Tag: Voltage Regulator

662K (XC6206) LDO Regulator Guide: Ultra-Low Power for Wearables {TL00009}

The 662K is the common marking code for the XC6206 series. It is a highly precise, low power consumption, high voltage, positive voltage regulator manufactured using CMOS and laser trimming technologies. It is the “go-to” component for battery-powered devices that require a steady voltage with almost zero battery drain when the device is idle.

This guide details the 662K varieties, specifically its voltage options and technical characteristics.

Key Features of the 662K (XC6206)

  • Ultra-Low Quiescent Current: Consumes only 1.0μA typical, which is significantly lower than the AMS1117.

  • Low Dropout Voltage: Typically 250mV at 100mA, allowing the battery to be used until it is nearly drained.

  • High Input Voltage: Can handle up to 6V to 7V (depending on the specific manufacturer).

  • Current Limiting: Includes internal short-circuit protection.

  • High Accuracy: Output voltage is typically within ±2%.

Voltage Varieties and Marking Codes

The “662K” mark is the most common, but because these regulators come in many fixed voltages, the marking on the chip changes slightly depending on the output. While AMS1117 uses suffixes like “-3.3V”, the XC6206 series often uses a code system.

1. Common Fixed Voltage Models

  • XC6206P122 (1.2V): Used for low-power logic cores.

  • XC6206P182 (1.8V): Standard for sensors and low-power MCUs.

  • XC6206P252 (2.5V): Common for communication modules.

  • XC6206P302 (3.0V): Used in 3V battery applications.

  • XC6206P332 (3.3V): The most common 662K model, used to power 3.3V microcontrollers from LiPo batteries.

Available Packages

The 662K is designed for space-constrained applications, so it is almost exclusively found in surface-mount packages:

  • SOT-23: The standard 3-pin tiny package found on almost all development boards (like the ESP32 or Arduino Pro Mini).

  • SOT-89: A slightly larger package with better heat dissipation for higher current stability.

  • USP-6B: An ultra-thin, leadless package for extremely small wearable devices.

    HT77xx SOT-23  CAD Model     HT77xx SOT-89 CAD Model     

    XC6206 Datasheet Meta SearchUltra Low Power LDO Voltage Regulator XC6206 - Torex Europe

     

     

Technical Specification Overview

Parameter Value
Max Input Voltage 6.0V – 7.0V
Output Current 200mA – 250mA (Max)
Dropout Voltage 160mV @ 100mA (for 3.3V version)
Quiescent Current 1.0μA (Typical)
Output Voltage Range 1.2V to 5.0V (Fixed)
Operating Temperature -40°C to 85°C

Pro-Tips for Stability

  • Ceramic Capacitors: Unlike the AMS1117 which prefers Tantalum, the 662K works excellently with small 1.0μF to 2.2μF ceramic capacitors on both the input and output.

  • Current Limits: Remember that this is a low-power regulator. It is perfect for sensors and MCUs, but cannot power motors or large LED strips (limit your load to under 200mA).

  • Reverse Current: CMOS LDOs can be sensitive to reverse current. If there is a chance the output voltage could exceed the input voltage, add a small diode for protection.

Common Alternatives

RT9193, MCP1700, HT7333, ME6211

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HT77xx Series Guide: Efficient Step-Up Power for 2.7V-5V Projects {TL00008}

The HT7750 is a high-efficiency synchronous step-up (Boost) DC/DC converter designed for applications where a stable 5V output is required from a lower input voltage. Part of the HT77xx series, it is widely used in battery-powered devices because of its low start-up voltage and minimal power consumption.

This guide explores the features, variants, and practical implementation of the HT7750 boost converter.

Key Features of the HT7750

  • Low Start-up Voltage: Can begin operating with an input as low as 0.85V, making it ideal for single-cell battery applications.

  • High Efficiency: Typically achieves 85% efficiency, reducing energy waste and heat.

  • Low Quiescent Current: Features very low power consumption during operation, extending battery life.

  • Internal Switch: Includes a built-in power transistor, reducing the need for many external components.

  • Fixed Output: Specifically designed to provide a constant 5.0V output.

Voltage Varieties and the HT77xx Series

While the HT7750 specifically targets a 5V output, it belongs to a larger family of PFM (Pulse Frequency Modulation) converters. Depending on your circuit requirements, you might use different models from the same series:

1. Fixed Voltage Models

  • HT7727: Provides a fixed 2.7V output.

  • HT7730: Provides a fixed 3.0V output.

  • HT7733: Provides a fixed 3.3V output (extremely common for ESP8266 or low-power sensors).

  • HT7737: Provides a fixed 3.7V output.

  • HT7750: The standard 5.0V model for USB-powered devices or 5V logic.

Available Packages

The HT7750 is available in several form factors to suit different PCB designs:

  • TO-92: The classic 3-pin through-hole package, perfect for breadboarding and DIY hobbyist projects.

  • SOT-89: A small surface-mount package with good thermal performance, often found in compact consumer electronics.

  • SOT-23 / SOT-23-5: Ultra-small surface mount options for high-density circuit boards.

    HT77xx TO-92 CAD Model        HT77xx SOT-89 CAD Model        HT77xx SOT-23  CAD Model        HT77xx SOT-25 CAD Model

       

Technical Specification Overview

Parameter Value
Input Voltage Range 0.85V to 6V
Fixed Output Voltage 5.0V (±2.5% accuracy)
Output Current Up to 200mA (depending on Vin)
Start-up Voltage 0.85V Typical
Switching Frequency Up to 100kHz
Operating Temperature -40°C to 85°C

Pro-Tips for Optimal Performance

  • The Inductor Choice: Use a low-resistance inductor (typically 47µH to 100µH). A high-quality inductor prevents power loss and ensures the converter hits its maximum efficiency.

  • Schottky Diode: Since the HT7750 is a non-synchronous boost converter in most 3-pin configurations, an external Schottky diode (like the 1N5817 or 1N5819) is required for the rectification process.

  • Input/Output Capacitors: To reduce switching noise, place a 10µF to 47µF tantalum or electrolytic capacitor as close to the input and output pins as possible.

  • Minimal Traces: Keep the “switching loop” (the path between the IC, inductor, and diode) as short as possible to minimize Electromagnetic Interference (EMI).

Common Alternatives

MCP1640, TLV61220, BL8530, ME2108

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78Lxx Series Voltage Regulators: Pinout, Datasheet, and Features Guide {TL00007}

The 78Lxx series is a family of fixed-output linear voltage regulators designed for low-current applications. Often called “universal” regulators, they are found in almost every type of electronic device, from industrial equipment to household appliances. Their primary job is to take a fluctuating or high input voltage and provide a rock-steady, clean output.

This guide explores the full range of the 78Lxx family, covering everything from the popular 5V version to the high-voltage 24V models.

Key Features of the 78Lxx Family

  • Wide Voltage Range: Available in multiple fixed output voltages to suit any circuit.

  • High Input Tolerance: Capable of handling input voltages up to 30V–35V, much higher than LDO regulators.

  • Ease of Use: Requires only two external capacitors to function perfectly.

  • Robust Protection: Includes built-in thermal shutdown and internal current limiting to prevent the chip from burning out during a fault.

The 78Lxx Voltage Lineup

The “xx” in the part number represents the output voltage. While they all look the same physically, their internal tuning is different.

1. Common Low-Voltage Models

  • 78L05 (5V)/78L06 (6V): The industry standard for digital logic, microcontrollers, and sensors.

  • 78L08 (8V): Frequently used in audio equipment and older analog signaling.

  • 78L09 (9V)/78L10 (10V): The perfect choice for replacing 9V batteries in portable gadgets.

2. High-Voltage Models

  • 78L12 (12V): Used for powering relays, small DC fans, and LED strings.

  • 78L15 (15V): Common in industrial automation and operational amplifier (Op-Amp) power rails.

  • 78L24 (24V): Used in specialized high-voltage communication interfaces.

Available Packages

Depending on your PCB design, the 78Lxx is available in several form factors:

  1. TO-92 (Through-Hole): The most common “transistor-style” package used by hobbyists and for breadboarding.

  2. SOIC-8 (Surface Mount): A standard 8-pin SMD package used for automated high-volume production.

  3. SOT-89 (Surface Mount): A flat SMD package with a thermal pad for better heat management in compact designs.

                                                                                                       78Lxx TO-92 CAD Model 

    78L05 Datasheet - 5V Positive Voltage Regulator                                   Package: TO92 (Type B)      

                78Lxx  SOIC-8 CAD Model                               78Lxx SOT-89  CAD Model

        SOIC8-N | Toshiba Electronic Devices & Storage Corporation | Asia-English             PG-SOT89-4-2 | Infineon Technologies

Technical Specification Overview

Parameter Value (Standard)
Input Voltage (Max) 30V (for 5V–9V models) / 35V (for 12V–24V)
Output Current 100mA (Max)
Dropout Voltage ~1.7V to 2.0V
Quiescent Current 3mA – 6mA
Operating Temp 0°C to 125°C

Pro-Tips for Universal Integration

  • The “2-Volt” Rule: Always ensure your input voltage is at least 2V higher than your target output. For a 78L05, you need at least 7V input.

  • Polarity Check: Remember that the 78Lxx is for Positive voltages. If you are designing a dual-rail power supply and need a negative version, use the 79Lxx series (e.g., 79L05 for -5V).

  • Thermal Management: Even though they are “universal,” they are not for high power. If you try to drop 24V down to 5V at 100mA, the chip will get very hot (P = (Vin – Vout) \ I).

  • Capacitor Choice: Use ceramic capacitors (0.33μF on input, 0.1μF on output) to ensure the regulator doesn’t “whistle” (oscillate) at high frequencies.

Alternatives for 78Lxx

LM317L (Adjustable version), AMS1117 (LDO version), LP2950 (Low Quiescent), MCP1700

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AMS1117 Technical Reference: 1.2V to 5V Voltage Regulator {TL00001}

The AMS1117 series is one of the most popular low dropout (LDO) voltage regulators used in modern electronics. Known for its reliability and ease of use, it provides a stable power supply for everything from simple LED circuits to complex microcontrollers like the ESP32 or Arduino.

This guide explores the different varieties of the AMS1117, including fixed and adjustable versions across various packages.

Key Features of the AMS1117

  • High Efficiency Output: Delivers up to 1A of output current.

  • Low Dropout Performance: Operates with a typical dropout of only 1.1V to 1.3V at full load.

  • Thermal Protection: Features on-chip thermal limiting to shut down the regulator if it exceeds 165°C.

  • Short Circuit Safety: Built-in current limiting minimizes stress on your circuitry during overload conditions.

Voltage Varieties and Packages

The AMS1117 is available in two main formats: Fixed and Adjustable.

1. Fixed Voltage Models

These are pre-set to specific voltages, requiring no external resistors for operation:

  • AMS1117-1.2V: Perfect for low-voltage core logic.

  • AMS1117-1.5V: Used in specialized digital signaling.

  • AMS1117-1.8V: Standard for many FPGA and ARM processor cores.

  • AMS1117-2.5V: Common for networking and communication ICs.

  • AMS1117-3.3V: The most popular choice for powering 3.3V microcontrollers and WiFi modules.

  • AMS1117-5.0V: Standard for TTL logic and 5V digital systems.

2. The Adjustable Version (AMS1117-ADJ)

The ADJ version allows you to set a custom output voltage using two external resistors (R1 and R2). It develops a 1.25V reference voltage (Vref) between the output and adjust terminal.

The Full Adjustment Formula:

  • Vref: Reference Voltage (typically 1.25V).

  • R1: Resistor between OUT and ADJ pins (usually 120Ω).

  • R2: Resistor between ADJ pin and Ground.

  • Iadj: Adjustment pin current (typically a negligible 50uA).

  • ams1117 ciruit.jpgAMS1117 circuit2.jpg

3. Available Packages

Depending on your space and heat requirements, you can find the AMS1117 in several form factors:

  • SOT-223: The most common 3-lead surface mount package for hobbyist modules.

  • SOT-89: A smaller, low-profile version for compact mobile devices.

  • TO-252 (DPAK): A larger package that offers better heat dissipation for high-power applications.                                                                                                     

                                                                                                                    AMS1117 SOT-223 CAD Model 

    AMS1117 1A Low Dropout Voltage Regulator: Datasheet, 3.3 V Regulators and Pinout

                           AMS1117 TO-89 CAD Model                                        AMS1117 SOT-89 CAD Model

    PG-TO252-3-342 | Infineon TechnologiesPG-SOT89-4-2 | Infineon Technologies

Technical Specification Overview

Parameter Value
Max Input Voltage 15V (Absolute Maximum)
Output Current 1A
Reference Voltage (ADJ) 1.25V
Line Regulation 0.2% Max
Operating Temperature -40°C to 125°C

Pro-Tips for Stability

  1. Output Capacitors: The AMS1117 requires an output capacitor for stability. A 22μF solid tantalum capacitor is highly recommended to ensure it doesn’t oscillate under load.

  2. Heat Management: The tab of the SOT-223 package is electrically connected to the Output pin. Use a large copper area on your PCB to act as a heat sink, as the regulator dissipates heat through the board.

  3. Protection Diodes: Generally, protection diodes are not needed unless you are using very large output capacitors (above 1000μF) that could discharge back into the regulator.

 

Alternatives for AMS1117

LM1117, LM317, LM7805, NTE9060

 

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