FDA803Q - 1A, 35V Ultra-Low Noise LDO | Texas Instruments
MPN: FDA803Q ✓ פעילFDA803Q סקירה
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. It operates by dissipating excess power as heat, providing a clean, low-noise output. LDOs are essential in power management ICs, serving as the final stage in a power supply chain to filter out ripple and noise from switching regulators. The FDA803Q fits into the hierarchy: LDO -> linear regulator -> voltage regulator -> power management IC -> semiconductor.
Key features include 4.17 uVrms output noise (20 Hz to 100 kHz), 72 dB PSRR at 1 kHz, and a low dropout voltage of 200 mV at full 1A load. The device also offers 6.4 mA quiescent current, an active-high enable pin for power sequencing, and thermal shutdown protection. The VQFN-20 package provides a thermal resistance of 31.4 C/W, enabling compact designs without external heatsinking at moderate power levels.
The FDA803Q utilizes a bipolar architecture with a precision bandgap reference, achieving noise performance comparable to discrete reference designs while maintaining regulator simplicity. The high PSRR minimizes ripple from upstream switching converters, making it suitable for noise-sensitive analog and RF signal chains where clean power rails are critical.
Typical applications include high-end audio DAC power supplies, PLL/VCO power rails in RF transceivers, precision ADC/DAC reference buffering, and test and measurement instrumentation. The wide input range also supports industrial 24V bus systems with adequate headroom.
When designing with this device, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. The enable pin allows sequential power-up in multi-rail systems, which is essential for processors requiring specific rail sequencing.
חלופות תחליף ישיר עבור FDA803Q — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם FDA803Q (אותו גורם צורה וטביעת רגל) — שונים ב Enable Pin, Input Voltage Range, MSL Level, Output Type, Output Voltage Range.
TPS7A4700RGWR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TPS7A4701RGWR-Q1
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
TPS7A4701RGWT
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LT3045EDC
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ADM7150ARDZ
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
FDA803Q דירוגים מרביים ומאפיינים חשמליים
| סוג פלט | Adjustable |
| טווח מתח פלט | 1.4 V to 34 V |
| זרם מוצא מקסימלי | 1 A |
| טווח מתח כניסה | 3 V to 35 V |
| מתח נפילה | 200 mV at 1 A |
| רעש בפלט | 4.17 uVrms (20 Hz to 100 kHz) |
| PSRR | 72 dB at 1 kHz |
| זרם מנוחה | 6.4 mA |
| התנגדות תרמית | 31.4 C/W |
| טמפרטורת פעולה | -40C to +125C |
| מארז | VQFN-20 (RGW) 5x5 mm |
| סוג הרכבה | Surface Mount |
| רמת MSL | 2 (1 year) |
| סטטוס RoHS | Compliant |
| פין הפעלה | Yes (active-high) |
תצורת פינים של FDA803Q
| פין 1 | OUT — Regulated output voltage |
| פין 5 | GND — Ground |
| פין 6 | EN — Enable (active high) |
| פין 7 | IN — Input supply |
| פין 9 | NR/SS — Noise reduction/soft-start capacitor |
| פין 10 | FB — Feedback for output voltage setting |
| פין 13 | GND — Ground |
| פין 17 | OUT — Regulated output voltage |
| פין 20 | IN — Input supply |
| פין 21 | PAD — Exposed thermal pad (connect to GND) |
יישומים טיפוסיים
FDA803Q מתאים עבור 6 יישוםs: High-End Audio DAC Power Supply, RF Transceiver Power Supply, Precision ADC Reference Buffer, Industrial 24V Bus Power, Test and Measurement Instrumentation, Portable Medical Devices.
High-End Audio DAC Power Supply
Provides clean 5V rail for audio DACs with 4.17uVrms noise. The FDA803Q's ultra-low noise and high PSRR ensure that the power supply does not introduce audible artifacts into the audio signal. In a typical audio DAC application, the FDA803Q is placed between the system 5V rail and the DAC's AVDD pin, with a 10uF ceramic capacitor on input and output. Compared to switching regulators, the LDO eliminates switching noise but dissipates more power; for a 12V-to-5V conversion at 500mA, power dissipation is 3.5W, requiring adequate thermal management.
מומלץ
RF Transceiver Power Supply
Powers PLL/VCO circuits with 72dB PSRR at 1kHz, minimizing phase noise. The FDA803Q's high PSRR suppresses ripple from upstream switching regulators, which is critical for RF signal integrity. In an RF transceiver, the FDA803Q is used to power the VCO and PLL, with a 0.1uF capacitor close to the VCC pin to filter high-frequency noise. The low noise floor of 4.17uVrms ensures that the power supply does not contribute to phase noise, improving overall system performance.
מומלץ
Precision ADC Reference Buffer
Buffers reference voltage for 24-bit ADCs with 4.17uVrms noise. The FDA803Q's low noise and high accuracy make it ideal for driving the reference input of precision ADCs. In a data acquisition system, the FDA803Q is used to generate a clean 5V reference from a noisy 12V rail, with a 10uF capacitor on the output to stabilize the reference. The low dropout voltage of 200mV ensures that the reference remains regulated even with input voltage variations.
מומלץ
Industrial 24V Bus Power
Regulates 24V industrial bus to 5V for sensors and microcontrollers. The FDA803Q's wide input range of up to 35V makes it suitable for industrial applications where the supply voltage can vary. In a factory automation system, the FDA803Q is used to power a microcontroller and sensors from a 24V bus, with a 10uF input capacitor to handle transients. The thermal shutdown protection ensures safe operation in harsh environments.
מומלץ
Test and Measurement Instrumentation
Provides clean power for oscilloscopes and signal generators. The FDA803Q's low noise and high PSRR are essential for maintaining measurement accuracy. In a benchtop instrument, the FDA803Q is used to power analog front-end circuits, with a 10uF output capacitor to reduce noise. The enable pin allows for power sequencing in multi-rail systems, ensuring that sensitive analog circuits power up after digital circuits.
מומלץ
Portable Medical Devices
Powers low-noise analog front-ends in portable monitors. The FDA803Q's low quiescent current of 6.4mA extends battery life in portable devices. In a portable ECG monitor, the FDA803Q is used to power the analog front-end, with a 10uF output capacitor to filter noise. The small VQFN-20 package saves board space, and the wide input range accommodates battery voltage variations.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור FDA803Q — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | TPS7A4700RGWR | TPS7A4701RGWR-Q1 | TPS7A3301RGWR |
|---|---|---|---|---|
| Package | VQFN-20 (RGW) | VQFN-20 (RGW) - same | VQFN-20 (RGW) - same | VQFN-20 (RGW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 1 A | 1 A | 1 A | 1 A (negative) |
| Output Voltage Range | 1.4V to 34V | 1.4V to 34V | 1.4V to 34V | -36V to -1.4V |
| Enable Pin | Yes (active-high) | No | Yes (active-high) | Yes (active-high) |
| Automotive Grade | No | No | Yes (AEC-Q100) | No |
| Output Noise | 4.17 uVrms | 4.17 uVrms | 4.17 uVrms | 3.8 uVrms |
| PSRR at 1kHz | 72 dB | 72 dB | 72 dB | 75 dB |
מבדילים עיקריים
- Only VQFN-20 family member with enable pin (לעומתTPS7A4700RGWR)
- Automotive grade option available (לעומתTPS7A4701RGWR-Q1)
- Positive voltage polarity (לעומתTPS7A3301RGWR)
הערות תכנון
At VIN=12V, VOUT=5V, and 1A load, power dissipation is 7W. The VQFN-20 package has theta_JA of 31.4 C/W, resulting in a 220C junction temperature rise. A heatsink or at least 1 square inch of copper pour is required for reliable operation above 2W dissipation.
Place input and output capacitors as close to the IC pins as possible. Use a 10uF ceramic capacitor on the input and a 10uF ceramic capacitor on the output. Add a 0.1uF ceramic capacitor in parallel for high-frequency noise bypass.
Do not exceed the maximum input voltage of 35V. Ensure the external resistor divider uses 1% or better tolerance resistors to maintain output voltage accuracy. The NR/SS capacitor controls startup time and noise bandwidth - do not omit it.
מידע על תאימות
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose TPS7A4701RGWR-Q1 for automotive.
