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Numéro de sérieLP38500-ADJ
CategoriePower Management => Regulators => Linear Regulators => LDO (Low Drop Out)
Description1.5A FlexCap Low Dropout Linear Regulator For 2.7V To 5.5V Inputs
National\'s FlexCap LDO\'s feature unique compensation that allows the use of any type of output capacitor with no limits on minimum or maximum ESR. The LP38500/2 series of low-dropout linear regulators operates from a +2.7V to +5.5V input supply. These ultra low dropout linear regulators respond very quickly to step changes in load, which makes them suitable for low voltage microprocessor applications. Developed on a CMOS process, (utilizing a PMOS pass transistor), the LP38500/2 has low quiescent current that changes little with load current.
SociétéNational Semiconductor Corporation
DatasheetTélécharger LP38500-ADJ datasheet
 
 
  • Description courte

  • National's FlexCap LDO's feature unique compensation that allows the use of any type of output capacitor with no limits on minimum or maximum ESR. The LP38500/2 series of lowdropout linear regulators operates from to +5.5V input supply. These ultra low dropout linear regulators respond very quickly to step changes in load, which makes them suitable for low voltage microprocessor applications. Developed on a CMOS process, (utilizing a PMOS pass transistor), the LP38500/2 has low quiescent current that changes little with load current. Ground Pin Current: Typically at 1.5A load current. Disable Mode: Typically 25 nA quiescent current when the Enable pin is pulled low. Simplified Compensation: Stable with any type of output capacitor, regardless of ESR. Precision Output: "A" grade versions available with 1.5% VADJ tolerance (25°C) and 3% over line, load and temperature.

    Features
    FlexCap: Stable with ceramic, tantalum, or aluminum

    capacitors Stable with 10 µF input/output capacitor Adjustable output voltage from to 5V Low ground pin current 25 nA quiescent current in shutdown mode Guaranteed output current of 1.5A Available TO-263, TO-263 THIN, and LLP-8 packages Guaranteed VADJ accuracy 25°C (A Grade) Guaranteed accuracy @ 25°C (STD) Over-Temperature and Over-Current protection to +125°C operating TJ range Enable pin (LP38502)

    Applications

    Printers, Graphics Cards, DVD Players Set Top Boxes, Copiers, Routers DSP and FPGA Power Supplies SMPS Regulator Conversion from or 5V Rail

    Pin # Designation EN 1 N/C IN GND OUT ADJ Function Enable (LP38502 only). Pull high to enable the output, low to disable the output. This pin has no internal bias and must be either tied to the input voltage, or actively driven. In the LP38500, this pin has no internal connections. It can be left floating or used for trace routing. Input Supply Ground Regulated Output Voltage Sets output voltage The DAP is used to remove heat from the device by conducting it to the copper clad area on the PCB which acts as the heatsink. The DAP is electrically connected to the backside of the die. The DAP must be connected to ground potential, but can not be used as the only ground connection.

    Pin # 1 Designation GND EN IN OUT ADJ Function Ground Input Supply (LP38500 only). Input Supply pins share current and must be connected together on the PC Board. Enable (LP38502 only). Pull high to enable the output, low to disable the output. This pin has no internal bias and must be either tied to the input voltage, or actively driven. Input Supply. Input Supply pins share current and must be connected together on the PC Board. Regulated Output Voltage. Output pins share current and must be connected together on the PC Board. Sets output voltage The DAP is used to remove heat from the device by conducting to a copper clad area on the PCB which acts as a heatsink. The DAP is electrically connected to the backside of the die. The DAP must be connected to ground potential, but can not be used as the only ground connection.

    TABLE 1. Package Marking and Ordering Information Output Voltage Order Number LP38500SD-ADJ LP38502SDX-ADJ ADJ LP38502ASD-ADJ LP38500TSX-ADJ ADJ LP38502TS-ADJ LP38500TJ-ADJ ADJ LP38502ATJ-ADJ TO-263 THIN TO-263 LLP-8 Package Type Package Marking LP38500ATJ-ADJ LP38502ATJ-ADJ Supplied As: Tape and Reel of 4500 Units Tape and Reel of 1000 Units Tape and Reel of 4500 Units Tape and Reel of 1000 Units Tape and Reel of 4500 Units Tape and Reel of 1000 Units Tape and Reel of 4500 Units Tape and Reel of 1000 Units Tape and Reel of 500 Units Rail of 45 Units Tape and Reel of 500 Units Rail of 45 Units Tape and Reel of 1000 Units Tape and Reel of 1000 Units Tape and Reel of 1000 Units Tape and Reel of 1000 Units