SLVSAK9H October   2011  – January 2017 TLV62080 , TLV62084 , TLV62084A

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5  Device Comparison Table
  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. 8.3.1 100% Duty-Cycle Low-Dropout Operation
      2. 8.3.2 Enabling and Disabling the Device
      3. 8.3.3 Output Discharge
      4. 8.3.4 Soft Start
      5. 8.3.5 Power Good
      6. 8.3.6 Undervoltage Lockout
      7. 8.3.7 Thermal Shutdown
      8. 8.3.8 Inductor Current-Limit
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power Save Mode
  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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Output Filter Design
        3. 9.2.2.3 Inductor Selection
        4. 9.2.2.4 Capacitor Selection
        5. 9.2.2.5 Setting the Output Voltage
      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 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
        1. 12.1.2.1 Custom Design With WEBENCH® Tools
    2. 12.2 Documentation Support
    3. 12.3 Related Links
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Receiving Notification of Documentation Updates
    7. 12.7 Community Resources
    8. 12.8 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 devices are designed to operate from an input voltage supply range between 2.5 V (2.7 V for the TLV62084x devices) and 6 V with a maximum output current of 2 A (1.2 A for the TLV62080 device). The TLV6208x devices operate in PWM mode for medium to heavy load conditions and in power save mode at light load currents.

In PWM mode the TLV6208x converters operate with the nominal switching frequency of 2 MHz which provides a controlled frequency variation over the input voltage range. As the load current decreases, the converter enters power save mode, reducing the switching frequency and minimizing the IC quiescent current to achieve high efficiency over the entire load current range.

The WEBENCH software uses an iterative design procedure and accesses a comprehensive database of components when generating a design. See the Documentation Support section for additional documentation.

9.2 Typical Application

TLV62080 TLV62084 TLV62084A SLVSAK9_typapp.gif Figure 9. Typical Application Schematic

9.2.1 Design Requirements

Use the following typical application design procedure to select external components values for the TLV62084 device.

Table 4. Design Parameters

DESIGN PARAMETERS EXAMPLE VALUES
Input Voltage Range 2.8 V to 4.2 V
Output Voltage 1.2 V
Transient Response ±5% VOUT
Input Voltage Ripple 400 mV
Output Voltage Ripple 30 mV
Output Current Rating 2 A
Operating frequency 2 MHz

9.2.2 Detailed Design Procedure

9.2.2.1 Custom Design With WEBENCH® Tools

Click here to create a custom design using the TLV62080 device with the WEBENCH® Power Designer.

  1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.
  2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.
  3. Compare the generated design with other possible solutions from Texas Instruments.

The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time pricing and component availability.

In most cases, these actions are available:

  • Run electrical simulations to see important waveforms and circuit performance
  • Run thermal simulations to understand board thermal performance
  • Export customized schematic and layout into popular CAD formats
  • Print PDF reports for the design, and share the design with colleagues

Get more information about WEBENCH tools at www.ti.com/WEBENCH.

Table 5. List of Components

REFERENCE DESCRIPTION MANUFACTURER(1)
C1 10 μF, Ceramic Capacitor, 6.3 V, X5R, size 0603 Std
C2 22 μF, Ceramic Capacitor, 6.3 V, X5R, size 0805, GRM21BR60J226ME39L Murata
C3 47 μF, Tantalum Capacitor, 8 V, 35 mΩ, size 3528, T520B476M008ATE035 Kemet
L1 1 μH, Power Inductor, 2.2 A, size 3 mm × 3 mm × 1.2 mm, XFL3012-102MEB Coilcraft
R1 65.3 kΩ, Chip Resistor, 1/16 W, 1%, size 0603 Std
R2 39.2 kΩ, Chip Resistor, 1/16 W, 1%, size 0603 Std
R3 178 kΩ, Chip Resistor, 1/16 W, 1%, size 0603 Std

9.2.2.2 Output Filter Design

The inductor and the output capacitor together provide a low pass frequency filter. To simplify this process Table 6 outlines possible inductor and capacitor value combinations for the most application.

Table 6. Matrix of Output Capacitor and Inductor Combinations

L [µH](3) COUT [µF](3)
10 22 47 100 150
0.47
1 + +(1)(2) + +
2.2 + + + +
4.7
(1) Plus signs (+) indicates recommended filter combinations.
(2) Filter combination in typical application.
(3) Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by +20% and –50%. Inductor tolerance and current de-rating is anticipated. The effective inductance can vary by +20% and –30%.

9.2.2.3 Inductor Selection

The main parameter for the inductor selection is the inductor value and then the saturation current of the inductor. To calculate the maximum inductor current under static load conditions, Equation 2 is given.

Equation 2. TLV62080 TLV62084 TLV62084A Eq_IL_peak_PWM_lvsae8.gif

where

  • IOUT,MAX = Maximum output current
  • ΔIL = Inductor current ripple
  • fSW = Switching frequency
  • L = Inductor value

space

TI recommends choosing the saturation current for the inductor 20% to approximately 30% higher than the IL,MAX, out of Equation 2. A higher inductor value is also useful to lower ripple current, but increases the transient response time as well. The following inductors are recommended to be used in designs (see Table 7).

Table 7. List of Recommended Inductors

INDUCTANCE
[µH]		 CURRENT RATING
[mA]		 DIMENSIONS
L x W x H [mm3]		 DC RESISTANCE
[mΩ typ]		 TYPE MANUFACTURER(2)
1 2500 3 × 3 × 1.2 35 XFL3012-102ME Coilcraft
1 1650(1) 3 × 3 × 1.2 40 LQH3NPN1R0NJ0 Murata
2.2 2500 4 × 3.7 × 1.65 49 LQH44PN2R2MP0 Murata
2.2 1600(1) 3 × 3 × 1.2 81 XFL3012-222ME Coilcraft
(1) Recommended for TLV62080 only due to limited current rating

9.2.2.4 Capacitor Selection

The input capacitor is the low impedance energy source for the converter which helps to provide stable operation. A low ESR multilayer ceramic capacitor is recommended for best filtering and must be placed between VIN and GND as close as possible to those terminals. For most applications 10 μF is sufficient though a larger value reduces input current ripple.

The architecture of the TLV6208x device allows use of tiny ceramic-type output capacitors with low equivalent-series resistance (ESR). These capacitors provide low output voltage ripple and are recommended. To keep the resistance up to high frequencies and to get narrow capacitance variation with temperature, TI recommends use of the X7R or X5R dielectric. The TLV62080 and TLV62084x devices are designed to operate with an output capacitance of 10 to 100 µF and beyond, as listed in Table 6. Load transient testing and measuring the bode plot are good ways to verify stability with larger capacitor values.

Table 8. List of Recommended Capacitors

CAPACITANCE
[µF]		 TYPE DIMENSIONS
L x W x H [mm3]		 MANUFACTURER(1)
10 GRM188R60J106M 0603: 1.6 × 0.8 × 0.8 Murata
22 GRM188R60G226M 0603: 1.6 × 0.8 × 0.8 Murata
22 GRM21BR60J226M 0805: 2 × 1.2 × 1.25 Murata

9.2.2.5 Setting the Output Voltage

By selecting R1 and R2, the output voltage is programmed to the desired value. Use Equation 3 to calculate R1 and R2.

TLV62080 TLV62084 TLV62084A SLVSAK9_simplified_62084.gif Figure 10. Typical Application Circuit

space

Equation 3. TLV62080 TLV62084 TLV62084A EQ1_VS_lvsae8.gif

For best accuracy, R2 must be kept smaller than 40 kΩ to ensure that the current flowing through R2 is at least 100-times larger than IFB. Changing the sum towards a lower value increases the robustness against noise injection. Changing the sum towards higher values reduces the current consumption.

9.2.3 Application Curves

TLV62080 TLV62084 TLV62084A G14_TPS62080.gif
VIN = 3.3 V VOUT = 1.2 V ILOAD = 500 mA
Figure 11. Typical Application (PWM Mode)
TLV62080 TLV62084 TLV62084A G17_TPS62080.gif
L = 1 µH COUT = 22 µF VIN = 3.3 V
VOUT = 1.2 V ILOAD = 50 mA to 1 A
Figure 13. Load Transient
TLV62080 TLV62084 TLV62084A G15_TPS62080.gif
VIN = 3.3 V VOUT = 1.2 V ILOAD = 10 mA
Figure 12. Typical Application (PFM Mode)
TLV62080 TLV62084 TLV62084A SLVSAK9_ltran084.gif
L = 1 µH COUT = 22 µF VIN = 3.3 V
VOUT = 1.2 V ILOAD = 200 mA to 1.8 A
Figure 14. Load Transient
TLV62080 TLV62084 TLV62084A G18_TPS62080.gif
VIN = 3.3 to 4.2 V VOUT = 1.2 V ILOAD = 2.2 Ω
Figure 15. Line Transient
TLV62080 TLV62084 TLV62084A G20_TPS62080.gif
VIN = 3.3 V VOUT = 1.2 V
Figure 17. Startup (No Load)
TLV62080 TLV62084 TLV62084A G19_TPS62080.gif
VIN = 3.3 V VOUT = 1.2 V ILOAD = 2.2 Ω
Figure 16. Startup