الصفحة الرئيسية > الدوائر المتكاملة الدوائر المتكاملة > NCP1117ST33T3G

NCP1117ST33T3G

1A LDO, 3.3V fixed, 1.07V dropout @ 800mA, SOT-223, +/-1% accuracy

11500

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جزء الشركة المصنعة ： جزء الشركة المصنعة

NCP1117ST33T3G

الحزمة ： الحزمة

SOT-223-3 (6.70 x 3.70 x 1.69 mm)

الوصف

نظرة عامة على المنتج

The NCP1117ST33T3G from onsemi is a low-dropout (LDO) positive linear voltage regulator providing a fixed 3.3 V output at up to 1 A in a SOT-223 package. It features a maximum dropout voltage of 1.2 V at 800 mA, output voltage accuracy of +/-1.0%, and internal current limiting and thermal shutdown protection.

المواصفات الرئيسية

جهد الخرج	3.3 V (fixed)
تيار الإخراج	1 A
جهد التسرب	1.07 V typical @ 800 mA
نطاق جهد الإدخال	Up to 20 V
دقة الإخراج	+/-1.0%
تيار التهدئة	10 mA typical
Line Regulation	0.8 mV typical
Load Regulation	4.3 mV typical
درجة حرارة التشغيل	0°C to +125°C

الميزات

Output current in excess of 1.0 A
Low dropout voltage: 1.2 V max at 800 mA over temperature
On-chip trimming for +/-1.0% output voltage accuracy
No minimum load requirement for regulation
Internal current limiting and safe operating area compensation
Thermal shutdown protection
Available in SOT-223 and DPAK packages
Pb-free device, RoHS compliant

التطبيقات

Switching power supply post-regulation
Battery chargers and consumer electronics
Active SCSI terminators
Hard disk drive controller power

مقدمة المنتج:NCP1117ST33T3G مقدمة المنتج

The NCP1117ST33T3G from onsemi is a low-dropout positive linear voltage regulator capable of providing output current in excess of 1.0 A with a fixed 3.3 V output. The device features a maximum dropout voltage of 1.2 V at 800 mA over the full operating temperature range, making it suitable for applications where the input-to-output differential is limited. On-chip trimming adjusts the output voltage to within +/-1.0% accuracy, significantly tighter than industry-standard 1117 regulators. Internal protection features include output current limiting, safe operating area compensation, and thermal shutdown, ensuring reliable operation under fault conditions. The NCP1117 series can operate with input voltages up to 20 V and does not require a minimum load to maintain regulation. The SOT-223 package provides excellent thermal performance with a junction-to-case thermal resistance that supports full 1 A output when properly heat-sinked on the PCB copper area.

مبدأ العمل:NCP1117ST33T3G مبدأ العمل

The NCP1117ST33T3G operates as a series-pass linear regulator with three main functional blocks: (1) The bandgap reference generates a precise internal voltage of approximately 1.25 V, trimmed during manufacturing to achieve the +/-1.0% output accuracy. For the fixed 3.3 V version, internal resistor dividers scale the reference to produce the regulated output. (2) The error amplifier compares a fraction of the output voltage (sensed through the internal divider) with the bandgap reference. The amplifier output drives the base of the series-pass transistor, adjusting the conductance to maintain the output at the target 3.3 V. The pass transistor operates in the linear region, dissipating excess voltage as heat. (3) The protection circuitry includes current limiting that restricts the pass transistor current to a safe level during overload, safe operating area (SOA) compensation that reduces the current limit at high input-output differentials, and thermal shutdown that disables the output when the junction temperature exceeds approximately 175°C.

وصف الدبوس:NCP1117ST33T3G تعريف الدبوس ووظائفه

رقم الدبوس.	اسم الدبوس	الوظيفة
1	GND/ADJ	Ground (fixed version) / Adjust (adjustable version)
2	VOUT	3.3 V regulated output
3	VIN	Unregulated input voltage (up to 20 V)
4	علامة التبويب	Heat sink tab (connected to VOUT internally)

Application Scenarios:In which products and applications isNCP1117ST33T3G مستعمل

Post-regulation of switching power supply outputs where the +/-1.0% accuracy provides tighter voltage regulation than the switcher alone
Consumer electronics 3.3 V power rails converting from 5 V or higher supplies with adequate heatsinking for 1 A loads
Hard disk drive controller power supply where the 1 A current capability meets the startup surge requirements
Battery charger circuits using the 3.3 V fixed output as a reference or bias supply with thermal shutdown protecting against overtemperature

Alternative Models:What chips are recommended as replacements for NCP1117ST33T3G

الطراز	العلامة التجارية	Vout	Iout	الحزمة
AMS1117-3.3	Advanced Monolithic	3.3 V	1 A	SOT-223
LD1117S33CTR	ST	3.3 V	800 mA	SOT-223
TLV1117LV33DCYR	TI	3.3 V	1 A	SOT-223
NCP1117IST33T3G	أونسمي	3.3 V	1 A	SOT-223
IRU1117-33CD	إنفينيون	3.3 V	800 mA	SOT-223