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The following provides detailed information regarding the TLE4275Q chip:
Technical Parameters
- Output Voltage: 5.0 V ± 2% (Fixed Output)
- Maximum Output Current: 450 mA (Typical), 500 mA (Select Versions)
- Input Voltage Range: 5.5 V – 45 V (45 V Max Transient)
- Dropout Voltage: 170 mV (Typical) @ 250 mA; 500 mV (Max) @ 450 mA
- Quiescent Current (Iq): 170 µA (Typical); 300 µA (Max)
- Shutdown Current: 1 µA (Typical)
- Operating Junction Temperature Range: -40°C to +150°C (Automotive Grade)
- Thermal Shutdown Temperature: 175°C (Typical); 15°C Hysteresis
- Protection Features:
- Thermal Shutdown
- Short-Circuit Protection (Current Limit)
- Reverse Polarity Protection
- Overvoltage Protection
- Reset Function (RESET):
- Power-On Reset
- Undervoltage Reset
- Reset Threshold: 4.65 V (Typical) (during output voltage drop)
- Reset Delay: Programmable via external capacitor on DELAY pin
- Package Thermal Resistance:
- TO-263-5 (KTT): θJA ≈ 38.8°C/W, θJC ≈ 2.6°C/W
- TO-252-5 (KVU): θJA ≈ 55.6°C/W, θJC ≈ 3.2°C/W
- HTSSOP-20 (PWP): θJA ≈ 43.4°C/W, θJC ≈ 4.7°C/W
Pin Configuration (TO-263-5 / TO-252-5)
Pin Name Function
1 IN Input Voltage; requires a ceramic bypass capacitor connected to GND.
2 RESET Open-drain reset output; requires an external pull-up resistor.
3 GND Ground; internally connected to the heat sink.
4 DELAY Reset delay time setting; requires an external capacitor connected to GND.
5 OUT Regulated Output; requires a capacitor of ≥ 22 µF connected to GND.
Typical Application Circuit
- Input Capacitor: 10 µF electrolytic + 100 nF ceramic (placed close to the IN pin).
- Output Capacitor: 22 µF to 500 µF, ESR 1 mΩ – 20 Ω (low-ESR X5R/X7R ceramic capacitors are recommended).
- DELAY Capacitor: 100 pF to 500 nF; determines the RESET delay time.
- RESET Pull-up Resistor: Typically 10 kΩ to 100 kΩ.
Alternative Models
Model Manufacturer Key Differences
TLE720M05 Infineon Higher current capability.
TLV1117-50-Q1 TI 1A output; no reset function.
TL431 + External Transistor Multiple Requires external adjustment components; lower cost.
TPS7B86-Q1 TI 500 mA output; includes Power-Good function.
TPS7B87-Q1 TI 500 mA output; adjustable output voltage.
Important Notes
- Compatibility: The TLE4275Q features a fixed 5V output and is non-adjustable; if a different voltage is required, please select an adjustable model or an alternative solution.
- Installation Guidelines:
- TO-263/TO-252 packages require adequate heat dissipation; a copper pad area of ≥ 6 cm² (single-layer PCB) is recommended, or use thermal vias to conduct heat to internal PCB layers.
- The capacitor connected to the DELAY pin determines the reset delay time; a typical value of 100 nF corresponds to a delay of approximately 10 ms. The specific delay can be calculated using the formula: t_delay ≈ C_DELAY × 0.7 V / 2.2 µA. - Excessive ESR in the output capacitor may lead to instability; priority should be given to X5R/X7R ceramic capacitors or low-ESR tantalum capacitors.
- Technical Support: For further technical assistance, it is recommended to contact Texas Instruments or an authorized distributor.
Summary
The TLE4275Q is a high-performance, automotive-grade 5V low-dropout (LDO) regulator manufactured by Texas Instruments. It integrates various functions—including power-on/undervoltage reset, overtemperature protection, short-circuit protection, and reverse-polarity protection—making it suitable for providing regulated 5V power within 12V/24V automotive power systems. Its wide input voltage range, ultra-low quiescent current, and comprehensive protection mechanisms ensure high practicality and reliability in automotive body electronics applications, such as instrument clusters, Body Control Modules (BCMs), and HVAC systems.
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