LD39150PT-R

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1. Description

The LD39150PT-R is a fast ultra low drop linear regulator which operates from 2.5 V to 6 V input supply. A wide range of output options are available. The low drop voltage, low noise, and ultra low quiescent current make it suitable for low voltage microprocessor and memory applications. The device is developed on a BiCMOS process which allows low quiescent current operation independently of output load current.

2. Features

    1. 1.5 A guaranteed output current

    2. Ultra low dropout voltage (200 mV typ. @ 1.5 A load, 40 mV typ. @ 300 mA load)

    3. Very low quiescent current (1 mA typ. @ 1.5 A load, 1 µA max @ 25 °C in off mode)

    4. Logic-controlled electronic shutdown

    5. Current and thermal internal limit

    6. ±1.5% output voltage tolerance @ 25 °C

    7. Fixed and ADJ output voltages: 1.8 V, 2.5 V, 3.3 V, ADJ

    8. Temperature range: -40 to 125 °C

    9. Fast dynamic response to line and load changes

  10. Stable with ceramic capacitor

  11. Available in PPAK, DPAK and DFN6 (3x3 mm)

3. Applications

    1. Microprocessor power supply

    2. DSPs power supply

    3. Post regulators for switching suppliers

    4. High efficiency linear regulator

4. Pin configuration

5. Pin description

6. Application note

1. External capacitor

LD39150 requires an external capacitor to ensure the stability of the regulator. These capacitors must To meet the minimum capacitance and equivalent series resistance requirements. Input/output capacitors must be located less than 1cm From the relevant pin and use the trace to connect directly to the input/output ground pin No other current flows through them.

2. Input capacitance

LD39150 requires an input capacitor with a minimum value of 1 µF (the quantity is The capacitance can be increased without limit). The capacitor must be located Be more than 1 cm away from the input pins of the device and return to a clean analog ground. any This capacitor can use high-quality ceramic, tantalum or film capacitors.

3. Output capacitor

Ceramic or tantalum capacitors can be used, but the output capacitor must meet Minimum capacitance and ESR (Equivalent Series Resistance) requirements value. The minimum capacitance of 2.2 µF is a good choice to ensure stability Regulator. In any case, other CO values can be used according to The allowable ESR range as a function of output capacitance is shown. This curve Represents the stable area within the entire temperature and IO range.

4. Keep warm notes

The output capacitor must keep its ESR in a stable region during the entire working period Temperature range to ensure stability. In addition, the tolerance and variation of the capacitor The temperature must be considered to ensure a minimum There are capacitors at all times.

5. Prohibit input operation

The inhibit pin can be used to turn off the regulator when it is pulled down, so sharply Reduce current consumption to less than 1 µA. When the prohibition function is not To use, this pin must be connected to VI To keep the regulator output on at all times. guarantee For proper operation, the signal source used to drive the inhibit pin must be able to swing on it And it is below the specified threshold listed in the electrical characteristics section (VIH VIL). The prohibit pin cannot be left floating because it is not an internal pull-down/pull-up.