(ACTIVE) Fast-Transient Response, 3-A, Low-Dropout Voltage Regulators


The TPS757xx family of 3-A low dropout (LDO) regulators contains four fixed voltage option regulators with integrated power-good (PG) and an adjustable voltage option regulator. These devices are capable of supplying 3 A of output current with a dropout of 150 mV (TPS75733). Therefore, the device is capable of performing a 3.3-V to 2.5-V conversion. Quiescent current is 125 µA at full load and drops down to less than 1 µA when the device is disabled. The TPS757xx is designed to have fast transient response for large load current changes.

Because the PMOS device behaves as a low-value resistor, the dropout voltage is low (typically 150 mV at an output current of 3 A for the TPS75733) and is directly proportional to the output current. Additionally, since the PMOS pass element is a voltage-driven device, the quiescent current is low and independent of output loading (typically 125 &miccro;A over the full range of output current). These two key specifications yield a significant improvement in operating life for battery-powered systems.

The device is enabled when EN is connected to a low-level voltage. This LDO family also features a sleep mode; applying a TTL high signal to EN (enable) shuts down the regulator, reducing the quiescent current to less than 1 µA at TJ = 25°C. The power-good terminal (PG) is an active low, open drain output, which can be used to implement a power-on reset or a low-battery indicator.

The TPS757xx is offered in 1.5-V, 1.8-V, 2.5-V, and 3.3-V fixed-voltage versions and in an adjustable version (programmable over the range of 1.22 V to 5 V). Output voltage tolerance is specified as a maximum of 3% over line, load, and temperature ranges. The TPS757xx family is available in a 5-pin TO-220 (KC) and TO-263 (KTT) packages.


  • 3-A Low-Dropout Voltage Regulator
  • Available in 1.5-V, 1.8-V, 2.5-V, and 3.3-V Fixed-Output and Adjustable Versions
  • Open Drain Power-Good (PG) Status Output (Fixed Options Only)
  • Dropout Voltage Typically 150 mV at 3 A (TPS75733)
  • Low 125 µA Typical Quiescent Current
  • Fast Transient Response
  • 3% Tolerance Over Specified Conditions for Fixed-Output Versions
  • Available in 5-Pin TO-220 and TO-263 Surface-Mount Packages
  • Thermal Shutdown Protection


Output options Adjustable Output^Fixed Output    
Iout (Max) (A) 3    
Vin (Max) (V) 5.5    
Vin (Min) (V) 2.8    
Vout (Max) (V) 5    
Vout (Min) (V) 1.22    
Fixed output options (V) 1.5^1.8^2.5^3.3    
Package Group DDPAK/TO-263|5^TO-220|5    
Features Enable^Power Good    
Regulated outputs (#) 1    
Operating temperature range (C) -40 to 125    
Thermal Resistance θJA (°C/W) 39    
Noise (uVrms) 35    
Approx. price (US$) 3.31 | 1ku    
Rating Catalog    
Output capacitor type Non-Ceramic    
PSRR @ 100 KHz (dB) 12    
Accuracy (%) 3    
Vdo (Typ) (mV) 150    
Iq (Typ) (mA) 0.12    
Package size: mm2:W x L (PKG) 5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263|5)^See datasheet (TO-220)    

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