Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- OPERATING RATINGS
- ELECTRICAL CHARACTERISTICS
- TYPICAL PERFORMANCE CHARACTERISTICS
- BLOCK DIAGRAM
- OPERATION DESCRIPTION
- GENERAL
- PRECISION ENABLE
- PEAK CURRENT MODE CONTROL
- CURRENT LIMIT
- SOFT-START AND VOLTAGE TRACKING
- PRE-BIAS START UP CAPABILITY
- POWER GOOD AND OVER VOLTAGE FAULT HANDLING
- UVLO
- THERMAL PROTECTION
- LIGHT LOAD OPERATION
- Design Guide
- INDUCTOR SELECTION (L)
- OUTPUT CAPACITOR SELECTION (COUT)
- INPUT CAPACITOR SELECTION (CIN)
- SETTING THE OUTPUT VOLTAGE (RFB1, RFB2)
- LOOP COMPENSATION (RC1, CC1)
- AVIN FILTERING COMPONENTS (CF and RF)
- SUB-REGULATOR BYPASS CAPACITOR (CVCC)
- SETTING THE START UP TIME (CSS)
- USING PRECISION ENABLE AND POWER GOOD
- TRACKING AN EXTERNAL SUPPLY
- THERMAL CONSIDERATIONS
- PCB LAYOUT CONSIDERATIONS
- Typical Application Circuit
- Bill of Materials (VIN = 5V, VOUT = 3.3V, IOUTMAX = 3A)
- Bill of Materials (VIN = 3.3V to 5V, VOUT = 1.2V, IOUTMAX = 3A)
- Revision History
LM20123
www.ti.com
SNVS524E –OCTOBER 2007–REVISED MARCH 2013
REVISION HISTORY
Changes from Revision D (March 2013) to Revision E Page
• Changed layout of National Data Sheet to TI format .......................................................................................................... 22
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 23
Product Folder Links: LM20123