LP38856 3A Fast-Response High-Accuracy LDO Linear Regulator with Enable | TI.com

LP38856 (ACTIVE)

3A Fast-Response High-Accuracy LDO Linear Regulator with Enable

 

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Description

The LP38856 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 LP38856 is available in 5-pin TO-220 and DDPAK/TO-263 packages.

  • Dropout Voltage: 240 mV (typical) at 3-A load current.
  • Low Ground Pin Current: 10 mA (typical) at 3-A load current.
  • Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low.
  • Precision Output Voltage: ±1% for TJ = 25°C and ±2% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions.

Features

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

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Parametrics Compare all products in Linear regulators (LDO)

 
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
Output capacitor type
PSRR @ 100 KHz (dB)
Accuracy (%)
Vdo (Typ) (mV)
Iq (Typ) (mA)
Package size: mm2:W x L (PKG)
LP38856 LP38851 LP38852 LP38853 LP38855 LP38858 LP38859
Fixed Output     Adjustable Output     Adjustable Output     Adjustable Output     Fixed Output     Fixed Output     Fixed Output    
3     0.8     1.5     3     1.5     1.5     3    
5.5     5.5     5.5     5.5     5.5     5.5     5.5    
1.15     0.915     0.93     1.04     0.98     0.98     1.15    
1.2     1.8     1.8     1.8     1.2     1.2     1.2    
0.8     0.8     0.8     0.8     0.8     1.2     0.8    
0.8
1.2    
      0.8
1.2    
1.2     0.8
1.2    
DDPAK/TO-263 | 5
TO-220 | 5    
DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
DDPAK/TO-263 | 5
TO-220 | 5    
DDPAK/TO-263 | 5
TO-220 | 5    
DDPAK/TO-263 | 5
TO-220 | 5    
Enable     Enable
Soft Start    
Enable
Soft Start    
Enable
Soft Start    
Enable     Soft Start     Soft Start    
1     1     1     1     1     1     1    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
32     60     34     34     60     60     43    
150     90     90     150     150     150     150    
1.82 | 1ku     0.81 | 1ku     1.19 | 1ku     1.88 | 1ku     0.97 | 1ku     0.97 | 1ku     1.82 | 1ku    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
Ceramic     Ceramic     Ceramic     Ceramic     Ceramic     Ceramic     Ceramic    
37     50     35     35     37     37     37    
1     2     3     2     2     1