LP3856 3A Fast Ultra Low Dropout Linear Regulator | TI.com


3A Fast Ultra Low Dropout Linear Regulator



The LP3853/LP3856 series of fast ultra low-dropout linear regulators operate from a +2.5V to +7.0V input supply. Wide range of preset output voltage options are available. These ultra low dropout linear regulators respond very quickly to step changes in load, which makes them suitable for low voltage microprocessor applications. The LP3853/LP3856 are developed on a CMOS process which allows low quiescent current operation independent of output load current. This CMOS process also allows the LP3853/LP3856 to operate under extremely low dropout conditions.

Dropout Voltage: Ultra low dropout voltage; typically 39mV at 300mA load current and 390mV at 3A load current.

Ground Pin Current: Typically 4mA at 3A load current.

Shutdown Mode: Typically 10nA quiescent current when the shutdown pin is pulled low.

Error Flag:Error flag goes low when the output voltage drops 10% below nominal value.

SENSE: Sense pin improves regulation at remote loads.

Precision Output Voltage: Multiple output voltage options are available ranging from 1.8V to 5.0V with a ensured accuracy of ±1.5% at room temperature, and ±3.0% over all conditions (varying line, load, and temperature).


  • Ultra Low Dropout Voltage
  • Stable with Selected Ceramic Capacitors
  • Low Ground Pin Current
  • Load Regulation of 0.08%
  • 10nA Quiescent Current in Shutdown Mode
  • Ensured Output Current of 3A DC
  • Available in TO-263 and TO-220 Packages
  • Output Voltage Accuracy ± 1.5%
  • Error Flag Indicates Output Status
  • Sense Option Improves Load Regulation
  • Overtemperature/overcurrent Protection
  • −40°C to +125°C Junction Temperature Range

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Output options
Iout (Max) (A)
Vin (Max) (V)
Vin (Min) (V)
Vout (Max) (V)
Vout (Min) (V)
Fixed output options (V)
Package Group
Regulated outputs (#)
Operating temperature range (C)
Thermal Resistance θJA (°C/W)
Noise (uVrms)
Approx. price (US$)
Output capacitor type
Accuracy (%)
Vdo (Typ) (mV)
Iq (Typ) (mA)
Package size: mm2:W x L (PKG)
LP3856 LP3856-ADJ
Fixed Output     Adjustable Output    
3     3    
7     7    
2.5     2.5    
5     6.5    
1.8     1.23    
DDPAK/TO-263 | 5
TO-220 | 5    
DDPAK/TO-263 | 5
TO-220 | 5    
Enable     Enable    
1     1    
-40 to 125     -40 to 125    
50     50    
100     100    
2.16 | 1ku     3.18 | 1ku    
Catalog     Catalog    
Ceramic     Ceramic    
1.5     1.5    
390     390    
4     4    
5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
See datasheet (TO-220)    
5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
See datasheet (TO-220)