SLVS029H January   1984  – November  2015 TL499A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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発注情報

8 Application 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.

8.1 Application Information

One or two power sources will be regulated to an output voltage set by two feedback resistors.

8.2 Typical Application

Figure 3 shows the basic configuration of the two power source voltage regulator

TL499A TL499A_basic_configuration_slvs029.gif Figure 3. TL499A Basic Configuration

8.2.1 Design Requirements

Provide one or more of the following power sources:

  • SERIES IN1 voltage greater than OUTPUT voltage by more than dropout voltage
  • SW REG IN2 voltage less than OUTPUT voltage

Select RCL value based on Table 1 through Table 5.

Table 1. Maximum Output Current vs Input and Output Voltages for Step-Up Switching Regulator With RCL = 150 Ω

OUTPUT VOLTAGE (V) SWITCHING REGULATOR INPUT VOLTAGE (SW REG IN2) (V)
1.1 1.2 1.3 1.5 1.7 2 2.5 3 5 6 9
OUTPUT CURRENT (mA)
30 65 90
25 50 80 100
20 20 25 30 85 100 100
15 15 20 30 45 55 100 100 100
12 10 15 20 25 30 40 55 70 100 100 100
10 15 20 25 30 35 45 65 80 100 100
9 20 25 25 35 40 50 70 90 100 100
6 30 35 40 45 55 75 95 100
5 35 40 45 55 70 85 100 100 Circuit of Figure 1, except:
RCL = 150 Ω
CF = 330 μF
CP = 0.1 μF
4.5 35 45 50 60 75 95 100 100(1)
3 55 65(1) 75(1) 95(1) 100(1)
2.9 60(1) 70(1) 75(1) 100(1) 100(1)
(1) The difference between the output and input voltage for these combinations is greater than the minimum output-to-input differential-voltage specification at 70°C (1.2 V), but less than the minimum at 85°C (1.9 V).

Table 2. Maximum Output Current vs Input and Output Voltages for Step-Up Switching Regulator With RCL = 200 Ω

OUTPUT VOLTAGE (V) SWITCHING REGULATOR INPUT VOLTAGE (SW REG IN2) (V)
1.1 1.2 1.3 1.5 1.7 2 2.5 3 5 6 9
OUTPUT CURRENT (mA)
30 50 100
25 50 70 100
20 15 25 30 70 90 100
15 10 15 25 35 45 90 100 100
12 10 10 15 20 25 35 45 60 100 100 100
10 15 20 20 25 30 40 55 70 100 100
9 20 20 25 30 35 45 60 80 100
6 25 30 35 45 50 65 90 100
5 30 35 40 55 60 75 100 100 Circuit of Figure 1, except:
RCL = 200 Ω
CF = 330 μF
CP = 0.1 μF
4.5 35 40 45 55 65 85 100 100(1)
3 50 55(1) 65(1) 80(1) 90(1)
2.9 50(1) 60(1) 65(1) 85(1) 100(1)
(1) The difference between the output and input voltage for these combinations is greater than the minimum output-to-input differential-voltage specification at 70°C (1.2 V), but less than the minimum at 85°C (1.9 V).

Table 3. Maximum Output Current vs Input and Output Voltages for Step-Up Switching Regulator With RCL = 300 Ω

OUTPUT VOLTAGE (V) SWITCHING REGULATOR INPUT VOLTAGE (SW REG IN2) (V)
1.1 1.2 1.3 1.5 1.7 2 2.5 3 5 6 9
OUTPUT CURRENT (mA)
30 40 70
25 40 55 100
20 10 15 20 55 70 100
15 10 10 20 30 35 75 95 100
12 10 10 10 15 20 25 35 45 95 100 100
10 15 15 15 20 25 30 45 55 100 100
9 15 15 20 25 30 35 50 60 100 100
6 25 25 30 35 45 55 70 90
5 30 30 35 45 50 65 85 100 Circuit of Figure 1, except:
RCL = 300 Ω
CF = 330 μF
CP = 0.1 μF
4.5 30 35 40 45 55 70 95 100(1)
3 45 50(1) 55(1) 70(1) 90(1)
2.9 45(1) 50(1) 60(1) 75(1) 95(1)
(1) The difference between the output and input voltage for these combinations is greater than the minimum output-to-input differential-voltage specification at 70°C (1.2 V), but less than the minimum at 85°C (1.9 V).

Table 4. Maximum Output Current vs Input and Output Voltages for Step-Up Switching Regulator With RCL = 510 Ω

OUTPUT VOLTAGE (V) SWITCHING REGULATOR INPUT VOLTAGE (SW REG IN2) (V)
1.1 1.2 1.3 1.5 1.7 2 2.5 3 5 6 9
OUTPUT CURRENT (mA)
30 30 50
25 25 40 75
20 40 55 90
15 15 20 55 70 100
12 10 15 25 35 65 80 100
10 10 20 25 30 40 70 85
9 10 10 10 15 20 25 35 45 75 100
6 15 20 20 25 30 35 50 60
5 20 20 35 30 35 45 55 70 Circuit of Figure 1, except:
RCL = 510 Ω
CF = 330 μF
CP = 0.1 μF
4.5 25 25 30 35 40 50 65 90(1)
3 35 35(1) 40(1) 50(1) 75(1)
2.9 35(1) 35(1) 40(1) 55(1) 80(1)
(1) The difference between the output and input voltage for these combinations is greater than the minimum output-to-input differential-voltage specification at 70°C (1.2 V), but less than the minimum at 85°C (1.9 V).

Table 5. Maximum Output Current vs Input and Output Voltages for Step-Up Switching Regulator With RCL = 1 kΩ

OUTPUT VOLTAGE (V) SWITCHING REGULATOR INPUT VOLTAGE (SW REG IN2) (V)
1.1 1.2 1.3 1.5 1.7 2 2.5 3 5 6 9
OUTPUT CURRENT (mA)
30 35
25 35 50
20 35 60
15 10 30 45 65
12 20 40 45 85
10 15 25 40 55
9 10 10 15 25 30 45 60
6 10 10 10 15 20 20 30 35
5 10 10 15 20 20 25 35 40 Circuit of Figure 1, except:
RCL = 1 kΩ
CF = 330 μF
CP = 0.1 μF
4.5 15 15 15 20 25 30 40 45(1)
3 20 25(1) 25(1) 30(1) 35(1)
2.9 20(1) 25(1) 25(1) 30(1) 45(1)
(1) The difference between the output and input voltage for these combinations is greater than the minimum output-to-input differential-voltage specification at 70°C (1.2 V), but less than the minimum at 85°C (1.9 V).

8.2.2 Detailed Design Procedure

Select the values for RE1and RE2 using Equation 1:

Equation 1. VOUT = REF × ( 1 + RE1/ RE2)

8.2.3 Application Curve

TL499A APPVDO.png
IOUT = 50 mA
Figure 4. Dropout Voltage vs Temperature