SGLS247B September   2011  – March 2016 TPS763-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Voltage Options
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Regulator Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Normal Operation
      2. 8.4.2 Dropout Operation
      3. 8.4.3 Disabled
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 External Capacitor Requirements
        2. 9.2.2.2 Output Voltage Programming
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Power Dissipation and Junction Temperature
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Community Resource
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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9 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.

9.1 Application Information

The TPS763xx-Q1 low-dropout (LDO) regulators are new families of regulators which have been optimized for use in battery-operated equipment and feature low dropout voltages, low quiescent current (140 μA), and an enable input to reduce supply currents to less than 2 μA when the regulator is turned off.

The TPS763xx-Q1 uses a PMOS pass element to dramatically reduce both dropout voltage and supply current over more conventional PNP pass element LDO designs. The PMOS pass element is a voltage-controlled device that, unlike a PNP transistor, does not require increased drive current as output current increases. Supply current in the TPS763xx-Q1 is essentially constant from no-load to maximum load.

Current limiting and thermal protection prevent damage by excessive output current and/or power dissipation. The device switches into a constant-current mode at approximately 1 A; further load reduces the output voltage instead of increasing the output current. The thermal protection shuts the regulator off if the junction temperature rises above 165°C. Recovery is automatic when the junction temperature drops approximately 25°C below the high temperature trip point. The PMOS pass element includes a back diode that safely conducts reverse current when the input voltage level drops below the output voltage level.

A logic low on the enable input, EN shuts off the output and reduces the supply current to less than 2 μA. EN should be tied high in applications where the shutdown feature is not used.

9.2 Typical Application

A typical application circuit is shown in Figure 20.

TPS763-Q1 TPS76301-Q1 TPS76316-Q1 TPS76318-Q1 TPS76325-Q1 TPS76330-Q1 TPS76333-Q1 TPS76350-Q1 typ_app_circuit_slgs247.gif

NOTE:

TPS76316-Q1, TPS76318-Q1, TPS76325-Q1, TPS76301-Q1 TPS76333-Q1, TPS76350-Q1 (fixed-voltage options)
Figure 20. Typical Application Circuit

9.2.1 Design Requirements

Table 2 lists the design requirements.

Table 2. Design Parameters

PARAMETER DESIGN REQUIREMENTS
Input voltage 2.7 to 10 V
Output voltage 2.5 to 6.45 V
Output current 0 to 150 mA

9.2.2 Detailed Design Procedure

9.2.2.1 External Capacitor Requirements

Although not required, a 0.047 μF or larger ceramic bypass input capacitor, connected between IN and GND and located close to the TPS763xx-Q1, is recommended to improve transient response and noise rejection. A higher-value electrolytic input capacitor may be necessary if large, fast-rise-time load transients are anticipated and the device is located several inches from the power source.

Like all low dropout regulators, the TPS763xx-Q1 requires an output capacitor connected between OUT and GND to stabilize the internal loop control. The minimum recommended capacitance value is 4.7 μF and the ESR (equivalent series resistance) must be between 0.3 Ω and 10 Ω. Capacitor values of 4.7 μF or larger are acceptable, provided the ESR is less than 10 Ω. Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements described above. Most of the commercially available 4.7-μF surface-mount solid tantalum capacitors, including devices from Sprague, Kemet, and Nichico, meet the ESR requirements stated above.

Table 3. Capacitor Selection

PART NO. MFR. VALUE MAX ESR SIZE (H × L × W)
T494B475K016AS KEMET 4.7 μF 1.5 Ω 1.9 × 3.5 × 2.8
195D106x0016x2T SPRAGUE 10 μF 1.5 Ω 1.3 × 7.0 × 2.7
695D106x003562T SPRAGUE 10 μF 1.3 Ω 2.5 × 7.6 × 2.5
TPSC475K035R0600 AVX 4.7 μF 0.6 Ω 2.6 × 6.0 × 3.2

9.2.2.2 Output Voltage Programming

The output voltage of the TPS76301-Q1 adjustable regulator is programmed using an external resistor divided as shown in figure 21. The output voltage is calculated using Equation 1.

Equation 1. VO = 0.995 × VREF × (1 + R1/R2)

where

  • VREF = 1.192 V typical (the internal reference voltage)
  • 0.995 is a constant used to center the load regulator (1%)

Resistors R1 and R2 should be chosen for approximately 7-μA divider current. Lower value resistors can be used, but offer no inherent advantage and waste more power. Higher values should be avoided as leakage currents at FB increase the output voltage error. The recommended design procedure is to choose R2 = 169 kΩ to set the divider current at 7 μA and then calculate R1 using Equation 2.

Equation 2. TPS763-Q1 TPS76301-Q1 TPS76316-Q1 TPS76318-Q1 TPS76325-Q1 TPS76330-Q1 TPS76333-Q1 TPS76350-Q1 equation_02_slgs247.gif
TPS763-Q1 TPS76301-Q1 TPS76316-Q1 TPS76318-Q1 TPS76325-Q1 TPS76330-Q1 TPS76333-Q1 TPS76350-Q1 TPS76301_adjustable_LDO_regulator_programming_slgs247.gif Figure 21. TPS76301-Q1 Adjustable LDO Regulator Programming

Table 4. Output Voltage Programming Guide

OUTPUT VOLTAGE (V) DIVIDER RESISTANCE (kΩ)(1)
R1 R2
2.5 187 169
3.3 301 169
3.6 348 169
4 402 169
5 549 169
6.45 750 169
(1) 1% values shown.

9.2.3 Application Curves

TPS763-Q1 TPS76301-Q1 TPS76316-Q1 TPS76318-Q1 TPS76325-Q1 TPS76330-Q1 TPS76333-Q1 TPS76350-Q1 graph_14_slgs247.gif
Figure 22. TPS76350-Q1 Line Transient Response
TPS763-Q1 TPS76301-Q1 TPS76316-Q1 TPS76318-Q1 TPS76325-Q1 TPS76330-Q1 TPS76333-Q1 TPS76350-Q1 graph_15_slgs247.gif
Figure 23. TPS76350-Q1 Load Transient Response