LT1084
#LT1084
#linear regulator
#high efficiency
#low dropout
#5A current
#adjustable voltage
#thermal shutdown
#power supply
#TO-220 package
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LT1084 Technical Summary
LT1084 High Efficiency Linear Regulator
Overview
The LT1084 is a high-efficiency linear voltage regulator designed to provide stable output voltages with low dropout characteristics. It is part of a family of regulators (LT1083/LT1084/LT1085) that offer varying current capabilities. The LT1084 is specifically optimized for applications requiring up to 5A of continuous output current with excellent line and load regulation.
This regulator features internal current limiting, thermal shutdown protection, and adjustable or fixed output voltage options. Its low dropout voltage makes it particularly suitable for applications where the input-to-output differential is small.
Key Features
- 5A output current capability
- Low dropout voltage: typically 1.5V at full load
- Available in fixed output voltages: 3.3V, 5V, and 12V
- Adjustable output voltage version available (1.25V to 28V)
- Internal current limiting and thermal shutdown
- 100% thermal limit functional test
- Wide operating temperature range:
- Commercial ("C" grade): 0°C to 125°C (control section)
- Military ("M" grade): -55°C to 150°C (control section)
- Excellent line and load regulation
Applications
The LT1084 is suitable for a wide range of applications including:
- High efficiency linear regulators
- Post regulators for switching power supplies
- Constant current regulators
- Battery chargers
- Distributed power systems
- Industrial power supplies
- Automotive electronics
- Telecommunications equipment
Electrical Characteristics
Absolute Maximum Ratings
- Input Voltage: 30V (transient)
- Operating Input Voltage:
- 3.3V, 3.6V, and 5V devices: 20V
- 12V devices: 25V
- Operating Junction Temperature Range:
- "C" Grades: 0°C to 125°C (control section), 0°C to 150°C (power transistor)
- "M" Grades: -55°C to 150°C (control section), -55°C to 200°C (power transistor)
- Storage Temperature Range: -65°C to 150°C
- Lead Temperature (soldering, 10 sec): 300°C
Output Voltage Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| LT1084-3.3 Output Voltage | IOUT = 0mA, TJ = 25°C, VIN = 8V (K Package) | 3.270 | 3.300 | 3.330 | V |
| 0 ≤ IOUT ≤ 5A, 4.8V ≤ VIN ≤ 15V | 3.235 | 3.300 | 3.365 | V | |
| LT1085-3.6 Output Voltage | VIN = 5V, IOUT = 0mA, TJ = 25°C (K Package) | 3.564 | 3.600 | 3.636 | V |
| 5V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ 3A | 3.500 | - | 3.672 | V |
Important Notes
- For input voltages greater than the maximum operating input voltage, some degradation of specifications will occur
- For input/output voltage differentials greater than 15V, a minimum external load of 5mA is required to maintain regulation
- Stability requires proper output capacitance (22µF tantalum recommended)
Package Information
Available Packages
- K Package: 2-lead TO-3 metal can
- Thermal resistance (θJA): 35°C/W
- T Package: 3-lead plastic TO-220
- Thermal resistance (θJA): 45°C/W
- P Package: 3-lead TO-3P plastic
- Thermal resistance (θJA): 50°C/W
- M Package: 3-lead plastic DD
- Thermal resistance (θJA): 30°C/W (when soldered to 0.52in² copper area)
- θJA can vary from 20°C/W to >40°C/W depending on mounting technique
Pin Configurations
- K Package (TO-3 Metal Can):
- Pin 1: VIN
- Pin 2: GND
- Case: Output
- T/P/M Packages:
- Pin 1: VIN
- Pin 2: VOUT
- Pin 3: GND
- Tab is connected to VOUT
