LM828M5 National Semiconductor, LM828M5 Datasheet

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LM828M5

Manufacturer Part Number
LM828M5
Description
IC SW CAP/INV ADJ 25MA SOT23-5
Manufacturer
National Semiconductor
Type
Switched Capacitor (Charge Pump), Invertingr
Datasheet

Specifications of LM828M5

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
-1.8 ~ -5.5 V
Current - Output
25mA
Frequency - Switching
12kHz
Voltage - Input
1.8 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Power - Output
240mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
LM828M5TR

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Price
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© 2010 National Semiconductor Corporation
Switched Capacitor Voltage Converter
General Description
The LM828 CMOS charge-pump voltage converter inverts a
positive voltage in the range of +1.8V to +5.5V to the corre-
sponding negative voltage of −1.8V to −5.5V. The LM828
uses two low cost capacitors to provide up to 25 mA of output
current.
The LM828 operates at 12 kHz switching frequency to reduce
output resistance and voltage ripple. With an operating cur-
rent of only 40 µA (operating efficiency greater than 96% with
most loads), the LM828 provides ideal performance for bat-
tery powered systems. The device is in a tiny SOT-23-5
package.
Basic Application Circuits
100137
+5V to −10V Converter
Voltage Inverter
LM828
Features
Applications
Inverts Input Supply Voltage
SOT-23-5 Package
20Ω Typical Output Impedance
97% Typical Conversion Efficiency at 5 mA
Cellular Phones
Pagers
PDAs
Operational Amplifier Power Supplies
Interface Power Supplies
Handheld Instruments
10013701
March 3, 2010
www.national.com
10013702

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LM828M5 Summary of contents

Page 1

... LM828 provides ideal performance for bat- tery powered systems. The device tiny SOT-23-5 package. Basic Application Circuits © 2010 National Semiconductor Corporation LM828 Features ■ Inverts Input Supply Voltage ■ ...

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) V+ and OUT Continuous Output Current Output Short-Circuit Duration to GND (Note 2) Continuous Power Dissipation (T = 25°C)(Note ...

Page 3

Test Circuit *C and C are 10 µF capacitors Typical Performance Characteristics Supply Current vs Supply Voltage Output Source Resistance vs Supply Voltage FIGURE 1. LM828 Test Circuit (Circuit of Figure unless otherwise specified) ...

Page 4

Output Voltage vs Load Current Switching Frequency vs Supply Voltage Connection Diagrams 5-Lead Small Outline Package (M5) Top View With Package Marking www.national.com 10013733 10013735 10013713 4 Efficiency vs Load Current 10013734 Switching Frequency vs Temperature 10013736 10013714 Actual Size ...

Page 5

... Order Number Package Number LM828M5 MA05B LM828M5X MA05B Note 8: The first letter "S" identifies the part as a switched capacitor converter. The next two numbers are the device number. Larger quantity reels are available upon request. Note 9: Pin 1 orientation is in quadrant Q2 as per Figure 2 above. ...

Page 6

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

Page 7

Manufacturer Nichicon Corp. (708)-843-7500 AVX Corp. (803)-448-9411 Sprague (207)-324-4140 Sanyo (619)-661-6835 Murata (800)-831-9172 Taiyo Yuden (800)-348-2496 Tokin (408)-432-8020 Other Applications PARALLELING DEVICES Any number of LM828s can be paralleled to reduce the output resistance. Each device must have its own ...

Page 8

FIGURE 5. Increasing Output Voltage by Cascading Devices COMBINED DOUBLER AND INVERTER In Figure 5, the LM828 is used to provide a positive voltage doubler and a negative voltage converter. Note that the total current drawn from the two outputs ...

Page 9

FIGURE 7. Combining LM828 with LP2980 to Make a Negative Adjustable Regulator 9 10013712 www.national.com ...

Page 10

Physical Dimensions For Order Numbers, refer to the table in the "Ordering Information" section of this document. www.national.com inches (millimeters) unless otherwise noted 5-Lead Small Outline Package (M5) NS Package Number MF05A 10 ...

Page 11

Notes 11 www.national.com ...

Page 12

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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