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Linear- und Low-Dropout-Regler (LDO)

LP38856

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Hochgenauer Ultra-Low-Dropout-Spannungsregler, 3 A, niedrige VIN (1,15 V) mit Aktivierung

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LP38856

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Produktdetails

Output options Fixed Output Iout (max) (A) 3 Vin (max) (V) 5.5 Vin (min) (V) 1.15 Vout (max) (V) 1.2 Vout (min) (V) 0.8 Fixed output options (V) 1.2 Noise (µVrms) 150 Iq (typ) (mA) 10 Thermal resistance θJA (°C/W) 32 Rating Catalog Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Features Enable Accuracy (%) 1 PSRR at 100 KHz (dB) 37 Dropout voltage (Vdo) (typ) (mV) 240 Operating temperature range (°C) -40 to 125
Output options Fixed Output Iout (max) (A) 3 Vin (max) (V) 5.5 Vin (min) (V) 1.15 Vout (max) (V) 1.2 Vout (min) (V) 0.8 Fixed output options (V) 1.2 Noise (µVrms) 150 Iq (typ) (mA) 10 Thermal resistance θJA (°C/W) 32 Rating Catalog Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Features Enable Accuracy (%) 1 PSRR at 100 KHz (dB) 37 Dropout voltage (Vdo) (typ) (mV) 240 Operating temperature range (°C) -40 to 125
TO-220 (NDH) 5 86.0552 mm² 10.16 x 8.47 TO-263 (KTT) 5 154.8384 mm² 10.16 x 15.24
  • Input Voltage: 1.1 V to 5.5 V
  • Wide VBIAS Supply Operating
    Range: 3 V to 5.5 V
  • Standard VOUT: 0.8 V and 1.2 V
  • Stable with 10-µF Ceramic Capacitors
  • Dropout Voltage of 240 mV (Typical) at 3-A
    Load Current
  • Precision Output Voltage Across All Line and
    Load Conditions:
    • ±1% for TJ = 25°C
    • ±2% for 0°C ≤ TJ ≤ +125°C
    • ±3% for –40°C ≤ TJ ≤ +125°C
  • Overtemperature and Overcurrent Protection
  • –40°C to +125°C Operating Temperature Range
  • Input Voltage: 1.1 V to 5.5 V
  • Wide VBIAS Supply Operating
    Range: 3 V to 5.5 V
  • Standard VOUT: 0.8 V and 1.2 V
  • Stable with 10-µF Ceramic Capacitors
  • Dropout Voltage of 240 mV (Typical) at 3-A
    Load Current
  • Precision Output Voltage Across All Line and
    Load Conditions:
    • ±1% for TJ = 25°C
    • ±2% for 0°C ≤ TJ ≤ +125°C
    • ±3% for –40°C ≤ TJ ≤ +125°C
  • Overtemperature and Overcurrent Protection
  • –40°C to +125°C Operating Temperature Range

The LP38856 is a high-current, fast-response regulator which can maintain output voltage regulation with an extremely low input-to-output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides power for the internal bias and control circuits, as well as drive for the gate of the N-MOS power transistor, while VIN supplies power to the load. The use of an external bias rail allows the part to operate from ultra-low VIN voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.

The fast transient response of this device makes it suitable for use in powering DSP, microcontroller core voltages, and switch mode power supply post regulators. The LP38856 is available in 5-pin TO-220 and DDPAK/TO-263 packages.

  • Dropout Voltage: 240 mV (typical) at 3-A load current.
  • Low Ground Pin Current: 10 mA (typical) at 3-A load current.
  • Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low.
  • Precision Output Voltage: ±1% for TJ = 25°C and ±2% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions.

The LP38856 is a high-current, fast-response regulator which can maintain output voltage regulation with an extremely low input-to-output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides power for the internal bias and control circuits, as well as drive for the gate of the N-MOS power transistor, while VIN supplies power to the load. The use of an external bias rail allows the part to operate from ultra-low VIN voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.

The fast transient response of this device makes it suitable for use in powering DSP, microcontroller core voltages, and switch mode power supply post regulators. The LP38856 is available in 5-pin TO-220 and DDPAK/TO-263 packages.

  • Dropout Voltage: 240 mV (typical) at 3-A load current.
  • Low Ground Pin Current: 10 mA (typical) at 3-A load current.
  • Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low.
  • Precision Output Voltage: ±1% for TJ = 25°C and ±2% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions.
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Technische Dokumentation

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Typ Titel Datum
* Data sheet LP38856 3-A Fast-Response High-Accuracy LDO Linear Regulator With Enable datasheet (Rev. F) PDF | HTML 27 Aug 2015
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mär 2018
EVM User's guide AN-1479 LP38856S-1.2 Evaluation Board (Rev. B) 24 Apr 2013

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