LD1117S33CTR 3.3V LDO Voltage Regulator with 1A Output Low Dropout Voltage High

Product Specification

LD1117S33CTR 3.3V LDO Voltage Regulator with 1A Output Low Dropout Voltage High Accuracy Over-Current & Thermal Protection Stable with Ceramic Capacitors SOT-223 Package

Features

• Low dropout voltage (1 V typ.)

• Output current up to 800 mA SO-8

• Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V

• Adjustable version availability (VREF = 1.25 V)

• Internal current and thermal limit

• Available in ± 1 % (at 25 °C) and 2 % in full temperature range

• Supply voltage rejection: 75 dB (typ.)

Applications

1. Consumer Electronics

Smart Home Devices: Such as Wi-Fi smart plugs, sensors, remotes, etc., used to power the main MCU and sensor modules.

Portable Devices: Such as MP3 players, digital photo frames, handheld fans, etc., for voltage conversion and regulation for downstream circuits.

Computer Peripherals: Such as auxiliary power on motherboards, USB hubs, internal cards.

2. Communication & Networking Equipment

Network Modules: Providing power for earlier-generation Ethernet controllers and Wi-Fi modules (which often require a 3.3V supply).

Routers/Switches: Providing auxiliary power for certain chips on the board.

Optical Modules: Also used in some traditional optical transceivers.

3. Industrial Control & Automation

Industrial Control Boards: Providing 3.3V power for logic circuits, MCUs, op-amps, etc., in PLCs and industrial controllers.

Sensor Interfaces: Many sensors (temperature, pressure, humidity) operate at 3.3V, making the LD1117 an ideal power source.

Measurement & Test Equipment: Powering analog and digital circuits in data acquisition cards and instruments.

4. Automotive ElectronicsIn-Vehicle Infotainment Systems: Powering low-power components in devices like radios, navigation systems.

Body Control Modules: Such as window controllers, wiper controllers, and other ECU units requiring a stable 3.3V supply.

5. Embedded Systems & Projects

Arduino Shields: Commonly used on shields to convert a higher voltage (e.g., 5V or 9V) down to 3.3V for powering 3.3V sensors or devices.

Raspberry Pi/STM32 Development Boards: Used in custom expansion boards or projects to provide a 3.3V power rail for external components.

Electronic DIY Projects: Used in almost any hobbyist or professional project that requires stepping down from inputs like 5V/6V/9V to 3.3V.

Description

The LD1117 is a low drop voltage regulator able to provide up to 800 mA of output current, available even in adjustable version (VREF = 1.25 V). Concerning fixed versions, are offered the following output voltages: 1.2 V, 1.8 V, 2.5 V, 3.3 V and 5.0 V. The device is supplied in: SOT-223, DPAK, SO-8 and TO-220. The SOT 223 and DPAK surface mount packages optimize the thermal characteristics even offering a relevant space saving effect. High efficiency is assured by NPN pass transistor. In fact in this case, unlike than PNP one, the quiescent current flows mostly into the load. Only a very common 10 µF minimum capacitor is needed for stability.

On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 1 % at 25 °C. The adjustable LD1117 is pin to pin compatible with the other standard. Adjustable voltage regulators maintaining the better performances in terms of drop and tolerance.

INFORMATION

Drawing

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