SBVS066T December   2005  – April 2025 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 Diagrams
    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 and RGR Package,5mm × 5mm and 3.5mm × 3.5mm, 20-Pin VQFN(Top View)Figure 4-1 RGW and RGR Package,5mm × 5mm and 3.5mm × 3.5mm, 20-Pin VQFN(Top View)
TPS74401 KTW Package,7-Pin DDPAK(Top View)Figure 4-2 KTW Package,7-Pin DDPAK(Top View)
Table 4-1 Pin Functions
PIN I/O DESCRIPTION
NAME KTW RGW, RGR
BIAS 6 10 I Bias 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.
EN 7 11 I Enable 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.
FB 2 16 I This 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.
GND 4 12 — Ground
IN 5 5–8 I Unregulated input to the device.
An input capacitor of 1µF or greater is recommended for best performance.
NC N/A 2–4, 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.
OUT 3 1, 18–20 O Regulated 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.
PG N/A 9 O Power-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.
SS 1 15 — 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.