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LM26981 Datasheet

35-A Boost Regulator

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LM2698
SNVS153F – MAY 2001 – REVISED SEPTEMBER 2016
LM2698 SIMPLE SWITCHER® 1.35-A Boost Regulator
1 Features
1 1.9-A, 0.2-Ω Internal Switch (Typical)
• Operating Voltage as Low as 2.2 V
• 600 kHz to 1.25 MHz Adjustable Frequency
Operation
• Switchers Made Simple® Software
• 8-Pin VSSOP Package
2 Applications
• 3.3 V to 5 V and 5 V to 12 V Conversion
• Distributed Power
• Set-Top Boxes
• DSL Modems
• Diagnostic Medical Instrumentation
• Boost Converters
• Flyback Converters
• SEPIC Converters
3 Description
The LM2698 device is a general purpose PWM boost
converter. The 1.9-A, 18-V, 0.2-Ω internal switch
enables the LM2698 to provide efficient power
conversion to outputs ranging from 2.2 V to 17 V. It
can operate with input voltages as low as 2.2 V and
as high as 12 V. Current-mode architecture provides
superior line and load regulation and simple
frequency compensation over the device's 2.2 V to
12 V input voltage range. The LM2698 sets the
standard in power density and is capable of supplying
12 V at 400 mA from a 5-V input. The LM2698 can
also be used in flyback or SEPIC topologies.
The LM2698 SIMPLE SWITCHER® features a pin
selectable switching frequency of either 600 kHz or
1.25 MHz. This promotes flexibility in component
selection and filtering techniques. A shutdown pin is
available to suspend the device and decrease the
quiescent current to 5 µA. An external compensation
pin gives the user flexibility in setting frequency
compensation, which makes possible the use of
small, low-ESR ceramic capacitors at the output.
Switchers Made Simple® software is available to
ensure a quick, easy, and assured design. The
LM2698 is available in a low-profile, 8-pin VSSOP
(DGK) package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2698
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4.5V-5.5V
Typical Application Circuit
L
10PH
D
Battery or
Power Source
5
6 VIN
3 SHDN
SW
FSLCT 7
LM2698
FB 2
VC
GND
1
4
CIN
22PF, 10V
RC
24.9k
CC
4.7 nF
RFB1
30.1k
12V
400mA
RFB2
3.48k
COUT
10PF
CIN: LMK316F226Z (TAIYO YUDEN)
COUT: EMK325B5106K (TAIYO YUDEN)
L: DO3316-103 (COILCRAFT)
D: 0MQ040N (MOTOROLA)
Copyright © 2016, Texas Instruments Incorporated
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.




etcTI

LM26981 Datasheet Preview

LM26981 Datasheet

35-A Boost Regulator

No Preview Available !

LM2698
SNVS153F – MAY 2001 – REVISED SEPTEMBER 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 .............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview .................................................................. 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Modes........................................ 12
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Applications ................................................ 14
9 Power Supply Recommendations...................... 22
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Examples................................................... 22
11 Device and Documentation Support ................. 24
11.1 Receiving Notification of Documentation Updates 24
11.2 Community Resources.......................................... 24
11.3 Trademarks ........................................................... 24
11.4 Electrostatic Discharge Caution ............................ 24
11.5 Glossary ................................................................ 24
12 Mechanical, Packaging, and Orderable
Information ........................................................... 24
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, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
• Deleted Ordering Information table, see POA at the end of the datasheet. .......................................................................... 1
• Changed values in the Thermal Information table to align with JEDEC standards................................................................ 5
Changes from Revision D (April 2013) to Revision E
Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................... 1
2
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Copyright © 2001–2016, Texas Instruments Incorporated


Part Number LM26981
Description 35-A Boost Regulator
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LM26981 Datasheet PDF






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