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LP3883ESX-1.2/NOPB

3 A ultra-LDO, 1.2 V fixed, 210 mV dropout, CMOS, TO-263, external bias

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Pieza del fabricante：

LP3883ESX-1.2/NOPB

Paquete：

TO-263 (DDPAK-5 / KTT) — 10.16 x 15.24 mm

Marca：

Categorías de productos：

Circuitos integrados IC, Reguladores de baja caída (LDO)

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Descripción

Productos

The LP3883ESX-1.2/NOPB is a 3 A ultra-low-dropout linear regulator from Texas Instruments with a fixed 1.2 V output. Packaged in a TO-263 (DDPAK-5), it uses a CMOS architecture with external bias rail for ultra-low VIN operation. The device features 210 mV typical dropout at 3 A, low ground current, and fast transient response, making it ideal for high-current, low-voltage core power applications.

Especificaciones

Output Voltage	1.2 V (Fixed)
Corriente de salida	3 A
Input Voltage Range	1.426 V to 5.5 V (VIN) / 4.5–6 V (VBIAS)
Dropout Voltage	210 mV typical at 3 A
Ground Pin Current	3 mA typical at full load
Shutdown Current	60 nA typical
Paquete	TO-263 (DDPAK-5 / KTT)
Temperatura de funcionamiento	-40°C to +125°C

Características

Ultra-low dropout: 210 mV at 3 A using NMOS pass transistor
CMOS architecture — negligible drive current vs. bipolar LDOs
External bias rail enables operation from ultra-low VIN
Fast transient response for DSP and microcontroller cores
1.5% output accuracy at 25°C

Aplicaciones

DSP and microcontroller core voltage regulation
FPGA core power supplies
Switch-mode power supply post-regulation
High-current low-voltage point-of-load regulation
Server and computing core power

Introducción del producto:LP3883ESX-1.2/NOPB Presentación del producto

The LP3883 is a high-current, fast-response ultra-low-dropout linear regulator from Texas Instruments. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides gate drive for the NMOS power transistor, while VIN supplies power to the load. This dual-rail architecture enables operation from ultra-low VIN voltages while maintaining regulation. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load. The 1.2 V fixed version delivers 3 A with only 210 mV dropout, making it ideal for high-current core voltage applications.

Principio de funcionamiento:LP3883ESX-1.2/NOPB Principio de funcionamiento

The LP3883 uses an NMOS pass transistor driven by an external VBIAS rail (4.5–6 V), which provides sufficient gate drive even when VIN is very close to VOUT. The output voltage is sensed by an internal resistor divider and compared against a precision bandgap reference. The error amplifier drives the NMOS gate to maintain regulation. The NMOS pass device provides very low dropout voltage because the gate can be driven above VIN by the VBIAS rail, allowing the transistor to fully enhance. The CMOS architecture means gate drive current is negligible compared to the base current required by PNP-based bipolar LDOs. The shutdown pin turns off the NMOS gate drive, reducing current to 60 nA.

Descripción de la clavija:LP3883ESX-1.2/NOPB Definición y funciones de las clavijas

Pin	Nombre	Tipo	Función
1	VIN	Entrada	Input supply to load (1.426–5.5 V)
2	GND	Potencia	Ground / thermal tab
3	SD	Entrada	Shutdown control (low = off)
4	VBIAS	Entrada	Bias supply for NMOS gate drive (4.5–6 V)
5	VOUT	Salida	Regulated 1.2 V output

Application Scenarios:In which products and applications isLP3883ESX-1.2/NOPB usado

1.2 V DSP core power from 1.8 V or 2.5 V rail
FPGA VCCINT regulation at 1.2 V
Post-regulation after a switching regulator for noise-sensitive loads
Server CPU and memory core voltage regulation
High-current POL regulation in computing platforms

Alternative Models:What chips are recommended as replacements for LP3883ESX-1.2/NOPB

Fabricante	Número de pieza	Paquete	Notas
TI	LP3883ESX-1.5/NOPB	TO-263	1.5 V output variant
TI	TPS5450DDAR	8-SO-PowerPAD	5 A buck converter, switching alternative
Dispositivos analógicos	ADP3228ACPZ-1.2-R7	8-LFCSP	3 A LDO, 1.2 V
Maxim	MAX8556ETE+T	28-TSSOP	6 A LDO controller
Infineon	TLE4274GV33	TO-252	200 mA LDO, 3.3 V, automotive