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National Semiconductor Electronic Components Datasheet

LM2698 Datasheet

SIMPLE SWITCHER 1.35A Boost Regulator

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October 2001
LM2698
SIMPLE SWITCHER® 1.35A Boost Regulator
General 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 com-
pensation 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 pro-
motes flexibility in component selection and filtering tech-
niques. 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 fre-
quency compensation, which makes possible the use of
small, low ESR ceramic capacitors at the output. Switchers
Made Simple® software is available to insure a quick, easy
and guaranteed design. The LM2698 is available in a low
profile 8-lead MSOP package.
Features
n 1.9A, 0.2, internal switch (typical)
n Operating voltage as low as 2.2V
n 600kHz/1.25MHz adjustable frequency operation
n Switchers Made Simple® software
n 8-Lead MSOP package
Applications
n 3.3V to 5V, 5V to 12V conversion
n Distributed Power
n Set-Top Boxes
n DSL Modems
n Diagnostic Medical Instrumentation
n Boost Converters
n Flyback Converters
n SEPIC Converters
Typical Application Circuit
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
© 2001 National Semiconductor Corporation DS200126
20012658
www.national.com


National Semiconductor Electronic Components Datasheet

LM2698 Datasheet

SIMPLE SWITCHER 1.35A Boost Regulator

No Preview Available !

Connection Diagram
Top View
20012604
8-Lead Plastic MSOP
NS Package Number MUA08A
Ordering Information
Order Number
LM2698MM-ADJ
LM2698MMX-ADJ
Package Type
MSOP-8
MSOP-8
NSC Package
Drawing
MUA08A
MUA08A
Supplied As
1000 Units, Tape and Reel
3500 Units, Tape and Reel
Package ID
S22B
S22B
Pin Description
Pin Name
Function
1 VC Compensation network connection. Connected to the output of the voltage error amplifier.
2 FB Output voltage feedback input.
3
SHDN
Shutdown control input, active low.
4
GND
Analog and power ground.
5 VSW Power switch input. Switch connected between SW pin and GND pin.
6 VIN Analog power input.
7
FSLCT
Switching frequency select input. VIN= 1.25MHz. Ground = 600kHz.
8 NC Connect to ground.
www.national.com
2


Part Number LM2698
Description SIMPLE SWITCHER 1.35A Boost Regulator
Maker National Semiconductor
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LM2698 Datasheet PDF






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