الصفحة الرئيسية > الدوائر المتكاملة الدوائر المتكاملة > TPS7A8801RTJT

TPS7A8801RTJT

Ultra-Low-Noise LDO, 1A, 0.8uVrms, 72dB PSRR, QFN-12

2345

المخزون الفعال

انتقل إلى الاستفسار

Image for reference only

جزء الشركة المصنعة ： جزء الشركة المصنعة

TPS7A8801RTJT

الحزمة ： الحزمة

QFN-12 (3.5 x 3.5 x 1.0 mm, exposed pad)

العلامة التجارية ： العلامة التجارية

فئات المنتجات:：فئات المنتجات

الدوائر المتكاملة الدوائر المتكاملة, الدوائر المتكاملة لإدارة الطاقة (PMIC)

توصيات أخرى قد تكون مهتماً بها.

SII9396SCNUC-BAR

IS43TR16256BL-125KBLI

الوصف

نظرة عامة على المنتج

The TPS7A8801RTJT from Texas Instruments is an ultra-low-noise LDO regulator with 1A output, 0.8uVrms noise, and 1.4V to 6.5V input in a QFN-12 package.

المواصفات الرئيسية

النوع	Ultra-Low-Noise LDO Linear Regulator
جهد الإدخال	1.4 V to 6.5 V
جهد الخرج	Adjustable (0.8V to 5.0V)
تيار الإخراج	1 A
ضوضاء الإخراج	0.8 uVrms (10Hz to 100kHz, VOUT=1.8V)
PSRRR	72 dB @ 1kHz
جهد التسرب	120 mV @ 1A
Accuracy	+/-1% over line, load, temperature
تيار التهدئة	1.3 mA (typical)
الحزمة	QFN-12 (3.5 x 3.5 x 1.0 mm, RTJ suffix)
درجة حرارة التشغيل	-40C to +125C

الميزات

0.8 uVrms ultra-low output noise
72 dB PSRR at 1 kHz
1A output current with 120 mV dropout
+/-1% output accuracy
Adjustable output from 0.8V to 5.0V
NR/SS pin for soft-start and noise reduction

التطبيقات

RF and PLL power supply
High-speed ADC/DAC reference
Camera sensor power
Test and measurement equipment

مقدمة المنتج:TPS7A8801RTJT مقدمة المنتج

The TPS7A8801RTJT from Texas Instruments is an ultra-low-noise, high-PSRR LDO linear regulator designed for noise-sensitive applications such as RF transceivers, high-speed data converters, and precision analog circuits. The 0.8 uVrms output noise from 10 Hz to 100 kHz is among the lowest available, ensuring minimal phase noise contribution to VCOs and PLLs. The 72 dB PSRR at 1 kHz effectively rejects input supply ripple, reducing the need for pre-filtering. The 1A output current supports moderate-power loads including FPGA I/O banks and processor cores. The 120 mV dropout voltage at 1A allows efficient regulation from low headroom supplies. The NR/SS (Noise Reduction / Soft Start) pin connects an external capacitor that filters the internal bandgap reference noise and provides a controlled output voltage ramp. The QFN-12 package with exposed pad provides excellent thermal performance.

مبدأ العمل:TPS7A8801RTJT مبدأ العمل

The TPS7A8801 uses a PMOS pass transistor in a source-follower (common-drain) configuration. The error amplifier compares the feedback voltage (FB pin) with an internal 0.8V bandgap reference, driving the PMOS gate to regulate the output. The ultra-low noise is achieved through three techniques: (1) a low-noise bandgap reference filtered by the external NR capacitor (the dominant noise source in most LDOs), (2) a low-noise error amplifier design with chopper stabilization or auto-zeroing, and (3) a carefully optimized output stage that minimizes flicker noise contribution. The 72 dB PSRR is primarily determined by the error amplifier’s open-loop gain at low frequencies. At higher frequencies (>100 kHz), the PSRR rolls off as the amplifier bandwidth is exceeded, but the output capacitor’s impedance helps maintain some rejection. The 120 mV dropout at 1A is set by the PMOS on-resistance (Ron = 120 mOhm). The soft-start function uses the NR capacitor to slowly ramp the reference voltage, limiting inrush current.

وصف الدبوس:TPS7A8801RTJT تعريف الدبوس ووظائفه

دبوس	الاسم	النوع	الوظيفة
1	انتهى	المخرجات	Regulated output voltage
2	انتهى	المخرجات	Regulated output voltage
3	NR/SS	التناظرية	Noise reduction capacitor / Soft-start
4	FB	المدخلات	Feedback voltage (0.8V reference)
5	EN	المدخلات	Enable (HIGH=on)
6	PG	المخرجات	Power good indicator (open-drain)
7	BIAS	الطاقة	Bias supply for internal circuitry
8	GND	الطاقة	أرضي
9	في	الطاقة	Input supply (1.4-6.5V)
10	في	الطاقة	Input supply (1.4-6.5V)
11-12	GND/Pad	الطاقة	Ground / Exposed thermal pad

Application Scenarios:In which products and applications isTPS7A8801RTJT مستعمل

RF transceiver 1.8V VCO supply with 0.8uVrms noise for minimal phase noise
16-bit ADC reference buffer LDO with 72dB PSRR from switching pre-regulator
High-speed SERDES PHY power with 0.8V output at 1A from 1.2V input
Precision instrument analog rail with NR capacitor for <1uVrms noise floor

Alternative Models:What chips are recommended as replacements for TPS7A8801RTJT

الشركة المصنعة	رقم الجزء	الحزمة	الملاحظات
TI	TPS7A8800RTJT	QFN-12	Dual channel version
TI	TPS7A7001RGW	QFN-20	3A, higher current, similar noise
ADI	LT3042EMSE	MSOP-10	0.8uVrms, 200mA, similar noise class
ADI	LT3045IVSE	MSOP-10	0.8uVrms, 500mA
TI	TPS7A4700RGWR	QFN-20	1A, 3.8uVrms, lower cost