SNVSAZ4A February   2021  – March 2021 TPS541620

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
    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  Fixed-Frequency, Internally Compensated Advanced-Current-Mode Control
      2. 7.3.2  Enable and UVLO
      3. 7.3.3  Internal LDO
      4. 7.3.4  Pre-biased Output Start-up
      5. 7.3.5  Current Sharing
      6. 7.3.6  Frequency Selection and Minimum On-Time and Off-Time
      7. 7.3.7  Ramp Compensation Selection
      8. 7.3.8  Soft Start
      9. 7.3.9  Remote Sense Function
      10. 7.3.10 Adjustable Output Voltage
      11. 7.3.11 Power Good
      12. 7.3.12 Overcurrent Protection
      13. 7.3.13 Overvoltage and Undervoltage Protection
      14. 7.3.14 Overtemperature Protection
      15. 7.3.15 Frequency Synchronization
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application - Dual Independent Outputs
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Switching Frequency
        2. 8.2.2.2  Output Inductor Selection
        3. 8.2.2.3  Output Capacitor
        4. 8.2.2.4  Input Capacitor
        5. 8.2.2.5  Output Voltage Resistors Selection
        6. 8.2.2.6  Adjustable Undervoltage Lockout
        7. 8.2.2.7  Bootstrap Capacitor Selection
        8. 8.2.2.8  BP5 Capacitor Selection
        9. 8.2.2.9  PGOOD Pullup Resistor
        10. 8.2.2.10 Current Limit
        11. 8.2.2.11 Soft-Start Time Selection
        12. 8.2.2.12 MODE1 and MODE2 Pins
      3. 8.2.3 Application Curves
      4. 8.2.4 Typical Application - 2-Phase Operation
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
          1. 8.2.4.2.1  Switching Frequency
          2. 8.2.4.2.2  Output Inductor Selection
          3. 8.2.4.2.3  Output Capacitor
          4. 8.2.4.2.4  Input Capacitor
          5. 8.2.4.2.5  Output Voltage Resistors Selection
          6. 8.2.4.2.6  Adjustable Undervoltage Lockout
          7. 8.2.4.2.7  Bootstrap Capacitor Selection
          8. 8.2.4.2.8  BP5 Capacitor Selection
          9. 8.2.4.2.9  PGOOD Pullup Resistor
          10. 8.2.4.2.10 Current Limit
          11. 8.2.4.2.11 Soft-Start Time Selection
          12. 8.2.4.2.12 MODE1 Pin
        3. 8.2.4.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
      1. 10.2.1 Thermal Performance
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 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

GUID-63A3CB6F-26E4-4E61-B53A-6E6DE2871278-low.gif Figure 5-1 25-Pin VQFN-HRRPB Package(Top View)
Table 5-1 Pin Functions
PIN I/O/B/P(2) DESCRIPTION
NAME NO.
BOOT2 1 I Bootstrap pin for the internal flying high-side driver. Connect a typical 100-nF capacitor from this pin to SW2.
SW2 2 B Channel 2 power stage switch node. Connect this pin to the channel 2 output inductor.
PGND 3, 7, 23, 25 G Power stage ground return
SW1 4 B Channel 1 power stage switch node. Connect this pin to the channel 1 output inductor.
BOOT1 5 I Bootstrap pin for the internal flying high-side driver. Connect a typical 100-nF capacitor from this pin to SW1.
PVIN1 6 I Power conversion input. Bypass with capacitor from PVIN1 (pin 6) to PGND (pin 7).
SYNC 8 I Synchronizes to external clock. Tie to BP5 for internal switching frequency. Connect it to an external clock for frequency synchronization.
MODE1 9 I Pin strap set pin. Connect a resistor from this pin to GND to set supply configurations, dual independent outputs, primary/secondary, and clock delays.
MODE2 10 I Pin strap set pin. Select from four preselected switching frequencies, each with four settings of compensation.
NC1 11 — No internal connection
SS 12 O External soft start for multi-phase configuration only. Place a capacitor from SS to AGND to set output rise time. Float for dual-output configurations. Dual-output mode uses an internal soft start of 1 ms.
FB1 13 I Feedback input. Connect to the output voltage of channel 1 with a resistor divider for dual-output mode. For multi-phase configuration, FB1 is used for positive input of the remote sense amplifier.
GOSNS 14 I Connect to ground of the output capacitor as remote sense ground in multi-phase operation. In dual-output mode, simply ground this pin to PGND.
AGND 15 G Analog ground. Connect to PGND at one single point away from noisy circuitry.
BP5 16 I/O LDO output. Connect a 2.2-µF to 4.7-µF capacitor to PGND. BP5 must not be connected to an external load.
FB2/VSHARE 17 I/O Feedback input. Connect to the output voltage of channel 2 with a resistor divider for dual-output mode.
EN2/ISHARE(1) 18 I/O Enable high to power on. This pin can also be used to externally adjust EN UVLO by connecting a resistor divider between PVIN and AGND.
NC2 19 — No internal connection
EN1 20 I Enable high to power on. This pin can also be used to externally adjust EN UVLO by connecting a resistor divider between PVIN and AGND.
PGOOD2/CLKO 21 O Open-drain power-good indicator for channel 2 output
PGOOD1 22 O Open-drain power-good indicator for channel 1 output
PVIN2 24 I Power conversion input. Bypass with a capacitor from PVIN2 (pin 24) to PGND (pin 23).
(1) Pin 18 only uses one operating mode for its lifetime.
(2) I = Input, O = Output, B = Bidirectional, P = Supply, G = Ground