1. Overview:

️· What it is: A high-performance, high-voltage, low-dropout (LDO) regulator.
️· Sourcing Capability: 150mA
️· Temperature Range: -40°C to +125°C (automotive grade)
️· Key Features:
- Ultra-low quiescent current (ideal for "always-on" applications)
- High-voltage tolerance (can handle up to 40V input under load dump conditions)
- Can operate down to 3V input ("cold crank" condition)
- Current limit and thermal shutdown protection

2. Functional Description:

️· Enable Pin: Controls the device on/off. Low = shutdown (very low current draw).
️· Current Limit: Protects the regulator during overload or short-circuit conditions.
️· Thermal Shutdown: Shuts down the regulator if the die temperature exceeds +165°C, preventing damage. The device restarts once the temperature cools down to +145°C.

3. Application Information:

️· Input/Output Capacitors:
- Minimum 0.1µF ceramic capacitor at the input.
- Recommended 10µF ceramic capacitor at the output for stability. Close to the IC with short, direct ground connections.
️· Output Voltage Setting (Adjustable Version): Uses an external resistor divider.
️· Power Dissipation: Critical for thermal management. Requires careful consideration of the PCB layout and heat sinking.
️· PCB Layout Recommendations:
- Minimize ground impedance.
- Keep parasitic inductance low.
- Place capacitors close to the IC with short ground connections.
- Keep feedback traces away from noisy traces.
- The EPAD of the package MUST be soldered to a copper plane (ground plane) for effective heat dissipation.
️· Thermal Resistance: Provided in Figure 13, showing how thermal resistance (θJA) changes with copper area.

4. Key Equations & Parameters:

️· Output Voltage Calculation (Adjustable Version):
- V OUT = 1.223V × ⎛⎜⎝R ----- R 12 - + 1⎞⎟⎠
️· Power Dissipation:
- P D = (V IN – V OUT ) × I OUT + V IN × I GND
️· Junction Temperature Rise:
- ΔT J = T J MAX( ) – T A MAX( )
️· Maximum Ambient Temperature:
- T J MAX( ) = P D MAX( ) [ x ][θ] JA + T A
️· Shutdown Current: Less than 2µA
️· Current Limit: Protection during short circuits/overload
️· Thermal Shutdown Temperature: output shutdown at +165°C. Restarts at +145°C.