SBVS066S December   2005  – November 2024 TPS74401

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Enable, Shutdown
      2. 6.3.2 Power-Good (VQFN Package Only)
      3. 6.3.3 Internal Current Limit
      4. 6.3.4 Thermal Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Dropout Operation
      3. 6.4.3 Disabled
    5. 6.5 Programming
      1. 6.5.1 Programmable Soft-Start
      2. 6.5.2 Sequencing Requirements
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Input, Output, and Bias Capacitor Requirements
      2. 7.1.2 Transient Response
      3. 7.1.3 Dropout Voltage
      4. 7.1.4 Output Noise
    2. 7.2 Typical Applications
      1. 7.2.1 Setting the TPS74401
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Using an Auxiliary Bias Rail
      3. 7.2.3 Without an Auxiliary Bias
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Power Dissipation
        2. 7.4.1.2 Thermal Considerations
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
      2. 8.1.2 Device Nomenclature
    2. 8.2 Device Support
      1. 8.2.1 Development Support
        1. 8.2.1.1 Evaluation Modules
        2. 8.2.1.2 Spice Models
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

4 Pin Configuration and Functions

TPS74401 RGW, RGR Package5mm × 5mm and 3.5mm × 3.5mm, 20-Pin VQFNTop ViewFigure 4-1 RGW, RGR Package5mm × 5mm and 3.5mm × 3.5mm, 20-Pin VQFNTop View
TPS74401 KTW Package7-Pin DDPAKTop ViewFigure 4-2 KTW Package7-Pin DDPAKTop View
Table 4-1 Pin Functions
PINI/ODESCRIPTION
NAMEKTWRGW, RGR
BIAS610IBias input voltage for error amplifier, reference, and internal control circuits.
A 1µF or larger bias capacitor is recommended for best performance.
If IN is connected to BIAS, use a 4.7µF or larger capacitor.
EN711IEnable pin. Driving this pin high enables the regulator. Driving this pin low puts the regulator into shutdown mode. This pin must not be left floating.
FB216IThis pin is the feedback connection to the center tap of an external resistor divider network that sets the output voltage. This pin must not be left floating.
GND412—Ground
IN55–8IUnregulated input to the device.
An input capacitor of 1µF or greater is recommended for best performance.
NCN/A2–4, 13, 14, 17—No connection. This pin can be left floating or connected to GND to allow better thermal contact to the top-side plane.
OUT31, 18–20ORegulated output voltage. No capacitor is required on this pin for stability, but is recommended for excellent performance.
PAD/TAB———Must be soldered to the ground plane for increased thermal performance.
Internally connected to ground.
PGN/A9OPower-good (PG) is an open-drain, active-high output that indicates the status of VOUT. When VOUT exceeds the PG trip threshold, the PG pin goes into a high-impedance state. When VOUT is below this threshold, the pin is driven to a low-impedance state. Connect a pullup resistor from 10kΩ to 1MΩ from this pin to a supply up to 5.5V. The supply can be higher than the input voltage.
Alternatively, the PG pin can be left floating if output monitoring is not necessary.
SS115—Soft-start pin. A capacitor connected on this pin to ground sets the start-up time.
If this pin is left floating, the regulator output soft-start ramp time is typically 100µs.