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LP38851

ACTIVE

800-mA, low-VIN (0.915-V), adjustable ultra-low-dropout voltage regulator with enable

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Data sheet

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TPS74801 ACTIVE 1.5-A low-VIN (0.8 V) adjustable low-dropout (LDO) voltage regulator with power good and enable Higher current with improved PSRR and accuracy

LP38851

ACTIVE
Data sheet Order now

Product details

Output options Adjustable Output Iout (max) (A) 0.8 Vin (max) (V) 5.5 Vin (min) (V) 0.915 Vout (max) (V) 1.8 Vout (min) (V) 0.8 Rating Catalog Noise (µVrms) 90 PSRR at 100 KHz (dB) 50 Iq (typ) (mA) 10 Thermal resistance θJA (°C/W) 60 Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Features Enable, Soft start Accuracy (%) 2 Dropout voltage (Vdo) (typ) (mV) 115 Operating temperature range (°C) -40 to 125
Output options Adjustable Output Iout (max) (A) 0.8 Vin (max) (V) 5.5 Vin (min) (V) 0.915 Vout (max) (V) 1.8 Vout (min) (V) 0.8 Rating Catalog Noise (µVrms) 90 PSRR at 100 KHz (dB) 50 Iq (typ) (mA) 10 Thermal resistance θJA (°C/W) 60 Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Features Enable, Soft start Accuracy (%) 2 Dropout voltage (Vdo) (typ) (mV) 115 Operating temperature range (°C) -40 to 125
HSOIC (DDA) 8 29.4 mm² 4.9 x 6 TO-220 (NDZ) 7 82.6008 mm² 10.16 x 8.13 TO-263 (KTW) 7 153.924 mm² 10.1 x 15.24
  • Adjustable VOUT Range of 0.80V to 1.8V
  • Wide VBIAS Supply Operating Range of 3.0V to 5.5V
  • Stable with 10µF Ceramic Capacitors
  • Dropout Voltage of 115 mV (Typical) at 800 mA Load Current
  • Precision VADJ across All Line and Load Conditions:
    • ±1.5% VADJ for TJ = 25°C
    • ±2.0% VADJ for 0°C ≤ TJ ≤ +125°C
    • ±3.0% VADJ for -40°C ≤ TJ ≤ +125°C
  • Over-Temperature and Over-Current Protection
  • Available in 8-Lead SO PowerPad,
    7-Lead SFM and 7-Lead PFM Packages
  • −40°C to +125°C Operating Junction Temperature Range

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  • Adjustable VOUT Range of 0.80V to 1.8V
  • Wide VBIAS Supply Operating Range of 3.0V to 5.5V
  • Stable with 10µF Ceramic Capacitors
  • Dropout Voltage of 115 mV (Typical) at 800 mA Load Current
  • Precision VADJ across All Line and Load Conditions:
    • ±1.5% VADJ for TJ = 25°C
    • ±2.0% VADJ for 0°C ≤ TJ ≤ +125°C
    • ±3.0% VADJ for -40°C ≤ TJ ≤ +125°C
  • Over-Temperature and Over-Current Protection
  • Available in 8-Lead SO PowerPad,
    7-Lead SFM and 7-Lead PFM Packages
  • −40°C to +125°C Operating Junction Temperature Range

All trademarks are the property of their respective owners.

The LP38851-ADJ is a high current, fast response regulator which can maintain output voltage regulation with extremely low input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides voltage to drive the gate of the N-MOS power transistor, while VIN is the input voltage which 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 part is available in PSOP 8–pin, SFM 7–pin, and TO-263 7-pin packages.

  • Dropout Voltage: 115 mV (typical) at 800 mA load current
  • Low Ground Pin Current: 10 mA (typical) at 800 mA load current
  • Soft-Start: Programmable Soft-Start time
  • Precision ADJ Voltage: ±1.5% for TJ = 25°C, and ±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions

The LP38851-ADJ is a high current, fast response regulator which can maintain output voltage regulation with extremely low input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides voltage to drive the gate of the N-MOS power transistor, while VIN is the input voltage which 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 part is available in PSOP 8–pin, SFM 7–pin, and TO-263 7-pin packages.

  • Dropout Voltage: 115 mV (typical) at 800 mA load current
  • Low Ground Pin Current: 10 mA (typical) at 800 mA load current
  • Soft-Start: Programmable Soft-Start time
  • Precision ADJ Voltage: ±1.5% for TJ = 25°C, and ±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions
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Technical documentation

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Type Title Date
* Data sheet 800 mA Fast-Response High-Accuracy Adj LDO Linear Reg w/ Enable & Soft-Start datasheet (Rev. C) 05 Apr 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mar 2018
Application note AN-1815 LDOs Ease the Stress of Start-Up (Rev. A) 24 Apr 2013

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HSOIC (DDA) 8 Ultra Librarian
TO-220 (NDZ) 7 Ultra Librarian
TO-263 (KTW) 7 Ultra Librarian
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