Overview
The L78M05CP is a precision 500 mA three-terminal positive voltage regulator from STMicroelectronics. This component is part of the L78M series, which is designed to provide local on-card regulation, eliminating the distribution problems associated with single point regulation. The L78M05CP is available in various packages, including TO-220, TO-220FP, DPAK, and IPAK, making it versatile for different application needs.
The device is primarily used as a fixed voltage regulator but can also be configured with external components to achieve adjustable voltage and current outputs. It features internal current limiting, thermal shutdown, and safe area protection, making it essentially indestructible if adequate heat sinking is provided.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 4.8 | 5 | 5.2 | V |
| Output Current (IO) | - | - | 500 | mA |
| Input Voltage (VI) | - | - | 35 (for VO = 5 to 18 V), 40 (for VO = 20, 24 V) | V |
| Line Regulation (∆VO) | - | - | 100 mV | - |
| Load Regulation (∆VO) | - | - | 120 mV | - |
| Quiescent Current (Id) | - | 6 | - | mA |
| Dropout Voltage (Vd) | - | - | 2 | V |
| Short Circuit Current (Isc) | - | - | 300 | mA |
| Operating Junction Temperature (TJ) | -40 | - | 125 | °C |
| Thermal Resistance Junction-Case (RthJC) | - | - | 5 (TO-220, TO-220FP), 8 (DPAK, IPAK) | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | - | - | 50 (TO-220), 60 (TO-220FP), 100 (DPAK, IPAK) | °C/W |
Key Features
- Output current up to 500 mA
- Fixed output voltages: 5 V (L78M05CP)
- Internal current limiting and thermal shutdown
- Short circuit protection and output transition SOA protection
- Output voltage tolerance: 2% (AB and AC versions), 4% (C version)
- Guaranteed in extended temperature range: -40 to 125 °C (AB), 0 to 125 °C (AC)
- Available in TO-220, TO-220FP, DPAK, and IPAK packages
- Low dropout voltage: 2 V
- High ripple rejection: up to 59 dB
- Low output noise voltage: 45 µV (10 Hz to 100 kHz)
Applications
- Local on-card regulation in various electronic devices
- Power supplies for industrial, automotive, and consumer electronics
- Regulation in battery-powered devices
- Use in medical equipment and other sensitive applications requiring stable voltage
- Adjustable voltage and current regulation with external components
Q & A
- What is the maximum output current of the L78M05CP?
The maximum output current is 500 mA.
- What are the available output voltages for the L78M series?
The L78M series offers fixed output voltages of 5, 6, 8, 9, 10, 12, 15, and 24 V.
- What is the dropout voltage of the L78M05CP?
The dropout voltage is 2 V.
- Does the L78M05CP have thermal protection?
- What are the available packages for the L78M05CP?
The device is available in TO-220, TO-220FP, DPAK, and IPAK packages.
- What is the operating junction temperature range for the L78M05CP?
The operating junction temperature range is -40 to 125 °C (AB version) and 0 to 125 °C (AC version).
- How much ripple rejection does the L78M05CP provide?
The ripple rejection is up to 59 dB.
- What is the quiescent current of the L78M05CP?
The quiescent current is 6 mA.
- Can the L78M05CP be used for adjustable voltage regulation?
- What is the short circuit current limit of the L78M05CP?
The short circuit current limit is 300 mA.
