3A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start - LP38859

LP38859 (ACTIVE)

3A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start

 

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Description

The LP38859 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 LP38859 is available in 5-pin TO-220 and DDPAK/TO-263 packages.

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • Input Voltage: 1.1 V to 5.5 V
  • Wide VBIAS Supply Operating Range: 3 V to 5.5 V
  • Standard VOUT Values: 0.8 V and 1.2 V
  • Stable With 10-µF Ceramic Capacitors
  • Dropout Voltage of 240 mV (typical) at 3-A Load Current
  • Programmable Soft-Start Time
  • Precision Output Voltage Across All Line and Load Conditions:
    • ±1% VOUT for TJ = 25°C
    • ±2% VOUT for 0°C ≤ TJ ≤ +125°C
    • ±3% VOUT for –40°C ≤ TJ ≤ +125°C
  • Overtemperature and Overcurrent Protection
  • Operating Temperature Range: −40°C to +125°C

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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
LP38859 LP38851 LP38852 LP38853 LP38855 LP38856 LP38858
3    0.8    1.5    3    1.5    3    1.5   
Fixed Output    Adjustable Output    Adjustable Output    Adjustable Output    Fixed Output    Fixed Output    Fixed Output   
1.15    0.915    0.93    1.04    0.98    1.15    0.98   
5.5    5.5    5.5    5.5    5.5    5.5    5.5   
0.8
1.2   
      0.8
1.2   
0.8
1.2   
1.2   
0.8    0.8    0.8    0.8    0.8    0.8    1.2   
1.2    1.8    1.8    1.8    1.2    1.2    1.2   
10    10    10    10    10    10    10   
350    115    130    240    130    240    180   
1    2    3    2    2    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 LP38859

  Min   Max Range
Vin  V 1.65 to 5.5V
Vout  V 1.2 to 1.2V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 125°C


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