SBVS291C April   2017  – December 2020 TPS7A84A

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: General
    6. 6.6 Electrical Characteristics: TPS7A8400A
    7. 6.7 Electrical Characteristics: TPS7A8401A
    8. 6.8 Typical Characteristics: TPS7A8400A
    9. 6.9 Typical Characteristics: TPS7A8401A
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Voltage Regulation Features
        1. 7.3.1.1 DC Regulation
        2. 7.3.1.2 AC and Transient Response
      2. 7.3.2 System Start-Up Features
        1. 7.3.2.1 Programmable Soft Start (NR/SS)
        2. 7.3.2.2 Internal Sequencing
          1. 7.3.2.2.1 Enable (EN)
          2. 7.3.2.2.2 Undervoltage Lockout (UVLO) Control
          3. 7.3.2.2.3 Active Discharge
        3. 7.3.2.3 Power-Good Output (PG)
      3. 7.3.3 Internal Protection Features
        1. 7.3.3.1 Foldback Current Limit (ICL)
        2. 7.3.3.2 Thermal Protection (Tsd)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Regulation
      2. 7.4.2 Disabled
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 External Component Selection
        1. 8.1.1.1 Adjustable Operation
        2. 8.1.1.2 ANY-OUT Programmable Output Voltage
        3. 8.1.1.3 ANY-OUT Operation
        4. 8.1.1.4 Increasing ANY-OUT Resolution for LILO Conditions
        5. 8.1.1.5 Current Sharing
        6. 8.1.1.6 Recommended Capacitor Types
        7. 8.1.1.7 Input and Output Capacitor Requirements (CIN and COUT)
        8. 8.1.1.8 Feed-Forward Capacitor (CFF)
        9. 8.1.1.9 Noise-Reduction and Soft-Start Capacitor (CNR/SS)
      2. 8.1.2 Start-Up
        1. 8.1.2.1 Circuit Soft-Start Control (NR/SS)
          1. 8.1.2.1.1 Inrush Current
        2. 8.1.2.2 Undervoltage Lockout (UVLO)
        3. 8.1.2.3 Power-Good (PG) Function
      3. 8.1.3 AC and Transient Performance
        1. 8.1.3.1 Power-Supply Rejection Ratio (PSRR)
        2. 8.1.3.2 Output Voltage Noise
        3. 8.1.3.3 Optimizing Noise and PSRR
          1. 8.1.3.3.1 Charge Pump Noise
        4. 8.1.3.4 Load Transient Response
      4. 8.1.4 DC Performance
        1. 8.1.4.1 Output Voltage Accuracy (VOUT)
        2. 8.1.4.2 Dropout Voltage (VDO)
          1. 8.1.4.2.1 Behavior When Transitioning From Dropout Into Regulation
      5. 8.1.5 Sequencing Requirements
      6. 8.1.6 Negatively Biased Output
      7. 8.1.7 Reverse Current Protection
      8. 8.1.8 Power Dissipation (PD)
        1. 8.1.8.1 Estimating Junction Temperature
        2. 8.1.8.2 Recommended Area for Continuous Operation (RACO)
    2. 8.2 Typical Applications
      1. 8.2.1 Low-Input, Low-Output (LILO) Voltage Conditions
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
  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 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Evaluation Models
        2. 11.1.1.2 Spice Models
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary

8.1.1.2 ANY-OUT Programmable Output Voltage

The TPS7A84A can use either external resistors or the internally-matched ANY-OUT feedback resistor network to set output voltage. The ANY-OUT resistors are accessible via pin 2 and pins 5 to 11 and are used to program the regulated output voltage. Each pin is can be connected to ground (active) or left open (floating), or connected to SNS. ANY-OUT programming is set by Equation 2 as the sum of the internal reference voltage (VNR/SS = 0.8 V) plus the accumulated sum of the respective voltages assigned to each active pin; that is, for the TPS7A8400A, 50mV (pin 5), 100mV (pin 6), 200mV (pin 7), 400mV (pin 9), 800mV (pin 10), or 1.6V (pin 11), and for the TPS7A8401A, 25mV (pin 5), 50mV (pin 6), 100mV (pin 7), 200mV (pin 9), 400mV (pin 10), or 800mV (pin 11). Table 8-3 summarizes these voltage values associated with each active pin setting for reference. By leaving all program pins open or floating, the output is thereby programmed to the minimum possible output voltage equal to VFB.

Equation 2. VOUT = VNR/SS + (Σ ANY-OUT Pins to Ground)
Table 8-3 ANY-OUT Programmable Output Voltage (RGR Package)
ANY-OUT PROGRAM PINS (Active Low)ADDITIVE OUTPUT VOLTAGE LEVEL (TPS7A8400A)ADDITIVE OUTPUT VOLTAGE LEVEL (TPS7A8401A)
Pin 550 mV25 mV
Pin 6100 mV50 mV
Pin 7200 mV100 mV
Pin 9400 mV200 mV
Pin 10800 mV400 mV
Pin 111.6 V800 mV

Table 8-4 and Table 8-5 provide a full list of target output voltages and corresponding pin settings when the ANY-OUT pins are only tied to ground or left floating. The voltage setting pins have a binary weight; therefore, the output voltage can be programmed to any value from 0.8 V to 3.95 V in 50-mV steps for the TPS7A8400A and from 0.5 V to 2.075 V for the TPS7A8401A in 25-mV steps when tying these pins to ground. There are several alternative ways to set the output voltage. The program pins can be driven using external general-purpose input/output pins (GPIOs), manually connected using 0-Ω resistors (or left open), or hardwired by the given layout of the printed circuit board (PCB) to set the ANY-OUT voltage. As with the adjustable operation, the output voltage is set according to Equation 3 except that R1 and R2 are internally integrated and matched for higher accuracy. Tying any of the ANY-OUT pins to SNS can increase the resolution of the internal feedback network by lowering the value of R1. See the Section 8.1.1.4 section for additional information.

Equation 3. VOUT = VNR/SS × (1 + R1 / R2)
Note:

For output voltages greater than 3.95 V, use a traditional adjustable configuration (see the Section 8.1.1.1 section).

Table 8-4 TPS7A8400A User-Configurable Output Voltage Settings
VOUT(NOM)
(V)		 50mV 100mV 200mV 400mV 800mV 1.6V VOUT(NOM)
(V)		 50mV 100mV 200mV 400mV 800mV 1.6V
0.80 Open Open Open Open Open Open 2.40 Open Open Open Open Open GND
0.85 GND Open Open Open Open Open 2.45 GND Open Open Open Open GND
0.90 Open GND Open Open Open Open 2.50 Open GND Open Open Open GND
0.95 GND GND Open Open Open Open 2.55 GND GND Open Open Open GND
1.00 Open Open GND Open Open Open 2.60 Open Open GND Open Open GND
1.05 GND Open GND Open Open Open 2.65 GND Open GND Open Open GND
1.10 Open GND GND Open Open Open 2.70 Open GND GND Open Open GND
1.15 GND GND GND Open Open Open 2.75 GND GND GND Open Open GND
1.20 Open Open Open GND Open Open 2.80 Open Open Open GND Open GND
1.25 GND Open Open GND Open Open 2.85 GND Open Open GND Open GND
1.30 Open GND Open GND Open Open 2.90 Open GND Open GND Open GND
1.35 GND GND Open GND Open Open 2.95 GND GND Open GND Open GND
1.40 Open Open GND GND Open Open 3.00 Open Open GND GND Open GND
1.45 GND Open GND GND Open Open 3.05 GND Open GND GND Open GND
1.50 Open GND GND GND Open Open 3.10 Open GND GND GND Open GND
1.55 GND GND GND GND Open Open 3.15 GND GND GND GND Open GND
1.60 Open Open Open Open GND Open 3.20 Open Open Open Open GND GND
1.65 GND Open Open Open GND Open 3.25 GND Open Open Open GND GND
1.70 Open GND Open Open GND Open 3.30 Open GND Open Open GND GND
1.75 GND GND Open Open GND Open 3.35 GND GND Open Open GND GND
1.80 Open Open GND Open GND Open 3.40 Open Open GND Open GND GND
1.85 GND Open GND Open GND Open 3.45 GND Open GND Open GND GND
1.90 Open GND GND Open GND Open 3.50 Open GND GND Open GND GND
1.95 GND GND GND Open GND Open 3.55 GND GND GND Open GND GND
2.00 Open Open Open GND GND Open 3.60 Open Open Open GND GND GND
2.05 GND Open Open GND GND Open 3.65 GND Open Open GND GND GND
2.10 Open GND Open GND GND Open 3.70 Open GND Open GND GND GND
2.15 GND GND Open GND GND Open 3.75 GND GND Open GND GND GND
2.20 Open Open GND GND GND Open 3.80 Open Open GND GND GND GND
2.25 GND Open GND GND GND Open 3.85 GND Open GND GND GND GND
2.30 Open GND GND GND GND Open 3.90 Open GND GND GND GND GND
2.35 GND GND GND GND GND Open 3.95 GND GND GND GND GND GND
Table 8-5 TPS7A8401A User-Configurable Output Voltage Settings
VOUT(NOM)
(V)		 25mV 50mV 100mV 200mV 400mV 800mV VOUT(NOM)
(V)		 25mV 50mV 100mV 200mV 400mV 800mV
0.500 Open Open Open Open Open Open 1.300 Open Open Open Open Open GND
0.525 GND Open Open Open Open Open 1.325 GND Open Open Open Open GND
0.550 Open GND Open Open Open Open 1.350 Open GND Open Open Open GND
0.575 GND GND Open Open Open Open 1.375 GND GND Open Open Open GND
0.600 Open Open GND Open Open Open 1.400 Open Open GND Open Open GND
0.625 GND Open GND Open Open Open 1.425 GND Open GND Open Open GND
0.650 Open GND GND Open Open Open 1.450 Open GND GND Open Open GND
0.675 GND GND GND Open Open Open 1.475 GND GND GND Open Open GND
0.700 Open Open Open GND Open Open 1.500 Open Open Open GND Open GND
0.725 GND Open Open GND Open Open 1.525 GND Open Open GND Open GND
0.750 Open GND Open GND Open Open 1.550 Open GND Open GND Open GND
0.775 GND GND Open GND Open Open 1.575 GND GND Open GND Open GND
0.800 Open Open GND GND Open Open 1.600 Open Open GND GND Open GND
0.825 GND Open GND GND Open Open 1.625 GND Open GND GND Open GND
0.850 Open GND GND GND Open Open 1.650 Open GND GND GND Open GND
0.875 GND GND GND GND Open Open 1.675 GND GND GND GND Open GND
0.900 Open Open Open Open GND Open 1.700 Open Open Open Open GND GND
0.925 GND Open Open Open GND Open 1.725 GND Open Open Open GND GND
0.950 Open GND Open Open GND Open 1.750 Open GND Open Open GND GND
0.975 GND GND Open Open GND Open 1.775 GND GND Open Open GND GND
1.000 Open Open GND Open GND Open 1.800 Open Open GND Open GND GND
1.025 GND Open GND Open GND Open 1.825 GND Open GND Open GND GND
1.050 Open GND GND Open GND Open 1.850 Open GND GND Open GND GND
1.075 GND GND GND Open GND Open 1.875 GND GND GND Open GND GND
1.100 Open Open Open GND GND Open 1.900 Open Open Open GND GND GND
1.125 GND Open Open GND GND Open 1.925 GND Open Open GND GND GND
1.150 Open GND Open GND GND Open 1.950 Open GND Open GND GND GND
1.175 GND GND Open GND GND Open 1.975 GND GND Open GND GND GND
1.200 Open Open GND GND GND Open 2.000 Open Open GND GND GND GND
1.225 GND Open GND GND GND Open 2.025 GND Open GND GND GND GND
1.250 Open GND GND GND GND Open 2.050 Open GND GND GND GND GND
1.275 GND GND GND GND GND Open 2.075 GND GND GND GND GND GND