current: typically 5-10 mA.
- Standby quiescent current: typically 85 μA.
- External shutdown feature.
- Simple to use with minimal external components required.
Applications
- Simple high-efficiency step-down (buck) regulator.
- Efficient preregulator for linear regulators.
- On-card switching regulators.
- Positive-to-negative converters.
- General-purpose power supplies in various electronic devices.
Q & A
- What is the maximum input voltage for the LM2594 and LM2594HV?
The LM2594 has a maximum input voltage of 40 V, while the LM2594HV can handle up to 60 V.
- What is the maximum output current of the LM2594M-ADJ/NAK2?
The maximum output current is 0.5 A.
- What is the typical efficiency of the LM2594M-ADJ/NAK2?
The typical efficiency is up to 80% at full load.
- What is the oscillator frequency of the LM2594M-ADJ/NAK2?
The oscillator frequency is typically 150 kHz, ranging from 110 kHz to 173 kHz.
- Does the LM2594M-ADJ/NAK2 have thermal protection?
- What is the quiescent current of the LM2594M-ADJ/NAK2?
The quiescent current is typically 5-10 mA.
- Can the output voltage of the LM2594M-ADJ/NAK2 be adjusted?
- What is the standby quiescent current of the LM2594M-ADJ/NAK2?
The standby quiescent current is typically 85 μA.
- Does the LM2594M-ADJ/NAK2 require many external components?
- What are some common applications of the LM2594M-ADJ/NAK2?
