Overview
The MC78M05BDT is a 500 mA positive voltage regulator from onsemi, part of the MC78M00/MC78M00A series. This device is similar to the popular MC7800 series but is specified for half the output current. It is designed for local, on-card voltage regulation and features internal current limiting, thermal shutdown circuitry, and safe-area compensation for the internal pass transistor, making it robust under various operating conditions.
Key Specifications
| Characteristic | Symbol | Min | Max | Unit | |
|---|---|---|---|---|---|
| Output Voltage (TJ = 25°C) | VO | 4.8 | 5.0 | 5.2 | Vdc |
| Output Voltage Variation (7.0 Vdc ≤ VI ≤ 20 Vdc, 5.0 mA ≤ IO ≤ 350 mA) | VO | 4.8 | - | 5.2 | Vdc |
| Input Voltage | VI | 7.0 | - | 20 | Vdc |
| Maximum Output Current | IO | - | - | 500 | mA |
| Power Dissipation (Package Limitation) | PD | Internally Limited | - | - | - |
| Thermal Resistance, Junction-to-Air | �JA | - | 92 | - | °C/W |
| Operating Junction Temperature Range | TJ | -40 | - | +125 | °C |
| Storage Temperature Range | Tstg | -65 | - | +150 | °C |
| Dropout Voltage (TJ = 25°C) | VI−VO | - | 2.0 | - | Vdc |
| Short Circuit Current Limit (TJ = 25°C, VI = 35 V) | IOS | - | 350 | - | mA |
| Average Temperature Coefficient of Output Voltage (IO = 5.0 mA) | �VO/�T | - | ±0.2 | - | mV/°C |
Key Features
- No External Components Required
- Internal Thermal Overload Protection
- Internal Short Circuit Current Limiting
- Output Transistor Safe-Area Compensation
- High Accuracy (±2%) for MC78M00A models
- Available for various output voltages: 5.0 V, 8.0 V, 12 V, and 15 V
- NCV prefix available for automotive and other applications requiring enhanced reliability
Applications
The MC78M05BDT is suitable for a variety of applications requiring stable and regulated voltage, including:
- Local, on-card voltage regulation in electronic devices
- Automotive systems (with NCV prefix)
- Industrial control systems
- Consumer electronics
- Medical devices
Q & A
- What is the maximum output current of the MC78M05BDT?
The maximum output current is 500 mA with adequate heatsinking.
- What are the key protection features of the MC78M05BDT?
The device features internal thermal overload protection, internal short circuit current limiting, and output transistor safe-area compensation.
- What is the typical dropout voltage for the MC78M05BDT?
The typical dropout voltage is 2.0 Vdc at TJ = 25°C.
- What is the operating junction temperature range for the MC78M05BDT?
The operating junction temperature range is -40°C to +125°C.
- Does the MC78M05BDT require external components for operation?
No, the MC78M05BDT does not require external components for operation.
- What is the average temperature coefficient of output voltage for the MC78M05BDT?
The average temperature coefficient of output voltage is ±0.2 mV/°C at IO = 5.0 mA.
- What are the available output voltages for the MC78M00 series?
The available output voltages are 5.0 V, 8.0 V, 12 V, and 15 V.
- What is the ripple rejection for the MC78M05BDT?
The ripple rejection is typically around 56 dB at IO = 100 mA and f = 120 Hz.
- Is the MC78M05BDT suitable for automotive applications?
Yes, with the NCV prefix, it is suitable for automotive and other applications requiring enhanced reliability.
- What is the short circuit current limit for the MC78M05BDT?
The short circuit current limit is 350 mA at TJ = 25°C and VI = 35 V.
