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LD1117DT33CTR

800mA LDO, 3.3V fixed, 1V dropout, DPAK

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Pieza del fabricante：

LD1117DT33CTR

Paquete：

DPAK (TO-252) (6.60 x 6.20 x 2.40 mm)

Marca：
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Descripción

LD1117DT33CTR Overview

The LD1117DT33CTR is an 800mA fixed 3.3V LDO linear regulator from STMicroelectronics, 1V dropout at 800mA, maximum input voltage 15V, in a DPak (TO-252) package, suitable for embedded system 3.3V power supply.

Key Features

  • Fixed output voltage: 3.3V
  • Maximum output current: 800mA
  • Dropout voltage: 1V at 800mA
  • Maximum input voltage: 15V
  • Line regulation: 0.2%
  • Load regulation: 0.4%

The LD1117DT33CTR is a fixed 3.3 V output, 800 mA low-dropout linear voltage regulator from STMicroelectronics in a DPAK (TO-252) surface-mount package. With a typical dropout voltage of 1 V at full load, it can regulate from a 4.3 V input to deliver a stable 3.3 V supply. The device features internal current limiting and thermal shutdown protection, requiring only a 10 uF output capacitor for stability, making it ideal for cost-sensitive point-of-load regulation.

The LD1117DT33CTR uses an NPN pass transistor in a Darlington configuration driven by an error amplifier. The error amplifier compares a fraction of the output voltage (sensed through an internal resistor divider) with a precision bandgap reference. When the output drops below the 3.3 V target, the amplifier increases drive to the pass transistor, raising the output. The NPN structure provides lower dropout than conventional PNP LDOs at moderate loads, while maintaining low quiescent current. The current limiter senses pass transistor current and reduces drive when the limit is exceeded. Thermal shutdown disables the output when junction temperature exceeds approximately 150 degrees C.

Pin Nombre Descripción
1 GND Ground reference and thermal pad connection
2 VOUT Regulated 3.3 V output; connect 10 uF capacitor to GND
3 VIN Unregulated input supply (4.3 V to 15 V)

Package: DPAK (TO-252), 3 pins. The tab (pin 2) serves as both the output and primary thermal path to the PCB copper pour.

LD1117DT33CTR uses the DPAK (TO-252, SOT-428) surface-mount package with Pin 1 = GND/Adjust, Pin 2 = VOUT (tab), Pin 3 = VIN. The large tab underneath is electrically connected to VOUT (Pin 2) and must be soldered to a PCB copper pour for both electrical continuity and thermal dissipation. Unlike the LD1117DTTR fixed version, the DT33CTR variant has the 3.3V output voltage internally trimmed. The DPAK package provides superior thermal performance compared to SOT-223, with Rth(j-a) ≈ 50°C/W on FR-4 with 1oz copper. Input and output capacitors (10µF tantalum or ceramic) must be placed within 10mm of the device pins for stable operation.

  • 3.3 V Point-of-Load Regulation: Converting 5 V or higher rails to 3.3 V for digital ICs, microcontrollers, and sensors
  • Battery-Powered Devices: Regulation from Li-ion (3.7-4.2 V) to 3.3 V logic supply with low dropout
  • Post-Regulation Filtering: Cleaning switching converter output ripple for noise-sensitive analog circuits
  • Embedded Systems: MCU and peripheral power supply in industrial control boards
  • USB-Powered Peripherals: Regulating 5 V USB bus to 3.3 V for interface ICs
Modelo Fabricante Vout Iout Vdo Paquete
AMS1117-3.3 Advanced Monolithic 3.3 V 800 mA 1.1 V SOT-223
NCV1117-3.3 onsemi 3.3 V 800 mA 1.1 V DPAK
TLV1117-33 Texas Instruments 3.3 V 800 mA 1.1 V SOT-223
LM1117MP-3.3 Texas Instruments 3.3 V 800 mA 1.1 V SOT-223
RT9169-33GB Richtek 3.3 V 500 mA 1.0 V SOT-223

LD1117DT33CTR is a 3.3V/800mA LDO from STMicroelectronics in DPAK package with 1V typical dropout voltage. The AMS1117-3.3 is the most popular budget alternative with identical 3.3V/800mA output and pin-compatible SOT-223/DPAK package. The AZ1117IH-3.3TRG1 from Diodes Inc offers 1A output current with similar dropout. For lower dropout, TLV1117LV33 provides 300mV dropout with ceramic capacitor stability. The MCP1826T-3302E/DC from Microchip guarantees anyCAP stability.

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