LM2698_15 Datasheet, PDF (1/25 Pages) Texas Instruments – LM2698 SIMPLE SWITCHER® 1.35A Boost Regulator

LM2698
www.ti.com
SNVS153E – MAY 2001 – REVISED APRIL 2013
LM2698 SIMPLE SWITCHER^® 1.35A Boost Regulator
Check for Samples: LM2698
FEATURES
1
•23 1.9A, 0.2Ω, Internal Switch (typical)
• Operating Voltage as Low as 2.2V
• 600kHz/1.25MHz Adjustable Frequency
Operation
• Switchers Made Simple® Software
• 8-Lead VSSOP package
APPLICATIONS
• 3.3V to 5V, 5V to 12V Conversion
• Distributed Power
• Set-Top Boxes
• DSL Modems
• Diagnostic Medical Instrumentation
• Boost Converters
• Flyback Converters
• SEPIC Converters
DESCRIPTION
The LM2698 is a general purpose PWM boost
converter. The 1.9A, 18V, 0.2ohm internal switch
enables the LM2698 to provide efficient power
conversion to outputs ranging from 2.2V to 17V. It
can operate with input voltages as low as 2.2V and
as high as 12V. Current-mode architecture provides
superior line and load regulation and simple
frequency compensation over the device's 2.2V to
12V input voltage range. The LM2698 sets the
standard in power density and is capable of supplying
12V at 400mA from a 5V input. The LM2698 can also
be used in flyback or SEPIC topologies.
The LM2698 SIMPLE SWITCHER^® features a pin
selectable switching frequency of either 600kHz or
1.25MHz. This promotes flexibility in component
selection and filtering techniques. A shutdown pin is
available to suspend the device and decrease the
quiescent current to 5µA. 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-lead VSSOP
(DGK) package.
Typical Application Circuit
L
10PH
D
4.5V-5.5V
Battery or Power
Source
5
6
VIN
3
SHDN
SW
LM2698
FSLCT
7
FB ²
VC
GND
1
4
CIN
22PF, 10V
RC
24.9k
RFB1
30.1k
12V
400mA
RFB2
3.48k
COUT
10PF
CC
4.7 nF
CIN: LMK316F226Z (TAIYO YUDEN)
COUT: EMK325B5106K (TAIYO YUDEN)
L: DO3316-103 (COILCRAFT)
D: 0MQ040N (MOTOROLA)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SIMPLE SWITCHER is a registered trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2013, Texas Instruments Incorporated