Infineon BAT6405E6327HTSA1: Key Specifications and Application Circuit Design
The Infineon BAT6405E6327HTSA1 is a high-performance, low-dropout (LDO) linear voltage regulator designed for a broad range of applications requiring a stable and clean power supply. This component integrates advanced features such as ultra-low noise, high power supply rejection ratio (PSRR), and a very low quiescent current, making it an ideal choice for powering noise-sensitive devices, including RF modules, audio equipment, and precision sensors.
Key Specifications
The BAT6405E6327HTSA1 is characterized by several critical parameters that define its operational envelope and suitability for various designs:
Output Voltage: Fixed at 3.3V, a common standard for modern microcontrollers and digital ICs.
Maximum Output Current: Capable of delivering up to 150mA, sufficient for powering multiple low-power ICs or a single more demanding load.
Dropout Voltage: Features an exceptionally low dropout voltage, typically 90mV at 100mA load. This allows it to regulate the output voltage even when the input voltage is only slightly above the output level, maximizing efficiency and extending battery life in portable applications.
Ultra-Low Quiescent Current: With a typical quiescent current of just 28µA, this LDO is exceptionally efficient under light load conditions, a critical factor for always-on, battery-powered devices.
High PSRR: Boasts a high Power Supply Rejection Ratio of 70dB at 1kHz, enabling it to effectively filter out ripple and noise from the input supply, ensuring a clean and stable output.
Low Output Noise: The internal architecture ensures a very low output noise level of 40µVₙᵣₘₛ (10Hz to 100kHz), which is paramount for analog and RF circuits.
Packaging: Housed in a compact SOT-23-5 package, it is optimized for space-constrained PCB designs.
Application Circuit Design
Implementing the BAT6405E6327HTSA1 in a circuit is straightforward, typical of most LDO regulators. However, attention to detail is required to achieve its specified performance.
A basic application circuit requires only two external capacitors:
1. Input Capacitor (Cɪɴ): A 1µF ceramic capacitor should be placed as close as possible to the VIN and GND pins of the IC. This capacitor stabilizes the input supply, provides instantaneous current, and helps suppress any incoming high-frequency noise.
2. Output Capacitor (Cᴏᴜᴛ): A 1µF ceramic capacitor is also recommended on the output. This component is crucial for ensuring loop stability, improving transient response, and further reducing output noise.
Design Considerations for Optimal Performance:
PCB Layout: For best noise performance and stability, keep the path from the input capacitor to the VIN pin and from the VOUT pin to the output capacitor as short and direct as possible. A solid ground plane is highly recommended.
Thermal Management: Although the SOT-23 package has limited thermal capabilities, the low dropout voltage minimizes power dissipation (Pᴅɪꜱꜱ = (Vɪɴ - Vᴏᴜᴛ) Iʟᴏᴀᴅ). For maximum load current, ensure the input voltage is not excessively higher than the output voltage to avoid overheating.
Noise-Critical Applications: In scenarios where the lowest possible noise is required, ensure the input supply itself is clean. The high PSRR will handle residual noise, but a noisy input will challenge any regulator.
This LDO is perfectly suited for post-DC/DC converter regulation, where it can clean up the switching noise from a buck or boost converter to provide a pure voltage rail for analog subsystems.
ICGOOODFIND: The Infineon BAT6405E6327HTSA1 stands out as an exceptional LDO regulator, offering a compelling combination of ultra-low noise, high PSRR, and minimal quiescent current. Its simple design-in process, requiring only two external components, makes it a go-to solution for engineers designing power supplies for portable, battery-operated, and noise-sensitive electronic equipment.
Keywords: Low-Dropout (LDO) Regulator, Ultra-Low Noise, High PSRR, Low Quiescent Current, Battery-Powered Applications.
