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Low Dropout Regulators (LDOs)

Linear & Low Dropout (LDO) Regulators Featuring the LP38xxx Family

National's LDOs featuring the LP38xxx family provide ultra-low dropouts that enable regulation for small voltage conversions with leading high-accuracy, fast transient response, and excellent line and load regulation at sub 1V output voltages for Digital ICs such as FPGAs, low-output noise and high PSRR for RF applications, and Low Quiescent current (IQ) for portable applications.

National's LDOs are widely used for:

  • Ease-of-use
  • Small physical size
  
  • Low noise operation
  • Cost effectiveness

 

LDO Parametric Tables Negative Multi-Output Flex Cap Fast Transient Response Low IQ Wide VIN Low Input Low Output Low Noise  

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Low Noise LDOs for Low-Power, Space-Constrained Applications 

Ideal for ultra low noise applications
Generate low noise rails to power up op-amps, ADCs

 

Product ID Output Current (mA) Input Max Voltage (V) Input Min Voltage (V) Dropout Voltage (V) Output Voltage (V) Adjustable Output On/Off Pin Quiescent Current (mA) PSRR (dB) Voltage Noise (µV rms)
150 6 2.5 0.06 3, 2.8, 1.9 — — 0.085 60 25
 		 150 6 2.5 0.06 1.5, 2.4, 1.8, 2.5, 2.8, 3.3 — — 0.085 60 30
 		 150 5.5 2.5 0.08 1.5, 2.8, 3.3 — — 0.025 75 6.5
200 5.5 2.2 0.15 0.8 to 3.6 — — 0.03 55 60
 		 250 6 2 0.14 3.3 — — 0.055 61 100
800 7 2.5 0.24 5, 1.8, 2.5, 3.3 Y Y 6 73 150
800 16 2.5 0.475 Adj Y Y 0.18 60 18
800 6 2.5 — 1.2, 1 — Y 0.1 60 18
1500 7 2.5 0.38 5, 1.8, 2.5, 3.3 Y Y 6 73 150
3000 7 2.5 0.8 5, 1.8, 2.5, 3.3 Y Y 6 73 150

 

Low Input/Low Output LDOs 

Ideal for powering Digital IC's

 

Product ID Output Current (mA) Input Max Voltage (V) Input Min Voltage (V) Dropout Voltage (V) Output Voltage (V) On/Off Pin Package
150 6 2 0.06 1.5, 3.8, 1.8, 2.5, 0.8, 1.35, 2.8, 1.2, 3.3 Y SOT23-5, micro SMD-4, LLP-6
150 5.5 1.8 0.2 2.0, 1.5, 3.0, 1.8, 1.3, 2.5, 2.8, 3.3 Y SOT23-5,
SC70-5
300 3.6 1.65 0.075 1.5, 1.3, 2.8, 1.2 Y micro SMD-4
350 4.5 0.9 0.088, 0.128 2.0, 1.6, 1.5, 0.7, 1.8, 1.3, 1.0,  1.2, 1.2, 1.4 Y micro SMD-5
800 6 1.575, 1.875, 1.275 0.075 1.8 Y TO-263-5, TO-220-5, PSOP-8
800 5.5 0.875, 1.575, 1.275, Adj 0.075 1.5, 0.8, 1.2, Adj — TO-263-5, TO-220-5
800 5.5 1.6, 1.3, 1.9 0.1 1.5, 1.8, 1.2 Y TO-263-5, TO-220-5, PSOP-8
1500 6 1.61, 1.31, 1.91 0.11 1.8 Y TO-263-5, TO-220-5, PSOP-8
1500 5.5 0.915, 1.315, 1.615, Adj 0.115 1.5, 0.8, 1.2, Adj — TO-263-5, TO-220-5
1500 5.5 1.94, 1.64, 1.34 0.14 1.5, 1.8, 1.2 Y TO-263-5, TO-220-5, PSOP-8
1500 7 2.5 0.24 5, 1.8, 2.5, 3.3, Adj Y TO-263-5, SOT-223-5, TO-220-5
3000 5.5 1.71, 2.01, 1.41 0.21 1.5, 1.8, 1.2 Y TO-263-5, TO-220-5
3000 5.5 1.01, 1.71, 1.41 0.21 1.5, 0.8, 1.2 — TO-263-5, TO-220-5
3000 5.5 1.47, 1.77, 2.07 0.27 1.5, 1.8, 1.2 Y TO-263-5, TO-220-5
3000 7 2.5 0.39 5| 1.8| 2.5| 3.3 Y TO-263-5, TO-220-5

 

Product ID Load Current (V) VOUT Options (V) Adj. Output Enable Pin Soft-Start Pin Typical Dropout (mV) Packaging
0.8 ADJ 0.8 to 1.8 Y Y Y 115 PSOP-8,
TO263-7
1.5 0.8V, 1.2 — — Y 180 TO263-5,
TO220-5
1.5 0.8V, 1.2 — Y — 180 TO263-5,
TO220-5
1.5 ADJ 0.8 to 1.8 Y Y Y 180 PSOP-8,
TO263-7
3 0.8V, 1.2 — — Y 450 TO263-5,
TO220-5
3 0.8V, 1.2 — Y — 450 TO263-5,
TO220-5
3 ADJ 0.8 to 1.8 Y Y Y 450 PSOP-8,
TO263-7

 

Wide Input Voltage LDOs 

Ideal for High Voltage inputs such as automotive/industrial applications

 

Product ID Load (mA) Vin Max (V) VIN Min (V) Dropout Voltage) Enable Pin VOUT Package
50 16 2.1 0.12 Y 4.7, 3, 3.6, 2.5, 3.2, 2.9, 2.6, 3.3, 3.5, 3.8, 5, 2.7, 3.1, 4.5, 4, 2.8 SOT-23-5
50 16 5.42, 2.72, 4.62, 2.92, 5.12, 4.82, 2.62, 3.42, 3.12, 4.12, 3.92, 3.72 0.12 Y 4.7, 3.8, 3, 5, 3.6, 5.3, 2.5, 4.5, 4, 2.8, 2.6, 3.3 SOT-23-5
50 40 3.3 0.4 Y    
50 60 3.3 0.4 Y    
50 40 3.7 0.4 Y    
50 26   0.6 Y    
100 16 3, 3.2, 2.9, 3.3, 3.5, 3.8, 4.9, 2.7, 3.4, 3.1, 4, 4.2, 5.2 0.2 Y 4.7, 3, 3.6, 2.5, 3.2, 2.9, 3.3, 3.8, 2.7, 5, 3.1, 4, 2.8 SOT-23-5
150 26   0.6 —    
150 26   0.6 —    
150 52   0.4 Y    
150 16 2.2 1.3, 1, 1.2 Y 0.9, 1.2, 1, 3.3 SOT-23-5
150 16 2.2 0.28 Y 3.0, 2.85, 3.3 SOT-23-5, uSMD-5
150 16 2.5 0.28 Y 3, 3.6, 2.5, 3.2, 6.1, 2.9, 2.6, 3.3, 3.8, 3.5, 2.4, 5, 2.7, 3.1, 4.5, 4, 2.8 SOT-23-5, uSMD-5
200 16 2.1 0.18 Y 3, 5, 3.3 MSOP-8, LLP-8, SOIC NARROW-8
200 16 3.98, 3.38, 2.1, 2.98 0.18 Y 3.8, 3, 5, 3.2, 2.8, 3.3 MSOP-8, LLP-8, SOIC NARROW-8
200 16 3.98, 2.1, 2.98 0.18 Y 5.7, 3.8, 3, 2.7, 5, 3.2, 2.8, 3.3 MSOP-8, LLP-8, SOIC NARROW-8
250 26 5.3 0.8 Y    
250 26 5.3 0.8 Y    
250 30   0.6 Y    
250 30   0.6 Y    
250 30   0.6 Y    
250 30   0.6 Y    
250 16 2.5 0.45 Y 1.5, 5, 1.8, 2.5, 3.3 SOT-23-5, LLP-6
500 16 5.31, 3.11, 2.81, 3.61 0.31 Y 3, 5, 3.6, 2.5, 4, 2.85, 2.8, 3.3 MSOP-8, LLP-8, SOIC NARROW-8
500 16 2.1 0.31 Y 1.8 MSOP-8, LLP-8, SOIC NARROW-8
500 10 2.7 0.25 — 1.8, 2.5, 3.3, 5 SOT223-5, LLP-6
500 10 2.7 0.25 Y 1.8, 2.5, 3.3, 5 SOT223-5, LLP-6
800 16 2.5 0.475 Y adj LLP-8, PSOP-8
1000 26   0.7 —    
1000 26   0.8 Y    
1000 0.3 -26 0.6 Y — TO-263-3, TO-220-3
1000 10 2.7 0.45 — 1.8, 2.5, 3.3, 5 SOT223-5, LLP-6
1000 10 2.7 0.45 Y 1.8, 2.5, 3.3, 5 SOT223-5, LLP-6
1500 0.3 -26 0.6 —  -5.2, -5, -12, -15 TO-263-3, TO-220-3
Note1 24 1.8 — Y 12, 3.3, 5 MSOP-8

 

Low IQ LDOs 

Ideal for portable, battery powered applications

 

Product ID Output Current (mA) Input Max Voltage (V) Input Min Voltage (V) Dropout Voltage (V) Quiescent Current (mA) On/Off Pin Output Voltage (V) Package
5 6 2.7, 2.5 — 0.014 Y 1.6, 1.8, 2.5 micro SMD-5
30 5.2 1.9 — 0.026 Y 1.5 SOT23-5
150 6 3.8, 3, 2, 2.3, 3.3 0.06 0.043 Y 1.5, 3.8, 1.8, 2.5, 0.8, 1.35, 2.8, 1.2, 3.3 micro SMD-4, SOT23-5, LLP-6
150 6 2.5 0.06 0.08 Y 1.5, 1.8, 3.1, 2 micro SMD-4, SOT23-5
150 6 2.5 0.06 0.085 Y 4.7, 3, 5, 2.7, 3.2, 2.5, 3.1, 2.9, 2.8, 2.6, 3.3 micro SMD-5, SOT23-5
150 6.5, 6 3, 3.05, 2.8 0.06 0.085 Y 2.8, 2.85, 2.6 micro SMD-5
150 6 2.7, 3.2, 3.1, 2.8 0.08 0.085 Y 3, 2.5, 2.85, 2.6 micro SMD-5, SOT23-5
300 3.6 1.65 0.075, Undefined 0.05 Y 1.5, 1.3, 2.8, 1.2 micro SMD-4
300 6 2.7 0.132 0.07 Y 2.83, 2.7, 2.5, 3.03, 2.8, 3.3 LLP-6, MSOP-8
300 6 2.5 0.12 0.09 Y 2.77, 3, 1.8, 2.5, 2.82, 3.3 LLP-8, MSOP-8

 

LP3851x - Fast Transient Response LDO family 

Provides ultra fast response and low drop out

 

Product ID Load Current (A) VIN Min (V) VIN Max (V) VOUT (V) Error Flag Enable Packaging
0.8 2.25 5.5 1.8V ADJ down to 0.8V Y — TO263-5
1.5 2.25 5.5 1.8V ADJ down to 0.8V Y Y TO263-, LLP-8
3 2.25 5.5 1.8V ADJ down to 0.8V Y Y TO263-5

 

LP3850x - FlexCap LDO Family 

Provides Flexibility and Simplicity
Stable with any type of capacitors: Tantalum, ceramic, electrolytic, etc.

 

Product ID Load Current (A) VIN Min (V) VIN Max (V) VOUT (V) Typical Dropout (mV) Enable Packaging
3 2.7 5.5 ADJ down to 0.6 450m — TO263-5
1.5 2.7 5.5 ADJ down to 0.6 220m Y TO263-, LLP-8
3 2.7 5.5 ADJ down to 0.6 450m Y TO263-5
1.5 2.7 5.5 ADJ down to 0.6 220m — TO263-5, LLP-8

 

Multi-Output LDOs 

Product ID Input Max Voltage (V) Input Min Voltage (V) Output1 VOUTMin Output2 VOUTMin Output1 IOUTMax Output2 IOUTMax Dropout Voltage (V) Quiescent Current (mA) Error Flag Power on Reset
7 2.7 1.8 1.8 150 150 0.135 0.34 Y —
16 2.1 1.8 2.5 150 150 0.275 0.34 — Y
6 2.5 2.5 2.8 300 150 0.06 0.075 — —
6 2 0.8 0.8 150 300 0.21 0.07 Y Y
6 2 0.8 0.8 150 300 0.21 0.07 — —
5.5 1.8 2.7 1.8 280 280 0.11 90 — —

 

Negative LDOs 

Ideal for generating low noise negative rails

 

Product ID Output Current (mA) Input Max Voltage (V) Input Min Voltage (V) Dropout Voltage (V) Output Voltage (V) On/Off Pin Package
1000 -26   1 -5, -5.2, -12 — TO220, TO263
1000 -26   1 ADJ, -2 to
-25V		 Y TO220, TO263

 

WHAT'S NEW
LDO Parametric Tables
Featured LDO Solutions
  • 1.5A FlexCap LDO without Enable. Stable with ceramic, tantalum, or aluminum capacitors
  • Ultra Low Noise, 150mA Linear Regulator for RF/Analog Circuits Requires No Bypass Capacitor from the PowerWise® Family
  • Low Noise 150mA Voltage Regulator for RF/Analog Applications
  • Micropower, 150mA Low-Dropout CMOS Voltage Regulator
  • Micropower 200mA Low Dropout Voltage Regulator
  • 300mA Linear Voltage Regulator for Digital Applications from the PowerWise® Family
  • 350mA Dual Rail Linear Regulator from the PowerWise® Family
  • Dual Linear Regulator with 300mA and 150mA Outputs and Power-On-Reset

 



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