3A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start - LP38853

LP38853 (ACTIVE)

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

 

Recommended alternative parts

  • LP38852  -  1.5A Version
  • LP38856  -  Fixed 0.8V & 1.2V, Enable Only
  • LP38859  -  Fixed 0.8V & 1.2V, Soft-start Only

Description

The LP38853 is a high-current, fast-response regulator that 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 NMOS power transistor; VIN is the input voltage which supplies power to the load. The use of an external bias rail allows the device 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 NMOS 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 and microcontroller core voltages, and switch-mode power-supply post regulators. Dropout Voltage: 240 mV (typical) at 3-A load current Low Ground Pin Current: 10 mA (typical) at 3-A load currentSoft Start: Programmable soft-start time

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

Features

  • Wide VBIAS Supply Operating Range: 3 V to 5.5 V
  • Adjustable VOUT Range: 0.8 V to 1.8 V
  • Dropout Voltage of 240 mV (Typical) at 3-A Load Current
  • Precision VADJ Across All Line and Load Conditions:
    • ±1.5% VADJ for TJ = 25°C
    • ±2% VADJ for 0°C ≤ TJ ≤ +125°C
    • ±3% VADJ for –40°C ≤ TJ ≤ +125°C
  • Overtemperature and Overcurrent Protection
  • Stable with 10-µF Ceramic Capacitors
  • −40°C to +125°C Operating Junction Temperature Range

View more

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
LP38853 LP38851 LP38852 LP38855 LP38856 LP38858 LP38859
3    0.8    1.5    1.5    3    1.5    3   
Adjustable Output    Adjustable Output    Adjustable Output    Fixed Output    Fixed Output    Fixed Output    Fixed Output   
1.04    0.915    0.93    0.98    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   
1.8    1.8    1.8    1.2    1.2    1.2    1.2   
10    10    10    10    10    10    10   
240    115    130    130    240    180    350   
2    2    3    2    1    1    1   
150    90    90    150    150    150    150   
35    50    35    37    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   
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   
5DDPAK/TO-263
5TO-220   

WEBENCH® Designer LP38853

  Min   Max Range
Vin  V 1.25 to 5.5V
Product Option
Vout  V
Iout  A ≤ 3.0A
Ambient Temp  °C -40.0 to 125.0°C