SLVS010V January   1976  – November 2016

PRODUCTION DATA.  

  1. Features
  2. Description
  3. Revision History
  4. Pin Configuration and Functions
  5. Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics: UA78L02
    6. 5.6  Electrical Characteristics: UA78L05
    7. 5.7  Electrical Characteristics: UA78L06
    8. 5.8  Electrical Characteristics: UA78L08
    9. 5.9  Electrical Characteristics: UA78L09
    10. 5.10 Electrical Characteristics: UA78L10
    11. 5.11 Electrical Characteristics: UA78L12
    12. 5.12 Electrical Characteristics: UA78L15
    13. 5.13 Typical Characteristics
  6. Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
    4. 6.4 Device Functional Modes
      1. 6.4.1 Fixed-Output Mode
  7. Applications and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curves
    3. 7.3 System Examples
      1. 7.3.1 Positive Regulator in Negative Configuration
      2. 7.3.2 Current Limiter Circuit
  8. Power Supply Recommendations
  9. Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Related Links
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Community Resource
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
  • PK|3
  • LP|3
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Applications and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

Application Information

The UA78L00 devices are ideal for use as linear regulators with only a few external components needed. The UA78L00 devices can also be used to clean power supply noise by attenuating ripple on the input signal.

Typical Application

The UA78L00 devices are typically used as fixed-output linear regulators, sourcing current up to 100 mA into a load.

UA78L02A UA78L05 UA78L05A UA78L06A UA78L08A UA78L09A UA78L10A UA78L12A UA78L15A FixedOutputRegulator.gif Figure 5. Fixed Output Regulator

Design Requirements

The COMMON pin must be tied to ground to set the OUTPUT pin to the desired fixed output voltage.

Although not required, a 0.33-µF bypass capacitor is recommended on the input, and a 0.1-µF bypass capacitor is recommend on the output.

Detailed Design Procedure

Occasionally, the input voltage to the regulator can collapse faster than the output voltage. For example, this can occur when the input supply is crowbarred during an output overvoltage condition. If the output voltage is greater than approximately 7 V, the emitter-base junction of the series-pass element (internal or external) could break down and be damaged. To prevent this, a diode shunt can be employed as shown in Figure 6.

UA78L02A UA78L05 UA78L05A UA78L06A UA78L08A UA78L09A UA78L10A UA78L12A UA78L15A ReverseBiasProtection.gif Figure 6. Reverse-Bias-Protection Circuit

In many cases, a regulator powers a load that is not connected to ground, but instead, is connected to a voltage source of opposite polarity (for example, operational amplifiers, level-shifting circuits, and so on). In these cases, a clamp diode should be connected to the regulator output as shown in Figure 7. This protects the regulator from output polarity reversals during startup and short-circuit operation.

UA78L02A UA78L05 UA78L05A UA78L06A UA78L08A UA78L09A UA78L10A UA78L12A UA78L15A OppositePolarityProtection.gif Figure 7. Output Polarity-Reversal-Protection Circuit

Application Curves

UA78L02A UA78L05 UA78L05A UA78L06A UA78L08A UA78L09A UA78L10A UA78L12A UA78L15A D005_VoutVsVin.gif Figure 8. Output Voltage vs Input Voltage

System Examples

Positive Regulator in Negative Configuration

UA78L02A UA78L05 UA78L05A UA78L06A UA78L08A UA78L09A UA78L10A UA78L12A UA78L15A NegativeConfiguration.gif Figure 9. Positive Regulator in Negative Configuration (VI Must Float)

Current Limiter Circuit

Figure 10 shows an example of using the UA78L00 as a current limiter. The output current limit is set by Equation 1.

Equation 1. UA78L02A UA78L05 UA78L05A UA78L06A UA78L08A UA78L09A UA78L10A UA78L12A UA78L15A eq_lvs010.gif
UA78L02A UA78L05 UA78L05A UA78L06A UA78L08A UA78L09A UA78L10A UA78L12A UA78L15A CurrentLimiter.gif Figure 10. Current Limiter Example