LM2735 Regulator Datasheet

LM2735 Datasheet, PDF, Equivalent


Part Number

LM2735

Description

520-kHz and 1.6-MHz Space-Efficient Boost and SEPIC DC/DC Regulator

Manufacture

etcTI

Total Page 30 Pages
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LM2735
SNVS485I – JUNE 2007 – REVISED SEPTEMBER 2018
LM2735 520-kHz and 1.6-MHz Space-Efficient Boost and SEPIC DC/DC Regulator
1 Features
1 Input Voltage Range: 2.7 V to 5.5 V
• Output Voltage Range: 3 V to 24 V
• 2.1-A Switch Current Over Full Temperature
Range
• Current-Mode Control
• Logic High Enable Pin
• Ultra-Low Standby Current of 80 nA in Shutdown
• 170-mNMOS Switch
• ±2% Feedback Voltage Accuracy
• Ease-of-Use, Small Total Solution Size
– Internal Soft Start
– Internal Compensation
– Two Switching Frequencies
– 520 kHz (LM2735-Y)
– 1.6 MHz (LM2735-X)
– Uses Small Surface Mount Inductors and Chip
Capacitors
– Tiny SOT-23, WSON, and MSOP-
PowerPAD™ Packages
• Create a Custom Design Using the LM2735 With
WEBENCH® Power Designer
2 Applications
• LCD Display Backlighting For Portable
Applications
• OLED Panel Power Supply
• USB-Powered Devices
• Digital Still and Video Cameras
• White LED Current Source
• For Automotive see LM2735-Q1
space
Typical Boost Application Circuit
VIN
2.7V-5.5V
L1
D1
12V
3 Description
The LM2735 device is an easy-to-use, space-efficient
2.1-A low-side switch regulator, ideal for Boost and
SEPIC DC/DC regulation. The device provides all the
active functions to provide local DC-DC conversion
with fast-transient response and accurate regulation
in the smallest PCB area. Switching frequency is
internally set to either 520 kHz or 1.6 MHz, allowing
the use of extremely small surface mount inductor
and chip capacitors, while providing efficiencies of up
to 90%. Current-mode control and internal
compensation provide ease-of-use, minimal
component count, and high-performance regulation
over a wide range of operating conditions. External
shutdown features an ultra-low standby current of 80
nA, ideal for portable applications. Tiny SOT-23,
WSON, and MSOP-PowerPAD packages provide
space savings. Additional features include internal
soft start, circuitry to reduce inrush current, pulse-by-
pulse current limit, and thermal shutdown.
PART NUMBER
LM2735
Device Information(1)
PACKAGE
BODY SIZE (NOM)
WSON (6)
3.00 mm × 3.00 mm
SOT-23 (5)
1.60 mm × 2.90 mm
MSOP PowerPAD (8) 3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load Current VO = 12 V
R3
4
5
3
2
1
R2 C3
C2
R1
C1
GND
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.

LM2735
LM2735
SNVS485I – JUNE 2007 – REVISED SEPTEMBER 2018
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: LM2735 .............................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ....................................... 11
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 14
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Applications ................................................ 14
9 Power Supply Recommendations...................... 37
10 Layout................................................................... 37
10.1 Layout Guidelines ................................................. 37
10.2 Layout Examples................................................... 38
10.3 Thermal Considerations ........................................ 39
11 Device and Documentation Support ................. 48
11.1 Device Support...................................................... 48
11.2 Documentation Support ........................................ 48
11.3 Community Resources.......................................... 48
11.4 Trademarks ........................................................... 48
11.5 Electrostatic Discharge Caution ............................ 48
11.6 Glossary ................................................................ 49
12 Mechanical, Packaging, and Orderable
Information ........................................................... 49
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision H (March 2018) to Revision I
Page
• Added bullet to Applications list regarding automotive device LM2735-Q1 .......................................................................... 1
Changes from Revision G (August 2015) to Revision H
Page
• Changed VFB Feedback Test Conditions from "TJ = –40°C to 125°C" To "TJ = 0°C to 125°C" for the SOT-23,
WSON, and MSOP-PowerPAD devices................................................................................................................................. 5
Changes from Revision F (April 2013) to Revision G
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 E (April 2013) to Revision F
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 33
2 Submit Documentation Feedback
Product Folder Links: LM2735
Copyright © 2007–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM2735 SNVS485I – JUNE 2007 REVISED SEPTEMBER 2018 LM2735 520-kH z and 1.6-MHz Space-Efficient Boost and SEPIC DC/DC Regulator 1 Features •1 Input Voltage Range: 2.7 V to 5.5 V Output Voltage Range: 3 V to 24 V • 2.1-A Switch Current Over Full Tempera ture Range • Current-Mode Control • Logic High Enable Pin • Ultra-Low St andby Current of 80 nA in Shutdown • 170-mΩ NMOS Switch • ±2% Feedback Voltage Accuracy • Ease-of-Use, Small Total Solution Size – Internal Soft Start – Internal Compensation – Two Switching Frequencies – 520 kHz (LM2 735-Y) – 1.6 MHz (LM2735-X) – Uses Small Surface Mount Inductors and Chip Capacitors – Tiny SOT-23, WSON, and M SOP- PowerPAD™ Packages • Create a Custom Design Using the LM2735 With WEB ENCH® Power Designer 2 Applications • LCD Display Backlighting For Portab le Applications • OLED Panel Power Supply • USB-Powered Devices • Digital Still and Video Cameras • White LED.
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