SLVS400D August   2001  – January 2015 TPS54611 , TPS54612 , TPS54613 , TPS54614 , TPS54615 , TPS54616

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 Recommended Operating Conditions
    3. 6.3 Thermal Information
    4. 6.4 Dissipation Ratings
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Undervoltage Lock Out (UVLO)
      2. 7.3.2  Slow-Start and Enable (SS/ENA)
      3. 7.3.3  VBIAS Regulator
      4. 7.3.4  Voltage Reference
      5. 7.3.5  Oscillator and PWM Ramp
      6. 7.3.6  Error Amplifier
      7. 7.3.7  PWM Control
      8. 7.3.8  Dead-Time Control and MOSFET Drivers
      9. 7.3.9  Overcurrent Protection
      10. 7.3.10 Thermal Shutdown
      11. 7.3.11 Powergood (PWRGD)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Continuous Conduction Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Component Selection
        2. 8.2.2.2 Input Filter
        3. 8.2.2.3 Feedback Circuit
        4. 8.2.2.4 Operating Frequency
        5. 8.2.2.5 Output Filter
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Related DC - DC Products
    2. 11.2 Related Links
    3. 11.3 Trademarks
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

5 Pin Configuration and Functions

TPS5461x PWP Package
28-Pin HTSSOP
Top View
pinout_SLVS400C.gif

Pin Functions

PIN TYPE(1) DESCRIPTION
NAME NO.
AGND 1 G Analog ground. Return for slow-start capacitor, VBIAS capacitor, RT resistor FSEL. Make PowerPAD connection to AGND.
BOOT 5 S Bootstrap input. 0.022-µF to 0.1-µF low-ESR capacitor connected from BOOT to PH generates floating drive for the high-set FET driver.
FSEL 27 I Frequency select input. Provides logic input to select between two internally set switching frequencies.
NC 3 – No connection
PGND 15−19 G Power ground. High current return for the low-side driver and power MOSFET. Connect PGND with large copper areas to the input and output supply returns, and negative terminals of the input and output capacitors.
PH 6−14 O Phase input/output. Junction of the internal high-side and low-side power MOSFETs, and output inductor.
PWRGD 4 O Powergood open-drain output. High-Z when VSENSE ≥ 90% Vref, otherwise PWRGD is low. Note that output is low when SS/ENA is low or internal shutdown signal active.
RT 28 I Frequency setting resistor input. Connect a resistor from RT to AGND to set the switching frequency.
SS/ENA 26 I Slow-start/enable input/output. Dual function pin which provides logic input to enable/disable device operation and capacitor input to externally set the start-up time.
VBIAS 25 S Internal bias regulator output. Supplies regulated voltage to internal circuitry. Bypass VBIAS pin to AGND pin with a high quality, low-ESR 0.1-µF to 1-µF ceramic capacitor.
VIN 20−24 I Input supply for the power MOSFET switches and internal bias regulator. Bypass VIN pins to PGND pins close to device package with a high quality, low-ESR 1-µF to 10-µF ceramic capacitor.
VSENSE 2 I Error amplifier inverting input. Connect directly to output voltage sense point.
(1) I = Input, O = Output, S = Supply, G = Ground