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TPS77633DR

500mA LDO, 3.3V fixed, 169mV dropout, PG output, enable, SOIC-8

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جزء الشركة المصنعة ： جزء الشركة المصنعة

TPS77633DR

الحزمة ： الحزمة

SOIC-8 (4.9 x 3.9 x 1.5mm, 1.27mm pitch)

العلامة التجارية ： العلامة التجارية

فئات المنتجات:：فئات المنتجات

الدوائر المتكاملة الدوائر المتكاملة, منظِّمات التسرب المنخفض (LDO)

توصيات أخرى قد تكون مهتماً بها.

SII9396SCNUC-BAR

IS43TR16256BL-125KBLI

الوصف

نظرة عامة على المنتج

The TPS77633DR is a fast-transient-response, 500mA low-dropout linear regulator from Texas Instruments with fixed 3.3V output, 169mV dropout, power-good output, and enable function in an 8-pin SOIC package.

المواصفات الرئيسية

جهد الخرج	3.3V fixed (±2% accuracy)
الحد الأقصى لتيار الإخراج الأقصى	500 mA
جهد التسرب	169 mV typical at 500mA
نطاق جهد الإدخال	2.7V to 10V
تيار التهدئة	85 µA typical (independent of load)
تيار إيقاف التشغيل	1 µA at 25°C
PSRRR	60dB at 100Hz
ضوضاء الإخراج	53 µVrms
Load Regulation	3 mV typical
Line Regulation	0.01%/V typical
Control Features	Enable, Power Good
درجة حرارة التشغيل	-40 درجة مئوية إلى +125 درجة مئوية
الحزمة	SOIC-8 (4.9 x 3.9mm)

الميزات

PMOS pass element for low dropout and low quiescent current
85µA quiescent current independent of output load
Fast transient response for demanding digital loads
Active-high power-good output for supply monitoring
Enable pin with TTL-compatible shutdown control
Thermal shutdown and overcurrent protection
Stable with 10µF low-ESR output capacitor
2% output voltage tolerance over line, load, and temperature

التطبيقات

DSP and FPGA core power
أجهزة محمولة تعمل بالبطارية
USB-powered peripherals
Post-regulation for switching supplies
Power management for telecom

مقدمة المنتج:TPS77633DR مقدمة المنتج

The TPS77633DR is a 500mA low-dropout linear regulator from Texas Instruments with a fixed 3.3V output. Using a PMOS pass element, the device achieves 169mV typical dropout voltage at 500mA while maintaining an ultralow 85µA quiescent current that is independent of load current. The fast transient response makes it suitable for powering digital ICs with rapidly varying current demands. An active-high power-good (PG) output indicates when the output voltage is within regulation, enabling power sequencing and reset generation. The enable (EN) pin provides shutdown control, reducing quiescent current to 1µA. The device is stable with a 10µF low-ESR output capacitor and features thermal shutdown and overcurrent protection.

مبدأ العمل:TPS77633DR مبدأ العمل

The TPS77633DR uses a PMOS transistor as the pass element, which behaves as a voltage-driven device. Unlike PNP-based LDOs where the base current is proportional to load current (IB = IC/β), the PMOS gate draws negligible DC current, resulting in the 85µA quiescent current that remains constant across the entire 0-500mA output range. The dropout voltage is determined by the RDS(ON) of the PMOS transistor: VDO = IOUT × RDS(ON) = 169mV at 500mA. The error amplifier compares a fraction of the output voltage (via the internal resistor divider for fixed-output versions) with a precision bandgap reference, and drives the PMOS gate to maintain regulation. The fast transient response results from the high bandwidth of the error amplifier and the low gate capacitance of the PMOS. The power-good comparator monitors the output voltage and drives the PG pin (open drain, active high) high when VOUT exceeds approximately 90% of the nominal value. In dropout mode, the PMOS gate is driven fully on (100% duty cycle), and unlike PNP LDOs, the quiescent current does not increase, preventing battery drain when the input voltage drops below the regulation threshold.

وصف الدبوس:TPS77633DR تعريف الدبوس ووظائفه

دبوس	الاسم	النوع	الوصف
1	EN	المدخلات	Enable (TTL high = shutdown, low = normal)
2	في	الطاقة	Input supply (2.7V-10V)
3	في	الطاقة	Input supply (2.7V-10V)
4	GND	الطاقة	أرضي
5	GND	الطاقة	أرضي
6	انتهى	الطاقة	3.3V regulated output
7	انتهى	الطاقة	3.3V regulated output
8	PG	المخرجات	Power good (open drain, active high)

Application Scenarios:In which products and applications isTPS77633DR مستعمل

DSP/FPGA Power: Fast transient response maintains regulation during rapid load steps from digital core switching
Battery Devices: 85µA Iq independent of load extends battery life; 1µA shutdown current in sleep mode
USB Peripherals: 169mV dropout at 500mA allows 5V USB input to produce stable 3.3V output
Post-Regulation: 60dB PSRR at 100Hz cleans switching supply ripple for noise-sensitive analog circuits
Power Sequencing: PG output enables downstream regulators or provides power-on reset to processors

Alternative Models:What chips are recommended as replacements for TPS77633DR

الطراز	الشركة المصنعة	الفرق الرئيسي	الحزمة	Specs
TPS77601DR	TI	Adjustable version (1.2V-5.5V), same package	-	-
TPS77618DR	TI	1.8V fixed output version	-	-
TLV1117LV33DCYR	TI	1A LDO, 3.3V, SOT-223, lower cost	-	-
AMS1117-3.3	Advanced Monolithic	1A LDO, 3.3V, SOT-223, very low cost	-	-
mic5219-3.3ym5-tr	الرقاقة الدقيقة	500mA LDO, 3.3V, SOT-23-5, PG output	-	-