SLVSDU9A February 2017  – March 2017


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Switching Characteristics
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Device Enable (EN)
      2. 7.3.2Adjustable Power-Good Threshold (PG, PGADJ)
      3. 7.3.3Adjustable Power-Good Delay Timer (DELAY)
      4. 7.3.4Undervoltage Shutdown
      5. 7.3.5Current Limit
      6. 7.3.6Thermal Shutdown
      7. 7.3.7Integrated Watchdog
        1. Watchdog (WTS, ROSC, FSEL and WRS)
        2. Watchdog (WTS, ROSC and FSEL)
        3. Service Signal and Watchdog Fault Outputs (WD and WDO)
        4. Status Detection (ROSC)
        5. Enable (PG and WD_EN)
        6. Initialization
        7. Watchdog Operation (WTS = Low)
        8. Watchdog Operation (WTS = High)
    4. 7.4Device Functional Modes
      1. 7.4.1Operation With Input Voltage Lower Than 4 V
      2. 7.4.2Operation With Input Voltage Higher Than 4 V
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        1. Capacitor
        2. Capacitor
        3. Threshold
        4. Delay Period
        5. Setup
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Related Documentation
    2. 11.2Related Links
    3. 11.3Receiving Notification of Documentation Updates
    4. 11.4Community Resources
    5. 11.5Trademarks
    6. 11.6Electrostatic Discharge Caution
    7. 11.7Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information

Pin Configuration and Functions

PWP PowerPAD™ Package
16-Pin HTSSOP With Exposed Thermal Pad
Top View
NC - No internal connection

Pin Functions

DELAY8OPower-good delay-period adjustment pin. Connect this pin via a capacitor to ground to adjust the power-good delay time.
EN2IDevice enable pin. Pull this pin down to low-level voltage to disable the device. Pull this pin up to high-level voltage to enable the device.
FSEL3IInternal oscillator-frequency selection pin. Pull this pin down to low-level voltage to select the high-frequency oscillator. Pull this pin up to high-level voltage to select the low-frequency oscillator.
GND5, 13Ground reference
IN 1 IDevice input power supply pin
NC6Not connected
OUT16ODevice 3.3-V or 5-V regulated output-voltage pin
PG14OPower-good pin. Open-drain output pin. Pull this pin up to VOUT or to a reference through a resistor. When the output voltage is not ready, this pin is pulled down to ground.
PGADJ15OPower-good threshold-adjustment pin. Connect a resistor divider between the PGADJ and OUT pins to set the power-good threshold. Connect this pin to ground to set the threshold to 91.6% of output voltage VOUT.
ROSC7OWatchdog timer adjustment pin. Connect a resistor between the ROSC pin and the GND pin to set the duration of the watchdog monitor. Leaving this pin open or connecting this pin to ground results in the watchdog reporting a fault at the watchdog output (WDO).
WD9IWatchdog service-signal input pin.
WDO10OWatchdog status pin. Open-drain output pin. Pull this pin up to OUT or a reference voltage through a resistor. When watchdog fault occurs, this pin is pulled down to a low-level voltage.
WD_EN11IWatchdog enable pin. Pull this pin down to a low level to enable the watchdog. Pull this pin up to a high level to disable the watchdog.
WRS12IWindow ratio-selection pin (only applicable for the window watchdog). Pull this pin down to a low level to set the open:closed window ratio to 1:1. Pull this pin up to high level to set the open:closed window ratio to 8:1.
WTS4OWatchdog type-selection pin. To set the window watchdog, connect this pin to the GND pin. To set the standard watchdog, pull this pin high.
Thermal padSolder to board to improve the thermal performance.