LM2734Z Regulator Datasheet

LM2734Z Datasheet, PDF, Equivalent


Part Number

LM2734Z

Description

Thin SOT 1-A Load Step-Down DC-DC Regulator

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM2734Z
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LM2734Z, LM2734Z-Q1
SNVS334F – JANUARY 2005 – REVISED JANUARY 2016
LM2734Z/-Q1 Thin SOT 1-A Load Step-Down DC-DC Regulator
1 Features
1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C6
• 6-pin SOT Package, or 6-Pin WSON Package
• 3.0-V to 20-V Input Voltage Range
• 0.8-V to 18-V Output Voltage Range
• 1-A Output Current
• 3-MHz Switching Frequency
• 300-mNMOS Switch
• 30-nA Shutdown Current
• 0.8-V, 2% Internal Voltage Reference
• Internal Soft-Start
• Current-Mode, PWM Operation
• Thermal Shutdown
2 Applications
• DSL Modems
• Local Point of Load Regulation
• Battery-Powered Devices
• USB-Powered Devices
• Automotive
Typical Application Circuit
3 Description
The LM2734Z regulator is a monolithic, high-
frequency, PWM step-down DC–DC converter
assembled in a thick 6-pin SOT and a WSON non-
pullback package. The device provides all the active
functions to provide local DC–DC conversion with fast
transient response and accurate regulation in the
smallest possible PCB area.
With a minimum of external components and online
design support through WEBENCH™, the LM2734Z
is easy to use. The ability to drive 1-A loads with an
internal 300-mNMOS switch using state-of-the-art
0.5-µm BiCMOS technology results in the best power
density available. The world class control circuitry
allows for ON-times as low as 13 ns, thus supporting
exceptionally high-frequency conversion over the
entire 3-V to 20-V input operating range down to the
minimum output voltage of 0.8 V. Switching frequency
is internally set to 3 MHz, allowing the use of
extremely small surface mount inductors and chip
capacitors. Even though the operating frequency is
very high, efficiencies up to 85% are easy to achieve.
External shutdown is included, featuring an ultra-low
standby current of 30 nA. The LM2734Z uses current-
mode control and internal compensation to provide
high-performance regulation over a wide range of
operating conditions. Additional features include
internal soft-start circuitry to reduce inrush current,
pulse-by-pulse current limit, thermal shutdown, and
output overvoltage protection.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2734Z
WSON (6)
SOT (6)
3.00 mm × 3.00 mm
1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load Current
VIN
C1
ON
OFF
VIN BOOST
LM2734
SW
EN
D2
C3
D1
FB
GND
L1
VOUT
C2
R1
R2
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM2734Z
LM2734Z, LM2734Z-Q1
SNVS334F – JANUARY 2005 – REVISED JANUARY 2016
www.ti.com
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 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 7
7.1 Overview ................................................................... 7
7.2 Functional Block Diagram ......................................... 7
7.3 Feature Description................................................... 7
7.4 Device Functional Modes........................................ 11
8 Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Applications ................................................ 12
9 Power Supply Recommendations...................... 26
10 Layout................................................................... 26
10.1 Layout Guidelines ................................................. 26
10.2 Layout Examples................................................... 27
11 Device and Documentation Support ................. 28
11.1 Device Support...................................................... 28
11.2 Documentation Support ........................................ 28
11.3 Community Resources.......................................... 28
11.4 Trademarks ........................................................... 28
11.5 Electrostatic Discharge Caution ............................ 28
11.6 Glossary ................................................................ 28
12 Mechanical, Packaging, and Orderable
Information ........................................................... 28
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (April 2013) to Revision F
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes section, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section................................................................ 1
• Removed soldering information ............................................................................................................................................. 4
Changes from Revision D (April 2013) to Revision E
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 25
2 Submit Documentation Feedback
Copyright © 2005–2016, Texas Instruments Incorporated
Product Folder Links: LM2734Z LM2734Z-Q1


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM2734Z, LM2734Z-Q1 SNVS334F – JANUARY 2005 – REVISED JANUARY 2 016 LM2734Z/-Q1 Thin SOT 1-A Load Step- Down DC-DC Regulator 1 Features •1 Q ualified for Automotive Applications AEC-Q100 Qualified With the Following Results: – Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range – Device HBM ESD C lassification Level 2 – Device CDM ES D Classification Level C6 • 6-pin SOT Package, or 6-Pin WSON Package • 3.0 -V to 20-V Input Voltage Range • 0.8- V to 18-V Output Voltage Range • 1-A Output Current • 3-MHz Switching Freq uency • 300-mΩ NMOS Switch • 30-n A Shutdown Current • 0.8-V, 2% Intern al Voltage Reference • Internal Soft- Start • Current-Mode, PWM Operation Thermal Shutdown 2 Applications • DSL Modems • Local Point of Load Regu lation • Battery-Powered Devices • USB-Powered Devices • Automotive Typical Application Circuit 3 Description The LM2734Z regulator is a monolithic.
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