Overview
The LM2594MX-3.3/NOPB is a monolithic integrated circuit from Texas Instruments, designed as a step-down (buck) switching regulator. This device is part of the LM2594 series and is specifically configured to provide a fixed output voltage of 3.3V. It is capable of delivering up to 0.5-A DC load current with excellent line and load regulation. The LM2594MX-3.3/NOPB is available in an 8-pin SOIC package and requires a minimum number of external components, making it simple to use and integrate into various power supply designs.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 4.5 V | - | 40 V | V |
| Output Voltage | 3.23 V | 3.3 V | 3.37 V | V |
| Output Current | - | - | 0.5 A | A |
| Oscillator Frequency | 110 kHz | 150 kHz | 173 kHz | kHz |
| Saturation Voltage | 0.9 V | 1.1 V | 1.2 V | V |
| Current Limit | 0.65 A | 0.8 A | 1.3 A | A |
| Quiescent Current | 5 mA | 10 mA | - | mA |
| Standby Quiescent Current | 85 μA | - | - | μA |
| Maximum Junction Temperature | - | - | 150 °C | °C |
| Package Type | - | - | 8-pin SOIC | - |
Key Features
- High efficiency with up to 80% efficiency at full load.
- Fixed output voltage of 3.3V, with other versions available for 5V, 12V, and adjustable output.
- Wide input voltage range from 4.5V to 40V (up to 60V for the LM2594HV version).
- Internal frequency compensation and fixed-frequency oscillator.
- Thermal shutdown and current-limit protection for self-protection.
- External shutdown feature with typically 85-μA standby current.
- Uses readily available standard inductors, simplifying the design of switch-mode power supplies.
- Ensured ±4% tolerance on output voltage under all conditions of input voltage and output load.
Applications
- Simple high-efficiency step-down (buck) regulators.
- Efficient pre-regulators for linear regulators.
- On-card switching regulators.
- Positive-to-negative converters.
- General power supply designs requiring a stable and efficient DC output.
Q & A
- What is the maximum output current of the LM2594MX-3.3/NOPB?
The maximum output current is 0.5 A.
- What is the fixed output voltage of the LM2594MX-3.3/NOPB?
The fixed output voltage is 3.3 V.
- What is the input voltage range for the LM2594MX-3.3/NOPB?
The input voltage range is from 4.5 V to 40 V.
- What type of package is the LM2594MX-3.3/NOPB available in?
The device is available in an 8-pin SOIC package.
- Does the LM2594MX-3.3/NOPB have thermal protection features?
- Can the LM2594MX-3.3/NOPB be used as a pre-regulator for linear regulators?
- What is the typical quiescent current of the LM2594MX-3.3/NOPB?
The typical quiescent current is 10 mA.
- What is the standby quiescent current when the regulator is in the OFF state?
The standby quiescent current is typically 85 μA.
- Does the LM2594MX-3.3/NOPB require many external components?
No, it requires a minimum number of external components, making it simple to use.
- What is the maximum junction temperature for the LM2594MX-3.3/NOPB?
The maximum junction temperature is 150 °C.
