SPX29302T5-L/TR

Manufacturer EXAR CORPORATION
Manufacturer part number SPX29302T5-L/TR
Part Number SPX29302T5-LTR
Input Voltage 20V
Storage Temperature -65 ~ 150°C
Lead Temperature 260°C
Input Voltage Range 16V
Junction Temperature Range -40 ~ 125°C

3A Low Dropout Voltage Regulator

Other Package Parts

  • SPX29300T-L-1-8
  • SPX29300T-L-1-8/TR
  • SPX29300T-L-2-5
  • SPX29300T-L-2-5/TR
  • SPX29300T-L-3-3
  • SPX29300T-L-3-3/TR
  • SPX29300T-L-5-0
  • SPX29300T-L-5-0/TR
  • SPX29301T5-L-3-3
  • SPX29301T5-L-3-3/TR
  • SPX29301T5-L-5-0
  • SPX29301T5-L-5-0/TR
  • SPX29302T5-L
  • SPX29302T5-L/TR
  • SPX29302U5-L

GENERAL DESCRIPTION

The SPX29300/01/02 are 3A, highly accurate voltage regulators with a low dropout voltage of 600mV (typical) at 3A.

These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against overcurrent, reverse battery, and positive and negative voltage transients. On-Chip trimming adjusts the reference voltage to 1% initial accuracy.

The SPX29300 is offered in a 3-pin TO-263 package, the SPX29301 is offered in a 5-pin TO-263 while SPX29302 is offered in a 5-pin TO-263 and 5-pin TO-220 packages.

APPLICATIONS

  • Adjustable Power Supplies
  • Constant Current Regulators
  • Audio and Video/Graphic Cards
  • Battery Chargers

FEATURES

  • 3A Guaranteed Output Current
  • Low Dropout Voltage of 600mV @ 3A
  • Adjustable Output down to 1.25V
  • 1% Output Accuracy
  • Tight Load and Line Regulation
  • Fast Transient Response
  • Reverse Battery Protection
  • Zero Current Shutdown (SPX29301/02)
  • Power Good Flag (SPX29301)
  • Lead Free 3-Pin TO-263, 5-pin TO-220 and TO-263 Packages

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

ELECTRICAL SPECIFICATIONS

Specifications with standard type are for an Operating Junction Temperature of TJ = TA = 25°C only; limits applying over the full Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise indicated, VIN = VOUT + 1V and IOUT=10mA, CIN = 6.8µF, COUT = 10µF, TA= 25°C.

THEORY OF OPERATION

The SPX29300/01/02 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage.

THERMAL CONSIDERATIONS

Although the SPX29300/01/02 offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction temperature is not exceeded in the application. Heat will flow through the lowest resistance path, the junction-to-case path. In order to insure the best thermal flow of the component, proper mounting is required.

CAPACITOR REQUIREMENTS

The output capacitor is needed to insure stability and minimize the output noise. The value of the capacitor varies with the load. However, a minimum value of 10μF aluminum capacitor will guarantee stability over all load conditions.

A tantalum capacitor is recommended if a faster load transient response is needed. If the power source has high AC impedance, a 0.1μF ceramic capacitor between input & ground is recommended.

MINIMUM LOAD CURRENT

To ensure a proper behavior of the regulator under light load, a minimum load of 5mA for SPX29300/01/02 is required.

ADJUSTABLE REGULATOR DESIGN

The SPX29300/01/02 is an adjustable regulator that can be programmed to any value between 1.25V and 16V using 2 external resistors, R1 and R2. The relationship between the resistors and the output voltage is:

ERROR FLAG

The SPX29301 features an error flag that indicates either an over current or under current voltage condition. The flag output goes low, sinking 10mA when either conditions occurs.

ENABLE INPUT

The SPX29301/02 has an Enable function that switches the regulator on and off. Their thresholds are TTL compatible. When the regulator is active, approximately 20µA flows through the Enable pin.

TYPICAL APPLICATION CIRCUITS

Figure 1 represents the typical implementation for an adjustable output regulator. The values of R1 and R2 set the output voltage value as follows:

A minimum value of 10kohms is recommended for R2 with a range between 10kΩ and 47kΩ.

Other Parts