الصفحة الرئيسية > الدوائر المتكاملة الدوائر المتكاملة > TPS7A4501DCQR

TPS7A4501DCQR

1A LDO, 20V, 35uVrms noise, 63dB PSRR, SOT-89-6

4200

المخزون الفعال

انتقل إلى الاستفسار

Image for reference only

جزء الشركة المصنعة ： جزء الشركة المصنعة

TPS7A4501DCQR

الحزمة ： الحزمة

6-Pin SOT-89 (4.5 x 2.5 x 1.5 mm)

العلامة التجارية ： العلامة التجارية

فئات المنتجات:：فئات المنتجات

الدوائر المتكاملة الدوائر المتكاملة, منظِّمات التسرب المنخفض (LDO)

توصيات أخرى قد تكون مهتماً بها.

IS43TR16256BL-125KBLI

الوصف

نظرة عامة على المنتج

The TPS7A4501DCQR is a Texas Instruments 1A 20V LDO with 35uVrms output noise, 63dB PSRR at 1kHz, and 200mV dropout. Designed for noise-sensitive RF and analog loads. Packaged in 6-pin SOT-89, -40C to +125C.

المواصفات الرئيسية

تيار الإخراج	1 A
Input Range	3.0 V to 20 V
Noise	35 uVrms (10Hz-100kHz)
PSRRR	63 dB @ 1kHz
Dropout	200 mV @ 1A
الحزمة	SOT-89-6

الميزات

1A output current
35uVrms ultra-low noise
63dB PSRR at 1kHz
3.0V to 20V input range
200mV dropout at 1A
NR pin for noise reduction
SOT-89-6 power package

التطبيقات

RF and VCO power supply
High-speed ADC/DAC supply
Post-regulation after DC-DC
Test and measurement

مقدمة المنتج:TPS7A4501DCQR مقدمة المنتج

The TPS7A4501DCQR is a Texas Instruments 1A low-noise LDO regulator in a 6-pin SOT-89 power package, designed for noise-sensitive RF, analog, and precision applications. The 35uVrms output noise over 10Hz to 100kHz and 63dB PSRR at 1kHz make it one of the best LDOs for cleaning switching DC-DC converter output noise for RF VCOs, PLLs, and high-resolution data converters. The 3.0V to 20V input range supports post-regulation from common 5V, 12V, and 15V DC-DC outputs. The 200mV dropout at 1A provides good efficiency with moderate headroom. The NR (noise reduction) pin accepts an external capacitor (typically 0.01uF) that filters the internal reference noise, achieving the 35uVrms specification. An EN (enable) pin allows shutdown to reduce supply current. The SOT-89-6 package with exposed thermal pad provides low thermal resistance (34C/W typical) for 1A output at higher input-output differentials. The device is stable with ceramic output capacitors (2.2uF minimum). Packaged in SOT-89-6 rated for -40C to +125C.

مبدأ العمل:TPS7A4501DCQR مبدأ العمل

The TPS7A45 uses an NMOS pass transistor architecture with an internal charge pump to generate the gate voltage above the output. The NMOS architecture provides several advantages: very low output noise (since the noise is not multiplied by the pass element gain), high PSRR (the NMOS source-follower topology inherently rejects input noise), and fast transient response (the low output impedance of the source follower). The internal bandgap reference provides the target voltage, with the NR pin capacitor creating a low-pass filter that attenuates reference noise below the error amplifier bandwidth. The error amplifier drives the NMOS gate to maintain regulation. The charge pump generates the gate voltage from the input supply, requiring VIN at least 1.4V above VOUT for proper charge pump operation. During dropout (VIN-VOUT less than 200mV at 1A), the charge pump cannot fully enhance the NMOS, and the output voltage drops below the target. Current limit and thermal shutdown protect the device during fault conditions.

وصف الدبوس:TPS7A4501DCQR تعريف الدبوس ووظائفه

دبوس	Mnemonic	الوصف
1	في	Input supply (3.0-20V)
2	NR	Noise reduction (0.01uF cap)
3	EN	Enable (active high)
4	GND	Ground (exposed pad)
5	انتهى	Regulated output
6	نورث كارولاينا	No connect

Application Scenarios:In which products and applications isTPS7A4501DCQR مستعمل

RF VCO and PLL clean power supply with 35uVrms noise and 63dB PSRR for DC-DC cleanup
High-speed 16-bit ADC/DAC analog supply with low-noise post-regulation from 12V DC-DC
Post-regulation after switching converter for noise-sensitive test and measurement instruments
GPS receiver LNA supply with NR pin capacitor for ultra-low noise floor

Alternative Models:What chips are recommended as replacements for TPS7A4501DCQR