1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable - LP38855

LP38855 (ACTIVE)

1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable

 

Recommended alternative parts

  • LP38852  -  1.5A Adjustable Version
  • LP38853  -  3A Adjustable Version
  • LP38858  -  Fixed 0.8V & 1.2V With Soft-start

Description

The LP38855 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 LP38855 is available in TO-220 and DDPAK/TO-263 5-Lead packages.

Dropout Voltage: 130 mV (typical) at 1.5A load current.

Low Ground Pin Current: 10 mA (typical) at 1.5A load current.

Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low.

Precision Output Voltage: ±1.0% for TJ = 25°C and ±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions

Features

  • Standard VOUT Values of 0.8V and 1.2V
  • Wide VBIAS Supply Operating Range of 3.0V to 5.5V
  • Stable with 10 µF Ceramic Capacitors
  • Dropout Voltage of 130 mV (Typical) at 1.5A Load Current
  • Precision Output Voltage Across All Line and Load Conditions:
    • ±1.0% for TJ = 25°C
    • ±2.0% for 0°C ≤ TJ ≤ +125°C
    • ±3.0% for -40°C ≤ TJ ≤ +125°C
  • Over-Temperature and Over-Current Protection
  • Available in 5 Lead TO-220 and DDPAK/TO-263 Packages
  • Custom VOUT Values between 0.8V and 1.2V are Available
  • -40°C to +125°C Operating Temperature Range

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Parametrics Compare all products in Single Channel LDO

 
Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Fixed Output Options (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Vdo (Typ) (mV)
Accuracy (%)
Noise (uVrms)
PSRR @ 100KHz (dB)
Output Capacitor Type
Rating
Operating Temperature Range (C)
Pin/Package
LP38855 LP38851 LP38852 LP38853 LP38856 LP38858 LP38859
1.5    0.8    1.5    3    3    1.5    3   
Fixed Output    Adjustable Output    Adjustable Output    Adjustable Output    Fixed Output    Fixed Output    Fixed Output   
0.98    0.915    0.93    1.04    1.15    0.98    1.15   
5.5    5.5    5.5    5.5    5.5    5.5    5.5   
0.8
1.2   
      0.8
1.2   
1.2    0.8
1.2   
0.8    0.8    0.8    0.8    0.8    1.2    0.8   
1.2    1.8    1.8    1.8    1.2    1.2    1.2   
10    10    10    10    10    10    10   
130    115    130    240    240    180    350   
2    2    3    2    1    1    1   
150    90    90    150    150    150    150   
37    50    35    35    37    37    37   
Ceramic    Ceramic    Ceramic    Ceramic    Ceramic    Ceramic    Ceramic   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
5DDPAK/TO-263
5TO-220   
7DDPAK/TO-263
7TO-220
8SO PowerPAD   
7DDPAK/TO-263
7TO-220
8SO PowerPAD   
7DDPAK/TO-263
7TO-220
8SO PowerPAD   
5DDPAK/TO-263
5TO-220   
5DDPAK/TO-263
5TO-220   
5DDPAK/TO-263
5TO-220   
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WEBENCH® Designer LP38855

  Min   Max Range
Vin  V 0.98 to 5.5V
Vout  V 0.8 to 1.2V
Iout  A ≤ 1.5A
Ambient Temp  °C -40 to 125°C


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