LP3891 0.8A Fast-Response Ultra Low Dropout Linear Regulators | TI.com

LP3891
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
0.8A Fast-Response Ultra Low Dropout Linear Regulators

 

Recommended alternative parts

  • LP3881  -  Has Less Than Half The Dropout Voltage
  • LP38841  -  Vout Down To 0.56V, Vin Down To 1.05V
  • LP3892  -  1.5A Version

Description

The LP3891 is a high current, fast response regulator which can maintain output voltage regulation with minimum 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 these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220, DDPAK/TO-263 and SO PowerPAD-8 packages.

Dropout Voltage: 100 mV (typ) at 0.8A load current.

Ground Pin Current: 3 mA (typ) at full load.

Shutdown Current: 60 nA (typ) when S/D pin is low.

Precision Output Voltage: 1.5% room temperature accuracy.

Features

  • Ultra Low Dropout Voltage (100mV at 0.8A typ)
  • Low Ground Pin Current
  • Load Regulation of 0.04%/A
  • 60 nA Typical Quiescent Current in Shutdown
  • 1.5% Output Accuracy (25°C)
  • TO-220, DDPAK/TO-263 and SO PowerPAD-8 Packages
  • Over Temperature/Over Current Protection
  • −40°C to +125°C Junction Temperature Range

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Parametrics

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Part number Order Output options Iout (Max) (A) Vin (Max) (V) Vin (Min) (V) Vout (Max) (V) Vout (Min) (V) Fixed output options (V) Package Group Features Regulated outputs (#) Operating temperature range (C) Thermal resistance θJA (°C/W) Noise (uVrms) Approx. price (US$) Rating PSRR @ 100 KHz (dB) Accuracy (%) Dropout voltage (Vdo) (Typ) (mV) Iq (Typ) (mA) Package size: mm2:W x L (PKG)
LP3891 Order now Fixed Output     0.8     5.5     1.3     1.8     1.2     1.2
1.5
1.8    
DDPAK/TO-263 | 5
SO PowerPAD | 8    
Enable     1     -40 to 125     40     150     1.42 | 1ku     Catalog     30     2     100     4     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LP3881 Samples not available Fixed Output     0.8     5.5     1.291     1.8     1.2     1.2
1.5
1.8    
DDPAK/TO-263 | 5     Enable     1     -40 to 125     40     90     2.22 | 1ku     Catalog     45     2     75     4     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)    
LP3882 Order now Fixed Output     1.5     5.5     1.31     1.8     1.2     1.2
1.5
1.8    
DDPAK/TO-263 | 5
SO PowerPAD | 8    
    1     -40 to 125     40     90     2.22 | 1ku     Catalog     45     2     110     4     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LP3883 Order now Fixed Output     3     5.5     1.426     1.5     1.2     1.2
1.5    
DDPAK/TO-263 | 5     Enable     1     -40 to 125     40     90     2.73 | 1ku     Catalog     30     3     210     4     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)    
LP38841 Order now Fixed Output     0.8     5.5