SLVS391C October   2001  – September 2015 TPS60500 , TPS60501 , TPS60502 , TPS60503

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  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. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Short-Circuit Current Limit and Thermal Protection
      2. 8.3.2 Enable
      3. 8.3.3 Power Good Detector
    4. 8.4 Device Functional Modes
      1. 8.4.1 Start-up Procedure
      2. 8.4.2 Conversion Modes
        1. 8.4.2.1 LDO Conversion Mode
        2. 8.4.2.2 2/3x Conversion Mode
        3. 8.4.2.3 0.5x Conversion Mode
        4. 8.4.2.4 1/3x Conversion Mode
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Typical Application Circuit for Fixed-Voltage and Adjustable-Voltage Versions
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Capacitor Selection
          2. 9.2.1.2.2 Resistor Combinations
        3. 9.2.1.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 DSP Supply With Sequencing
      2. 9.3.2 LC-Post Filter
      3. 9.3.3 Power Supply With Dynamic Voltage Scaling
      4. 9.3.4 Internet Audio Power Supply
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Related Links
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

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 TPS6050x devices are switched capacitor voltage converters providing fractional conversion to achieve high efficiency over a wide input and output voltage range. They support regulated output voltages of 3.3 V, 1.8 V and 1.5 V or adjustable output voltages from a 1.8-V to 6.5-V input voltage range.

9.2 Typical Applications

9.2.1 Typical Application Circuit for Fixed-Voltage and Adjustable-Voltage Versions

TPS60500 TPS60501 TPS60502 TPS60503 typapp2_1.png Figure 7. Typical Operating Circuit – TPS60500, Adjustable Output Voltage
TPS60500 TPS60501 TPS60502 TPS60503 typapp2_2.png Figure 8. Typical Operating Circuit – TPS60503, Maximum 150-mA Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typapp2_3.png Figure 9. Typical Operating Circuit – TPS60503, Maximum 250-mA Output Current

9.2.1.1 Design Requirements

The Detailed Design Procedure provides a component selection to operate the device within the recommended operating conditions

Figure 7, Figure 8 and Figure 9 show the typical operation circuits. The TPS60501 to TPS60503 devices use an internal resistor divider for sensing the output voltage. The FB pin must be connected externally with the output. For maximum output current and best performance, four ceramic capacitors are recommended. For lower currents or higher allowed output voltage ripple, other capacitors can also be used. TI recommends that the minimum value of the output capacitor be 4.7 µF. This value is necessary to maintain a stable operation of the system. Flying capacitors lower than 1 µF can be used, but this decreases the maximum output power. This means that the device works in linear mode with lower output currents. The device works in the linear mode for an output current of greater than 150 mA. With an output current greater than 150 mA, an output capacitor of ≥22 µF must be used. Figure 9 shows that two 10-µF capacitors can also be used in parallel.

9.2.1.2 Detailed Design Procedure

9.2.1.2.1 Capacitor Selection

Designed specifically for space-critical battery-powered applications, the complete converter requires only four external capacitors. The capacitor values are closely linked to the required output current, output noise, and ripple requirements. The input capacitor improves system efficiency by reducing the input impedance, and it also stabilizes the input current. The value of the output capacitor, CO, influences the stability of the voltage regulator. The minimum required capacitance for CO is 4.7 µF. Depending on the maximum allowed output ripple voltage and load current, larger values can be chosen. For an output current greater than 150 mA, a minimum output capacitor of 22 µF is required. Table 2 shows ceramic capacitor values recommended for low output voltage ripple.

Table 1. Recommended Capacitor Values

IOUT, MAX
[mA]
CIN
[µF]
C(xF)
[µF]
COUT
[µF]
50 2.2 0.22 4.7
150 4.7 1 10
250 4.7 1 22

Table 2. Recommended Capacitors

MANUFACTURER PART NUMBER SIZE CAPACITANCE TYPE
Taiyo Yuden LMK212BJ105KG
LMK212BJ225MG
EMK316BJ225KL
LMK316BJ475KL
JMK316BJ106KL
805
805
1206
1206
1206
1 µF
2.2 µF
2.2 µF
4.7 µF
10 µF
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
TDK C2012X5R1C105M
C2012X5R1A225M
C2012X5R0J106M
805
805
805
1 µF
2.2 µF
10 µF/6.3 V
Ceramic
Ceramic
Ceramic

Table 3 contains a list of manufacturers of ceramic capacitors. Ceramic capacitors provide the lowest output voltage ripple because they typically have the lowest ESR-rating.

Table 3. Recommended Capacitor Manufacturers

MANUFACTURER CAPACITOR TYPE INTERNET
Taiyo Yuden X7R/X5R ceramic www.t−yuden.com
TDK X7R/X5R ceramic www.component.tdk.com
Vishay X7R/X5R ceramic www.vishay.com
Kemet X7R/X5R ceramic www.kemet.com

9.2.1.2.2 Resistor Combinations

Table 4. Resistor Combinations

NOMINAL OUTPUT VOLTAGE EQUATION POSSIBLE E24 RESISTOR COMBINATIONS
1.2 V R1 = 0.5R2 R1 = 100 kΩ, R2 = 200 kΩ, (1.20 V)
1.5 V R1 = 0.875R2 R1 = 160 kΩ, R2 = 180 kΩ, (1.51 V)
1.6 V R1 = R2 any
1.8 V R1 = 1.25R2 R1 = 150 kΩ, R2 = 120 kΩ, (1.80 V)
2.5 V R1 = 2.125R2 R1 = 510 kΩ, R2 = 240 kΩ, (2.50 V)
R1 = 470 kΩ, R2 = 220 kΩ, (2.51 V)

Equations:

Equation 1. TPS60500 TPS60501 TPS60502 TPS60503 Eq04_RC1_slvs391.gif
Equation 2. TPS60500 TPS60501 TPS60502 TPS60503 Eq05_RC2_slvs391.gif

9.2.1.3 Application Curves

TPS60500 TPS60501 TPS60502 TPS60503 typchar2.gif
Figure 10. TPS60503
Minimum Input Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar4.gif
Figure 12. TPS60501
Minimum Input Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar6.gif
Figure 14. TPS60503
Efficiency vs Input Voltage
TPS60500 TPS60501 TPS60502 TPS60503 typchar8.gif
Figure 16. TPS60501
Efficiency vs Input Voltage
TPS60500 TPS60501 TPS60502 TPS60503 typchar10.gif
Figure 18. TPS60503
Output Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar12.gif
Figure 20. TPS60500
Output Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar15.gif
Figure 22. TPS60503
Efficiency vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar17.gif
Figure 24. TPS60501
Efficiency vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar19.gif
Figure 26. Output Voltage (Ripple) vs Time
TPS60500 TPS60501 TPS60502 TPS60503 typchar21.gif
Figure 28. Load Transient Response
TPS60500 TPS60501 TPS60502 TPS60503 typchar3.gif
Figure 11. TPS60502
Minimum Input Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar5.gif
Figure 13. TPS60500
Minimum Input Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar7.gif
Figure 15. TPS60502
Efficiency vs Input Voltage
TPS60500 TPS60501 TPS60502 TPS60503 typchar9.gif
Figure 17. TPS60500
Efficiency vs Input Voltage
TPS60500 TPS60501 TPS60502 TPS60503 typchar11.gif
Figure 19. TPS60502
Output Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar13.gif
Figure 21. TPS60501
Output Voltage vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar16.gif
Figure 23. TPS60502
Efficiency vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar18.gif
Figure 25. TPS60500
Efficiency vs Output Current
TPS60500 TPS60501 TPS60502 TPS60503 typchar20.gif
Figure 27. Line Transient Response

9.3 System Examples

9.3.1 DSP Supply With Sequencing

This application shows a power supply for a typical digital signal processor (DSP). DSPs usually have core voltages in the 1-V to 2.5-V range, whereas the voltage at the I/O-pins (I/O voltage) is typically 3.3 V to interface with external logic and converters. Therefore, a power supply with two output voltages is required. The application works with an input voltage in the range of 3.5 V to 6.5 V. The maximum output current is 150 mA on each output.

The supply is enabled by pulling the enable pin (EN of the TPS60503) to GND. The step-down charge pump starts and its power good (PG) output goes high. This enables the LDO which powers the I/O lines and generates a reset signal for the DSP. Figure 29 shows the timing diagram of the start-up or shutdown procedure.

TPS60500 TPS60501 TPS60502 TPS60503 typapp3.gif Figure 29. DSP Supply With Sequencing

9.3.2 LC-Post Filter

If the output voltage ripple of the step-down charge pump is to high, an LC post filter can be used.

TPS60500 TPS60501 TPS60502 TPS60503 typapp4.gif Figure 30. LC-Post Filter

Table 5. Measurement Results on Different C(fly), C(P), L(P) Combinations; BW = 500 MHz

VI
[V]
IO
[mA]
CI
[µF]
C(XF)
[µF]
CO
[µF]
L(P)
[µH]
C(P)
[µF]
VO
[V]
TYPICAL VP(Out) VPP[mV] TYPICAL VO(RMS) [mV]
CERAMIC CERAMIC CERAMIC CERAMIC
5 50 2.2 0.22 4.7 0.1 (X7R) 3.3 50 8
5 50 2.2 0.22 4.7 0.1 (X7R) 1.5 30 9
5 150 4.7 1 10 0.1 (X7R) 1.5 50 6
5 250 4.7 1 2 x 10 0.1 (X7R) 1.5 45 8
5 100 4.7 1 10 0.1 0.1 (X7R) 1.5 20 4

9.3.3 Power Supply With Dynamic Voltage Scaling

Dynamic voltage scaling of the core can be used to reduce power consumption of a digital signal processor (DSP). During the periods, in which the maximum DSP performance is not required, the core voltage can be reduced when the DSP operates at a lower clock-rate. This function is called runtime power control (RPC) and is supported by modern DSPs. RPC extends battery lifetime in handheld applications, like MP3 players and digital cameras.

The supply of DSPs is separated into I/O interface and core supply. Interface is mostly powered by a 3.3-V system supply, whereas core supply achieves voltages far below 1.5 V. The TPS60500 is powered by the 3.3-V system supply. The DSP itself selects the applied core voltage.

The core voltage is switched between 1.5 V and 1.1 V by changing the feedback resistor network. A MOSFET modifies the voltage divider at the feedback (FB) pin by switching a resistor. In this application, a general-purpose MOSFET BSS138 is used with a VGS(th) of 1.6 V. A DSP 3.3-V I/O port drives the gate. The feedback resistor network consists of R2, R3 and R4. C(ff) is the fast-forward capacitor for improved line regulation.

General requirements for the application:

  • Output voltage1 (DSP core): 1.5 V ±0.08 V
  • Output voltage 2 (DSP core): 1.1 V +0.1 V –0.05 V
  • Input voltage: 3 V to 3.3 V
  • Output current: 150 mA (10R load)
TPS60500 TPS60501 TPS60502 TPS60503 typapp5.gif Figure 31. Dynamic Voltage Scaling Application

To keep current through the adjustment resistor network as low as possible, the resistors are calculated to:

Equation 3. TPS60500 TPS60501 TPS60502 TPS60503 Eq01_Vout1_slvs391.gif
Equation 4. TPS60500 TPS60501 TPS60502 TPS60503 Eq02_vout2_slvs391.gif
Equation 5. TPS60500 TPS60501 TPS60502 TPS60503 Eq03_R4_slvs391.gif

9.3.4 Internet Audio Power Supply

The input voltage from a single or dual NiCd, NiMH or alkaline cell is boosted to 3.3 V. This voltage is used as system supply for the application and as an input voltage for the step-down charge pump which is used to provide the core voltage for a DSP.

TPS60500 TPS60501 TPS60502 TPS60503 typapp6.gif Figure 32. Internet Audio Power Supply