LP38855 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable | TI.com

LP38855 (ACTIVE) 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable

 

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Description

The LP38855 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 LP38855 is available in TO-220 and DDPAK/TO-263 5-Lead packages.

Dropout Voltage: 130 mV (typical) at 1.5A load current.

Low Ground Pin Current: 10 mA (typical) at 1.5A load current.

Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low.

Precision Output Voltage: ±1.0% for TJ = 25°C and ±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions

Features

  • Standard VOUT Values of 0.8V and 1.2V
  • Wide VBIAS Supply Operating Range of 3.0V to 5.5V
  • Stable with 10 µF Ceramic Capacitors
  • Dropout Voltage of 130 mV (Typical) at 1.5A Load Current
  • Precision Output Voltage Across All Line and Load Conditions:
    • ±1.0% for TJ = 25°C
    • ±2.0% for 0°C ≤ TJ ≤ +125°C
    • ±3.0% for -40°C ≤ TJ ≤ +125°C
  • Over-Temperature and Over-Current Protection
  • Available in 5 Lead TO-220 and DDPAK/TO-263 Packages
  • Custom VOUT Values between 0.8V and 1.2V are Available
  • -40°C to +125°C Operating Temperature Range

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  Min   Max Range
Vin  V 0.98 to 5.5V
Vout  V 0.8 to 1.2V
Iout  A ≤ 1.5A
Ambient Temp  °C -40 to 125°C

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)
LP38855 Order now Fixed Output     1.5     5.5     0.98     1.2     0.8     0.8
1.2    
DDPAK/TO-263 | 5
TO-220 | 5    
Enable     1     -40 to 125     60     150     0.97 | 1ku     Catalog     37     2     130     10     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
See datasheet (TO-220)    
LP38851 Order now Adjustable Output     0.8     5.5     0.915     1.8     0.8       DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
Enable
Soft Start    
1     -40 to 125     60     90     0.81 | 1ku     Catalog     50     2     115     10     7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
See datasheet (TO-220)    
LP38852 Order now Adjustable Output     1.5     5.5     0.93     1.8     0.8       DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
Enable
Soft Start    
1     -40 to 125     34     90     1.19 | 1ku     Catalog     35     3     130     10     7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
See datasheet (TO-220)    
LP38853 Order now Adjustable Output     3     5.5     1.04     1.8     0.8       DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
Enable
Soft Start    
1     -40 to 125     34     150     1.88 | 1ku     Catalog     35     2     240     10     7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
See datasheet (TO-220)    
LP38856 Order now Fixed Output     3