Datasheet LM2734 (Texas Instruments) - 3

LM2734 www.ti.com
SNVS288J – SEPTEMBER 2004 – REVISED DECEMBER 2014
5 Pin Configuration and Functions See Package Number DDC (R-PDSO-G6) 6-Lead SOT Top View
BOOST 1 6 SW GND 2 5 VIN FB 3 4 EN
Pin Functions PIN I/O DESCRIPTION NAME NO.
Boost voltage that drives the internal NMOS control switch. A bootstrap capacitor is BOOST 1 I connected between the BOOST and SW pins. Signal and Power ground pin. Place the bottom resistor of the feedback network as close as GND 2 GND possible to this pin for accurate regulation. FB 3 I Feedback pin. Connect FB to the external resistor divider to set output voltage. Enable control input. Logic high enables operation. Do not allow this pin to float or be greater EN 4 I than VIN + 0.3 V. VIN 5 I Input supply voltage. Connect a bypass capacitor to this pin. SW 6 O Output switch. Connects to the inductor, catch diode, and bootstrap capacitor. Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM2734 Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics 6.6 Typical Performance Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Output Overvoltage Protection 7.3.2 Undervoltage Lockout 7.3.3 Current Limit 7.3.4 Thermal Shutdown 7.4 Device Functional Modes 7.4.1 Enable Pin / Shutdown Mode 7.4.2 Soft-Start 8 Application and Implementation 8.1 Application Information 8.1.1 Boost Function 8.2 Typical Applications 8.2.1 LM2734X (1.6 MHz) VBOOST Derived from VIN 5V to 1.5 V/1 A 8.2.1.1 Design Requirements 8.2.1.2 Detailed Design Procedure 8.2.1.3 Application Curves 8.2.2 LM2734X (1.6 MHz) VBOOST Derived from VOUT 12 V to 3.3 V /1 A 8.2.2.1 Design Requirements 8.2.2.2 Detailed Design Procedure 8.2.2.3 Application Curves 8.2.3 LM2734X (1.6 MHz) VBOOST Derived from VSHUNT 18 V to 1.5 V /1 A 8.2.3.1 Design Requirements 8.2.3.2 Detailed Design Procedure 8.2.3.3 Application Curves 8.2.4 LM2734X (1.6 MHz) VBOOST Derived from Series Zener Diode (VIN) 15 V to 1.5 V / 1 A 8.2.4.1 Design Requirements 8.2.4.2 Detailed Design Procedure 8.2.4.3 Application Curves 8.2.5 LM2734X (1.6 MHz) VBOOST Derived from Series Zener Diode (VOUT) 15 V to 9 V /1 A 8.2.5.1 Design Requirements 8.2.5.2 Detailed Design Procedure 8.2.5.3 Application Curves 8.2.6 LM2734Y (550 kHz) VBOOST Derived from VIN 5 V to 1.5 V / 1 A 8.2.6.1 Design Requirements 8.2.6.2 Detailed Design Procedure 8.2.6.3 Application Curves 8.2.7 LM2734Y (550 kHz) VBOOST Derived from VOUT 12 V to 3.3 V / 1 A 8.2.7.1 Design Requirements 8.2.7.2 Detailed Design Procedure 8.2.7.3 Application Curves 8.2.8 LM2734Y (550 kHz) VBOOST Derived from VSHUNT 18 V to 1.5 V / 1 A 8.2.8.1 Design Requirements 8.2.8.2 Detailed Design Procedure 8.2.8.3 Application Curves 8.2.9 LM2734Y (550 kHz) VBOOST Derived from Series Zener Diode (VIN) 15 V to 1.5 V / 1 A 8.2.9.1 Design Requirements 8.2.9.2 Detailed Design Procedure 8.2.9.3 Application Curves 8.2.10 LM2734Y (550 kHz) VBOOST Derived from Series Zener Diode (VOUT) 15 V to 9 V / 1 A 8.2.10.1 Design Requirements 8.2.10.2 Detailed Design Procedure 8.2.10.3 Application Curves 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 11 Device and Documentation Support 11.1 Third-Party Products Disclaimer 11.2 Trademarks 11.3 Electrostatic Discharge Caution 11.4 Glossary 12 Mechanical, Packaging, and Orderable Information