LD3985J33R

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low dropout, high accuracy, low quiescent current
• Package: SOT-23
• Essence: Regulates input voltage to a stable output voltage
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Input Voltage Range: 2.5V to 6.5V
• Output Voltage: 3.3V
• Dropout Voltage: 200mV at 150mA
• Quiescent Current: 50µA
• Load Regulation: ±0.1%
• Line Regulation: ±0.05%
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LD3985J33R has three pins:

1. VIN: Input voltage pin
2. GND: Ground pin
3. VOUT: Output voltage pin

Functional Features

• Low dropout voltage ensures efficient regulation even with small input-output voltage differentials.
• High accuracy provides a stable output voltage for precise applications.
• Low quiescent current minimizes power consumption in standby or idle modes.

Advantages

• Small package size (SOT-23) allows for space-saving integration into compact electronic devices.
• Wide input voltage range enables compatibility with various power sources.
• Excellent load and line regulation ensure consistent performance under different operating conditions.

Disadvantages

• Limited output current capability may not be suitable for high-power applications.
• Higher cost compared to non-regulated voltage sources.

Working Principles

The LD3985J33R is a linear voltage regulator that uses a PNP pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage from a resistive voltage divider connected to the output. The pass transistor adjusts its resistance to maintain a stable output voltage, compensating for changes in input voltage and load conditions.

Detailed Application Field Plans

The LD3985J33R is commonly used in various electronic devices that require a stable 3.3V power supply. Some typical applications include:

1. Battery-powered devices: Portable audio players, handheld gaming consoles, and wireless communication devices.
2. Microcontroller systems: Arduino boards, Raspberry Pi, and other development platforms.
3. IoT devices: Sensors, actuators, and smart home automation systems.
4. Automotive electronics: On-board diagnostics (OBD) modules, infotainment systems, and GPS trackers.

Detailed and Complete Alternative Models

1. LM1117-3.3: Similar specifications and package type.
2. MCP1700-3302E/TO: Low quiescent current alternative.
3. TS2937CZ-3.3: Higher output current alternative.

Note: This is not an exhaustive list, and there are several other alternatives available in the market.

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