LM2661/3/4EVAL National Semiconductor, LM2661/3/4EVAL Datasheet

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LM2661/3/4EVAL

Manufacturer Part Number
LM2661/3/4EVAL
Description
EVALUATION BOARD FOR LM2661/3/4
Manufacturer
National Semiconductor
Datasheets

Specifications of LM2661/3/4EVAL

Main Purpose
DC/DC, Negative Inverter or Voltage Doubler
Outputs And Type
3, Non-Isolated
Voltage - Input
1.5 ~ 5.5V
Regulator Topology
Boost, Inverting
Board Type
Fully Populated
Utilized Ic / Part
LM2661, LM2663, LM2664
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Voltage - Output
-
Power - Output
-
Frequency - Switching
-
Other names
*LM2661/3/4EVAL
© 2005 National Semiconductor Corporation
LM2664
Switched Capacitor Voltage Converter
General Description
The LM2664 CMOS charge-pump voltage converter inverts
a positive voltage in the range of +1.8V to +5.5V to the
corresponding negative voltage of −1.8V to −5.5V. The
LM2664 uses two low cost capacitors to provide up to 40 mA
of output current.
The LM2664 operates at 160 kHz oscillator frequency to
reduce output resistance and voltage ripple. With an operat-
ing current of only 220 µA (operating efficiency greater than
91% with most loads) and 1 µA typical shutdown current, the
LM2664 provides ideal performance for battery powered
systems. The device is in SOT-23-6 package.
Basic Application Circuits
DS100031
+5V to −10V Converter
Voltage Inverter
Features
n Inverts Input Supply Voltage
n SOT23-6 Package
n 12Ω Typical Output Impedance
n 91% Typical Conversion Efficiency at 40 mA
n 1µA Typical Shutdown Current
Applications
n Cellular Phones
n Pagers
n PDAs
n Operational Amplifier Power Suppliers
n Interface Power Suppliers
n Handheld Instruments
10003101
10003125
September 2005
www.national.com

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LM2661/3/4EVAL Summary of contents

Page 1

... LM2664 provides ideal performance for battery powered systems. The device is in SOT-23-6 package. Basic Application Circuits © 2005 National Semiconductor Corporation Features n Inverts Input Supply Voltage n SOT23-6 Package n 12Ω Typical Output Impedance n 91% Typical Conversion Efficiency 1µ ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V+ to GND, or GND to OUT and OUT Continuous Output Current Output Short-Circuit Duration to GND (Note 2) Continuous Power Dissipation (T = 25˚C)(Note 3) ...

Page 3

Test Circuit *C and C are 3.3 µF, SC series OS-CON capacitors Typical Performance Characteristics (Circuit of Figure unless otherwise specified) Supply Current vs Supply Voltage Output Source Resistance vs Supply Voltage FIGURE 1. ...

Page 4

Typical Performance Characteristics (Continued) Output Voltage Drop vs Load Current Oscillator Frequency vs Supply Voltage Shutdown Supply Current vs Temperature www.national.com (Circuit of Figure unless otherwise specified) 10003116 Oscillator Frequency vs 10003118 10003120 4 Efficiency vs ...

Page 5

Connection Diagrams 6-Lead Small Outline Package (M6) 10003104 Top View With Package Marking Ordering Information Order Number Package Number LM2664M6 MA06A LM2664M6X MA06A Note 11: The first letter "S" identifies the part as a switched capacitor converter. The next two ...

Page 6

Application Information SIMPLE NEGATIVE VOLTAGE CONVERTER The main application of LM2664 is to generate a negative supply voltage. The voltage inverter circuit uses only two external capacitors as shown in the Basic Application Cir- cuits. The range of the input ...

Page 7

Other Applications PARALLELING DEVICES Any number of LM2664s can be paralleled to reduce the output resistance. Each device must have its own pumping capacitor C , while only one output capacitor shown in Figure 3. The composite ...

Page 8

Other Applications (Continued) REGULATING V OUT It is possible to regulate the negative output of the LM2664 by use of a low dropout regulator (such as LP2980). The whole converter is depicted in Figure 6. This converter can give a ...

Page 9

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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