Overview
The LM2594DADJR2G is a step-down switching regulator (buck converter) produced by onsemi. This monolithic integrated circuit is designed for easy and convenient implementation of a step-down switching regulator, capable of driving a 0.5 A load with excellent line and load regulation. The LM2594 operates at a fixed switching frequency of 150 kHz, allowing for smaller filter components compared to lower frequency regulators. It is available in an 8-lead Surface Mount package and is internally compensated to minimize the number of external components needed for power supply design.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | - | 40 | V |
| Output Voltage Range | 1.23 | - | 37 | V |
| Output Load Current | - | - | 0.5 | A |
| Switching Frequency | 135 | 150 | 165 | kHz |
| Saturation Voltage (Vsat) | 1.0 | 1.2 | 1.4 | V |
| Thermal Shutdown Temperature | - | - | 150 | °C |
| Standby Quiescent Current | 50 | - | 200 | µA |
| Maximum Junction Temperature | - | - | 150 | °C |
Key Features
- Adjustable Output Voltage Range: 1.23 V to 37 V
- Guaranteed 0.5 A Output Load Current
- Wide Input Voltage Range up to 40 V
- 150 kHz Fixed Frequency Internal Oscillator
- TTL Shutdown Capability
- Low Power Standby Mode, typical 50 µA
- Thermal Shutdown and Current Limit Protection
- Internal Loop Compensation
- Moisture Sensitivity Level (MSL) Equals 1
- Pb-Free Package
Applications
- Simple High-Efficiency Step-Down (Buck) Regulator
- Efficient Pre-Regulator for Linear Regulators
- On-Card Switching Regulators
- Positive to Negative Converter (Buck-Boost)
- Negative Step-Up Converters
- Power Supply for Battery Chargers
Q & A
- What is the maximum input voltage for the LM2594?
The maximum input voltage for the LM2594 is 40 V.
- What is the adjustable output voltage range of the LM2594?
The adjustable output voltage range is from 1.23 V to 37 V.
- What is the typical switching frequency of the LM2594?
The typical switching frequency is 150 kHz.
- How much current can the LM2594 handle in standby mode?
In standby mode, the quiescent current is typically 50 µA.
- What kind of protection features does the LM2594 have?
The LM2594 includes thermal shutdown and current limit protection.
- What is the maximum junction temperature for the LM2594?
The maximum junction temperature is 150°C.
- How do you program the output voltage for the LM2594?
The output voltage can be programmed using external resistors R1 and R2 according to the formula: Vout = Vref * (1 + R2/R1), where Vref = 1.23 V.
- What type of package is the LM2594 available in?
The LM2594 is available in an 8-lead Surface Mount package.
- Is the LM2594 Pb-Free?
- What is the recommended input capacitor for stable operation?
A low ESR aluminium or tantalum electrolytic capacitor, such as a 68 µF, 50 V capacitor, is recommended for stable operation.
