TPS51124_15 Datasheet, PDF (2/28 Pages) Texas Instruments – TPS51124 Dual Synchronous Step-Down Controller for Low-Voltage Power Rails

TPS51124
SLVS616C – NOVEMBER 2005 – REVISED DECEMBER 2014
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Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings .................................... 4
6.2 Recommended Operating Conditions...................... 4
6.3 Thermal Information .................................................. 4
6.4 Electrical Characteristics.......................................... 5
6.5 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Application .................................................. 14
9 Power Supply Recommendations...................... 18
10 Layout................................................................... 18
10.1 Layout Guidelines ................................................. 18
10.2 Layout Example .................................................... 19
11 Device and Documentation Support ................. 20
11.1 Third-Party Products Disclaimer ........................... 20
11.2 Trademarks ........................................................... 20
11.3 Electrostatic Discharge Caution ............................ 20
11.4 Glossary ................................................................ 20
12 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
Changes from Revision B (September 2010) to Revision C
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
Changes from Revision A (November 2005) to Revision B
Page
• Changed From: pin 48 = PGND1 To: pin 18 = PGND1 in the Pin Out illustration................................................................. 3
• Updated the Function Block Diagram................................................................................................................................... 10
• Figure 19 - Removed the hysteretic symbol from the PWM component.............................................................................. 15
• Updated equation 9. Changed From: V_OUT x 0.01 To: V_OUT x 0.0132.................................................................................. 16
Changes from Original (November 2005) to Revision A
Page
• Updated the the circut illustration, Pin 21 changed From DRVL1 To: DRVH1 and Pin 19 changed From: DRVH1 to
DRVL1 .................................................................................................................................................................................... 1
• PG low hysteresis (PGOODx goes low) - deleted the Min -4% and Max -6% values ........................................................... 6
• PG high hysteresis (PGOODx goes low) - deleted the Min 4% and Max 6% values ............................................................ 6
• Hysteresis (recovery < 20 μs) - deleted the Min 8% and Max 12% values ........................................................................... 6
• Updated Figure 18, Pin 21 changed From DRVL1 To: DRVH1 and Pin 19 changed From: DRVH1 to DRVL1 ................. 14
2
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