LM2681M6X National Semiconductor, LM2681M6X Datasheet

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LM2681M6X

Manufacturer Part Number
LM2681M6X
Description
IC CONVERTER SWITCH CAP SOT23-6
Manufacturer
National Semiconductor
Type
Switched Capacitor (Charge Pump), Divider, Doublerr
Datasheet

Specifications of LM2681M6X

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.8 ~ 11 V
Current - Output
20mA
Frequency - Switching
80kHz
Voltage - Input
2.5 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-6
Power - Output
600mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
LM2681M6XTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2681M6X
Manufacturer:
NS/国半
Quantity:
20 000
© 2003 National Semiconductor Corporation
LM2681
Switched Capacitor Voltage Converter
General Description
The LM2681 CMOS charge-pump voltage converter oper-
ates as a voltage doubler for an input voltage in the range of
+2.5V to +5.5V. Two low cost capacitors and a diode
(needed during start-up) is used in this circuit to provide up
to 20 mA of output current. The LM2681 can also work as a
voltage divider to split a voltage in the range of +1.8V to
+11V in half.
The LM2681 operates at 160 kHz oscillator frequency to
reduce output resistance and voltage ripple. With an operat-
ing current of only 550 µA (operating efficiency greater than
90% with most loads) the LM2681 provides ideal perfor-
mance for battery powered systems. The device is in SOT-
23-6 package.
Basic Application Circuits
DS100965
Splitting V
Voltage Doubler
in
Features
n Doubles or Splits Input Supply Voltage
n SOT23-6 Package
n 15Ω Typical Output Impedance
n 90% Typical Conversion Efficiency at 20 mA
Applications
n Cellular Phones
n Pagers
n PDAs
n Operational Amplifier Power Suppliers
n Interface Power Suppliers
n Handheld Instruments
in Half
10096501
10096502
January 2003
www.national.com

Related parts for LM2681M6X

LM2681M6X Summary of contents

Page 1

... LM2681 provides ideal perfor- mance for battery powered systems. The device is in SOT- 23-6 package. Basic Application Circuits © 2003 National Semiconductor Corporation Features n Doubles or Splits Input Supply Voltage n SOT23-6 Package n 15Ω Typical Output Impedance ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications GND Voltage: OUT to GND Voltage: OUT to V+ Voltage: V+ and OUT Continuous Output Current Output Short-Circuit Duration to GND (Note 2) Continuous Power Dissipation (T = 25˚ ...

Page 3

Test Circuit Typical Performance Characteristics Supply Current vs Supply Voltage Output Source Resistance vs Supply Voltage FIGURE 1. LM2681 Test Circuit (Circuit of Figure unless otherwise specified) 10096504 10096506 3 10096503 Supply Current vs Temperature 10096505 ...

Page 4

... Package Number LM2681M6 MA06A LM2681M6X MA06A Note 7: The first letter "S" identifies the part as a switched capacitor converter. The next two numbers are the device number. The fourth letter "A" indicates the grade. Only one grade is available. Larger quantity reels are available upon request. ...

Page 5

Pin Description Pin Name 1 V+ Power supply positive voltage input 2 GND Power supply ground input Connect this pin to the negative terminal of the 3 CAP− charge-pump capacitor 4 GND Power supply ground input 5 OUT Positive voltage ...

Page 6

Application Information CAPACITOR SELECTION As discussed in the Positive Voltage Doubler section, the output resistance and ripple voltage are dependent on the capacitance and ESR values of the external capacitors. The output voltage drop is the load current times the ...

Page 7

Other Applications (Continued) FIGURE 4. Increasing Output Voltage by Cascading Devices REGULATING V OUT It is possible to regulate the output of the LM2681 by use of a low dropout regulator (such as LP2980-5.0). The whole converter is depicted in ...

Page 8

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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